Search results

1

Visual Kerogen Study of the Campano-Maastrichtian Nkporo Group of Anambra Basin, Southeastern Nigeria

100%

Chiadikobi K. C., Chiaghanam O. I.

World News of Natural Sciences

|

2018

|

vol. 19

142-154

EN

In this work, phytoclasts, opaques, Amorphous Organic Matter (AOM) and palynomorphs of the Nkporo group underwent Visual Kerogen analysis. Herein, the average percent counts of phytoclasts are about 42.08%, opaques are about 34.54%, Amorphous Organic Matter (AOM) is about 16.34% and Palynomorphs are about 7.08%. The highest number of percent counts produced is found in the phytoclasts (the value of 42.08% indicating Type III kerogen and Gas Prone) and Amorphous Organic Matter (AOM) (the value of which - 34.54% - indicates Oil/Gas Prone). Thus, from the results of the visual kerogen, in the Nkporo Group, the source rock is of Type III kerogen, which is gas prone, and also Type II/III, which is Oil/Gas prone.

2

Dzieje kolekcji Neumannów

100%

Biała J.

Acta Societatis Metheoriticae Polonorum

|

2019

|

vol. 10

7-12

EN

The history of Neumann’s family collection of meteorites is presented here. It was formed by Karl August, Johann Georg and Wilhelm Max. Since 1997 this collection is in the Natural History Museum in Viena.

3

Nowe znaleziska mołdawitów w Polsce

100%

Szopa K.

Acta Societatis Metheoriticae Polonorum

|

2021

|

vol. 12

81-84

EN

Moldavites represent tektites derived from the Ries impact structure ca. 14 Ma. in southern Germany. Approximately 36 moldavite specimens from Poland have been reported since 2012. Characteristic moldavites features, especially bubbles and inclusions of lechatelierite, are reported in all found moldavites. Almost all of them are genetically connected with the Miocene Gozdnica Formation. Only two have been found in Pleistocene sediments, which are part of the Nysa Łużyca river terrace sediments. In 2020, four more moldavites have been collected from Poland. One specimen was found in Gozdnica village, and the other three in Jaroszów village, which is located ~10 km east of Strzegom. Numerous moldavites are generally found in Poland, widely distributed based on the distance from the Ries crater, exceeding 500 km, experimentally determined based on the transport mechanism. However, the lack of the autochthonous tektites indicates that tektites investigated up to now, had to be redeposited in a fluvial environment, probably from the Lusatian area as well as from the Czech Republic.

4

Reevesyt i jarosyt – nowe wtórne fazy w meteorycie Morasko

100%

Gurdziel A., Karwowski Ł.

Acta Societatis Metheoriticae Polonorum

|

2016

|

vol. 7

27-35

EN

Numerous investigations of Morasko meteorites, have so far identified many secondary mineral phases like: goethite, lepidocrocite, akaganeite, siderite, calcite, ankerite, awaruite, nickel native as well as vivianite. Recently studies on a new found meteorites Morasko, allowed the identification of more secondary minerals. They are represented by: aragonite CaCO3, chukanovite Fe2(CO3)(OH)2 and hellyerite (Ni[CO3]·6H2O) (Karwowski et al. 2011). More detailed analysis of the above phases revealed a new secondary phases, which are represented by: reevesite (Ni6Fe3+2CO3(OH)16·4H2O) as well as jarosite (KFe3+3(OH)6(SO4)2).

5

Fragmenty kopalnego meteorytu z Lechówki: charakterystyka mineralogiczna i geochemiczna

100%

Szopa K., Karwowski Ł., Krzykawski T., Brachaniec T.

Acta Societatis Metheoriticae Polonorum

|

2017

|

vol. 8

100-109

EN

Fossil iron meteorites are extremely rare in the geological sedimentary record. In the boundary clay from the outcrop at the Lechówka quarry (Poland), fragments of the paleometeorite were found in the Cretaceous-Paleogene boundary clay layer. The fragments of meteorite (2–6 mm in size) and meteoritic dust are metallic-grey in colour. Analyses of the meteorite from Lechówka reveal the presence of Ni-rich minerals with a total Ni amount of 2–3 wt%. They are represented by: taenite, kamacite, schreibersite, Ni-rich magnetite, and Ni-rich goethite. The investigated remnants of paleometeorite apparently represent an independent fall and does not seem to be derived from the K-Pg impactor.

6

Jak odróżnić oryginał od fałszywek: kopalny meteoryt z Lechówki

100%

Szopa K., Karwowski Ł., Krzykawski T., Brachaniec T.

|

vol. 9

112-122

EN

Value of meteorites can be explained at least in two aspects. From the scientific point of view they are priceless objects, which can bring important information about the very beginning of the Universe. Because of their rarity anduniqueness, the meteorites often are extremely expensive in the term of a commercial value. This situation is used by dishonest sellers who offer fake meteorites. It has happened with the paleometeorite remnants, which were originallyfound in Cretaceous-Paleogene clay boundary in Lechówka, Poland. The so-called fake Lechówka remnants were offered by one seller on domestic online shops. All grains had certificate of authenticity that was included with the sold grains. In this paper we described the most common and diagnostic features, which can be easily applied to distinguish the original meteorite remnants from the fake ones.

7

Skały impaktowe struktury Puczeż-Katunki, platforma wschodnio-europejska, Rosja

100%

Kosina R.

Acta Societatis Metheoriticae Polonorum

|

2019

|

vol. 10

74-91

EN

The complex Puchezh-Katunki (PK) structure was created in the area of the Vladimir-Vyatka dislocation zone on the crystalline basement of the East European platform. The crater ca 80 km in diameter is located north of the city Nizhny Novgorod and is covered by thick layers of Mesozoic sediments. Shocked rocks, mainly gneisses, have been described. Recrystallised feldspar-quartz melt is the most common component in specimens of impactites. The melt is preserved in the form of various clasts showing wavy nebulous contacts within the surrounding microcristalline or isotropic matrix. Planar deformation features (PDFs) were observed in the quartz grains, including toasted quartz. Their number ranges from one to three. The PDF lines are limited to the grain boundaries or cross them. A few ‘kinky’ cracks have been noted in the biotite plates. Lobate inter-grain contacts prove that quartz is recrystallised by grain-boundary migration. The recrystallized quartz also occurs in the form of ballen quartz and trydimite. Both types of quartz are numerous in the material under study. Tridymite tiles show patchy extinction. Various matrices formed from rock melts are microcrystalline (clay minerals) and contain fragments of isotropic glass, also in the form of spherules. In matrix, some clasts are in the form of the ballen quartz, sometimes with relics of PDFs. Matrices of recrystallized rock melts are characterised by different colours, number of clasts and are distinctly separated from each other. The melts during the impact process are immiscible. Secondary mineralization is more frequent in the rock melts and less frequent in the metamorphosed gneisses. Magnetite, pyrite and zeolites are the most common secondary minerals.

8

Średni ciężar atomowy chondrytu Vicência (LL3.2)

100%

Szurgot M.

|

vol. 9

126-144

EN

Mean atomic weight Amean of Vicência (LL3.2 S1W0, fall 2013) ordinary chondrite has been calculated using literature data (Keil et al. 2015) on chemical composition of the meteorite and using relationships: between mean atomic weight and Fe/Si atomic ratio, between Amean and grain density, and between Amean and magnetic susceptibility. It was shown that Vicência’s Amean = 22.91 for composition without water. This value is close to the mean atomic weight of LL chondrite falls, is close to Amean value of LL3 chondrite falls, and is close to Amean value of Semarkona LL3.0 chondrite. Vicência’s Fe/Si atomic ratio (0.492±0.050) leads to Amean = 23.06–23.26, which is close to the value determined by bulk composition. Vicência’s Fe/Si atomic ratio is close to the value for Semarkona’s (Fe/Si = 0.511), and is close to LL’s mean Fe/Si ratio (0.520). This confirms that Vicência belongs to LL chondrites, as previously classified. Using dependence between mean atomic weight and grain density leads to Amean = 21.89±0.54 (dgr = 3.28 g/cm3, Keil et al. 2015), and using dependence between Amean and magnetic susceptibility gives Amean = 23.01±0.24 (logc = 4.30, Keil et al. 2015). Arithmetic mean of Amean (dgr), Amean (logc), and Amean(Fe/Si), gives 22.72±0.73, the value close to Amean(bulk composition) determined using compositional data. Mean atomic number Zmean, and Amean/Zmean ratio of the meteorite have been also calculated. Vicência’s Zmean = 11.37, and Amean/Zmean ratio is: 2.015 for composition without water. Vicência’s silicates shown the values: Amean = 21,67, Zmean = 10.76, Amean/Z mean = 2.014, Fe/Si = 0.318, Amean(Fe/Si) = 22.07–22.18, and Fe, Ni metal values: Amean = 56.63, Zmean = 26.53, and Amean/Z mean = 2.135. Two dependences: i) grain density dgr on Amean, and ii) grain density dgr on Fe/Si atomic ratio, were used to determine/verify grain density of Vicência chondrite. It was established that dgr(Amean) leads to the values: 3,42 g/cm3 for Vicência chondrite, 3,25 g/cm3 for silicates, and 7,90 g/cm3 for Fe, Ni metal of Vicência meteorite. Dependence dgr(Fe/Si) predicts density for Vicência chondrite: 3,47–3,49 g/cm3, and for silicates: 3,32–3,35 g/cm3.

9

Najstarsze dowody archeologiczne i relacje tekstowe o różnych spadkach skał z kosmosu w najstarszej historii ludzkości

100%

Kotowiecki A.

Acta Societatis Metheoriticae Polonorum

|

2023

|

vol. 14

86-92

EN

The oldest evidence and records of catastrophic falls of large space rocks are undoubtedly impact craters that are studied by geologists. However, in historical times, i.e. the times of the emergence and development of human cultures, there are also records discovered by the latest geological but also archaeological research. Among the most spectacular are the discoveries of Chinese archaeologists. They link the invention of stone tools made on both sides (including fists and hatchets) almost 800,000 years ago in the area of the Bose Valley in Guangxi in southern China with the decline of tektites in the Middle Paleolithic. With the development and invention of writing, they are also reflected in sculptures, written texts, poems, notes and chronicles. Scientists believe that rock-carved symbols found in the world’s oldest temple, Göbekli Tepe in southern Turkey, dated to over 10,000 BC, are evidence that a comet caused the Little Ice Age. Also worth mentioning is the Epic of Gilgamesh, which is probably the oldest written story on Earth. Originally from ancient Sumeria, it was written in cuneiform on 12 clay tablets. It follows the adventures of the historical king of Uruk, somewhere between 2750 and 2500 BC. According to the translated text of the recently discovered new cuneiform tablets, on the so-called In the first Tablet, there is a record of a large meteorite that fell to the ground. However, the destruction of Sodom and Gomorrah described in the Bible, as recent research has shown, is also the result of a cosmic body that fell in this region of Jordan.

10

Nowy chondryt zwyczajny H5, S2, W1: Northwest Africa 11778

100%

Przylibski T., Łuszczek K., Kryza R., Blutstein K.

Acta Societatis Metheoriticae Polonorum

|

2020

|

vol. 11

77-97

EN

Based on petrological, mineralogical and geochemical analyses, the authors classified the new meteorite Northwest Africa 11778 as an ordinary chondrite H5, S2, W1. It is a single stone with mass 767.5 g and with well-preserved black fusion crust with brown shade (Fig. 1). This meteorite was found in Sahara Desert and it was purchased by Wroclaw University of Science and Technology, Faculty of Geoengineering, Mining and Geology from Moroccan dealer in Zagora in June 2013. The most characteristic component of analyzed chondrite are different types of chondrules (barred olivine – BO, porphyritic olivine – PO, granular olivine – GO, radial pyroxene – RP, porphyritic olivine-pyroxene – POP, cryptocrystalline – C) (Fig. 2), which constitute 75% of meteorite. Their size is in range 0.2–1.2 mm, with average chondrule size ca. 0.6 mm. Bigger porphyritic olivine chondrules with diameter up to 1.5 mm rarely occur. The chemical composition of olivine crystals (Fa 18 mol%) and pyroxene crystals (Fs 16.2 mol%) proves this meteorite to be an H chondrite (Tab. 1, Fig. 4–5, App. 1–2). The averaged concentration of major elements in the classified meteorite is comparable to their mean content in H chondrites (Fig. 8). The meteorite NWA 11778 contains only slightly less Mg and Al than average H chondrites (Tab. 2). Among the other analysed elements, values distinctly out of the range of typical concentrations for H chondrites are characteristic of Hg and Eu (lower concentration in the NWA 11778 meteorite) (Tab. 3, Fig. 8–9). The presence of chondrules with predominantly sharp boundaries (Fig. 2), secondary feldspar crystals with sizes of up to 50 mm, chiefly crystalline mesostasis and only secondarily – devitrified glass in chondrules, and transparent crystalline matrix (with olivine crystals up to 0.26 mm and pyroxenes up to 0.30 mm in size), as well as common occurrence of untwinned rhombic pyroxenes prove the classified meteorite to belong to petrological type 5. It is additionally confirmed by mean Ni content in troilite below 0.5 wt% (0.04 wt%) (Tab. 1, App. 4) and carbon content below 0.2 wt% (0.07 wt%) (Tab. 2). Undulatory extinction in some olivine and pyroxene crystals and the presence of irregular fractures in the NWA 11778 chondrite enables specifying its shock level as S2. The weathering grade adopted for the NWA 11778 chondrite was W1, as visible weathering changes cover only the marginal parts of FeNi alloy grains. As a result of the weathering of 10–20% of FeNi grains, iron oxides and hydroxides are formed. These secondary weathering Fe3+ compounds also fill cracks, forming veins running between chondrules within matrix (Fig. 3).

11

Impaktyty astroblemy Ilińce, Ukraina

100%

Kosina R.

Acta Societatis Metheoriticae Polonorum

|

2017

|

vol. 8

73-83

EN

The complex Ilyinets crater is an example of the small impact structure formed in crystalline target rocks of the Ukrainian Shield. Its impactites are characterised by examples of metamorphosed gneisses, granites, fine-grained polymict breccia and suevites. In the breccia and suevite matrix, fluidal clasts present their earlier brecciation. Lobate contacts between quartz grains show recrystallisation by grain-boundary migration. Shock structures, PFs, PDFs and “ballen quartz” are not very frequent. The monomict suevite breccia was determined among impactites.

12

Chondryt Sołtmany

100%

Przylibski T. A.

Acta Societatis Metheoriticae Polonorum

|

2016

|

vol. 7

93-122

EN

The Sołtmany hammer meteorite is classified as an ordinary chondrite type L6, W0, S2. At present it is the most thoroughly and comprehensively examined Polish meteorite. A comprehensive petrological, mineralogical and geochemical analysis alongside the investigation of its physical and particularly thermophysical properties, and, most of all, analyses of cosmogenic radionuclides and noble gases isotopes content, as well as the use of a troilite thermometer has made it possible to draw interesting conclusions concerning the genesis and evolution of the parent body and the history of the parent meteoroid and, finally, the Sołtmany meteorite. The present report attempts at summing up the results of studies conducted at several European research centres in the last four years. The age of the the Sołtmany chondrite parent rock has been defined at 4.137 billion years. It was formed at a temperature of up to 440–450 K (about 170°C), probably at a depth of up to 3 to 7 km under the surface of the parent body, i.e. at a pressure of the order of 1–2.4 kbar. Such a low temperature during the accretion, diagenesis and metamorphism of the parent body may point to its complicated development, which may be in part due to collisions of partially melted planetesimals. Like with other type L ordinary chondrites, one can infer that the parent body could have been destroyed about 467 million years ago, at the time of a catastrophic collision which led to the formation of Gefion family of planetoids. Perhaps one of the bodies in this family was involved in another collision about 29.2 million years ago, which resulted in ejecting the parent meteoroid of the Sołtmany chondrite onto the Earth collision trajectory. Before entering the Earth’s atmosphere, this meteoroid had the mass of about 36 kg and the diameter of ca 13.5 cm. During its flight through the atmosphere, it rotated and somersaulted, which resulted in the formation of an uniform thin (0.5–0.7 mm) fusion crust, whose temperature reached 1000°C. In the last phase, the Sołtmany meteorite fell almost vertically and its mass was a mere 3% of the mass of the parent meteoroid – 1.066 kg. It hit the roof and then the concrete stairs of a farm building, which caused it to break into two bigger and many small pieces. It was found a few minutes after the fall, which occurred at 6:03 a.m. (CEST, UTC+2:00) on 30 April 2011, by Wydmińskie Lake in northern Poland (54°00,53’N, 22°00,30’E). The Sołtmany chondrite is one of just 14 meteorites in which the activity concentration of the cosmogenic 52Mn has been determined, and one of the few ordinary chondrites where the concentration of organic matter has been defined. As a result, it was found out that unlike in carbonaceous CI chondrites, the composition of organic particles is dominated by less complex compounds (CHO and CHOS) than CHNO and CHNOS compounds. This may indicate the decomposition of more complex organic compounds into particles with simple structures during magmatic and metamorphic processes related to formation of type L ordinary chondrites.

13

Wpływ fali uderzeniowej na zmiany tektoniczne osadów jurajskich wokół krateru Ries – studium SEM wybranych skamieniałości

100%

Brachaniec T., Szopa K.

Acta Societatis Metheoriticae Polonorum

|

2016

|

vol. 7

21-26

EN

Upper Jurassic sediments of the Ries crater contain numerous fossils including massive and calcite belemnites, which show brittle deformations caused by impact shockwave. The structures are observed in macro and micro scale. SEM observations allowed to distinguish different tectonic forms in investigated material, what show the individualism of breccias formed during the Ries impact.

14

The Grand Canyon of the Colorado River - a super wonder of nature. Tourist, geographical and social expedition to Arizona, USA

100%

Borowski T.

The Institute of Biopaleogeography named under Charles R. Darwin

|

2023

|

vol. 20

1-109

EN

This paper presents the super beauty of the Colorado River Canyon and the social aspect in Arizona, USA. The illiteracy known in the world and existing in the USA on the example of Arizona is also presented in this paper. It is hard to agree that Americans are a smart nation. It can only be said that the society is now genetically different from Europe, etc. Widespread and pervasive illiteracy in the USA is a classic that is caused only by social policy in the USA. The expedition took place in May 2008.

15

Średni ciężar atomowy i gęstość ziaren chondrytu Jezersko (H4)

100%

Szurgot M.

Acta Societatis Metheoriticae Polonorum

|

2019

|

vol. 10

140-159

EN

Mean atomic weight Amean of Jezersko (H4 S2(3) W2, find in 1992 in Slovenia) ordinary chondrite has been calculated using literature data on chemical composition of the meteorite (Miler et al. 2014) and using relationship between mean atomic weight and Fe/Si atomic ratio (Szurgot 2015c, d, e). It was shown that Jezersko’s Amean = 24.68, for composition without water. This value is close to the mean atomic weight of H chondrite finds (Amean = 24.80), and is somewhat smaller than Amean values for H4 chondrite falls (Amean = 25.09), and for H chondrite falls (Amean = 25.05) (Szurgot 2015e). Jezersko’s Fe/Si atomic ratio (0.742) leads to Amean = 24.66±0.24, which is close to the value determined by bulk composition. Jezersko’s Fe/Si atomic ratio is close to the value for H’s mean Fe/Si ratio: 0.762 for finds, and 0.807 for falls (Szurgot 2016a). This confirms that Jezersko belongs to H chondrites, as previously classified (Miler et al. 2014). Mean atomic number Zmean, and Amean/Zmean ratio of the meteorite have been also calculated. Jezersko’s Zmean = 12.16, and Amean/Zmean ratio is: 2.029 for composition without water. Jezersko’s silicates shown the values: Amean = 21.77, Zmean = 10.78, Amean/Z mean = 2.019, Fe/Si = 0.272, Amean(Fe/Si) = 21.84±0.06, and Jezersko’s Fe,Ni metal values: Amean = 56.12, Zmean = 26.19, and Amean/Z mean = 2.143. Two dependences: i) grain density dgr on Amean (Szurgot 2015a), and ii) grain density dgrain on Fe/Si atomic ratio (Szurgot 2017g), were used to predict grain density of Jezersko chondrite. It was established that dgr(Amean) leads to the values: 3.65±0.07 g/cm3 for Jezersko chondrite, 3.27±0.07 g/cm3 for silicates, and 7.83±0.07 g/cm3 for Fe,Ni metal of Jezersko meteorite. Dependence dgr(Fe/Si) predicts somewhat higher value grain density for Jezersko chondrite: 3.68±0.07 g/cm3, and 3.32±0.07 g/cm3 for silicates. All the predictions lead to the mean value of grain density for its weathering W2 degree: 3.67±0.03 g/cm3 for the whole rock of meteorite, and 3.29±0.03 g/cm3 for the silicates. It was established that due to terrestrial weathering, resulting in W2 weathering stage, Amean value of Jezersko chondrite is about 0.45 lower, Fe/Si atomic ratio is about 0.075 lower, and dgrain is about 0.06 g/cm3 lower than values for unweathered (W0) meteorite. Predicted porosity for Jezersko chondrite is: 10,1±0,7% for W2, and 11,5±0,5% for W0.

16

Remarks on a specimen of the ‘Gardnos breccia’, Norway

100%

Kosina R., Madej S.

Acta Societatis Metheoriticae Polonorum

|

2020

|

vol. 11

45-59

EN

A specimen of the ‘Gardnos breccia’ was explored, in which granitic gneiss clasts were found to dominate over a dark matrix. Some clasts retained their cataclastic structure. The matrix of the specimen showed various colours, such as gray, black, and beige, while exhibiting different levels of hardness. In addition, the matrix appeared as an almost isotropic and microcrystalline mass. Quartz, K-feldspar, biotite and plagioclase were identified as the main minerals of the rock. No impact-generated features were observed in the minerals; however, biotite crystals showed decorated kinky bands. In cataclastic clasts, a net of black micro-veins was found, which can be interpreted as pseudotachylite. These veins were composed of a dark non-cohesive glassy mass and carbonaceous micro-aggregates. Furthermore, such carbonaceous aggregated particles were also observed in the black matrix. The white-greenish domains containing isotropic and microcrystalline aggregates of quartz and feldspars showed partial anisotropy. Domains were surrounded by a light recrystallising polycrystalline quartz. Hard black clasts of the matrix and the white-greenish domains showed great similarity in their mineral composition. The results of the X-ray diffraction analyses revealed the minerals as quartz, K-feldspar, muscovite and chlorite (clinochlore). In the white-greenish domains, albite was found as an additional component, whereas it was absent in the black matrix. The black matrix, which was interpreted as a pseudotachylite relic, also seemed to contain allochthonic components. Fluorite, calcite, and Fe-oxides were identified as the secondary minerals that were crystallised in the free spaces of the rock, filling the voids and cracks during the postimpact stage. Oriented glassy spherules, fragments with fluidal texture, and a fragment of the semi-vesicular glassy domain were noted in the specimen, which were probably relics of the suevite breccia. Thus, the analysed breccia seemed to be an intermediate type between the ‘Gardnos breccia’ and the black-matrix breccia and suevite.

PL

Uwagi o okazie ‘brekcji Gardnos’, Norwegia. W egzemplarzu skały znanej jako ‘brekcja Gardnos’ klasty granito-gnejsu dominują nad ciemną matriks. Niektóre klasty zachowały strukturę kataklastyczną. Matriks wykazywała różne kolory, szary, czarny i beżowy, a także różną twardość. Matriks była głównie masą izotropową i mikrokrystaliczną. Kwarc, K-skaleń, biotyt i plagioklaz są głównymi minerałami skały. W minerałach nie zaobserwowano struktur charakterystycznych dla impaktu, jednak w kryształach biotytu odnotowano dekorowane spękania ‘kinky’. W klastach kataklastycznych sieć czarnych mikrożyłek można interpretować jako pseudotachylit. Te żyły składają się z ciemnej, niespoistej szklistej masy, w tym z węglistych mikroagregatów. Zagregowane takie cząstki zaobserwowano również w macierzy czarnej. Biało-zielonawe domeny mikrokrystalicznych agregatów kwarcu i skaleni wykazały częściową anizotropię w partiach izotropowych. W domenach, zielonawe centra stopu skaleniowego otoczone są jasnym, rekrystalizującym polikrystalicznym kwarcem. Twarde czarne klasty macierzy i biało-zielonawe domeny charakteryzują się dużym podobieństwem w składzie minerałów. Analizy dyfrakcji rentgenowskiej wykazały, że były to kwarc, K-skalenie, muskowit i chloryt (klinochlor). W biało-zielonawych domenach dodatkowo występuje albit, nieobecny w czarnej macierzy. Macierz ta interpretowana jako relikt pseudotachylitu zawiera prawdopodobnie również składniki allochtoniczne. Fluoryt, kalcyt i tlenki żelaza były minerałami wtórnymi krystalizowanymi w wolnych przestrzeniach skały i wypełniały puste przestrzenie i pęknięcia w procesach poimpaktowych. Zorientowane szkliste sferule, fragmenty o fluidalnej teksturze i fragment szklistej domeny semi-pęcherzykowej są prawdopodobnie reliktami brekcji suevitu. Analizowana brekcja wydaje się być typem pośrednim między ‘brekcją Gardnos’ a brekcją z czarną matriks i suevitem.

17

Meteoryt Pułtusk. 150 lat eksploracji

100%

Kosiński J. W.

Acta Societatis Metheoriticae Polonorum

|

2019

|

vol. 10

95-110

EN

The article takes about exploration of the Pultusk meteorite in the years 1868–2018. Presented Polish scientists who undertook these issues: Tytus Babczyński, Karol Deike, Jan Samsonowicz and individuals seeking the meteorite. Meteorite exploration in recent years has been discussed.

18

1D modeling of aquifer vulnerability and soil corrosivity within the sedimentary terrain in Southern Nigeria, using resistivity method

100%

Eyankware M. O., Umayah S. O.

World News of Natural Sciences

|

2022

|

vol. 41

33-50

EN

Groundwater vulnerability/soil corrosivity was carried out within the study area, with the sole aim of classifying groundwater and soil corrosivity into various classes with the aid of the resistivity method. For this study the Vertical Electrical Sounding (VES) method was used, Schlumberger electrode configuration was used with maximum electrode spacing (AB/2) of 200 m in sixteen (16) different locations for data acquisition. Geoelectric parameters (layer resistivity and thickness) were determined from the interpreted data. Findings from Geoelectric Layer susceptibility indexing (GLSI) revealed that the northern, southern, and northeast of the study area value range of 70 to 160, 70 to 150, and 120 to 160 are considered to be highly vulnerable, vulnerable, and highly vulnerable respectively. The estimated result obtained from longitudinal unit conductance (S) showed that groundwater is considered to be slightly prone to contamination from the surface. Deduction from corrosivity revealed that VESs location showed no trace of corrosivity except for VES 15. According to findings from VES 15, underground metallic installations should be buried at a depth away from the aforementioned VES point.

19

Anomalie platynowców w historii Ziemi

100%

Wieczorek A., Brachaniec T.

Acta Societatis Metheoriticae Polonorum

|

2016

|

vol. 7

177-181

EN

The platinum-group elements comprise a very small percentage of elements in the earth’s crust. The primary sources of them are meteorite impacts and volcanism. The study of PGEs anomaly in sediment profiles as a possible indicator of impact began in 1980, when was suggested a link between high levels of iridium and the mass extinction event in Late Cretaceous.

20

Meteoryt Campo del Cielo – podstawowe badania mineralogiczne wybranego okazu

100%

Boczkowska M., Wójcik-Tabol P.

Acta Societatis Metheoriticae Polonorum

|

2021

|

vol. 12

17-30

EN

The carried out research concern Campo del Cielo meteorite. The specimen is a fragment of a meteoroid, which fall occurred 3950±90 years ago, in the northern areas of present-day Argentina. The aim of the study was a comparative analysis of the fragment in relation to the characteristics of the whole meteoroid, as well as gathering the existing knowledge about the meteorite rain Campo del Cielo. Metallographic section was made and then a series of point and area analyzes of the chemical composition were carried out in a scanning electron microscope. The metallic phase of the meteorite turned out to be relatively chemically homogeneous. The iron content for each area subjected to EDS microanalysis was in the range of 90–93%, while nickel content oscillated in the range of 6–10%. The distinct dominance of iron, which appears on the whole surface of the meteorite, indicates that the metallic phase is made of a kamacite crystal. The whole fragment can be called hexahedrite. Inclusions occupy a small percentage of the surface area of metallographic section. They were divided into inclusions containing phosphorus and other inclusions (containing Si, O, Ca, Al, Na). The occurrences of phosphorus associated with iron and nickel (subordinate) were identified as schreibersite [(Fe,Ni)3P]. This mineral showed interesting structures from the demixing and a certain regularity in distribution relative to the other inclusions. The research supplement the current knowledge about the whole meteoroid, confirming at the same time its heterogeneity. Despite the fact that it was part of the Campo del Cielo meteoroid before its disintegration, it has a chemical and structural composition characteristic only for itself, even if we talk about a slight deviation from the averaged features for the entire meteorite.

Refine search results

Visual Kerogen Study of the Campano-Maastrichtian Nkporo Group of Anambra Basin, Southeastern Nigeria

Dzieje kolekcji Neumannów

Nowe znaleziska mołdawitów w Polsce

Reevesyt i jarosyt – nowe wtórne fazy w meteorycie Morasko

Fragmenty kopalnego meteorytu z Lechówki: charakterystyka mineralogiczna i geochemiczna

Jak odróżnić oryginał od fałszywek: kopalny meteoryt z Lechówki

Skały impaktowe struktury Puczeż-Katunki, platforma wschodnio-europejska, Rosja

Średni ciężar atomowy chondrytu Vicência (LL3.2)

Najstarsze dowody archeologiczne i relacje tekstowe o różnych spadkach skał z kosmosu w najstarszej historii ludzkości

Nowy chondryt zwyczajny H5, S2, W1: Northwest Africa 11778

Impaktyty astroblemy Ilińce, Ukraina

Chondryt Sołtmany

Wpływ fali uderzeniowej na zmiany tektoniczne osadów jurajskich wokół krateru Ries – studium SEM wybranych skamieniałości

The Grand Canyon of the Colorado River - a super wonder of nature. Tourist, geographical and social expedition to Arizona, USA

Średni ciężar atomowy i gęstość ziaren chondrytu Jezersko (H4)

Remarks on a specimen of the ‘Gardnos breccia’, Norway

Meteoryt Pułtusk. 150 lat eksploracji

1D modeling of aquifer vulnerability and soil corrosivity within the sedimentary terrain in Southern Nigeria, using resistivity method

Anomalie platynowców w historii Ziemi

Meteoryt Campo del Cielo – podstawowe badania mineralogiczne wybranego okazu