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Nowy Polski meteoryt z Drelowa: charakterystyka geochemiczna, mineralogiczna i petrologiczna

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Szopa K., Mirek A., Żmija M., Kmieciak K., Krzykawski T.
Acta Societatis Metheoriticae Polonorum
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2025
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vol. 16
51-66
EN
The meteorite fall was recorded and found by the Skytinel fireball network. The fall was observed on 18 Feb 2025, at 18:04 (UT+1). The meteoroid’s orbit, atmospheric trajectory, and strewn field were calculated, and about 60 fragments with a mass of approx. 3700 g were till the end of March 2025. The first fragment (93 g) was found four days after the fall. The fusion crust is black (composed of glassy material with Fe-rich skeletal spinel inclusions). Chondrules are rare, and they are not bigger than 1.5 mm in diameter. Typically they are up to 0.8 mm in size. Chondrules are represented by different types. The main types are: porphyritic olivine chondrules (PO), barred olivine chondrules (BO)>granular olivine pyroxene (GOP)>radial pyroxene (RP). Most of the chondrules are easily distinguished, and are deformed. In some parts of the specimens, black shock veins are visible in a hand specimens. Metal alloys are represented by kamacite, taenite and tetrataenite. The investigated meteorite also shows native copper grains (up to 5 mm in diameter). The main composition of the meteorite is (vol.%): Ol (35.5), Opx (43), Cpx (9.2), Pl (5.0), Tr (3.5), Kam (2.7), Mer+Ap (0.4) and Chr (0.3). The Fa, Fs, and Te content in olivine (mean content; mol.%) is 25.94, 73.35, and 0.55, respectively. Low-Ca pyroxenes are homogenous, where Wo is 1.65, Fs is 22.00, and En is 76.34 (mol.%). The mean content of Al2O3, MgO and TiO2 in chromium spinel is 5.6 wt.%, 2.36 wt.% and 2.73 wt.%, respectively. Homogenous troilite is with minimal sulpfur deficiency. The Ni and Co content in troilite is up to 0.04 wt.% and 0.11 wt.%, respectively. The metal phases are represented by kamacite, taenite and tetrataenite. The kamacite has a Ni content in the 5.83–6.81 wt.% range, while the Co content is 0.39 to 0.56 wt.%. The tetrataenite is characterised by a Ni content from 49.68 to 50.46 wt.% and Co up to 0.05 wt.%. High-Ca monoclinic pyroxene, similar to diopside, is rare. Pyroxene with plagioclase is located in the mezostasis. The feldspar composition is as follows (mean; N = 37): Ab (83.91%), Or (5.78%), An (10.31%) and Cs (0.03%). The feldspars grains are also between the matrix and close to metamorphosed chondrules. Feldspars are up to 200 um in length. Accessory minerals are phosphates (chlorapatite
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