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2011 | 2 | 112-116
Article title

Ameboidalne oliwinowe agregaty w chondrytach zwyczajnych

Content
Title variants
EN
Amoeboid Olivine Aggregates in ordinary chondrites
Languages of publication
PL
Abstracts
EN
An amoeboid olivine aggregates (AOA) are the refractory end-member of a family of fine-grained inclusions. They consist of masses of fine-grained (generally forsteritic) olivine crystals with other phases dispersed in between. The AOA are important components of carbonaceous chondrite and have been reported only from the unequilibrated Semarkona LL3.0 ordinary chondrite and examined by author equilibrated Sahara 02500 ordinary chondrite. The AOA’s are thought to represent solar-nebula condensates that experienced high-temperature annealing, but largely escaped melting. An amoeboid olivine aggregate found in the equilibrated ordinary Sahara 02500 chondrite has experienced weak planetary metamorphism resulting in equilibration and recrystallization of fine-grained olivine and albitic feldspar. The aggregate contains several fine-grained inclusions consisting of recrystallised fayalitic olivine, feldspar and minor amounts of metal, diopside, chromite, and apatite.
Year
Volume
2
Pages
112-116
Physical description
References
  • Itoh S., Russell S.S, Yurimoto H. 2004. Amoeboid olivine aggregates from the Semarkona LL3.0 chondrite. Geochimica et Cosmochimica Acta 68: Supplement A766.
  • Komatsu M., Krot A.N., Keil K., Kasama T., Tachikawa O., Ulyanov A., Miyamoto M. 2001. Mineralogy and petrology of amoeboid olivine aggregates from Efremovka, Leoville, Vigarano and Allende. Meteoritics & Planetary Science 36: Supplement A103.
  • Komatsu M., Krot A.N., Mikouchi T, Tagai T, Miyamoto M., Keil K. 2004. Amoeboid olivine Aggregates in the NWA 760 CV3 chondrite. Lunar and Planetary Science XXXV: abstract no 1537.
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  • Sweet A., Chizmadia L. 2007. Using Fe and Mg in olivine as an indicator of asteroidal hydrothermal alteration. Bulletin of the American Astronomical Society 38: 203–226.
  • Van Schmus W.R., Wood J.A. 1967. A chemical-petrologic classification for the chondritic meteorites. Geochim. Cosmochim. Acta 31, 747–765.
  • Krot A.N., Petaev M.I., Russell S.S., Itoh S., Fagand T.J., Yurimoto H., Chizmadia L., Uylanov A.A., Keil K. 2004. Amoeboid olivine aggregates and related objects in carbonaceous chondrites: records of nebular and asteroid processes. Chemie der Erde 64, 185–239.
Document Type
article
Publication order reference
YADDA identifier
bwmeta1.element.psjd-441d0793-24c8-4cd8-b47a-51daa1a08254
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