The thermal history of the Acapulco meteorite and its parent body deduced from U/Pb systematics in mineral separates and bulk rock fragments

2010 ◽  
Vol 342 (1) ◽  
pp. 53-59 ◽  
Author(s):  
Christa Göpel ◽  
Gérard Manhès
2013 ◽  
Vol 119 ◽  
pp. 302-321 ◽  
Author(s):  
Marc Monnereau ◽  
Michael J. Toplis ◽  
David Baratoux ◽  
Jérémy Guignard

2017 ◽  
Vol 52 (10) ◽  
pp. 2193-2219 ◽  
Author(s):  
Poorna Srinivasan ◽  
Rhian H. Jones ◽  
Adrian J. Brearley

2009 ◽  
Vol 284 (1-2) ◽  
pp. 168-178 ◽  
Author(s):  
Mathieu Touboul ◽  
Thorsten Kleine ◽  
Bernard Bourdon ◽  
James A. Van Orman ◽  
Colin Maden ◽  
...  

2021 ◽  
Author(s):  
Makoto Kimura ◽  
Michael K. Weisberg ◽  
Asako Takaki ◽  
Naoya Imae ◽  
Akira Yamaguchi

Abstract Almahata Sitta is a polymict breccia, consisting of many kinds of clasts. Here we present our mineralogical and petrological results on an EL3 fragment, MS-177 from Almahata Sitta. This fragment shows a typical type 3 chondritic texture, consisting of well-defined chondrules often with olivine, isolated silicate minerals, and opaque nodules. Although these components are typical of EL3 chondrites, the mineral abundances and compositions are different from the other EL3s. Diopside is highly abundant. On the other hand, perryite and daubreelite were not found. The major pyroxene is orthoenstatite, and the silica phase is quartz. Fe-Ni metal has relatively high P contents. Troilite is enriched in Cr and Mn. Keilite and buseckite are present in MS-177. From the mineralogy and texture, MS-177 experienced a high-temperature event under subsolidus conditions. Shock-induced heating for a short duration might explain this high-temperature event. This is supported by shock-induced darkened feature of MS-177. We suggest that other E3 chondrites also experienced heating events under such subsolidus conditions on their parent bodies. On the other hand, the high abundance of diopside cannot be explained by a secondary thermal event and may have been a primary feature of MS-177, formed before accretion to the parent body.


1994 ◽  
Vol 122 (1-2) ◽  
pp. 183-194 ◽  
Author(s):  
Hiroshi Takeda ◽  
Hiroshi Mori ◽  
Donald D. Bogard

Icarus ◽  
2015 ◽  
Vol 245 ◽  
pp. 367-378 ◽  
Author(s):  
M.D. Hopkins ◽  
S.J. Mojzsis ◽  
W.F. Bottke ◽  
O. Abramov

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