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CAIs in Semarkona (LL3.0)Calcium, Aluminum-rich inclusions (CAIs) are the first forming solids of the Solar system. Their observed abundance, mean size, and mineralogy vary quite significantly between different groups of chondrites. These differences may reflect the dynamics and distinct cosmochemical conditions present in the region(s) of the protoplanetary disk from which each type likely accreted. Only about 11 such objects have been found in L and LL type while another 57 have been found in H type ordinary chondrites, compared to thousands in carbonaceous chondrites. At issue is whether the rare CAIs contained in ordinary chondrites truly reflect a distinct population from the inclusions commonly found in other chondrite types. Semarkona (LL3.00) (fall, ~691 g) is the most pristine chondrite available in our meteorite collection. Here we report petrography and mineralogy of 3 CAIs from Semarkona
Document ID
20160002389
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Mishra, R. K. (Oak Ridge Associated Universities, Inc. Houston, TX, United States)
Simon, J. I. (NASA Johnson Space Center Houston, TX, United States)
Ross, D. K. (Jacobs Technology, Inc. Houston, TX, United States)
Marhas, K. K. (Lunar and Planetary Inst. Houston, TX, United States)
Date Acquired
February 26, 2016
Publication Date
March 21, 2016
Subject Category
Geophysics
Report/Patent Number
JSC-CN-35196
Meeting Information
Meeting: Lunar and Planetary Science Conference
Location: The Woodlands, TX
Country: United States
Start Date: March 21, 2016
End Date: March 25, 2016
Sponsors: Lunar and Planetary Inst.
Distribution Limits
Public
Copyright
Public Use Permitted.

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