Hello List, http://www.lpi.usra.edu/meetings/lpsc2004/pdf/1562.pdf
I've read through many of the LPSC abstracts and this one seems to be significant in that it suggests a reconsideration of the subtypes of many CV3s. The authors utilized several methods to determine the subtypes of CV3 chondrites; Raman spectometry of organic material, a petrologic study of Fe zoning, and a noble gas study, rather than the TL sensitivity data of feldspar typically used for ordinary chondrite subtyping, and which was previously applied to the CV3s. They propose that TL sensitivity data is not applicable to aqueously altered CCs and they have redefined the petrographic subtypes of the common CV3s as follows: Allende - >3.6 (TL - 3.2) Axtell - >3.6 (TL - 3.0) Grosnaja - ~3.6 (TL - 3.3) Kaba - 3.1 (TL - 3.0) Mokoia - ~3.6 (TL - 3.2) Bali - >3.6 (TL - 3.0) Efremovka - 3.4-3.6 (TL - 3.2) Vigarano - 3.1-3.4 (TL - 3.3) Leoville - 3.1-3.4 (TL - 3.0) They plan to make further studies to validate this one. David ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
