Dear List Members, There was some question about the strange clasts in the NWA 3118 CV3s. They looked like CO3 chondrule-fields to me so I had them studied. Oxygen isotope studies were performed at Carnegie and Petrologic/Microprobe work was performed at UW. Here are the most interesting results:
Northwest Africa 3118, additional data Morocco Purchased 2003 December CV3 chondrite A small stone representing part of the main mass held by A. and G. Hup� (Hup�) was found to contain a dark inclusion measuring approximately 9 cm by 2.5 cm by 1 cm. Microprobe examination of the inclusion by A. Irving and S. Kuehner (UWS) shows it to consist of small chondrules and chondrule fragments composed of very magnesian olivine (Fa1.1) with marginal Fe-rich reaction zones (Fa36.9) against a porous matrix composed of felted blades of relatively ferroan olivine (Fa40.9-45.9) with accessory troilite and pentlandite. This clast has the attributes of Type A/B dark inclusions described by Brearley and Jones (1998, p. 3-227), and the textures suggest that it may have formed by partial sublimation of original chondrules and re-condensation. Oxygen isotope analysis by D. Rumble (CIW) of acid-washed whole inclusion material by laser fluorination gave replicate values of ?17O = +0.08, -0.18; ?18O = 5.14, 4.99; ?17O = -2.63, -2.81 per mil, respectively, which plot on the best fit line for whole rock CV chondrites. Here is a specimen that clearly demonstrates what the above report describes: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=6513101418 I hope you found the above data as interesting as I did. Kind Regards, ------------------------------------ Adam Hupe The Hupe Collection Team LunarRock IMCA 2185 [EMAIL PROTECTED] ______________________________________________ Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
