Title: Cr spinel and chromite as petrogenetic indicators in ordinary chondrites: Equilibration temperatures of petrologic types 3.7 to 6
Abstract: Meteoritics & Planetary ScienceVolume 40, Issue 11 p. 1673-1702 Free Access Cr spinel and chromite as petrogenetic indicators in ordinary chondrites: Equilibration temperatures of petrologic types 3.7 to 6 Frank Wlotzka, Corresponding Author Frank Wlotzka Max-Planck-Institut Für Chemie, Abteilung Kosmochemie, Becherweg 27, Mainz D-55128, Germany[email protected]Search for more papers by this author Frank Wlotzka, Corresponding Author Frank Wlotzka Max-Planck-Institut Für Chemie, Abteilung Kosmochemie, Becherweg 27, Mainz D-55128, Germany[email protected]Search for more papers by this author First published: 26 January 2010 https://doi.org/10.1111/j.1945-5100.2005.tb00138.xCitations: 105AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Abstract— Many Equilibrated Ordinary Chondrites Contain (Besides Chromites Of Constant Composition) Cr Spinel With A Large Spread In Cr/(Cr + Al) Ratios. They Occur Mainly As Large Grains In Chondrules Rich In Mesostasis, Preventing Complete Equilibration In Cr/Al But Not In Fe/Mg. This Partially Equilibrated Cr Spinel Turned Out To Be Particularly Useful For The Selection Of An Appropriate Olivine/Spinel Thermometer And For The Determination Of Equilibration Temperatures. The Main Results Are: 1) The H3.7 To 3.8 And The L3.7 To 3.8 Chondrites Analyzed Show Temperatures Of 625 To 680 °C; 2) Equilibrated Chondrites Show A Range Of Olivine/Cr-Spinel Temperatures Between 700 And 820 °C, And The Same Average Temperatures For Type 4 To 6 (Number Of Analyzed Meteorites In Brackets): H4 (9) 766 °C, H5 (7) 774 °C, H6 (3) 775 °C, L4 (5) 752 °C, L5 (4) 754 °C, L6 (1) 754 °C. 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