Oxygen Isotopic Compositions in a Plagioclase-Olivine Inclusion from Ningqiang Similar to Those in Al-rich Chondrules

作     者：DAI Deqiu BAO Haimei LIU Shuang YIN Feng DAI Deqiu;BAO Haimei;LIU Shuang;YIN Feng

作者机构：Department of GeologyHunan University of Science and TechnologyXiangtanHunan 411201China Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Hunan Provincial Key Laboratory of Shale Gas Resource UtilizationHunan University of Science and TechnologyXiangtanHunan 411201China 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2021年第95卷第5期

页      面：1583-1590页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported by the Natural Science Foundation of China(Grant Nos.41673070,41103032,41503062) the Hunan Provincial Natural Science Foundation of China(Grant No.2021JJ30242) the Scientific Research Fund of Hunan Provincial Education Department(Grant No.18A204) 

主　　题：meteorite petrology oxygen isotopes CAIs plagioclase–olivine inclusion Al-rich chondrules Ningqiang chondrite Shanxi 

摘      要：We report the petrology and oxygen isotopic composition,using a Cameca Nano SIMS 50L ion microprobe,of a plagioclase-olivine inclusion,C#1,found in the Ningqiang carbonaceous *** addition to major phases(plagioclase,spinel and olivine),C#1 is also surrounded by a pyroxene rim(64 vol%Ca-rich and 36 vol%Ca-poor pyroxenes).On a three-isotope oxygen diagram,δ^(17)O vs.δ^(18)O,the compositions of individual minerals analyzed in C#1 fall along the carbonaceous chondrite anhydrous mineral line(CCAM),and oxygen isotopic compositions in C#1 show significant variability in δ^(18)O and δ^(17)*** oxygen isotopic compositions of the pyroxene rim minerals are similar to those of the other host minerals,which suggests that the rim likely formed from the same melting process as the *** rim is considered to have formed as a result of interaction between an ^(16)O-poor gas and a *** spinel grains are typically ^(16)O-rich and likely of relict origin,which is similar to ^(16)O-rich Ca-,Al-rich inclusions,which are probably a precursor of C#*** inclusion then likely melted in an ^(16)O-poor region where chondrules form,accompanied by oxygen isotope exchange with an ^(16)O-poor *** anorthite,pyroxene and spinel might have undergone fluid-assisted thermal metamorphism on the Ningqiang chondrite parent *** oxygen isotope data and evolution of the C#1 plagioclase-olivine inclusion are similar with those of Al-chondrules in chondrites.