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宁强陨石中不透明矿物集合体的氧同位素和成因研究

关键词:opaque assemblage O-isotope in situ ion microprobe analysis Ningqiang carbonacecus chondrite

基金项目:本文为中国科学院百人计划“引进国外杰出人才”资助项目

作者	单位	E-mail
王英	紫金山天文台天体化学和行星科学实验室，江苏南京，210008 中国科学院研究生院，北京，100039	y-wang@pmo.ac.cn
徐伟彪	紫金山天文台天体化学和行星科学实验室，江苏南京，210008
华欣	紫金山天文台天体化学和行星科学实验室，江苏南京，210008 Departoment of Mechanical/Aerospace Engineering
管云彬	Departoment of Geological Sciences, Arizona State University, Tempe, AZ 85287, USA

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Oxygen Isotopes and Origin of Opaque Assemblages in Ningqiang Carbonaceous Chondrites

Chondrules and matrix of the Ningqiang carbonaceous chondrite contain abundant opaque assemblages (OAs). They are composed of magnetite, Ni-rich metals and Fe-sulfides, with minor phosphate, silicate, and trace amounts of platinum-group element metals. The ion probe measurements show that; ①The O-isotopic compositions of magnetite fall on a mass-dependent fractionation line (slop：0.51±0.04, Δ17O：-2.8±0.4‰), and δ18O values range widely from -15.3‰ to-1.6‰. ②The OAs and chondrules (Δ17O of the olivine：-5.0‰) are unequilibrated with regard to their O-isotopic compositions. OAs most likely formed by secondary alteration processes in a parent body, where aqueous fluid oxidized the metal into magnetite and enriched the residual metal in Ni.

WANG Ying,XU Weibiao,HUA Xin,GUAN Yunbin.2005.Oxygen Isotopes and Origin of Opaque Assemblages in Ningqiang Carbonaceous Chondrites[J].Acta Geoscientica Sinica,26(z1):6-9.

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