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作 者:薛永丽 李欣 刘芳[1] 康晋霆 张兆峰[1] XUE Yong-li;LI Xin;LIU Fang;KANG Jin-ting;ZHANG Zhao-feng(State Key Laboratory of Isotope Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Gemstone and Art Design,WuZhou University,Wuzhou 543002,China;Key Laboratory of Crust-Mantle Materials and Environments,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China)
机构地区:[1]中国科学院广州地球化学研究所同位素地球化学国家重点实验室,广东广州510640 [2]中国科学院大学,北京100049 [3]梧州学院宝石与艺术设计学院,广西梧州543002 [4]中国科学技术大学地球和空间科学学院,中国科学院壳幔物质与环境重点实验室,安徽合肥230026
出 处:《地球化学》2021年第4期329-339,共11页Geochimica
基 金:国家自然科学基金重大项目子课题(41490632);国家自然科学基金(41773062);2021年梧州学院人才引进科研启动基金(WZUQDJJ20095);梧州学院2021年校级科研项目(2021A005)。
摘 要:准确限定球粒陨石的Ca同位素组成对于研究太阳星云物质演化和行星形成都具有重要意义。选取7块典型的球粒陨石,包括3块CV3型陨石(Leoville、Allende和Vigarano)、1块CM2型陨石(Murchison)、1块CO3.2型陨石(Kainsaz)、1块EH4型陨石(Indarch)以及1块H4型陨石(LaPaz Icefield 03601),进行了Ca同位素组成的研究。其中,Kainsaz、Leoville和LaPaz Icefield 03601共3块陨石的Ca同位素组成是首次报道。结果显示:(1)在增大样品量以规避“样品量效应”的情况下,我们对CV群球粒陨石Ca同位素组成进行更加精确的制约,δ44/40Ca的平均值为0.45‰±0.04‰(n=3,2SE);(2)碳质球粒陨石的Ca同位素组成相对于硅酸盐地球偏轻,从CV群(0.45‰±0.04‰,2SE)、CM群(0.73‰±0.04‰,2SE)到CO群(0.78‰±0.03‰,2SE)逐渐变重,可能与不同化学群陨石中富钙铝难熔包体(CAIs)丰度的变化有关;(3)顽火辉石球粒陨石和普通球粒陨石的Ca同位素组成与硅酸盐地球(BSE)组成一致,证实它们可以作为地球初始的组建物质。本研究丰富了球粒陨石Ca同位素组成数据库,有利于正确认识球粒陨石的Ca同位素组成及变化原因。Understanding the calcium isotopic compositions of chondrites is vital for elucidating processes of planetary formation processes and the composition of Earth.In this study,we investigated seven typical meteorites,including five carbonaceous chondrites(Leoville(CV3),Allende(CV3),Vigarano(CV3),Murchison(CM2),and Kainsaz(CO3.2)),one enstatite chondrite(Indarch(EH4)),and one ordinary chondrite(LaPaz Icefield 03601(H4)).Results showed that(1)the three CV3 chondrites displayed similar calcium isotopic compositions with an averageδ44/40Ca value of 0.45±0.05‰(n=3,2SE),using large mass samples to eliminate the“sampling effect”,which further constrained the Ca isotopic composition of CV chondrites;(2)theδ44/40Ca values of the carbonaceous chondrites were lower than that of the Earth,becoming gradually heavier from CV,CM to CO,which could be explained by the various abundances of isotopically light CAIs(CAIs:Calcium Aluminum Inclusions);(3)the enstatite chondrite and the ordinary chondrite were isotopically identical to the bulk silicate Earth within analytical uncertainty,suggesting that they could be the components of Earth’s initial building blocks.Our results enriched the Ca isotope database of chondrites,which is helpful for constraining the Ca isotopic compositions ofchondrites and investigating the possible mechanisms that cause Ca isotope variations in the solar system.
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