广西大宁岩体和初洞岩体锆石U-Pb年代学及Hf同位素研究

利用锆石LA-ICP-MSU-Pb定年,获得大宁岩体形成年龄为441.1±3.0Ma,其包体年龄为439.5±3.6Ma,初洞岩体形成年龄为423.5~434.2Ma。结果表明,大宁岩体及其包体几乎同期形成,而初洞岩体是后期的侵入体。Lu-Hf同位素研究结果表明,大宁岩体及其暗色包体与初洞岩体具有相似的Hf同位素组成,在εHf(t)?年龄图上落在1440~1960Ma的老地壳区间,表明三者的岩浆源区均是早元古代到中元古代地壳,暗色包体是岩浆早期分离结晶的产物,而初洞岩体是岩浆结晶分异晚期的产物。...

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Bibliographic Details
Published in北京大学学报（自然科学版） Vol. 53; no. 4; pp. 667 - 682
Main Author 郭丽爽;吕鑫;王政华;毛佐国;张继林;刘玉琳;陈旭
Format Journal Article
LanguageChinese
Published 中国地震局地壳动力学重点实验室,北京 100085 2017
造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京 100871%中国地质调查局发展研究中心,北京,100037%万宝矿产有限公司,北京,100053%中国黄金集团公司贺州市金琪矿业有限责任公司,贺州,542800%北京金有地质勘查有限责任公司,北京,100070%造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京 100871%Department of Energy and Mineral Engineering, The Pennsylvania State University, University Park, PA 16802
中国地震局地壳应力研究所,北京 100085
Subjects
锆石U-Pb年代学;Hf同位素;大宁岩体;初洞岩体
Chudong pluton
初洞岩体
zircon U-Pb dating
Daning pluton
锆石U-Pb年代学
Hf同位素
Hf isotopes
大宁岩体
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ISSN0479-8023
DOI10.13209/j.0479-8023.2017.009

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Summary:利用锆石LA-ICP-MSU-Pb定年,获得大宁岩体形成年龄为441.1±3.0Ma,其包体年龄为439.5±3.6Ma,初洞岩体形成年龄为423.5~434.2Ma。结果表明,大宁岩体及其包体几乎同期形成,而初洞岩体是后期的侵入体。Lu-Hf同位素研究结果表明,大宁岩体及其暗色包体与初洞岩体具有相似的Hf同位素组成,在εHf(t)?年龄图上落在1440~1960Ma的老地壳区间,表明三者的岩浆源区均是早元古代到中元古代地壳,暗色包体是岩浆早期分离结晶的产物,而初洞岩体是岩浆结晶分异晚期的产物。
Bibliography:zircon U-Pb dating; Hf isotopes; Daning pluton; Chudong pluton
LA-ICP-MS zircon U-Pb dating for Daning pluton,dark inclusions and Chudong pluton yield the weighted mean206Pb/238Pb ages of441.1±3.0Ma,439.5±3.6Ma and423.5-434.2Ma,respectively,revealing that Daning pluton and the dark inclusions were formed almost concurrently,while the Daning pluton was intruded by the Chudong pluton.In-situ zircon Lu-Hf isotopic analyses of Daning pluton,dark inclusions and Chudong pluton show same characteristics with negativeεHf(t)values,plotted within the revolution areas of the1440-1960Ma old continental crust in the age vs.εHf(t)diagrams.The Hf isotopic characteristics indicate that the magmas could be derived from the partial melting of Early Proterozoic to Mesoproterozoic crust materials.The dark inclusions were produced by the fractional crystallization of parental magma.The Chudong pluton was the advanced stage product of the magma crystallization differentiation.
11-2442/N
ISSN:0479-8023
DOI:10.13209/j.0479-8023.2017.009