[1]王建中钱壮志,徐 刚,姜 超.西秦岭白马山“C”型埃达克岩成因:地球化学、Sr-Nd-Pb同位素制约[J].华东地质,2016,37(03):174-181.[doi:10.16788/j.hddz.32-1865/P.2016.03.003]
 WANG Jian-zhong,QIAN Zhuang-zhi,XU Gang,et al.Petrogenesis of the Baimashan C-type adakite in Western Qinling: Constraints from their geochemistry and Sr-Nd-Pb isotopic compositions[J].East China Geology,2016,37(03):174-181.[doi:10.16788/j.hddz.32-1865/P.2016.03.003]
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西秦岭白马山“C”型埃达克岩成因:地球化学、Sr-Nd-Pb同位素制约()
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《华东地质》[ISSN:2096-1871/CN:32-1865/P]

卷:
37
期数:
2016年03期
页码:
174-181
栏目:
基础地质
出版日期:
2016-09-15

文章信息/Info

Title:
Petrogenesis of the Baimashan C-type adakite in Western Qinling: Constraints from their geochemistry and Sr-Nd-Pb isotopic compositions
文章编号:
2096-1871(2016)03-174-08
作者:
王建中12钱壮志2徐 刚2姜 超2
(1 中国人民武装警察部队黄金第五支队, 西安 710100)
(2 长安大学西部矿产资源与地质工程教育部重点实验室, 西安 710054)
Author(s):
WANG Jian-zhong12 QIAN Zhuang-zhi2 XU Gang2 JIANG Chao2
(1. No. 5 Gold Geological Party of Chinese Armed Police Force, Xi’an 710100, China)
(2. Key Laboratory of Western China’s Mineral Resources and Geological Engineering, Ministry of Education; Chang`an University, Xi’an 710054, China)
关键词:
地球化学 Sr、Nd、Pb同位素组成 “C”型埃达克岩 岩石成因 西秦岭
Keywords:
geochemistry Sr-Nd-Pb isotopic compositions C-type adakite petrogenesis Western Qinling
分类号:
P597
DOI:
10.16788/j.hddz.32-1865/P.2016.03.003
文献标志码:
A
摘要:
白马山小岩体位于西秦岭白马山金矿区内,与矿床具有密切的空间关系。通过研究白马山岩体主量、微量及稀土元素地球化学特征及Sr-Nd-Pd同位素组成特征,探讨其岩石成因。白马山石英闪长岩属高钾钙碱性系列岩石,具有与“C”型埃达克岩相似的地球化学特征。Sr-Nd-Pb同位素组成特征显示,该小岩体富放射性成因Pb,初始(87Sr/86Sr)t比值为0.70637,εNd(t)=-6.75,具有较高的TDM值(1.53Ga),说明岩浆主要来自于大陆下地壳,且与耀岭河群的基性火山岩相似,这些“C”型埃达克质岩浆可能源于加厚基性下地壳的部分熔融,其残留相为(角闪)榴辉岩。
Abstract:
The Baimashan small rock body, relatedto gold deposit in space, is located in the Baimashan gold mining field, western Qinling metallogenic belt. This study conducted geochemical characteristics analysis of main elements, trace elements and rare earth elements, and Sr-Nd-Pdisotopic composition so as to understand its petrogensis. The results indicate that these rocks belong to high K calc-alkalic series and have geochemical compositions similar to the C-type adakite. Sr-Nd-Pb isotopic compositions show thattherock body is characterized by enrichment of radiogenic Pb, with initial(87Sr/86Sr)t of 0.706, negative εNd(t) of -6.75, and TDM of1.53Ga, implying that the magmas should derive from lower continental crust andgeochemically similar to the mafic rocks of the Yaolinghe Group. It can be concluded that the rock might result from partial melting of thickened mafic lower crust, with residual phase being amphibole eclogite.

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备注/Memo

备注/Memo:
?收稿日期:2015-08-12 改回日期:2015-09-14 责任编辑:谭桂丽
基金项目:国家自然科学基金“新疆喀拉通克铜镍硫化物矿床成矿作用与深部地质过程”(项目编号:41372101)。
第一作者简介:王建中,1978年生,男,博士,主要从事矿产勘查及矿床学研究工作。
更新日期/Last Update: 2016-09-19