[an error occurred while processing this directive] 世界地质 2020, 39(3) 495-508 DOI:   10.3969/j.issn.1004-5589.2020.03.001  ISSN: 1004-5589 CN: 22-1111/P

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本文关键词相关文章
岩石地球化学
锆石U-Pb测年
Hf同位素
辉长岩
锡铁山铅锌矿区
本文作者相关文章
廖宇斌
李碧乐
孙永刚
杨佰慧
高歌悦
刘国文
PubMed
Article by Liao Y
Article by Li B
Article by Sun Y
Article by Yang B
Article by Gao G
Article by Liu G
柴达木盆地北缘锡铁山铅锌矿区辉长岩锆石U-Pb年代、岩石地球化学和Hf同位素特征
廖宇斌, 李碧乐, 孙永刚, 杨佰慧, 高歌悦, 刘国文
吉林大学地球科学学院, 长春 130061
摘要: 为确定锡铁山矿区辉长岩的形成时代、原岩性质和岩石成因,笔者对其进行锆石U-Pb年代学、岩石地球化学及Hf同位素的研究。结果表明:辉长岩LA-ICP-MS锆石U-Pb年龄为(514.7 ±1.1)Ma,属于中寒武世;岩石中SiO2含量为47.88%~49.87%,MgO为4.66%~5.21%,TiO2为0.47%~0.51%,P2O5为0.04%~0.05%,K2O为0.34%~0.56%,Na2O为2.67%~3.24%,Mg#为61.67~65.84,为高铝的钙碱性系列岩石;具有略右倾的稀土配分曲线模式,显示明显的正Eu异常(δEu=1.74~1.92);岩石的锆石Hf同位素εHf(t)为4.1~7.67,单阶段模式年龄(TDM1)为950~812 Ma,表明岩浆源区为亏损地幔。岩石富集大离子亲石元素K、Ba、Sr和不相容元素U,亏损高场强元素Nb、Zr和P和Ti,显示为典型的岛弧岩浆岩特征。综合研究认为,锡铁山辉长岩形成在柴达木洋向北俯冲于祁连山地块之下的岛弧环境,进一步证实柴北缘在中寒武世发生了洋壳俯冲作用。
关键词 岩石地球化学   锆石U-Pb测年   Hf同位素   辉长岩   锡铁山铅锌矿区  
Zircon U-Pb age, petrochemistry and Hf isotope characteristics of gabbro in Xitieshan Pb-Zn mining area in northern margin of Qaidam Basin
LIAO Yu-bin, LI Bi-le, SUN Yong-gang, YANG Bai-hui, GAO Ge-yue, LIU Guo-wen
College of Earth Sciences, Jilin University, Changchun 130061, China
Abstract: In order to confirm the formation age, protolith characters and petrogenesis, the LA-ICP-MS zircon U-Pb dating, petrochemistry and Hf isotope analysis are carried out for the gabbro in the Xitieshan mining area. The results show that the gabbro has the zircons with weighted mean age of (514.7±1.1)Ma, implying that the gabbro emplaced in Middle Cambrian. Geochemical data indicate that the gabbro has such major element contents as SiO2: 47.88%~49.87%, MgO: 4.66%~5.21%, TiO2: 0.47%~0.51%, P2O5: 0.04%~0.05%, K2O: 0.34%~0.56%, Na2O: 2.67%~3.24%, Na2O>K2O and Mg#: 61.67~65.84, which show the characters of high aluminum calc-alkaline rocks. Slightly right-leaning REE distribution patterns and obvious positive Eu anomaly (δEu = 1.74~1.92) are also indicated. The εHf(t) values of the gabbro range from 4.1 to 7.67 and single-stage Hf model ages (TDM1) range from 950 Ma to 812 Ma, suggesting that the magma originated from depleted mantle. The rock is enriched in LILE (e.g., K, Ba, Sr) and incompatible elements U, but depleted in HFSE(e.g., Nb, Zr, P and Ti), showing the typical island-arc magmatic rock characteristics. The gabbro in Xitieshan area was formed in the island-arc setting where the northern margin of Qaidam oceanic crust subducted beneath the southern Qilian block. It further confirms that oceanic crust subduction occurred in the northern margin of Qaidam Basin during the Middle Cambrian.
Keywords: petrochemistry   zircon U-Pb dating   Hf isotope   gabbro   Xitieshan Pb-Zn mining area  
收稿日期 2020-04-10 修回日期 2020-05-04 网络版发布日期  
DOI: 10.3969/j.issn.1004-5589.2020.03.001
基金项目:

中国地质调查局整装勘查项目(121201004000150017)

通讯作者: 李碧乐(1965-),男,教授,博士生导师,主要从事矿床学研究。E-mail:libl@jlu.edu.cn
作者简介:
作者Email: libl@jlu.edu.cn

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