| 辽东半岛早白垩世黑云母二长闪长岩锆石U-Pb年龄、Hf同位素特征及地质意义 |
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| 引用本文： | 寇林林,张朋,赵岩,姚晓峰,沙德铭,杨中柱.辽东半岛早白垩世黑云母二长闪长岩锆石U-Pb年龄、Hf同位素特征及地质意义[J].地球科学,2020,45(11):3950-3961. |
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| 作者姓名： | 寇林林 张朋 赵岩 姚晓峰 沙德铭 杨中柱 |
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| 作者单位： | 1.中国地质调查局沈阳地质调查中心, 辽宁沈阳 110034 |
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| 基金项目： | 国家重点研发计划项目2018YFC0603804国家重点研发计划项目2016YFC0600108国家自然科学基金项目41502093中国地质调查局地质调查项目DD20190165中国地质调查局地质调查项目DD20190042-3中国地质调查局地质调查项目DD20160049 |
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| 摘 要： | 为探讨辽东半岛中生代闪长岩类岩石成因及其形成构造背景，选取辽东半岛岫岩西南部黄岭岩体为研究对象，开展岩相学、锆石LA-ICP-MS U-Pb年代学、Hf同位素地球化学和岩石地球化学研究.结果表明:黄岭岩体由黑云母二长闪长岩组成；锆石LA-ICP-MS U-Pb年龄为127.4±1.9 Ma，成岩为早白垩世；岩石地球化学元素特征表明，黄岭黑云母二长闪长岩具高钾钙碱性，轻稀土元素富集，重稀土亏损，富集Rb、Zr、K等大离子亲石元素，亏损Nb、P、Ti等高场强元素，正Eu异常；εHf（t）值为－20.1~－18.0，二阶段Hf模式年龄TDM2为2 316~2 450 Ma，揭示二长闪长岩可能是古元古代古老地壳部分熔融形成.结合区域构造演化推测黄岭岩体形成于古太平洋板块向欧亚板块俯冲挤压后折返伸展的构造背景.
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| 关 键 词： | 锆石U-Pb年龄 稀土元素 地球化学 黄岭岩体 辽东半岛 |
| 收稿时间： | 2020-07-10 |
Zircon U-Pb Age,Hf Isotope and Geological Significance of Early Cretaceous Monzodiorite in Liaodong Peninsula |
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| Abstract: | In order to determine the petrogenesis and tectonic setting of the Early Cretaceous biotite monzodiorite in Liaodong Peninsula,the lithology identification,zircon LA-ICP-MS U-Pb dating,major and trace elements,and Hf isotope data for the Huangling rock mass from southwest of Xiuyan are presented in this paper. The LA-ICP-MS U-Pb ages of the Huangling pluton of the monzodiorite is 127.4±1.9 Ma. The results of elemental and isotope geochemistry show that the Huangling monzodiorite belongs to high-K calc-alkaline series,and enriched in LREE and LILE (Rb,Zr,K),but depleted in HREE and HFSE (Nb,P,Ti) with positive Eu anomalies. The zircon εHf(t) values of the pluton range from -20.1 to -18.0,TDM2 ranges between 2 450 and 2 316 Ma,suggesting that the monzodiorite was mainly derived from the partial melting of the Paleoproterozoic crustal material. Combined with regional tectonic evolution,it is proposed that the Huangling monzodiorite diagenetic tectonic environment is the active continental margin,maybe formed in the extension tectonic environment,which is closely associated with the subduction of the Paleo-Pacific plate. |
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