| 延边天佛指山花岗岩的形成时代及成因 |
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| 引用本文： | 张赫芷,韩亚杰,曾孝文,蒋令旭.延边天佛指山花岗岩的形成时代及成因[J].世界地质,2016,35(3):666-675. |
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| 作者姓名： | 张赫芷 韩亚杰 曾孝文 蒋令旭 |
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| 作者单位： | 1. 吉林大学 地球科学学院，长春 130061; 2. 吉林大学 博物馆，长春 130026 |
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| 摘 要： | 延边天佛指山花岗岩年代学和地球化学研究表明,花岗岩中的锆石U-Pb年龄为(188.5±2.2)Ma,其侵位时间为早侏罗世。岩石总体上具有高硅、低铝、贫钙镁及富碱的特征,属高钾钙碱性系列I型花岗岩;富集轻稀土元素(LREE)和大离子亲石元素(LILE)Rb、Th、U、K等,相对亏损高场强元素(HFSE)Zr、Hf、Y、Yb等,显著亏损Ba、Nb、Ta、P、Ti等元素,δEu呈轻微程度负异常。该花岗岩岩浆源于地壳物质的部分熔融,可能形成于与古太平洋板块俯冲相关联的活动大陆边缘环境。
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| 关 键 词： | 花岗岩 U-Pb 测年 地球化学 延边 |
Formation age of granites in Tianfozhishan of Yanbian and its petrogenesis |
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| ZHANG He-Zhi,HAN Ya-Jie,ZENG Xiao-Wen,JIANG Ling-Xu.Formation age of granites in Tianfozhishan of Yanbian and its petrogenesis[J].World Geology,2016,35(3):666-675. |
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| Authors: | ZHANG He-Zhi HAN Ya-Jie ZENG Xiao-Wen JIANG Ling-Xu |
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| Institution: | 1. College of Earth Sciences，Jilin University，Changchun 130061，China; 2. Museum of Jilin University，Changchun 130026，China |
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| Abstract: | The chronological and geochemical studies of granites in Tianfozhishan of Yanbian show the zircon U - - Pb dating of granites as (188. 5 ±2. 2) Ma，in the Early Jurassic． The granites are characterized by high sili- con and alkali，low aluminium，calcium and magnesium，belonging to high- K calc- alkaline series I type granites． Rocks are riched in LREE and LILE (e. g． Rb，Th，U and K)，relatively deficited in HFSE (e. g． Zr，Hf，Y and Yb) and significantly deficited in Ba，Nb，Ta，P and Ti，with weak Eu anomaly． The granite magma derived from partial melting crustal material，and may be formed in an active continental margin associated with subduction of Paleo- Pacific Plate． |
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| Keywords: | granite U-Pb dating geochemistry Yanbian |
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