| 北阿尔金构造带红柳沟钾长花岗岩地球化学特征、LA-ICP-MS锆石U-Pb定年和Hf同位素组成 |
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| 引用本文： | 康 磊1, 刘 良1, 曹玉亭1, 王 超1, 2, 杨文强1, 朱小辉1. 北阿尔金构造带红柳沟钾长花岗岩地球化学特征、LA-ICP-MS锆石U-Pb定年和Hf同位素组成[J]. 地质通报, 2011, 30(07): 1066-1076. |
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| 作者姓名： | 康 磊1 刘 良1 曹玉亭1 王 超1 2 杨文强1 朱小辉1 |
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| 作者单位： | 1. 大陆动力学国家重点实验室/西北大学地质学系, 陕西 西安 710069;2. 中国地质调查局西安地质矿产研究所, 陕西 西安 710054 |
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| 摘 要： | 出露于阿尔金构造带北缘红柳沟-拉配泉混杂岩带西段的红柳沟钾长花岗岩, SiO2>69.0%, Al2O3>13.0%,(K2O+Na2O)>7.0%, K2O/Na2O>1, A/CNK介于1.04~1.08之间, 属高钾钙碱性系列的弱过铝质岩石。该岩石富集大离子亲石元素(LILE), 亏损Nb、Ta、Sr、P、Ti等高场强元素(HFSE);∑REE偏低(128.47×10-6~150.67×10-6), Eu负异常中等(δEu=0.59~0.67), LREE相对富集, 轻重稀土元素分馏明显, 其Nb/Ta、Zr/Hf比值接近上地壳, 锆石具有负的εHf(t)值(-7.13~-5.12),两阶段Hf模式年龄(TDM2)变化范围为1786~1912Ma, 反映其源区物质主要来源于古老地壳。源岩判别图解和Al2O3/TiO2<100指示其为中上地壳变质砂屑质沉积岩部分熔融的产物。LA-ICP-MS锆石U-Pb年龄为500.3Ma±1.2Ma, 结合锆石CL图像具有岩浆环带特征和Th/U>0.4, 推断该年龄为花岗岩的形成年龄。综合区域地质背景, 认为该岩石形成于与洋壳俯冲作用有关的陆缘火山弧环境。
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| 关 键 词： | 北阿尔金构造带 钾长花岗岩 地球化学 锆石LA-ICP-MS U-Pb定年 Hf同位素 |
Geochemistry,zircon LA-ICP-MS U-Pb ages and Hf isotopes of Hongliugou moyite from north Altyn Tagh tectonic belt |
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| KANG Lei1, LIU Liang1, CAO Yu-ting1, WANG Chao1, 2,YANG Wen-qiang1, ZHU Xiao-hui1. Geochemistry, zircon LA-ICP-MS U-Pb ages and Hf isotopes of Hongliugou moyite from north Altyn Tagh tectonic belt[J]. Geological Bulletin of China, 2011, 30(07): 1066-1076. |
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| Authors: | KANG Lei1 LIU Liang1 CAO Yu-ting1 WANG Chao1 2 YANG Wen-qiang1 ZHU Xiao-hui1 |
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| Affiliation: | 1. State Key Laboratory of Continental Dynamics/Department of Geology, Northwest University, Xi'an 710069, Shaanxi, China; 2. Xi′an Institute of Geology and Mineral Resources,China Geological Survey, Xi′an 710054, Shaanxi, China |
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| Abstract: | Hongliugou moyite outcropped in western Hongliugou-Lapeiquan complex belt belongs to high K cal-alkaline granites, characterized by SiO2>69.0%, Al2O3>13.0%, (K2O+Na2O)>7.0%, K2O/Na2O>1, 10.4, and hence this age can be regarded as the formation age of the moyite. Combined with regional geological characteristics, the authors consider that the formation of the rock was related to the subduction of the oceanic crust, with the tectonic setting being continental margin arc. |
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| Keywords: | northern Altyn Tagh tectonic belt moyite geochemistry zircon LA-ICP-MS U-Pb ages Hf isotopes |
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