| 祁漫塔格东段晚三叠世—早侏罗世花岗岩LA-ICP-MS锆石U-Pb年龄及其地质意义 |
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| 引用本文： | 赵洪菊,陈静,王秉璋,陈发彬,王国良,宋泰忠.祁漫塔格东段晚三叠世—早侏罗世花岗岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2017,36(6):1001-1009. |
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| 作者姓名： | 赵洪菊 陈静 王秉璋 陈发彬 王国良 宋泰忠 |
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| 作者单位： | 1. 青海省地质调查院, 青海 西宁 810012;2. 青海省青藏高原北部地质过程与矿产资源重点实验室, 青海 西宁 810012 |
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| 基金项目： | 中国地质调查局项目《柴达木周缘及邻区成矿带地质矿产调查评价专项》（编号：1212010818048）、青海省地质勘查基金项目《青海省格尔木市拉陵灶火铜多金属矿整装勘查区找矿部署研究》（编号：青国土资矿[2015]83） |
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| 摘 要： | 祁漫塔格东段拉陵高里河地区晚三叠世—早侏罗世花岗岩组合为高SiO_2(72.18%~76.55%)、高K_2O(4.08%~5.32%)的碱性花岗岩组合,具有明显的负Eu异常(δEu平均值为0.28)。岩石组合为二长花岗岩+正长花岗岩,采用LA-ICP-MS技术测得二长花岗岩和正长花岗岩的年龄分别为205.1±1.0Ma和199.5±1.2Ma。该套花岗岩组合与拉陵高里河地区的矽卡岩型多金属矿关系密切,初步确定祁漫塔格地区晚三叠世—早侏罗世花岗岩组合也是一期重要的成矿岩浆建造。
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| 收稿时间： | 2017/1/13 0:00:00 |
| 修稿时间： | 2017/4/20 0:00:00 |
LA-ICP-MS zircon U-Pb dating of the Late Triassic-Early Jurassic granites in the eastern part of Qimantag area and its geological significance |
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| ZHAO Hongju,CHEN Jing,WANG Bingzhang,CHEN Fabin,WANG Guoliang and SONG Taizhong.LA-ICP-MS zircon U-Pb dating of the Late Triassic-Early Jurassic granites in the eastern part of Qimantag area and its geological significance[J].Geologcal Bulletin OF China,2017,36(6):1001-1009. |
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| Authors: | ZHAO Hongju CHEN Jing WANG Bingzhang CHEN Fabin WANG Guoliang and SONG Taizhong |
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| Institution: | 1. Qinghai Geological Survey Institute, Xi''ning 810012, Qinghai, China;2. Qinghai Provincial Key Laboratory of Geological Processes and Mineral Resources of Northern Qinghai-Tibetan Plateau, Xi''ning 810012, Qinghai, China |
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| Abstract: | The Late Triassic-Early Jurassic granitic assemblage in the eastern part of Qimantag area has high SiO2 content (72.18%~76.55%), high K2O content (4.08%~5.32%) and obvious negative Eu anomaly (average σEu value being 0.28).The granitic assem-blage is composed of monzogranite and syenogranite, whose ages were precisely redefined by the LA-ICP-MS zircon U-Pb meth-od, being 205.1±1.0 Ma and 199.5±1.2 Ma respectively.This granitic assemblage has close relationship with skarn-type polymetallic deposits in Lalinggaoli area.Therefore, the authors preliminarily hold that the Late Triassic-Early Jurassic granitic assemblage is proba-bly an important ore-forming magmatic formation in the eastern part of Qimantag area. |
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| Keywords: | Qimantag granite Late Triassic-Early Jurassic LA-ICP-MS zircon U-Pb age |
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