| 南祁连党河南山中段科克巴斯陶玄武岩年代学、地球化学特征及其地质意义 |
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| 引用本文： | 王磊,李向民,胡兆国,杨超,郭令芬,闫海忠,葛瑞臣,计波.南祁连党河南山中段科克巴斯陶玄武岩年代学、地球化学特征及其地质意义[J].大地构造与成矿学,2019,43(5):1069-1077. |
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| 作者姓名： | 王磊 李向民 胡兆国 杨超 郭令芬 闫海忠 葛瑞臣 计波 |
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| 作者单位： | 中国地质调查局 西安地质调查中心, 自然资源部岩浆作用成矿与找矿重点实验室, 陕西 西安 710054;中国冶金地质总局山东正元地质勘查院,山东济南,250014;中国地质大学(北京)地球科学与资源学院,北京 100083;哈尔滨师范大学地理科学学院,黑龙江哈尔滨 150025 |
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| 基金项目： | 中国地调局地质调查项目;中国地调局地质调查项目 |
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| 摘 要： | 与柴北缘和北祁连相比,南祁连研究程度偏低,对其各个阶段的构造演化缺少精确时限。对分布于南祁连党河南山中段的科克巴斯陶玄武岩进行了岩石地球化学及锆石U-Pb年代学研究,定年结果显示,该玄武岩成岩年龄为713±4.6Ma,为新元古代震旦纪。岩石地球化学分析表明,科克巴斯陶玄武岩SiO2含量为45.08%~49.81%,MgO为4.37%~6.67%,Na2O为2.95%~3.71%,K2O为0.28%~1.92%,TiO2为1.40%~2.01%,与拉斑玄武岩平均值相似。Nb/Y-SiO2图解显示科克巴斯陶玄武岩属亚碱性系列拉斑玄武岩。其ΣREE为(75.47~124.00)×10^-6,LREE/HREE为4.2~6.19。(La/Yb)N为3.67~6.18,(La/Sm)N为1.83~2.64,球粒陨石标准化稀土元素配分曲线图呈轻稀土明显富集的右倾型。原始地幔标准化微量元素蛛网图上,岩石以富集Sr、K、Rb、Ba为特征。岩石地球化学特征显示科克巴斯陶玄武岩岩浆为具OIB性质的地幔源区,其形成于板内洋岛构造环境。结合区域地层对比及锆石测年成果,将原划定的志留系巴龙贡嘎尔组进行了重新解体,由南至北,分别为志留系巴龙贡嘎尔组变砂岩段、新元古界震旦系天峻组火山岩段和中新元古界拐杖山组片岩段。
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| 关 键 词： | 玄武岩 岩石化学 锆石U-PB定年 党河南山 南祁连 |
Zircon U-Pb Dating and Geochemistry of Kebasitao Basalt from the Middle Part of Southern Danghe Mountains in Southern Qilian and its Geological Implication |
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| WANG Lei,LI Xiangmin,HU Zhaoguo,YANG Chao,GUO Lingfen,YAN Haizhong,GE Ruichen,JI Bo.Zircon U-Pb Dating and Geochemistry of Kebasitao Basalt from the Middle Part of Southern Danghe Mountains in Southern Qilian and its Geological Implication[J].Geotectonica et Metallogenia,2019,43(5):1069-1077. |
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| Authors: | WANG Lei LI Xiangmin HU Zhaoguo YANG Chao GUO Lingfen YAN Haizhong GE Ruichen JI Bo |
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| Institution: | (MNR Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits,Xi’an Center of Geological Survey,China Geological Survey,Xi’an 710054,Shaanxi,China;Geological Exploration Institute of Shandongzhengyuan,China Metallurgical Geology Bureau,Jinan 250014,Shandong,China;School of the Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China;College of Geographic Science,Harbin Normal University,Harbin 150025,Heilongjiang,China) |
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| Abstract: | WANG Lei;LI Xiangmin;HU Zhaoguo;YANG Chao;GUO Lingfen;YAN Haizhong;GE Ruichen;JI Bo(MNR Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits,Xi’an Center of Geological Survey,China Geological Survey,Xi’an 710054,Shaanxi,China;Geological Exploration Institute of Shandongzhengyuan,China Metallurgical Geology Bureau,Jinan 250014,Shandong,China;School of the Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China;College of Geographic Science,Harbin Normal University,Harbin 150025,Heilongjiang,China) |
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| Keywords: | basalt geochemistry LA-ICP-MS zircon U-Pb dating southern Danghe Mountains southern Qilian |
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