内蒙古沙麦钨矿花岗岩岩石地球化学、锆石U-Pb年代学及其地质意义-岩石矿物学杂志-CSCIED科技核心评价数据库-手机版

内蒙古沙麦钨矿花岗岩岩石地球化学、锆石U-Pb年代学及其地质意义

Petrogeochemistry, zircon U-Pb chronology and geological implications of granite in Shamai tungsten deposit, Inner Mongolia

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DOI	10.20086/j.cnki.yskw.2023.0603
刊名	岩石矿物学杂志 Acta Petrologica et Mineralogica
年，卷(期)	2023, 42(6)
作者	李怀彬，籍进柱*，廉永，李腊梅，吴皓然,
作者单位	1. 中国冶金地质总局矿产资源研究院, 北京 101300; 2. 内蒙古工业大学资源与环境工程学院, 内蒙古呼和浩特 010051; 3. 锡林郭勒盟山金白音呼布矿业有限公司, 内蒙古锡林浩特 026316
摘要	沙麦钨矿床位于内蒙古东乌旗地区,是该区目前已探明的中型岩浆热液型钨矿床。矿体主要赋存在黑云母二长花岗岩和黑云母二长花岗斑岩中,对这两种花岗质岩石的岩相学、岩石地球化学和LA-ICP-MS锆石U-Pb年代学进行了研究。结果表明,黑云母二长花岗岩锆石U-Pb年龄为135.6±1.6 Ma和136.3±1.8 Ma,黑云母二长花岗斑岩锆石U-Pb年龄为138.6±1.1 Ma,二者侵位时间均为早白垩世。两种花岗质岩体具有富SiO₂(73.73%~78.23%)、高钾钠(Na₂O+K₂O)(7.56%~8.89%)、贫MgO(0.09%~0.20%)、贫CaO(0.51%~0.89%)、贫TiO₂(0.03%~0.12%)的特征,属于过铝质-高钾钙碱性系列;微量元素富集Rb、K、Th和U,相对亏损Sr、Ba、Nb、P和Ti元素,具有强烈的Eu负异常,具有较高的FeO^T含量,较高的FeO^T/MgO和FeO^T/(FeO^T+MgO) 值显示A型花岗岩的特征。结合区域构造背景和地质资料,认为沙麦花岗岩锆石 U-Pb 年龄与中国东部大规模成矿事件年龄范围一致,形成于燕山期造山后伸展构造环境中,与区域内大规模岩石圈减薄和伸展背景有关。
Abstract	Shamai tungsten deposit is a medium sized magmatic hydrothermal deposit located in Dong Ujimqin Banner of Inner Mongolia. The ore bodies mainly occur in biotite monzonite granite and biotite monzonite granite porphyry. In this study, the petrography, LA-ICP-MS zircon U-Pb chronology and petrogeochemistry of biotite monzonite granite and biotite monzonite granite porphyry are studied in order to clarify the genesis and age of the two rocks and provide further data for regional prospecting. The results show that the LA-ICP-MS zircon U-Pb ages of biotite monzogranite are 135.6±1.6 Ma and 136.3±1.8 Ma, and the biotite monzonite granite porphyry is 138.6±1.1 Ma. The main elements show they are peraluminous high potassium calc alkaline granite which are characterized by high SiO₂ (73.73%~78.23%), Na₂O+K₂O (7.56%~8.89%)and low MgO (0.09%~0.20%), CaO (0.51%~0.89%), TiO₂ (0.03%~0.12%). They are enriched in Rb, K, Th, U, and depleted in Sr, Ba, Nb, P, Ti, with strong negative Eu anomaly and high FeO^T content, FeO^T/MgO and FeO^T/(FeO^T+MgO) ratio indicating the characteristics of A-type granite. The zircon U-Pb age of the Shamai granite is consistent with the age range of the large-scale metallogenesis in eastern China. The tectonic environment discrimination diagrams indicate that it was formed in the extensional tectonics environment after the continental collision in the Yanshanian period, which is related to the lithospheric thinning of northern margin of the North China Craton.
关键词	兴蒙造山带；锆石U-Pb定年；岩石地球化学；A型花岗岩；后碰撞伸展
KeyWord	Xing-Meng orogenic belt; LA-ICP-MS zircon U-Pb chronology; petrogeochemistry; A-type granite; post collisional extension
基金项目
页码	809-825

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李怀彬，籍进柱*，廉永，李腊梅，吴皓然. 内蒙古沙麦钨矿花岗岩岩石地球化学、锆石U-Pb年代学及其地质意义 [J]. 岩石矿物学杂志. 2023; 42; (6). 809 - 825.

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