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西秦岭窗尔山一带侵入岩地球化学特征及成矿意义
- 作者：
- 韦乐乐|严康|李康宁
- 作者单位：
- 陕西国际商贸学院珠宝学院，陕西省宝石教学示范中心|甘肃省地质矿产勘查开发局第三地质矿产勘查院|甘肃省地质矿产勘查开发局第三地质矿产勘查院
基金项目：
- 中国地质调查局项目（121201004000160901）；国家自然科学基金项目（41421002）
详细信息：
- 作者简介：
- 韦乐乐（1989—），女，陕西西安人，讲师，硕士，从事矿物学、岩石学等研究；西安市西咸新区沣西新城统一西路35号，陕西国际商贸学院珠宝学院，712046；E-mail：1079047171@qq.com
- 通讯作者：
- isnull
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Geochemical characteristics of intrusive rocks in Chuangershan area of Western Qinling Mountains and their mineralization significance
- English Author：
- Jewelry Institute of Shaanxi Institute of International Trade and Commerce,Shaanxi Province Gemological Teaching Demonstration Center|The Third Institute of Geology and Minerals Exploration,Gansu Provincial Bureau of Geology and Minerals Exploration and Development|The Third Institute of Geology and Minerals Exploration,Gansu Provincial Bureau of Geology and Minerals Exploration and Development
- Unit：
- 摘要
- 在线预览
- 参考文献
摘要:
窗尔山一带位于西秦岭西北部夏河—临潭一带，地质构造复杂，成矿条件优越。通过对窗尔山一带侵入岩进行岩石学和地球化学研究，结果表明:侵入岩轻稀土元素富集，具有负铕异常；微量元素富集大离子亲石元素（Ba、K、Rb等），相对亏损高场强元素（Nb、Ta、Ti等），以及强烈亏损相容元素（Cr、Ni、Co等），总体上具有I型花岗岩特征；结合区域大地构造背景，侵入岩与古秦祁昆洋盆消减作用有关，形成于火山弧环境，为俯冲板片熔体与地幔物质相互作用的产物，并在上升侵位过程中受到上地壳物质的混染，与研究区内矿产的形成具有密切关系。铁、铜、金等矿种主要受岩体及构造、岩性控制，研究区中酸性侵入岩与灰岩接触带是铁、铜、金等矿种的有利成矿地段，具有一定的找矿潜力。
关键词:
侵入岩；地球化学；构造环境；成矿意义；窗尔山一带
Abstract:
The Chuangershan area is located in the Xiahe-Lintan area in the northwest of the West Qinling Mountains,and is with complex geological structures and superior metallogenic conditions.According to the petrological and geochemical studies of the intrusive rocks in Chuangershan area,the intrusive rocks were enriched in light rare earth elements and had negative europium anomaly;the trace elements were enriched in large ion lithophile elements (Ba,K,Rb,etc.),relatively depleted in high field strength elements (Nb,Ta,Ti,etc.) and strongly depleted in compatible elements (Cr,Ni,Co,etc.),in general displaying the characteristics of type I granite;according to the regional tectonic background,the intrusive rocks were related to the subduction of the ancient Qin-Qi-Kun ocean basin and formed in the volcanic arc environment.These were the products of the interaction between subducted plate melt and mantle material,and were mixed with the upper crust material in the process of uplift and emplacement,which was closely related to the formation of minerals in the area.Iron,copper and gold minerals were mainly controlled by rock mass,structure and lithology.The contact zone between intermediate acid intrusive rock and limestone in the study area is a favorable ore-forming area for iron,copper and gold minerals,and has certain ore-prospecting potential.
Keywords:
intrusive rock;geochemistry;tectonic setting;metallogenic significance;Chuangershan area
