摘要
在川西甲基卡矿床外围新发现了建巴村中酸性侵入岩体,为了探讨其形成时代、成岩构造背景及其成矿条件,开展了LA-ICP-MC锆石U-Pb年代学和地球化学特征研究。结果表明:该岩体的结晶年龄为(211.8±1.0) Ma;岩石属于钙碱性-高钾钙碱性准铝质中酸性侵入岩系列,具有Ⅰ型花岗岩类的特征,其物质来源可能为壳源物质与幔源物质部分熔融。地球化学特征表明其形成于后碰撞环境,与此时期内川西地区的区域性岩浆活动相对应。建巴村岩体的构造位置及岩浆活动特征指示其可能不具备形成伟晶岩矿床的条件。
The Jianbacun intermediate-acid intrusion was newly discovered in the peripheral area of Jiajika deposits. The authors have conducted the research of LA-ICP-MS zircon U-Pb geochronology and geochemistry to discuss its forming age, tectonic setting and mineralization condition. The results show that the zircon crystalizing age is(211.8±1.0) Ma, and the rock belongs to calc-alkaline-metamluminous rock series, with properties of Ⅰ-type granitoid, which may originate from partial melting of materials from crust and mantle. The geochemical characteristics indicate that the rock formed in post-collision setting, corresponding to the widespread regional magmatism in Western Sichuan Province during the Late Triassic. The tectonic setting property and magmatism of Jianbacun quartz diorite indicate that this area may be inadequate for the mineralization related to pegmatite mineral deposits.
作者
李名则
秦宇龙
赵春
詹涵钰
周雄
孙光银
LI Mingze;QIN Yulong;ZHAO Chun;ZHAN Hanyu;ZHOU Xiong;SUN Guangyin(Key Laboratory for Strategic Resources Evaluation and Utilization of Rare Metals and Rare Earth, Sichuan Province, Chengdu 610081, China;Sichuan Institute of Geological Survey, Chengdu 610081, China;Chengdu Institute of Multiple Utilization of Mineral Resources, China Geological Survey, Chengdu 610041, China;No.113 Geological Team of Sichuan Bureau of Geology and Mineral Resources, Luzhou 646000, China)
出处
《中国地质调查》
2020年第5期1-9,共9页
Geological Survey of China
基金
中国地质调查局“四川康定瓦多—龙古地区(H47E010021、H47E010022、H47E011021、H47E011022)4幅1∶50000区域地质调查(编号:DD20160074)”
“四川康定—道孚—雅江稀有金属整装勘查区矿产调查与找矿预测(编号:121201004000150017-93,12120113049500)”
四川省科技厅“川西锂矿大型能源资源基地成矿关键技术研究与示范(编号:2018SZ0276)”项目联合资助。
