西昆仑团结峰地区碱性玄武岩的发现及大地构造意义  

Discovery of Alkaline Basalt and Its Geotectonic Significance in the Tuanjiefeng Region,West Kunlun

作　　者：史少飞 魏永峰[1] 邓浩然[1] 李玲 SHI Shao-fei;WEI Yong-feng;DENG Hao-ran;LI Ling(Regional Geological Surveying Team,BGEEMRSP,Chengdu 610213;Lanzhou Jiaotong University,Lanzhou 730070)

机构地区：[1]四川省地质矿产勘查开发局区域地质调查队,成都610213 [2]兰州交通大学,甘肃兰州730070

出　　处：《四川地质学报》2021年第S01期39-45,共7页Acta Geologica Sichuan

基　　金：西昆仑-阿尔金成矿带地质矿产调查(1212011220646)项目资助。

摘　　要：在团结峰地区化石山新发现玄武岩。通过常量元素分析,该区域玄武岩TAS图落入碱性区,AR-SiO2图解落入碱性区,说明玄武岩为碱性玄武岩。根据主量元素分析,该碱性玄武岩为板内玄武岩,兼具洋中脊玄武岩的特征。根据微量和稀土元素分析,其可能为由两种或两种以上不同属性的地幔源经混合后再发生局部熔融的产物,该区玄武岩显示出板内玄武岩向洋中脊玄武岩演化的特征。根据其构造环境分析,显示团结峰地区碱性玄武岩可能形成于板内向初始洋壳转化的环境。研究区碱性玄武岩的发现,碱性玄武岩的发现,对于恢复、重建中国中生代构造格局,进一步研究西昆仑造山带的地质构造演化提供了新的实际资料。Basalt is found in Huashishan,Tuanjiefeng.It is an alkaline basalt as an intraplate basalt and has the characteristics of mid-ocean ridge basalt and was derive from two different mantle.Possibly,it was formed under intraplate conditions transformed into the initial oceanic crust.Its discovery provides new information for reconstruction of Mesozoic geotectonic pattern in China and for further study on the tectonic evolution of the west Kunlun orogenic belt.

关 键 词：团结峰地区 碱性玄武岩 地球化学 大地构造 

分 类 号：P588.14[天文地球—岩石学]