甘肃西秦岭舟曲-武都地区中酸性侵入岩岩石地球化学特征及构造环境讨论  

Petrogeochemistry and Tectonic Setting of Intermediate-Acid intrusions in the Zhugqu-Wudu Region,Gansu

作　　者：曾强[1] 张腾 张琼 ZENG Qiang;ZHANG Teng;ZHANG Qiong(Regional Geological Surveying Team,BGEEMRSP,Chengdu 610213;Sichuan Vocational College of Cultural Industry,Chengdu 610213)

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]四川文化产业职业学院,成都610213

出　　处：《四川地质学报》2021年第S02期32-36,52,共6页Acta Geologica Sichuan

摘　　要：通过对西秦岭舟曲-武都地区中酸性侵入岩的调查研究,表明岩体总体属于高钾钙碱性系列,其稀土元素配分曲线呈向右缓倾型,轻稀土元素富集明显,铕负异常明显。形成时代为205~212Ma,为印支晚期。构造环境判别图解显示,具有同碰撞及火山弧构造环境,这可能与塔藏构造混杂岩带向北俯冲碰撞有关。Intermediate-Acid intrusions in the Zhugqu-Wudu region,Gansu belong to K-rich calc-alkaline series with LREE enrichment and obvious negative Eu anomaly.The intrusion was emplaced during the Late Indo-Sinian epoch with isotopic age values of 205~212 Ma.The emplaced tectonic setting was syn-collisional and volcanic arc possibly related to northwards subduction of the Tazang tectonic mélange zone.

关 键 词：西秦岭 中酸性侵入岩 岩石地球化学 构造环境 

分 类 号：P588.1[天文地球—岩石学]