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地质学报  2007 

中甸地区甭哥正长岩地球化学特征及其地质意义

, PP. 995-1003

Keywords: 正长岩甭哥中甸地区地球化学锆石U-Pb年龄

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Abstract:

长期以来,甭哥正长岩体被认为是印度―欧亚板块碰撞引起的走滑剪切构造所控制的碱性岩浆活动的产物。本文研究表明甭哥正长岩属钾玄岩系列,富集K2O(5.88%~9.08%)、稀土元素(特别是轻稀土元素)和大离子亲石元素,高场强元素亏损,具有岛弧型微量元素特征。地球化学数据表明原岩于高压条件下发生部分熔融,岩浆源区深度较大,经历了结晶分异作用形成正长岩岩浆。甭哥正长岩的锆石稀释法U-Pb测定年龄为201.4Ma,略晚于中甸弧钙碱性斑岩,其形成的构造环境是弧后拉张环境,甘孜―理塘洋向西低角度俯冲使中甸地区地壳挤压增厚,从而在较深的深度形成原始岩浆。在中甸岛弧岩浆演化后期存在区域性的构造体制转折,从区域性的挤压环境转换成区域性的拉张环境,甭哥岩体的侵位处于两者的过渡时期。

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