吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (2): 445-459.doi: 10.13278/j.cnki.jjuese.20170332
梁涛1,2, 卢仁1,2, 王莉1,2
Liang Tao1,2, Lu Ren1,2, Wang Li1,2
摘要: 二郎坪岩体位于北秦岭构造带的东部,主体岩性为斑状黑云母二长花岗岩,对其开展锆石精确定年和地球化学成因研究有助于深入认识晚中生代北秦岭的深部过程。LA-ICP-MS锆石U-Pb定年结果表明,二郎坪岩体的形成时代为(114.0±0.5)Ma(MSWD=1.5),属于早白垩世晚期。二郎坪岩体富硅、碱和贫钙、镁,属于高钾钙碱性系列;并富集Rb、Th和亏损Nb、Sr、P、Ti,稀土配分模式具有右倾、轻稀土富集、重稀土亏损和负Eu异常的特征,(La/Yb)N范围为8.39~13.73,源区组成和部分熔融程度控制了二郎坪岩体的成分变异。二郎坪岩体形成于厚度约为40 km的地壳内,部分熔融源区位于角闪岩相,源区残余相主要矿物为角闪石和斜长石。烟镇区域岩石圈约在130 Ma经历拆沉作用,触发二郎坪深部的岩浆底侵作用,使源区岩石部分熔融并与之混合,上侵至地壳浅部最终在约114 Ma固结成岩,二郎坪岩体是烟镇区域岩石圈拆沉作用滞后约15 Ma的产物。
中图分类号:
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