湖南塔山岩体岩石学、地球化学、U-Pb年代学特征及其形成构造背景Petrological,Geochemical,and U-Pb Geochronological Characteristics and Tectonic Setting of Tashan Pluton Formation in Hunan Province
杜云;罗小亚;黄革非;田磊;王敬元;
摘要(Abstract):
塔山岩体处于阳明山-塔山-大义山东西向构造—岩浆带中部,是南岭成矿带的重要组成部分,出露面积约200km~2。该岩体为岩浆多期次侵入形成的中深成复式岩体,整体剥蚀程度较低,可划分为5个侵入期次,从早期到晚期,各侵入期次岩体的岩石学及重矿物特征呈现出规律性变化。塔山岩体富硅、富铝,属铝过饱和钙碱性酸性花岗岩类,其Ba、Nb、Sr、P、Ti显著亏损,并具有明显的铕负异常及轻稀土元素分馏明显而重稀土元素分馏不明显的特征。塔山岩体第2侵入期次和第3侵入期次岩体的SHRIMP锆石U-Pb同位素年龄分别为(218±3)Ma和(215±3)Ma,属于晚三叠世。岩石学、地球化学特征表明塔山岩体为地壳部分熔融形成的S型花岗岩,源岩主要为上地壳泥质岩石。微量元素和稀土元素特征显示岩浆形成与板内挤压造山运动停止时挤压剪切应力释放导致的压力下降、岩石升温、熔点降低有关,岩浆成岩过程既受部分熔融也受分离结晶作用控制。地球化学判别显示塔山岩体为印支晚期伸展构造环境下形成的后碰撞花岗岩。
关键词(KeyWords): 岩石学;地球化学;U-Pb年代学;构造背景;塔山岩体;印支期;湖南省
基金项目(Foundation): 中国地质调查局地质调查子项目“湖南上堡地区矿产远景调查”(1212011120809);“湖南苗儿山地区矿产地质调查”(12120114024201)及其所属的二级项目“南岭成矿带地质矿产调查”(121201009000150002)
作者(Author): 杜云;罗小亚;黄革非;田磊;王敬元;
Email:
DOI: 10.19509/j.cnki.dzkq.2017.0606
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