Geochronology and Petrogenesis of Mylonitized Granite from Wulonggou Area in East Kunlun and Its Tectonic Significance
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摘要: 位于东昆仑中段五龙沟地区深水潭矿段糜棱岩化钾长花岗岩LA-ICP-MS锆石U-Pb年龄为（390±3.9） Ma。该岩体具有较高的SiO2（74.86%~76.64%）、K2O（5.20%~6.06%）和全碱含量（K2O+Na2O=8.05%~8.83%），呈现明显的Ba、Nb-Ta、Sr、P和Ti的负异常，以及强烈的Eu负异常（δEu=0.07~0.12），显示A型花岗岩特征。结合区域上志留纪-泥盆纪岩浆岩的研究，认为东昆仑造山带早泥盆世已进入后碰撞伸展阶段，早中泥盆世之交为伸展最强烈时期，形成了颇具规模的在A型花岗岩，也代表加里东造山旋回的结束。Abstract: The mylonited granite is located at Shenshuitan mining setion of Wulonggou area in the middle part of the East Kunlun, with a yielded LA-ICP-MS zircon U-Pb age of 389.7±3.9Ma. This granite has high SiO2 (74.86%~76.64%), K2O (5.20%~6.06%) and total alkali content (K2O + Na2O=8.05%~8. 83%) values. The samples are characterized by strong loss in Ba, Nb-Ta, Sr, P and Ti, as well as strong negative Eu anomaly (δ Eu=0.07~0.12), which shows characteristics of A type granite. Combined with the studies of Silurian-Devonian magmatic rocks in this studying area, it's proposed that the East Kunlun Orogenic belt has entered the post-collision stage in early Devonian, and the most intense of extension was happened in the conversion period of from early Devonian to middle Devonian, forming A type granite with considerable size, and standing for the end of the Caledonian orogenic cycle.
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