LA-ICP-MS Zircon U-Pb Dating of Xinchong Syenogranite in Southwestern Fujian and Its Prospecting Significance
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DOI: 10.12677/ag.2017.73038
Abstract: 新冲正长花岗岩位于胡坊复式岩体东南缘，总体呈南西向展布，出露面积大于200 km2，岩性为肉红色斑状粗粒正长花岗岩。本文对新冲正长花岗岩样品进行了LA-ICP-MS锆石U-Pb测年，获得206U/236Pb加权平均年龄为222.0 ± 1.0 Ma (n = 24，MSWD = 0.53)，表明新冲正长花岗岩侵位时代为晚三叠世，是印支运动晚期岩浆活动的产物。通过对比，新冲正长花岗岩的侵位时代晚于志留纪侵位的胡坊花岗岩，表明胡坊复式花岗岩为志留纪和三叠纪岩浆活动的产物。对新冲正长花岗岩稀土元素分析，显示新冲正长花岗岩稀土总量较高，富集轻稀土元素La、Ce，具有寻找离子吸附型稀土矿的良好找矿前景，这对闽西南地区岩浆演化和找矿提供了重要新资料。 The Xinchong syenogranite is located at the southeastern portion of the Hufang Compound granite, which is mainly composed of meat red patchy, coarse-grained syenogranite, generally… read more here.
Keywords: icp zircon; xinchong syenogranite; syenogranite southwestern; dating xinchong ... See more keywords