吉林大学学报(地球科学版) ›› 2015, Vol. 45 ›› Issue (3): 791-803.doi: 10.13278/j.cnki.jjuese.201503112
郗爱华1, 马艳军1, 葛玉辉2, 唐向阳3, 刘帅1, 徐博文1, 刘珏1
Xi Aihua1, Ma Yanjun1, Ge Yuhui2, Tang Xiangyang3, Liu Shuai1, Xu Bowen1, Liu Jue1
摘要:
大营子岩体位于内蒙古赤峰市西北部,多年来因发现碾子沟钼矿床而广受关注。通过研究发现,大营子花岗岩无论是野外空间产状、岩相特点及含矿性,还是岩石地球化学及同位素年代学特征,内部的黑云母二长花岗岩和边缘的正长花岗岩都存在明显的差异,显示了该岩体实际上是一个多期岩浆侵入的复合岩体。整体上大营子岩体岩石地球化学特征表现为高硅、富铝、富碱、低镁、贫钙的特点,富集大离子亲石元素(LILE)Rb、Th,亏损高场强元素(HFSE)Ti,亏损P元素。稀土元素组成总体含量较高,轻、重稀土分馏明显,Eu负异常显著。其中,边缘相正长花岗岩比中心相黑云母二长花岗岩具有更明显的Eu负异常和较低的微量元素U、Ba和Sr。边缘正长花岗岩锆石U-Pb同位素年龄为(267.6±2.8)Ma, 属于海西-早印支期华北克拉通北缘岩浆作用的产物,形成于造山晚期或后造山伸展作用诱发的下地壳部分熔融,为季家沟钼矿点(床)的赋矿围岩;中心相黑云母二长花岗岩具有(152.4±1.6)Ma的锆石U-Pb年龄,属于燕山期造山后陆内伸展或岩石圈大规模减薄环境岩浆作用的产物,为碾子沟钼矿床的赋矿围岩。
中图分类号:
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