湘中白马山复式岩体成因及其成矿效应(9)
5 结论
(1)白马山岩体是一个复式花岗质侵入体,水车超单元形成于424.,为加里东期岩浆活动产物;龙潭超单元形成于228.、小沙江超单元形成于225.和217.之间、龙藏湾超单元形成于215.,均为印支晚期岩浆活动的产物。
(2)龙潭和小沙江超单元花岗岩主要由华南古元古代上地壳中变质中基性火成岩混有部分沉积岩发生部分熔融形成,具有I型或I-S过渡型花岗岩的特征;而龙藏湾超单元主要由华南古元古代上地壳变泥质岩发生部分熔融形成,是典型S型花岗岩。白马山复式岩体印支期花岗岩可能是华南板块受印支板块碰撞挤压后地壳发生伸展减薄背景下形成的。
(3)白马山复式岩体中印支期花岗岩在时间、空间上与周缘的金、钨矿床基本一致,暗示其具有良好的成矿潜力,与金、钨矿床可能具有内在的成因联系。
致谢本文实验测试和分析过程中得到中南大学地球科学与信息物理学院张德贤老师、南京聚谱检测科技有限责任公司李亮老师、中国科学院地球化学研究所黄金川博士的热心帮助,在此表示衷心的感谢!感谢审稿专家提出的宝贵修改意见!
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