吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (2): 497-510.doi: 10.13278/j.cnki.jjuese.201702114
刘锦1,2, 刘正宏1, 赵辰2, 彭游博2, 王楚杰3, 杨仲杰2, 豆世勇2
Liu Jin1,2, Liu Zhenghong1, Zhao Chen2, Peng Youbo2, Wang Chujie3, Yang Zhongjie2, Dou Shiyong2
摘要: 通过详实的地质填图,在辽宁开原地区清河断裂以北新发现一套变质表壳岩组合,主要岩性为斜长角闪岩、黑云角闪斜长变粒岩、黑云角闪斜长片麻岩、浅粒岩及角闪石岩的岩石组合,与红透山岩组基本可以对比。岩石地球化学特征表明,其原岩主要为一套中、中基性的火山岩建造,形成于岛弧环境。该套岩石组合普遍发生强烈的构造变形作用,常见构造样式包括透入性片麻理、石香肠构造、变质分异条带、肠状褶皱等一系列的固态流变构造。对该套变质表壳岩组合中的斜长角闪岩进行LA-ICP-MS锆石U-Pb测年,结果表明其形成于(2 524±18)Ma,变质年龄为(2 477±21)Ma,从形成到发生变质相隔约为47 Ma。该套变质表壳岩组合的发现,表明了清河断裂以北也曾存在太古宙结晶基底,清河断裂与寇河断裂之间的区域在构造环境上与清原地区一样,均属于新太古代绿岩带。
中图分类号:
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