朝鲜半岛平南盆地中元古代岩浆事件

发布时间：2018-12-09 14:59

【摘要】：朝鲜平南盆地翁津地区发育中元古代黄海群和同时期(称之为瓮津期)花岗岩,花岗岩体侵入于黄海群。本文采用锆石原位微区U-Pb定年技术,对黄海群中的酸性火山岩及花岗岩进行了年龄测试。获得的数据表明,黄海群中下部层位及上部层位的酸性火山岩分别在1235±5Ma和1203±7Ma喷发,由此说明黄海群的沉积时代应为中元古代,而不是传统上认为的古元古代;两个翁津期花岗岩体(翁津和黄衣山岩体)的侵位年龄分别为1251±22Ma和1248±13Ma,为中元古代花岗质岩浆活动的产物。上述1251~1203Ma年龄的获得,表明朝鲜半岛发育中元古代岩浆作用,从而明确朝鲜黄海裂谷与华北东缘裂谷在时间上具有同期性,同时也表明中国华北与朝鲜在中元古代具有类似的发展历史。
[Abstract]:Mesoproterozoic Huang Hai group and synchronal granite (Wengjin period) developed in Wengjin area, Pingnan Basin, Korea. The granites intruded into Huang Hai group. In this paper, zircon in situ U-Pb dating technique has been used to determine the age of acid volcanic rocks and granites in Huang Hai group. The obtained data show that the acid volcanic rocks of the lower and upper layers of Huang Hai group erupt at 1235 卤5Ma and 1203 卤7Ma, respectively, which indicates that the sedimentary age of Huang Hai group should be Mesoproterozoic, rather than the Paleoproterozoic as traditionally thought. The emplacement ages of two Wengjin granitic bodies (Wengjin and Huangyishan pluton) are 1251 卤22Ma and 1248 卤13 Marespectively, which are the products of Mesoproterozoic granitic magmatism. The above 1251~1203Ma age indicates that the Proterozoic magmatism developed on the Korean Peninsula, so that it is clear that the rift between Huang Hai Valley and the eastern margin of North China has a synchronism in time. It also shows that North China and North Korea have similar development history in Middle Proterozoic.
【作者单位】：朝鲜国家科学院地质研究所;中国科学院地质与地球物理研究所;中国科学院计算地球动力学重点实验室中国科学院大学地球科学学院;
【基金】：重大国际合作项目(41210003)资助
【分类号】：P534.3

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