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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: Paleoproterozoic Hwanghae Group and granites were developed in Ongjin area, southwestern part of the Pyongnam Basin, Korean Peninsula. The granites intruded into the Hwanghae Group. We obtained zircon LA-ICP-MS U-Pb isotopic data of four samples from two felsic volcanic rocks from Hwanghae Group and two representative granitic intrusions to determine their formation ages. New zircon U-Pb ages indicate that the felsic volcanic rocks located in lower and upper layer of Hwanghae Group were erupted in 1235±5Ma and 1203±7Ma, respectively, which suggest that the deposition age of the Hwanghae Group was Mesoproterozoic, not the traditional thought of Paleoproterozoic. Two granite plutons, Ongjin and Hwangyuisan, emplaced at 1251Ma and 1246Ma, respectively. The magmatism time around 1251~1203Ma obtained in this study demonstrates the development of Mesoproterozoic magmatism on the Korean Peninsula. It indicates that Hwanghae rift has concurrent evolution history with the Eastern Marginal Rift of North China Craton.
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Key words:
- Korean Peninsula /
- Pyongnam Basin /
- Mesoproterozoic granites /
- Hwanghae Group /
- Mesoproterozoic
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