Ophiolitic mélanges in the Kaiyuan Group
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摘要: 岩石化学、地球化学资料表明，中晚元古代开原岩群蛇绿混杂岩由蛇绿岩和岛弧拉斑玄武岩、钙碱玄武岩（斜长角闪岩、角闪石岩）、钙碱性基性—中性火山岩（变粒岩）、陆缘碎屑岩（浅粒岩）组成。蛇绿岩由绿泥滑石片岩（橄榄岩）、角闪岩类岩石（大洋拉斑玄武岩）、石英岩（远洋深海硅质岩）组成。与内蒙古温都尔庙群蛇绿岩，吉林色洛河群同时位于古华北陆块北缘，为陆缘活动带向古华北陆块俯冲形成。这表明古华北陆块北缘造山带在中晚元古代即已出现。Abstract: Petrochemical and geochemical data indicate that ophiolitic melanges in the Middle Late Proterozoic Kaiyuan Group complex are composed of ophiolite, island arc tholeiite, calc alkaline basalt （amphibolite and hornblendite）, calc alkaline basic intermediate volcanic rocks （granulitite） and continental margin clastic rocks （leucogranulitite）. Of them ophiolite consists of chlorite talc schist （peridotite）, amphibolitic rocks （oceanic tholeiite） and quartzite （pelagic cherts）. They are located together with ophiolite of the Ondor Sum Group of Inner Mongolia and the Seluohe Group of Jilin on the northern margin of the North China paleocontinental block .
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