According to their geological, Petrologicaland geochemical characteristics, they are believed to be intracontinental arc - volcanic rocks.
据火山岩的地质 、 岩石学和地球化学特征, 将其确定为陆内弧火山岩.
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The Mesozoic intracontinental orogeny of the Yanshan Mountains developed on a weak zone within the craton.
中生代燕山陆内造山带是在克拉通软弱带上发育起来的.
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