【摘 要】
：
通过岩石学、岩石化学、地球化学和同位素的研究 ,作者认为北京西山东岭台组火山岩的主要起源于下地壳上部岩石的部分熔融 ;火山岩形成的构造背景为陆内造山带的拉张环境 ,与
【机 构】
：
中国科学院广州地球化学研究所!广州510640,长安大学地球科学系,西安710054,中国地质大学地球科学学院!武汉430074,中国地质大学地质系!北京100029,中国地质大学地质系!北京1000
论文部分内容阅读
通过岩石学、岩石化学、地球化学和同位素的研究 ,作者认为北京西山东岭台组火山岩的主要起源于下地壳上部岩石的部分熔融 ;火山岩形成的构造背景为陆内造山带的拉张环境 ,与中生代古太平洋板块向亚洲板块斜向板块俯冲没有直接关系 ;由于晚侏罗世 -早白垩世燕山地区处于拉张状态 ,造成上地幔上部岩石的部分熔融 ,引起玄武岩浆的底侵和中侵作用促使下地壳岩石发生部分熔融形成了东岭台组火山岩岩浆
Based on the study of petrology, petrochemistry, geochemistry and isotope, the authors believe that the volcanic rocks of the Donglingtai Formation in the Xishan Mountains of Beijing mainly originate from the partial melting of the rocks in the upper part of the lower crust. The tectonic setting of the volcanic rocks is the extensional environment of the intracontinental orogenic belt, It is not directly related to the subduction of the Paleo-Pacific plate to the slab of the Asian plate in the Mesozoic. Since the late Jurras-Early Cretaceous Yanshan area was in tension, part of the upper mantle upper part of the rocks was melted, causing the basaltic magmas to invade and invade The role of the lower crust led to the partial melting of the rocks to form the Donglingtai volcanic magma
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