论文部分内容阅读
北秦岭主要发育元古宙构造岩石地层单位，包括古元古代秦岭杂岩、中元古代峡河岩群、宽坪岩群和武关岩群、中元古代晚期松树沟蛇绿岩构造岩片、新元古代丹凤岩群和二郎坪岩群的下部地层单位等。北秦岭广泛存在晋宁期的强烈构造－岩浆－变质地质事件，且是新元古代主体形成的古老造山带。晋宁期的地质事件可能并不代表扬子地块和华北地块之间的直接碰撞拼合，而是具扬子地块基底特征的“中秦岭微地块”与北秦岭微地块或华北地块之间的俯冲碰撞拼合。震旦纪之后又逐渐开始发生大陆裂解，进入显生宙的构造演化阶段。新元古代晋宁期（１０００～８００Ｍａ）发生的主要地质事件和有限的俯冲—碰撞拼合及震旦纪之后又逐渐开始发生裂解与国外一些地质学家提出的新元古代时期Ｒｏｄｉｎｉａ超大陆的形成和７００～５７０Ｍａ期间Ｒｏｄｉｎｉａ超大陆的裂解不谋而合。
The North Qinling mainly develops units of Proterozoic tectono-lithostratigraphic units, including the Paleoproterozoic Qinling Complex, the Mesoproterozoic Xiahe Group, the Kuanping Group and the Wuguan Group, the late Paleoproterozoic Songshugou ophiolite structural rocks, Ancient Danfeng Group and Erlangping Group rock formations in the lower unit. The North Qinling widespread Jinning period intense tectonic - magmatic - metamorphic geological events, and the Neoproterozoic ancient orogenic belt. The geological events in the Jinning Period may not represent the direct collision between the Yangtze block and the North China block, but the “mid-Qinling micro-block” with the basement of the Yangtze block and the North Qinling micro-block or the North China block The subduction collision between the split. After the Sinian, the continental cleavage gradually began to enter the tectonic evolution stage of the Phanerozoic. The main geological events of the Neoproterozoic Jinning Period (1000-800 Ma) and the limited subduction-collision assemblage and the beginning of Sinian gradually began to crack and the formation of the Rodinia supercontinent in the Neoproterozoic period proposed by some foreign geologists And the Crack of Rodinia supercontinent during 700-570 Ma coincided.