东北亚早中生代火成岩组合的时空变异:对古太平洋板块俯冲开始时间的制约

发布时间：2018-05-18 23:43

本文选题：东北亚 + 早中生代　；参考：《矿物岩石地球化学通报》2016年06期

【摘要】：本文系统总结了东北亚早中生代火成岩的岩石组合及其空间变异,讨论了古太平洋板块向欧亚大陆下俯冲作用开始的时间和早中生代岩浆作用与古亚洲洋构造体系、蒙古-鄂霍茨克构造体系以及扬子与华北克拉通俯冲碰撞作用之间的关系。东北亚早中生代岩浆作用划分成3期:早-中三叠世、晚三叠世和早侏罗世。额尔古纳地块上早中生代钙碱性岩浆作用揭示了蒙古-鄂霍茨克大洋板块南向俯冲作用的发生;华北克拉通北缘三叠纪碱性和双峰式岩浆作用揭示了古亚洲洋最终闭合后的伸展环境;吉黑东部晚三叠世A型流纹岩、双峰式岩浆作用与稳定陆缘沉积一起暗示了伸展环境和被动陆缘背景,而早侏罗世钙碱性岩浆作用及其成分极性与陆缘增生杂岩一起揭示了古太平洋板块向欧亚大陆下俯冲作用的开始。
[Abstract]:This paper systematically summarizes the rock assemblages and their spatial variations of the early Mesozoic igneous rocks in Northeast Asia, and discusses the time when the paleo-Pacific plate subducted to Eurasia, the early Mesozoic magmatism and the paleo-Asian ocean tectonic system. Mongolia-Okhotsk tectonic system and the relation between Yangtze and North China Craton subduction collision. The early Mesozoic magmatism in Northeast Asia can be divided into three periods: early and Middle Triassic, late Triassic and early Jurassic. The early Mesozoic calc-alkaline magmatism in the Erguna massif reveals the occurrence of the southward subduction of the Mongolia-Okhotsk oceanic plate. The Triassic alkaline and bimodal magmatism in the northern margin of the North China Craton revealed the extensional environment after the final closure of the Paleo-Asian Ocean. Bimodal magmatism, along with stable continental margin deposits, implies an extensional environment and a passive margin background. The early Jurassic calc-alkaline magmatism and its composition polarity together with the continental margin accretive complex revealed the beginning of the subduction of the paleo-Pacific plate to the Eurasian continent.
【作者单位】：吉林大学地球科学学院;
【基金】：国家自然科学基金项目(41330206) 中国地质调查局地质调查项目(12120113098300,12120114085401)
【分类号】：P588.1;P542

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