摘要
针对环太平洋构造域演化对东北地区影响这一重要科学问题,运用洋—陆转换及大陆动力学等理论,结合最新研究成果,通过系统分析佳木斯—兴凯地块东缘晚石炭世—晚侏罗世完达山俯冲增生杂岩带的物质组成,甄别了俯冲增生杂岩带内蛇绿岩的类型。研究表明:晚石炭世—晚侏罗世完达山俯冲增生杂岩带可划分为晚石炭世—晚三叠世跃进山俯冲增生杂岩和中三叠世—晚侏罗世饶河俯冲增生杂岩2个部分。晚石炭世—晚三叠世跃进山俯冲增生杂岩中蛇绿岩类型包括:SSZ型蛇绿岩—前弧富铌玄武岩,洋中脊型蛇绿岩—洋中脊绿片岩,地幔柱型蛇绿岩—海山绿片岩,与弧盆地演化相关蛇绿岩—超镁铁质岩、辉长岩组合。中三叠世—晚侏罗世饶河俯冲增生杂岩中蛇绿岩类型主要包括洋中脊型蛇绿岩—洋中脊玄武岩,地幔柱型蛇绿岩—洋岛超镁铁质岩、辉长岩、玄武岩组合。通过对晚石炭世—晚侏罗世完达山俯冲增生杂岩带物质组成和各期岩浆弧、区域磨拉石建造空间分布的概括分析,总结了佳木斯—兴凯地块东缘早泥盆世—晚白垩世早期洋—陆转换过程。
Aiming at the important scientific issue of the impact of the evolution of the Pacific Rim tectonic domain on the Northeast region,using theories of ocean-continent transition and continental dynamics,combined with the latest research results,through a systematic analysis of the Late Carboniferous-Late Jurassic on the eastern margin of the Jiamusi-Xingkai block.The material composition of the Luoshi Wandashan subduction and accretionary complex zone discriminates the types of ophiolite in the subduction accretionary complex zone.Research shows that the Late Carboniferous-Late Jurassic Wandashan subduction accretion complex can be divided into the Late Carboniferous-Late Triassic Yuejinshan subduction accretion complex and the Middle Triassic-Late Jurassic Raohe subduction accretion.Two parts of the complex.The types of ophiolite in the Late Carboniferous-Late Triassic Yuejinshan subduction accretion complex mainly include SSZ-type ophiolitefore-arc niobium-rich basalt,mid-ocean ridge-type ophiolite-mid-ocean ridge green schist,mantle plume-type ophiolite Greenstone-seamount greenschist,an ophiolite-ultramafic rock and gabbro combination related to arc basin evolution.The types of ophiolite in the Middle Triassic-Late Jurassic Raohe subduction accretionary complex include:mid-ocean ridge-type ophiolite-mid-ocean ridge basalt,mantle plume-type ophiolite-ocean island ultramafic rock,Combination of gabbro and basalt.Based on the general analysis of the material composition of the Late Carboniferous-Late Jurassic Wandashan subduction accretion complex belt and the spatial distribution of magmatic arcs and regional molasses,the author summarized the early mud in the eastern margin of the Jiamusi-Xingkai block Basin-Early Late Cretaceous Ocean-Continent Transition Process.
作者
张铁安
高洪岩
赵雨生
刘宇崴
杜兵盈
刘宇奇
ZHANG Tiean;GAO Hongyan;ZHAO Yusheng;LIU Yuwei;DU Bingying;LIU Yuqi(Heilongjiang Geological Science Institute)
出处
《现代矿业》
CAS
2021年第5期21-27,32,共8页
Modern Mining
基金
中国地质调查局地质调查子项目(编号:12120114033501)。
关键词
洋—陆转换
俯冲增生杂岩
构造演化
ocean-land transformation
subduction-accretionary complex
tectonic evolution
