江西省及邻区滨太平洋构造活动的基本特征

Basic characteristics of the Marina Pacific tectonic activities in Jiangxi Province and its adjacent areas

在研编《江西省区域地质志》、《江西省矿产地质志》与《江西省环境地质志》的基础上,进一步综合研究江西省及邻区滨太平洋构造活动及其与地质资源环境的关系。研究认为:燕山运动时期,古太平洋板块向欧亚板块俯冲并相对强烈左行扭动,东亚陆区处于活化造山环境,形成的新华夏构造体系是滨西太平洋构造活动至今的主体构造。在华南,燕山运动启动于中侏罗世,呈偏心状核幔式扩展。由于岩石圈活化与物质大规模调整,发生了岩浆成矿大爆发,并导致地壳热胀蠕散,形成了复杂的复合动力机制。晚白垩世进入燕山期造山后与喜马拉雅期强烈的伸展成山成盆时期,至古近纪末转变为弱造山活动,地壳趋于相对稳定,构成优越生态地质环境的同时,也带来一些环境地质问题。

During the compilation of The Regional Geology of Jiangxi Province,The Mineral Geology of Jiangxi Province and The Environmental Geological Survey in Jiangxi Province,the authors further studied the tectonic activities of the Marina Pacific Ocean in Jiangxi Province and its adjacent areas and their connection with geological resources and environment.The research suggests that during the Yanshanian movement,terrestrial area in East Asia was in an activated orogenic environment because the Pacific plate subducted towards the Eurasian plate,accompanied with relatively strong sinister twisting,forming a new Cathaysian tectonic system which was the major structure since the Marina Pacific tectonic activity.The Yanshanian Movement of South China began in the middle Jurassic,expanding in the shape of eccentric nucleus.The lithosphere activation and large-scale material adjustment caused the extensive magmatic mineralization and thermal creep movement of the earth’s crust,forming the complex dynamic mechanism.This area entered to Yanshannian post-tectonic period,to mountain-basin forming period due to extensive Himalayan expansion,and then to weak orogenic stage in the Paleogene,until the earth’s crust tended to be relatively stable.All this activities not only constituted the superior ecological-geological environment but brought some environmental geological issues.