摘要
扬子板块与塔里木板块 ,目前直线相距约 190 0km(且末与成都间距离 ) ,但国内许多地学工作者从古生物群和沉积相的相似性 ,认为早古生代两板块相连或相距不远。本文从中国古生代板块构造演化史中出现的“兴凯地裂运动”和“峨眉地裂运动” ,论述扬子板块和塔里木板块离散和汇聚中的运动学特征 ,从“峨眉地幔柱”理论阐述扬子板块向东漂移的动力学机制。扬子板块在二叠纪与塔里木板块离散并向东漂移的论断若能成立 ,则为古特提斯在中国境内首先打开提供依据 ;对全球一些地方 (俄罗斯的通古斯、印度的潘加尔 )二叠纪玄武岩大面积同时喷发有重大的地球动力学理论意义 ;研究二叠纪末 三叠纪初生物大绝灭事件具有重要作用 ;还可在阿尔金地块及其邻区找到攀枝花式的钒、钛磁铁矿及铜、镍、铂等金属矿床 ,对比四川盆地二叠系生物礁块气藏成藏条件 ,对塔里木盆地油气藏生成、运聚和保存等条件以及在下古生界寻找大油气田 ,均有启示作用。
The present straight distance between the Yangtze plate and the Tarim plate(from Qiemo to Chengdu),is 1 900 km. Nevertheless,many geologists hold that these two plates are connected with or not far from each other according to the comparability of fauna, flora and sedimentary faces of the Early Paleozoic. This is a complicated problem that various geologists are interested in. This paper discusses the kinematic features of separation and congregation of theYangtze plate and the Tarim plate from “Emei taphrogeny” and “Xingkai taphrogeny” in the Paleozoic tectonic plate evolutionary history of China, and deals withthe kinetic mechanism of the Yangtze plate′s eastward migration on the basisof “Emei mantle plume” theory. If the hypothesis that the Yangtze plate was separated from the Tarim plate and migrated eastward in the Permian can hold,it can serve as evidence for the first opening of Paleo-Tethys in China. It isof great geological significance in the study of extensive eruption of Permian basalts in some areas of Russia and India. The action must also have played an important role in the mass extinction during the Late Permian and early Triassic. With this theory, the Panzhihua type V, Ti magnetite deposits and Cu, Ni and Pt deposits may be found in the Altun and adjacent area. A comparison withthe Permian organic reef gas reservoirs in Sichuan is also helpful to the study of the hydrocarbon generationand migration in Tarim basin as well as to the prospecting for large petroleumfields there.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2004年第5期515-522,共8页
Acta Geoscientica Sinica
关键词
地幔柱
扬子板块
塔里木板块
离散作用
Paleo-Yangtze plate Paleo-Tarim plate Emei mantle plume Emei taphrogeny Xingkai taphrogeny
