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地球学报  2004 

“峨眉地幔柱”对扬子板块和塔里木板块离散的作用及其找矿意义

Keywords: 扬子板块,塔里木板块,峨眉地幔柱,峨眉地裂运动,兴凯地裂运动

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Abstract:

扬子板块与塔里木板块,目前直线相距约1900km(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;研究二叠纪末一三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。

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