罗皓,陈国华,舒立旻,舒良树

• 1:南京大学地球科学与工程学院
• 2:江西省地质工程集团
• 3:江西省地矿局912地质大队

摘要(Abstract)：

对华南晚古生代—早中生代地层层序及其岩石组合、早中生代花岗岩特征、构造变形样式等进行了研究,以解决对华南晚古生代—早中生代的地质环境和早中生代构造变形属性一直存在的不同认识。研究表明,发育在赣东北地区的蛇绿岩套,其时代不是晚古生代—早中生代,而是新元古代;新元古代洋壳沉积岩中不存在放射虫,而发育较多的新元古代疑源类。沉积学分析表明,晚古生代—早中生代期间华南为一个向南东倾斜的滨海—浅海沉积环境,广泛发育碳酸盐岩石组合、含放射虫等生物碎屑灰岩、含煤层砂岩和浅海相生物群落,未见同期大规模火山岩分布。早—中三叠世,华南块体发生强烈构造变形和花岗岩浆活动,以朝北西方向运移的褶皱和逆冲推覆为特征,花岗质岩体形成时代集中在245～210Ma,属过铝质花岗岩,不是岛弧型花岗岩。研究表明,早中生代是一个全球规模的构造—岩浆活动期,在此构造背景下,研究区北侧的扬子块体沿大别山断裂带与华北块体发生强烈碰撞,南侧的华夏块体则沿越南马江一带与印支块体碰撞拼贴。受南北两侧此时期碰撞事件的影响,研究区发生了强烈的板内构造—岩浆活动,奠定了华南的基本构造格架。

关键词(KeyWords)： 地层序列;板内构造—岩浆作用;构造变形;晚古生代;早中生代;华南

Abstract:

Keywords:

基金项目(Foundation): 国家重大基础研究973项目(2012CB416701);; 国家自然科学基金项目(No.41272226,40972132);; 内生金属矿床成矿机制研究国家重点实验室项目(2008-I-01)

作者(Author): 罗皓,陈国华,舒立旻,舒良树

DOI: 10.19839/j.cnki.dcxzz.2013.02.008

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