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地质学报  2001 

扬子地块泥盆纪―石炭纪古地磁新结果及其古地地理意义

, PP. 303-313

Keywords: 扬子地块泥盆纪-石炭纪古地磁冈瓦那大陆地层构造极移曲线

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Abstract:

本文通过对扬子地块西南缘贵州独山-平塘地区泥盆-石炭纪316块定向岩心样品的系统退磁处理,揭示出晚侏罗世、新生代两期重磁化成.73个岩心样品,分布在早一中泥盆世(17个)、晚泥盆世(25个)、早石炭世(24个)和中-晚石炭世(7个)4个统计单元,得到了最可能的原生剩磁。结合已有的古地磁数据,修订了扬子地块极移曲,纯利移曲线拟合的结果表明,扬子地块在早古生代是冈瓦那大陆的组成部分,与印度-喜马拉雅-澳大利亚地区临近。晚泥盆世、冈瓦那大陆发生大规模顺时针旋转,扬子地块开始与之分离。

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