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地质论评  2004 

甘肃玉门地区二叠系――三叠系古地磁研究

Keywords: 二叠系古地磁玉门大山口三叠系

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Abstract:

玉门大山口白杨河一带古地磁研究结果:下二叠统的特征磁化方向为Ds=108.1°,Is=-46.1°;极点位置为λ=30.5°N,ψ=18.6°;古纬度为27.6°N.上二叠统的特征磁化方向为Ds=139.4°,Is=-47.4°;极点位置为λ=54.7N,ψ=359.9°;古纬度为28.2°N;下三叠统的特征磁化方向为Ds=150.8°,Is=-48.1°;极点位置为λ=63.7°N,ψ=351.1°;古纬度为29.1°N.说明二叠纪玉门地区所在的阿拉善地块已是华北地块的一部分,晚二叠世-早三叠世华北地块大体处于吐哈地块和华南地块之间,与俄罗斯地块的古纬度相近;华北、吐鲁番-哈密和塔里木地块都大体位于劳亚大陆的东南部.

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