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地质论评  2004 

“承德逆掩片”之商榷――来自燕山地区中元古代长城系的沉积地质证据

Keywords: 元古代推覆构造断裂带沉积相

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Abstract:

外来岩片不但在构造变形上应具有显著的特征标志,而且在其卷入的各类地质体中也应该表现出与原地系统之间具有明显的差异.近年来,承德地区两条断裂之间所夹地质体,被部分学者认为是晚侏罗世时期从该地区南部向北推覆而来的"逆掩片",水平位移量超过40km.本文对比研究了"逆掩片"内部和"根带区"中元古代长城系原始沉积特征和相带展布以及其他证据,发现承德地区长城系各相带原始展布和格局与周边同期沉积并无显著差别,这表明晚侏罗世期间发生自南向北大规模水平位移(>40km)的可能性很小,研究结果不支持"外来岩片"的认识.

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