豫西地区构造演化与上三叠统地层保存和分布

豫西地区主要发育有东西向、北西向和北东向三组断裂，分别为印支—燕山早中期、燕山晚期和喜山期构造运动的产物。这三组断裂控制着盆地边界和盆地内的局部构造，并对上三叠统地层的剥蚀也有一定的控制作用，尤其是硖石—陈宅沟、硖石—石门断裂对上三叠统地层的保存影响较大。在其下盘，上三叠统地层保存良好，在其上盘即推覆体上，上三叠统地层往往遭受严重剥蚀。上三叠统地层主要分布在伊川盆地彭婆凹陷、洛阳盆地的洛阳凹陷和宜阳凹陷石陵次凹，其他地区三叠系地层剥蚀殆尽．

Tectonic Evolution and Upper Triassic Distribution in the Western Henan

Three eastwest,northwest and northeast trending Fault groups developed in the Western Henan as a result of structural movements during Indo - Chinese and early to middle Yanshan, late Yanshan, and Himalayan epochs respectively.They control the basin's boundary and local structures, and also control, to a certain degree, the denudation of the Upper Triassic. Xiashi - Chenzhaigou and Xiashi -shimen faults have relative large influence on the preservation of the Upper Triassic, which is well preserved in the lower blocks and is severely eroded in the upper thrust blocks. The Upper Triassic mainly distributs over the Pengpo Seg in the Yichuan Basin,and over the Louyang Seg and the Shilingci subseg of the Yiyang Seg in the Louyang Basin, while it is almost completely eroded in other areas.