QUERY ON THE NEOCATHAYSIAN FROM THE CONTRAST WITH SICHUAN BASIN AND JIANGHAN SUBSIDENCE AREA
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摘要:
以四川盆地和江汉沉降区作为典型, 剖释华夏系及新华夏系的内涵, 用以探索、研究中国东部的大地构造特征。四川盆地是上叠在上扬子准地台基础上发育起来的晚三叠世-侏罗纪大型坳褶盆地, 是华夏系第三沉降褶带中的一个典型盆地; 而江汉沉降区则是上叠在中扬子褶皱带上发展起来的白垩-第三纪断陷区, 是新华夏系第二断陷带中的一个典型沉降区。两者属于不同世代、不同性质的盆地, 其间存在广泛的构造不整合。李四光所说的新华夏系"三隆"、"三坳", 其实是中国东部乃至东亚地区一个巨型的复合构造区带, 它包括了华夏系及新华夏系的叠置复合。研究结果证明中华夏系不存在, 它是华夏系的变种。为了正确地描述中国东部大地构造的基本特征, 有必要进一步明确华夏系及新华夏系的内在含义。
Abstract:The Sichuan Basin which superimposed on the upper Yangtze Paraplatform during Late Triassic-Jurassic is a large downwarping basin, being a typical basin in the third subsidence zone in Cathaysian.The Jianghan subsidence which superimposed on the fold belt of middle Yangtze during Cretaceous to Tertiary is a rift zone, and is a typical subsidence zone of the second subsidence belt of Neocathaysian. They belong to different basins in time and characteristics, and have extensive structural unconformity. The Neocathaysian three uplifts and three depressions, which put forward by Professor LI Si-guang, is a huge complex tectonic zone, and include stacked composite between Cathaysian and Neocathaysian. The research results prove that the Meso-cathaysian did not exist, for it is just a variation of Cathaysian. In order to correctly describe the basic tectonic characteristics of Eastern China, it's necessary to further clarify the meaning of Cathaysian and Neocathaysian.
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Key words:
- Sichuan Basin /
- Jianghan subsidence zone /
- Eastern China /
- Cathaysian /
- Neocathaysian /
- structural unconformity
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