青藏高原泛非—早古生代造山事件研究重大进展——冈底斯地区寒武系和泛非造山不整合的发现
Significant progress on Pan-African and Early Paleozoic orogenic events in Qinghai-Tibet Plateau—discovery of Pan-African orogenic unconformity and Cambrian System in the Gangdise area, Tibet, China
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摘要: 在申扎地区发现了较为完整的寒武纪地层和奥陶系与寒武系之间的“泛非运动”角度不整合。这是迄今为止青藏高原南部发现的唯一确切的寒武纪地层，不但进一步丰富和健全了青藏高原的地层系统，而且也是在青藏高原和周边发现的唯一的下奥陶统与寒武系“泛非运动”角度不整合界面。通过对申扎“泛非运动”界面的研究，可以准确界定“泛非运动”的时限及其动力学过程，也是研究“泛非运动”之前冈瓦纳大陆北缘沉积作用不可替代的标本，对青藏高原构造演化研究具有重要、深远的意义。Abstract: A Pan-African orogenic unconformity between Cambrian and Ordovician and relatively complete Cambrian deposits were discovered in Xainza area, which is the only confessed Cambrian system in southern Qinghai-Tibet Plateau so far. This new discovery is not only an enrichment and complementarity of the stratigraphic system of Qinghai-Tibet Plateau, but also the only Pan-African orogenic unconformity between Cambrian and Ordovician in Qinghai-Tibet Plateau and its surrounding areas. The research on it can accurately determine the time limit of Pan-African movement and its geodynamic evolvement. This unconformity provides an unique sample to the study of the sedimentary process in northern Gondwana before Pan-African movement and has great and far-reaching significances to the research of the tectonic evolvement of Qinghai-Tibet Plateau.
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Keywords:
- Qinghai-Tibet Plateau /
- Xainza area /
- Cambrian System /
- Pan-African movement /
- orogenic unconformity
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