Characteristics of Lithofacies Paleogeography During Datangian Age Early Carboniferous) in Xifeng and Zunyi, Guizhou
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摘要: 在前人取得岩石学、矿物学及古生物—古生态学实际资料的基础上，应用现代沉积学的理论与方法，通过指相微量元素、古盐度及同位素等测试成果分析，对大塘期岩相古地理特征进行了综合研究。认为大塘期沉积的含铝岩系下段粘土岩属海相沉积，上段铝质岩属海陆过渡相沉积，顶部为大陆湖沼相沉积。表明大塘期的沉积环境，是在海侵早期所形成的陆表海基础上，逐步发展成淡化泻湖形成粘土岩沉积，随着泻湖淡化程度的强化，泻湖范围缩小，盐度降低，进而形成铝质岩—铝土矿沉积；最后以富有机质的大陆湖沼相沉积而告终。因此，沿上述脉络追踪整个含铝岩系的沉积序列，当属海退过程中的沉积产物。Abstract: Based on the data of petrology, mineralogy and paleontology, this paper uses the theory and ways of modern sedimentology, analyzes the test result of microelement, paleosalinity and isotope to research lithofacies paleogeography of Datangian age. The result shows that the clay stone is marine facies deposit in the lower part of aluminum bearing formation; in the upper part, aluminous rock is transitional facies deposit, and the top is continent lakes and marshes facies deposit. It suggests that sedimentary environment of Datangian Age be the base of epicontinental sea which occur during early transgression period and work up to the lagoon and form clay stone deposit, with the aggrandizement of desalination, the lagoon become small, the salinity is reduced to form aluminous rock, at last, it is end with lakes and marshes deposit. Therefore, tracing deposit sequence of aluminum bearing formation, the author believes that aluminum ore is the sediment of marine regression.
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