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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。
Based on the previous data of petrology, mineralogy and paleontology - Paleoecology, applying the theory and method of modern sedimentology, through the analysis of the test results of trace elements, ancient salinity and isotope, The lithofacies palaeogeographical features have been comprehensively studied. It is considered that the lower part of the Al-containing rock series deposited in the Datang Period is a marine sediment, and the upper part of the Alluvial Rock belongs to the transitional facies of the sea-land transitional facies, with the top of the continental lacustrine facies sedimentation. It shows that the sedimentary environment of Datang Period is gradually developed into desalination lagoon and formed clay rock sediment in the sediment environment formed in the early stage of transgression. As lagoon desalination degree is strengthened, lagoon area is narrowed and salinity is decreased, and aluminum is formed Rock-bauxite deposits; and finally ended up with organic-rich continental lacustrine deposits. Therefore, tracking the sedimentary sequence of the entire Al-bearing strata along the above-mentioned aorta is a sedimentary product in the process of reeaching.