北川中泥盆統(tǒng)金寶石組滲濾豆發(fā)育特征及其形成環(huán)境研究
[Abstract]:In this study, the internal structure of percolation bean and the carbon and oxygen isotopic characteristics of the core and the cladding layer of the percolation bean were studied by means of the analysis and test methods of thin rock slice, total organic carbon, carbon and oxygen isotopes, strontium isotopes, X-ray diffraction, trace and rare earth elements, etc. The characteristics of strontium isotope, REE distribution model, core and percolation bean size were studied in depth, and compared with the samples of the surrounding rock of leachate, bifossils in surrounding rock and oolitic limestone of Feixianguan formation, etc. The core and cladding are determined to be the products of different fluid environments in different sedimentary periods. The percolation bean layer at the top of the Devonian gold gem formation in Beichuan is neither a giant oolitic nor a nucleated stone but the result of atmospheric fresh water leaching. The leachate was formed in a weak oxidation-weak reduction transition environment. A large number of GE Wan algae filaments were found in the cladding, and the TOC content in the cladding could reach 0.1, and the organic carbon isotopic values in the cladding showed a great negative bias. It reflects that the formation of leachate is closely related to the activity of microorganism and belongs to the category of microbial rock. The formation of percolation beans requires organic mudstone rich in organic matter containing bioclastic materials, exposed and subjected to atmospheric water leaching, and microbes are surrounded by the growth of bioclastic core. The development of percolation beans in vertical direction has obvious zonation. Close to the exposed surface, the percolation shell became thicker, but away from the exposed surface, the percolation shell gradually thinned or disappeared completely.
【學(xué)位授予單位】:成都理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:P588.248
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