Geochemical Characteristics And Sedimentary Environment Of Ore - Bearing Strata In

Major elements have some tracers to depositional environment, this paper try to use major elements of the sedimentary environment tracing, and comparative and analysis the result are consistent of major elements of the depositional environment and micro elements of the depositional.Yunnan Heqing bauxite is an important mining bauxite resources region in northwest Yunnan, songgui mining is one of the important deposits in Heqing bauxite band. In this paper, we are relying on the "Yunnan Heqing Bauxite Mineralization Law and Prospecting constituency" for selected topic. Through field geological survey, the study found that sedimentary diagenesis and mineralization characteristics fairly obvious, as a special case, selecting group master bauxite area containing the nest ledge as the research object, focusing on analyze sedimentary facies and depositional environment of the area; secondly, the main elements of the main elements in sedimentary environment are analyzed.. Comparative results:The conclusion drawn by using the principle of the principal component tracing is basically consistent with that obtained by trace element tracing.the use of major elements and the use of tracer concluded Trace elements are basically the same conclusions.Thus, the characteristics of sedimentary mineralization environment in the mining area are inferred. And made the following understanding:1.Heqing Songgui bauxite was formed in the western margin of the Yangtze block in Lijiang-the southern belt of Eryuan sag, Affected by the regional tectonic, bauxite ore body occurrence, morphology strictly by the Middle Triassic Series Beiya group at the top of the ups and downs of uneven paleo karst erosion surface pattern control.2.According to the lithologic assemblage, sedimentary structure and the characteristics of the main and trace elements, the mining area is divided into two groups, three sub phases and four microfacies. And aluminiferous rock system mainly developed in the micro facies of tidal marsh, tidal zone and tidal top-tidal zone. Among them, subtidal top intertidal with Heqing loose Guangxi bauxite ore in the most favourable area.3.1n this paper, through the study of the main elements, trace elements and rare earth elements in the deposit geochemical characteristics of the study, we can get the following understanding:①Marine and continental deposits in the discriminant analysis:through the analysis of major elements in M value and K/Na ratio can be launched mining in sea land transitional depositional environment or marine sedimentary environment. Through the analysis of trace elements and Sr elements content and th/u ratios can be launched mining in sea land transitional depositional environment or marine sedimentary environment.② The paleo redox environment discrimination:through the analysis of major elements in Fe2+/Fe3+ and the ratio of Cu/Zn ratio, you can launch a mining area in the oxidizing environment. Based on trace elements in V/Ni, V/(V+Ni) and U/TH and V/Cr ratio analysis, suggesting that mining basic in the oxidizing environment.③Ancient climate discrimination:The major elements of the MgO/CaO, Al2O3/MgO, Fe/Mn and Mg/Ca ratio found in warm and humid climate region. By trace elements Sr element content and Sr/Cu ratio, it is found in warm and humid climate region.④Palaeobathymetry discrimination:Mn/Fe, Zr/Al ratios by major elements can be inferred in the study area in shallow water, near shore areas. By trace elements Sr/Ba, Rb/K ratio, can be speculated that the study area is in shallow water, near shore areas.⑤ Provenance Discrimination:The major elements of Al2O3, TiO2 content and MnO/TiO2 ratio, known as the region’s main terrigenous input. By Ti/Zr, Y/Ni and Cr/Zr ratio of trace elements, it may be in part from land-based sources, may come from another part of the sea of volcanic material.To sum up:the use major elements of high and low and the ratio of the content and the level of the ratio of the size of the size and content of trace elements to determine the area sedimentary environment, both concluded that basically the same. This shows that the use of major elements to be inferred depositional environment of the area.Finally REE characteristics of each facies rocks, indicating the area of bauxite into minerals mainly from tuff volcanic basalt or seawater substance, followed by the underlying limestone.In addition, the region is more obvious negative Eu anomaly rock, suggesting that the area is an oxidizing environment. This is consistent with major and trace elements in this area redox judgment.