柞水縣楊木溝斑巖型鉬礦圍巖蝕變特征研究
[Abstract]:As one of the important characteristics of porphyry molybdenum deposit, altered surrounding rock is paid more attention by scholars. The physicochemical conditions and hydrothermal properties of the altered surrounding rock provide strong evidence for the inference of the evolution of the deposit, the migration and enrichment of ore-forming elements, the deposit of ore and the enrichment of ore-forming theory. At the same time, altered rock can also be used as an important prospecting marker. This paper takes Yangmugou molybdenum deposit in Zhashui County, Shaanxi Province as the object of study. On the basis of geological data collection, field geological investigation and ore system sampling, indoor identification is carried out by means of reflective microscope. By means of modern geological analysis, such as electron probe analysis and rock geochemistry test, the data of chemical composition of alteration minerals, geochemistry of major elements and geochemistry of trace elements are obtained, and the alteration types and alteration zones of the deposits are determined. The occurrence environment of alteration events and the mineralized phenomena caused by them are found out, the prospecting criteria are summarized, and the genesis of the deposits is analyzed. The results show that the alteration types of surrounding rock of Yangmugou porphyry molybdenum deposit are mainly silicification, potassium feldspar, biotite, sericite, greenstone, mudstone, mudstone and qinwanglitization. Molybdenum mineralization is most closely related to silicification and potassium feldspar. The mineralization phenomenon is obviously controlled by geological structure. The orebody is mainly concentrated between fl and f2 structural alteration zone and its adjacent upper and lower plates, and is consistent with the occurrence of tectonic zone. The high content of Si,K in altered minerals indicates that the enrichment anomaly of Mo is closely related to quartz veins. In the process of hydrothermal intrusion, Cu,Zn,Ni,Co,V, Nb,Sc,Ba and other elements are taken out, and elements such as Pb,Ag,Hf,Zr are brought in, which indicates that the alteration of surrounding rock occurs in different temperature environments. In the 未 Eu-Sr diagram, it is found that the heat flux caused by wall rock alteration in the mining area mainly comes from the crust source, but is also slightly affected by the mantle source. The surface negative topography, quartz vein and limonite mineralization zone can be used as direct prospecting markers.
【學(xué)位授予單位】:西安科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:P618.65
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