Study On Evolution And Metallogenesis Of Granite Slurry In Dengfeng Tungsten Mine, Hunan Province

Hunan Xiangdong tungsten also known as Deng Fuxian tungsten, located at about40km in the northeastern Hunan province ChaLing county. Deng Fuxian tungsten in the north eastern of Nanling metallogenic belt, deposit hosted in Deng Fuxian granitic.Proved resources is35334tDeng Fuxian tungsten mine development Indosinian coarse porphyritic biotite granite, Yanshanian medium-grained porphyritic muscovite and biotite granite and fine-grained alkali feldspar granite. Among them, the quartz vein tungsten ore is about Yanshanian medium-grained porphyritic muscovite; niobium-tantalum ore is about Yanshanian fine-grained alkali feldspar granite.In the Yanshanian medium-grained porphyritic muscovite, found in granite in the total output of about0.1km2augen, ribbon flow structure.It is show that focuses on the ore-forming geological body of quartz vein type wolframite deposit in Deng Fuxian.Sampling to the flow structure of augen and the flow structure of stripped, the samples and the detailed analysis of the rock ore appraisal and testing work, clear structure, mineral composition and content change of characteristic. On this basis, study of the main mineral of the sample (such as feldspar, mica) electron microprobe analysis, rock main trace element geochemical analysis, as well as fluid inclusion studies, summarized its origin cause of formation and enrichment of ore-forming elements in the process, as well as to the tungsten deposit metallogenic mechanism of instruction meaning.Through the geological and geochemical study of the flow structure of augen and the flow structure of stripped, a few things were made clear:(1) Deng Fuxian granite for the system of the petrography, geological and geochemical and electron probe test, reclassify the accurate name of three kinds of granite; the Dengfuxian granitic body is composed of Indosinian coarse porphyritic biotite granite, Yanshanian medium-grained porphyritic muscovite and biotite granite and fine-grained alkali feldspar granite. Granite reclassify to guide Deng Fuxian tungsten ore prospecting work in the future is of great significance.(2) The flow structure of augen or the flow structure of stripped distributed in medium grained porphyritic mica granite, and the granite boundaries clear, granite rock mass has no obvious alteration. Through the integrated analysis of petrography, mineragraphy, the electron probe analysis of compositional characteristics of major minerals, major trace element geochemical characteristics, rare-earth element geochemical characteristics and fluid inclusion of the flow structure of augen or the flow structure of stripped, it is concluded that the flow structure of augen or the flow structure of stripped formed by the combination of magma and hydrothermal, is between magmatic hydrothermal also a transient fluid slurry liquid evolution differentiation. The geological features of the flow structure of augen or the flow structure of stripped show it as the result of the liquid magma evolution differentiation;(3) The flow structure of augen or the flow structure of stripped of the mineral composition and fluid inclusion characteristics similar to those of the wolframite quartz veins, wolframite quartz veins and the flow structure of augen or the flow structure of stripped has a close genetic relation. The flow structure of augen or the flow structure of stripped represented by the further evolution of the transient fluid slurry, volatile and enrichment of ore-forming materials further hydrothermal stage, eventually forming the wolframite quartz veins. The mineralization of the type of Quartz vein tungsten from late magmatic has already started, continue to magmatic hydrothermal stage after stage, quartz vein type tungsten deposit and is not only the traditionally after period of magmatic hydrothermal deposit.