The Study Of Mineralogy And Geochronology Of The Late Jurassic Epoch Ore-bearing Granites In Dahutang Shimensi Tungsten

Shimensi as a world class tungsten ore wolframite- One of the North Dahutang tungsten ore field, which is located in Jiangxi Province Wuning County Jiuling metallogenic belt of the western part. This paper selects Shimensi Mine Late Jurassic granites containing ore as the main research object, the school and the main ore-bearing rock-forming minerals of granite’s features, and discusses its diagenetic metallogenic significance.Shimensi Mine ore Late Jurassic include, porphyritic granite, porphyry granite porphyry and granitic-porphyry. Their diagenetic ages of 166.6 ± 2Ma, 163.3 ± 4.6Ma and 154.3 ± 5Ma. Three ore-bearing biotite granite are euhedral- subhedral native biotite, with rich aluminum, iron-rich, high-titanium, magnesium poor characteristics. Alkali feldspars are orthoclase, porphyritic granite to and from more spots porphyry, granite porphyry and then, from there alkali feldspar orthoclase orthoclase changes to sodium trend, reflecting the lava from early evening sodium content tended to increase. Three ore-bearing granite porphyry and porphyritic granite in almost all plagioclase albite, show more spots porphyry magma neutral in acidic magmatic rocks. Three ore-bearing biotite granite host rocks show the same characteristics belong SPGs, source rocks from the earth’s crust, ore-bearing porphyritic granite and ore-bearing biotite granite porphyry is consistent with South Reformed biotite granite, multi-spot biotite porphyry-type granites transformation between nearby South China and South-acting with biotite granite boundary, indicating that there may be more spots granite porphyry south syntexis type granite magma mixing. Three ore-bearing granites are falling between the Ni-NiO buffer line Fe2SiO4-SiO2-Fe3O4 buffer line, shows low oxygen fugacity of magma. Hypoxic environment conducive to the fugacity in magma system tungsten mineralization enrichment, reflecting Shimensi three ore-bearing granites are conducive to the formation of tungsten ore. Rich source of tungsten metal in the earth’s crust was formed a tungsten-containing high crustal magma, magma low oxygen fugacity in favor of tungsten metal enriched magma in magma late tungsten metal exsolution from the magma mineralization in rock inside and outside the contact zone mineralization...