The Inclusion Characteristics And Its Geological Siganificances Of Dalingshang Tungsten Ore In Wuning, Jiangxi

The Dahutang tungsten ore, which is newly discovered in Jiujiang of Jiangxi provincein2010, is an extra large tungsten polymetallic deposit of copper and molybdenum. It’sone of the biggest tungsten mines in the world. The successful exploration of the oredeposits would be possible to change the distribution pattern of tungsten ores and ourcountry’s industry layout. Dalingshang tungsten ore locates in the north of theWuningdahutang of the Jiulingcheng ore belt and is an important part of Dahutangtungsten ore. But there are few researches and scientific efforts about the ore deposits.This article explores the evolution and geologic record of hydrothermal fluids aboutDalingshang tungsten ore. The evolution of the hydrothermal fluids formed veins aredivided into three categories and eight types. This article focuses on the characteristics ofthe various veins fluid inclusions. Vein A is rich of Ia type and can rarely see Ib type, itsfluid inclusion’s homogenization temperature is between171.6—453℃, the averagehomogenization temperature is292.5℃, its salinity w(NaCleq) is between9.4%and14.8%,the average is11.9%, the density of vein A fluid inclusion is between0.7399and0.9756g/cm3, the average is0.8383g/cm3, the metallogenic depth of vein A is from0.68to1.46km, the average is1.08km, ore-forming pressure is from20.5to43.8MPa, the averageis32.3MPa. Vein B fluid inclusion is rich in Ia type; its fluid inclusion’s homogenizationtemperature is between186-365.1℃, its salinity w(NaCleq) is between9.4%and14.8%,the average is11.8%, the metallogenic depth of Vein B is from0.76to1.29km, theaverage is0.97km, ore-forming pressure is from20.2to38.7MPa, the average is29.3MPa.Vein D fluid inclusion is rich in Ia type, its fluid inclusion’s homogenization temperature isbetween165.4-412.7℃, the average homogenization temperature is260.8℃, its salinity w(NaCleq) is between3.8%and23.6%, the average is9.5%. The density of vein D fluidinclusion is between0.6257and1.0534g/cm3, the average is0.8727g/cm3. the metallogenic depth of Vein D is from0.37to1.38km, the average is0.84km, ore-formingpressure is from11.2to34.2MPa, the average is25.2MPa. The temperature decreases fromvein A to vein D. The salinity reduces from vein A to vein B. The density increases fromvein A to vein D, while the change between vein B and vein D is not obvious. Themetallogenic depth and ore-forming pressure reduce in turn from vein A to vein D. Mypaper selects some metal minerals, makes a S isotope test, according to analysis about thesulfur isotope, the result of the δ34S test of the main metallogenic epoch concentratesaround zero; the result of the δ34S tests of the pyrite from surrounding rock is about-20‰.It suggests that the source of deposit’s mineralize is single, the degree of homogenizationis high and it comes from granite. The sulfur in the surrounding rock is strong negative andcomes from Shuangqiaoshan metamorphic basement. Based on these geological facts, themetallogenic material from Dalingshang belongs to crustal sources.