摘要
The Lianhuashan porphyry tungsten deposit occurs in the coastal area of southeast China, where volcanic rocks are extensively developed. The history of regional geology is related to the Benioff belt along the west Pacific Ocean during Mesozoic. Alteration-mineralization is genetically connected with quartz porphyry of Upper Jurassic age. The isochron age of the quartz porphyry was estimated to be (135.8±7.3--137.8±2.4)×10^6 yr, with an initial strontium ratio of 0.70668±0.00038. From the quartz porphyry outwards, there are developed alteration zones in the order: potash-alteration, phyllitization and propylitization. Tungsten mineralization occurs in the phyllitized zone. The mineral association is characterized by the paragenesis of wolframite with scheelite, and high sulfides, especially pyrite, pyrrihotite and arsonopyrite. Stable isotope data are presented as follows:δ^34S=-0.3-+4.1‰,δ^18O=+0.6-6.8‰,and D=-6.8--46.8‰. Evidence developed from fluid inclusions indicates that the temperature of altera tion-mineralization ranges from 650° to 150℃. Ore fluids are high in salinity and richin Cl. The geological-geochemical characteristics of the deposit permit a conclusion that the studied deposit is a porphyry-tungsten deposit.
The Lianhuashan porphyry tungsten deposit occurs in the coastal area of southeastChina, where volcanic rocks are extensively developed. The history of regional geologyis related to the Benioff belt along the west Pacific Ocean during Mesozoic. Alteration-mineralization is genetically connected with quartz porphyry of UpperJurassic age. The isochron age of the quartz porphyry was estimated to be (135.8±7.3-137.8±2.4)×10~6 yr, with an initial strontium ratio of 0.70668±0.00038. From the quartz porphyry outwards, there are developed alteration zones in theorder: potash-alteration, phyllitization and propylitization. Tungsten mineralizationoccurs in the phyllitized zone. The mineral association is characterized by the paragenesis of wolframite with sch-eelite, and high sulfides, especially pyrite, pyrrihotite and arsenopyrite. Stable isotope data are presented as follows:δ^(34)S = -0.3-+4.1‰, δ^(18)O = +0.6-6.8‰, and D = -6.8- -46.8‰. Evidence developed from fluid inclusions indicates that the temperature of altera-tion-mineralization ranges from 650°to 150℃. Ore fluids are high in salinity and richin Cl. The geological-geochemical characteristics of the deposit permit a conclusion that thestudied deposit is a porphyry-tungsten deposit.
出处
《地球化学》
CAS
1983年第2期121-132,共12页
Geochimica
