| 江西阳储岭钨钼矿床稳定同位素组成特征的研究 |
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| 引用本文：.1984.Stable Isotope Studies Of The Yanchuling Tungsten-Molybdenum Ore Deposit,Jiangxi Province[J].Mineral Deposits,3(2):49~58 |
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| Stable Isotope Studies Of The Yanchuling Tungsten-Molybdenum Ore Deposit,Jiangxi Province |
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| Abstract:The Yangchuling complex is composed of four stage intrusives, i.e., quartz diorite, granodiorite, granodiorite porphyry-l and granodiorite porphyry-ll; the W-Mo ore body is hosted by the fourth intrusive body. In order of intrusion, the δ18O values increase gradually by l.3‰, indicating a magmatic differentiation character. Theδ18O values of the main part of the complex are estimated to be 9.9-10.5‰, suggesting possible derivation of the magma from the upper crust. The isotope temperatures of granodiorite porphyry and granodiorite, believed to be the tower limits of their formation temperatures, are about 545 ~ 550℃ respectively. Isotope studies show that no fluids were involved in thermometamorphic process. The hornfelsization, therefore, supposedly took place in a rather "dry" environment. The ore-forming temperatures measured by such methods as homogenization temperature, decrepitation and quartz-scheelite isotopic geothermometer are approximately in the range of 300-400℃； the isotopic compositions determined with inclusion water and calculated byδ18O values of quartz areδ18O ： 5.1—-6.9‰, δD: -54—-69‰ for ore-bearing fluids, andδ18O : 9.0—10.1‰, δD: -69—79‰ for magmatic water. The ore-bearing fluids are considered to be mainly made up of the magmatic water. From the isotopic compositions of calcite and sulfides, theδ13 C andδ3S values of total carbon and total sulfur in hydrothermal fluids are determined to be -5—8‰ and -3—+3‰ respectively. The hydrothermal carbon and sulfur were also predominantly derived from the magma. |
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