| 粤东锡多金属矿床稳定同位素地球化学研究 |
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| 引用本文：.1994.Stable isotope geochemical studies of tin-polymetalltc deposits in eastern Guangdong[J].Mineral Deposits,13(4):322~330 |
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| 中文摘要:粤东锡多金属矿床硫同位素具有两个显著特征，即共生硫化间硫同位素的不平衡性和东西矿带硫同位素的差异性。前者是由不同来源的硫的混合引起的，后者则可归因于主要硫源的差异。成矿流体氢、氧同位素复杂多变，既不同于该区初始花岗岩浆水的同位素组成，也不完全同干区内中生代大气降水的氢、氧同位素组成，显示其是混合成因的。混合的端员流体是再平衡的岩浆水和再平衡的大气降水。 |
| 中文关键词:粤东 锡多金属矿床 硫氢氧同位素 |
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| Stable isotope geochemical studies of tin-polymetalltc deposits in eastern Guangdong |
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| Abstract:The tin-polymetallic deposits in eastern Guangdong occur along two NNE-stretching fault bells, forming two metallogenic belts，namely the eastern and the western belt. Sulfur isotopic composition of the deposits in the eastern belt is higher than zero, suggesting the derivation of sulfur mainly from the granitoids. On the contrary, sulfur isotopic composition of the deposits in the western belt is lower than zero, indicating that sulfur was mainly derived from sedimentary rocks. Sulfur isotopes of coexisting sulfide minerals in most of these deposits are not in equilibrium. Hydrogen and oxygen isotol6ic composition of ore-forming fluids varies greatly and is different both from the composition of the local initial magmatic water and from that of the local Mesozic meteoric water. It has been inferred from these facts that the fluids are mixed ones, with the end-member fluids including the reequilibrium magmatic water which interacted and exchanged hydrogen and oxygen isotopes with local granitoids and the reequilibrium Mesozoic meteoric water which interacted and exchanged hydrogen and oxygen isotopes with local granitoids or sedimentary rocks. The mixing of the two types of reequilibrium fluids accounts for the nonequilibrium of sulfur isotopes between coexisting minerals in the deposits. |
| keywords:eastern Guangdong, tin-polymetallic deposit, sulfur, hydrogen and oxygen isotopes |
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