| 安徽向山南硫铁矿的沉积一喷气沉积与热液叠加改造特征。 |
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| 引用本文：.1990.Exhalative sedimentation and hydrothermal superimposition-transformation characteristics of the Xiangshannan pyrite deposit, Anhui province[J].Mineral Deposits,9(4):375~384 |
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| 基金项目:博士后基金资助 |
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| 中文摘要:宁芜中段“向山式”硫铁矿，一直被认为是与玢岩铁矿成因相关及空间配套的中低温热液矿床。本文从矿化与地层和岩性的关系、矿体形态产状、含矿段沉积组合、矿石结构构造、矿物生成顺序、硫同位素组成及包裹体特征等诸方面，对向山南硫铁矿作了深入研究，认为该矿属沉积一喷气沉积成因，并受后期热液叠加改造。 |
| 中文关键词:沉积一火山喷气沉积 热液叠加改造 向山南硫铁矿 宁芜盆地 |
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| Exhalative sedimentation and hydrothermal superimposition-transformation characteristics of the Xiangshannan pyrite deposit, Anhui province |
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| Abstract:The Xiangshannan pyrite deposit located in the middle part of the Nanjing-Wuhu volcanic basin is one of the Xianghan-type pyrite deposits which used to be considered as hydrothermal deposits connected with subvolcanic rocks and associated genetically and spatially with porphyrite iron deposits. Nevertheless, our recent study shows that the Xiangshannan pyrite deposit is substantially of exhalative sedimentation and hydrothermal superimposition-transformation origin. The main evidence is as follows: ① mineralization is largely confined in a certain horizon; ② orebodies are stratiform, gtratoid and lenticuIar in form, being consistent with wall rocks in attitude; ③ sedimentary structures such as beddings, laminations and rhythmic units are commonly seen; ④ ore beds are interbedded or associated with siliceous formations, sedimentary tuff beds and gypsiferous layers making up a sedimentary volcanic sedimentary association; ⑤ paragenetic sequence of the main minerals is hydrite-pyrite-magnetite, contrary to the hydrothermal]sequence; ⑥ Sulfur isotope composition suggests that abundant sedimentary sulfur has been added to the deposit; ⑦ inclusions in minerals are very small(<5μm)with vapor/liquid ratio less than 10％, and their homogenization and decrepitation temperatures are about 85℃ and 100-140℃ respectively. In addition, manifestations of hydrothermal superimposition and transformation are very obvious, such as recrystallization, secondary enlargement and transformation of mineral facies. Pyrite deposits of this type are also distributed in the neighboring Lujiang-Zuyang volcanic basin. They are therefore of some regional significance. |
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