| 右江盆地流体运移过程中成矿与成藏作用 |
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| 引用本文：向才富,胡建武.2003.右江盆地流体运移过程中成矿与成藏作用[J].地球学报,24(5):423-428. |
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| 基金项目:国家攀登计划预选项目(95预39)，国土资源部重点科研项目(9501103) |
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| 中文摘要:右江盆地裂陷期和坳陷早期的沉积物提供研究区金矿与古油藏的物质与流体。成矿物质与烃类在盆地流体中沿以二叠纪生物礁为核心的断层、浊积岩及不整合面组成的三维输导体系向盆地边缘及二叠纪生物礁的核部运移。由于烃类物质与盐水体系密度的差异，使烃类物质与成矿物质差异聚集于不同的圈闭中形成流体藏。流体矿藏的破坏是导致成矿物质沉淀形成矿床的直接原因。构造活动、风化剥蚀及流体压裂均可导致流体矿藏破坏，其中燕山构造运动是该区流体藏破坏的主要原因，因而亦是该区金矿成矿作用的主要构造营力。本文从盆地流体运移、演化的角度证明，该区古油藏是盆地裂陷与坳陷阶段流体聚集的产物，而矿床则是盆地挤压抬升阶段流体藏破坏、流体散失的结果。研究成果表明，金矿与油气是同一盆地流体在其不同演化阶段的产物，这对在盆地中寻找相同类型的金属矿产意义重大。 |
| 中文关键词:盆地流体 流体藏 输导体系 差异聚集 右江盆地 |
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| Ore-forming Process and Petroleum Accumulation during Fluid Migration in the Youjiang Basin, South China |
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| Abstract:The sediments deposited in the rifting and the early depression stages provided materials and fluids for ancient oil reservoirs and ore deposits. The ore forming elements and the organic matter were transported to the basin margin or the core of the Permian reef by the same basin fluid along the conduit systems consisting of faults, turbidite sandstones and unconformities. Due to the density difference, the hydrocarbon and the ore bearing fluids were trapped in different reservoirs (hydrocarbon reservoirs or ore bearing solution reservoirs) along the conduit systems. The destruction of these reservoirs changed the characteristics of the fluids to an extreme extent and caused the precipitation of the ore forming elements. Tectonic movement, erosion and fluid hydrofracturing were three factors responsible for the destruction of the fluid reservoir, with the first factor being most important. Thus, the gold deposits in the Youjiang basin were formed mainly during the Yanshanian tectonic movement. Viewed from the fluid migration and evolution, the ancient oil reservoirs were formed during the rifting and depression stages of the basin, while ore deposits resulted from the destruction of the fluid reservoirs during the uplifting stage of the basin. This analysis verifies the conclusion that the ore deposits and ancient hydrocarbon reservoirs in this area are products of the same basin fluid in its different stages of evolution. The conclusion reached is of great significance in guiding the exploration of the same kind of ore deposits in the sedimentary basin. |
| keywords:basin fluid fluid reservoir conduit system differential concentration Youjiang basin |
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