| 红泉铀矿床含矿热液运移的数学模拟研究 |
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| 引用本文：.1988.A mathematic simulation study on the movement of ore-bearing hydrothermal fluids in the Hongquan uranium ore deposit[J].Mineral Deposits,7(4):83~89 |
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| 中文摘要:红泉铀矿床系吕梁期岩浆气成热液成矿作用和海西期含矿热液成矿作用复合叠加形成的矿床。本文运用有限单元法数学模拟海西期含矿热液运移方向和铀沉淀部位。结果表明，海西期含矿热液从伟晶状白岗岩汲取铀，在构造应力作用下，从高应力区向低应力区运移，并在断裂发育的低应力区富集成矿。 |
| 中文关键词:铀矿床 有限单元法 数学模拟 构造应力场 热液运移 |
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| A mathematic simulation study on the movement of ore-bearing hydrothermal fluids in the Hongquan uranium ore deposit |
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| Abstract:The metallization of Hercynian groundwater ore-bearing hydrothermal fluids played an important role in the further concentration of orebodies in the Hongquan uranium ore deposit. The investigation into the migration direction of Hercynian ore-bearing hydrothermal fluids and the favorable positions for uranium metaIlization is therefore of great significance in search for rich orebodies. Studies show that the groundwater was heated during its ascent as a result of the effect of geothermal gradient and expected uranium from the giant alaskite, forming ore-bearing hydrothermal fluids. From the relationship between internal pressure (p) of fluids in porous media and stress of the media(σ), i. e., p =Cσ, it is known that the movement of ore-bearing fluids are controlled by structural stress. The finite element method is hence adopted to determine the distribution pattern of structural stress field and, on such a basis, to investigate the migration direction of the ore-bearing hydrothermal fluids and the favorable positions for uranium precipitation. The azimuths of various stress axes(Fig.4) are obtained from the polar equidensity diagram (Fig.3). It is seen that the maximum principal stress is in approximately horizonal SN direction in this area．The contour map of maximum principtal stress (Fig. 6) calculated from network diagram of structure-finite elements (Fig.5) shows that the ore-bearing hydrothermal fluids moved from high stress area to low stress area under the action of structural stress, and were concentrated to form ore deposits in contact zones between giant alaskite and metamorphic schist which were geologically and physic-chemically favorable for ore deposition. It is therefore concluded that these contact zones axe promising places for ore-prospecting. |
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