| 运用显微构造分析方法讨论西秦岭某铀矿床矿化活动的构造环境 |
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| 引用本文：王化锐.1991.运用显微构造分析方法讨论西秦岭某铀矿床矿化活动的构造环境[J].地球学报,12(1):35-50. |
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| 中文摘要:本文运用显微构造分析方法,讨论成岩期后铀矿化活动的构造环境。文中指出:矿化活动的首要条件是构造扰动;铀源质量改善和其后的叠加富集是矿化过程中的两次重要事件;吸附着铀的炭经构造重结晶作用从晶体中排出,从而改善了铀源质量;获释的炭和铀沿张性、张扭性裂隙聚集形成矿体;构造的作用在于提供了改变铀源的动力条件和矿化富集的空间场所。 方解石变形双晶、压溶缝合线等显微构造分析结果,一致表明区内引起变形的主应力近于水平。由压溶和重结晶前后矿物总表面积的变化推算的矿物表面能的变化为0.133J/cm3,以衡量应力强度。由动态重结晶颗粒粒度法估算的贮存着矿体的断裂的差异应力(σ_1-σ_3)为24—51MPa,且铀量随差异应力的增大而增加。 |
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| DISCUSSION ON STRUCTURAL ENVIRONMENTS OF URANIUM MINERALIZATION IN WESTERN QINLING MOUNTAIN BY ANALYSIS OF MICRO-STRUCTURES |
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| Abstract:This paper discusses the structural environments of post-diagenetic uranium-mineralization by analysis of micro-structures. It is pointed out that the first and foremost condition of mineralization is structural disturbance; the bettering of source uranium and their subsequent enrichment are the two important events in the mineralization; the uranium-adsorbing carbon is released from the crystal by structure-induced recrystallization, leading to refinement of sources uranium; the released uranium is concerntated into ores along the tensile and tenso-shear fractures. It is the tectonic activity that provides conditions favourable for the change of uranium, sources and creates the spaces for uranium enrichments.Analysis of the twinning of calcite, and the stylolites shows that the principal stresses are nearly horizontal. The change of surface energy calculated from the change of the total surface area before and after pressure solution and recrystallization, is 0.133J/cm3, which can serve as a measure of the magnitude of stress. The differential stress (σ1 -σ3) for ore-bearing fault estimated from the sizes of dyamic recrystallized grains, is 24-51 MPa. The uranium contents are found to increace with the increase of differential stress. |
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