湖北慈口—富水地区地质构造特征及金构造地球化学

GEOLOGICAL STRUCTURE CHARACTERISTICS AND GOLD STRUCTURAL GEOCHEMISTRY OF CIKOU—FUSHUI AREA,HUBEI

慈口—富水一带的金异常和金矿化是受慈口—富水双冲式逆掩断裂带控制的;运用极射赤平投影法,恢复本区曾经历了五期构造运动及其构造应力场;运用构造地球化学的理论和研究方法,探讨了逆掩断裂带的功热转换、元素迁移富集及金富集的最佳构造部位;探讨了热液通道及迁移方向;提出了构造控矿模式。

The gold anomalies and mineralization along Cikou-Fushui are controlled by the Cikou-Fushui dual-thrusting fault zone. In this paper, the authors discuss in detail the geologi-cal characteristics of this fault zone; return the stress field of 5-stage structural movements in this area by using the stereographic projection; research into the thermal equivalent of work transferring of the thrusting fault zone by using the theory and study method for struc-tural geochemistry and preliminarily estimate the temperature increase from 98.2°to 141.5° K in the crushed zone within 100m above and below the thrust fault plane during the thrust-ing; research into the dynamic metamorphism and dynamo-thermal-metamorphic differen-tiation and come to a conclusion that the gold would concentrate on the margin of the com-pressive belt(or shear zone); research into the gold concentration controlled by different stage structures; early and late(from earliness to lateness) the gold concentration is: 3.4→20.9→229.1→254.2(×10^-9), and there are main metallogenic stages after the 3rd stage; the root of the thrusting fault zone and the upper thrusting plane might be the most abundant in gold which could be enriched into ore shoots when the both sites mentioned above are su-perposed by the strike normal fault. It is preliminarily assured that there are two central pas-sages for hydrothermal solution, around which the mineralization and alteration distribute; and the hydrothermal solution might be traced its migration direction. Finally, the metallo-genic model is put forward.