| 大厂锡矿床成因综合分析及成矿模式 |
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| 引用本文：韩发,R·W·哈钦森.1991.大厂锡矿床成因综合分析及成矿模式[J].地球学报,12(1):61-80. |
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| 中文摘要:本文通过对大厂锡多金属矿床区域成矿地质环境、矿体形态特征、原生金属-矿物分带、矿床地球化学的综合分析与研究,论述了该矿床在许多方面具有喷气沉积成因的特点。为此,我们把大厂锡多金属矿床与块状硫化物矿床、绿岩带金矿床及某些层控锡矿床进行了对比,从而明确了大厂锡矿属于含锡块状硫化物型层控锡矿床。本文还从发展、演化的角度,对大厂层控锡矿形成后的变形-变质作用进行了系统研究,阐明了同生与后生地质现象同时存在的原因,解决了对该矿床所提出彼此矛盾成因假说的难题。最后,建立了大厂锡矿的成因模式,并探讨了该超大型锡矿形成的特殊地质环境。 |
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| SYNTHETIC STUDIES ON THE ORIGIN OF THE DACHANG TIN-POLYMETALLIC DEPOSITS AND THEIR METALLOGENETIC MODEL |
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| Abstract:Broad and multi-faceted studies during the past 20 years have shown that all sedimentary exhalative deposits are formed on the seafloor by chemical precipitation from discharged metal-bearing hydrothermal fluids. The fluids are generated within the sub-area floor rock column by reaction between convectively circulated sea water and the rocks themselves. Differing rock columns in various tectonostratigraphic environments give rise to differing fluids and varieties of deposits. However, because of their common genetic process, all sedimentary exhalative deposits share a set of common identifying primary geologic characteristics, and it is of great significance for comparative investigating the origin of certain other deposits.The purpose of this paper is to briefly review the main geological and geochemical characteristics of the Dachang tin-polymetallic deposits, the genetic processes how they are formed, the deformation-metamorphism after ore-formation and its resulting geological characteristics. And then, it is to consider the relationship between the Dachang tin-polymetallic deposits and some strata-bound deposits including massive base metal sulfide deposits, greenstone belt gold lodes and stratiform tin deposits. The facts indicate that many of the geological and geochemical characteristics of the Dachang tin-polymetallic deposits are similar to those of the massive base metal sulfide deposits. These similarities suggest that many of the genetic and me-tamorphic processes involved in massive sulfide formation may have also contributed to formation of the Dachang deposits. So, Dachang deposits belong to the stratabound and stratiform tin deposits of tin-rich type of massive sulfide deposits.The specific tectono-stratigraphic environment formed Dachang tin-rich exhalative deposits is also discussed. The preliminary studies indicate that the following three conditions are necessary for the formation of these deposits (1) A convectively circulated hot brine system has been initiated by rifting; (2) Some involvement of older continental crust pre-enriched in tin in submarine exhalative system is obviously happened 5 (3) At least two or three successive tectono-magmatic stages are involved in the evolutionary metal-logenesis of the Dachang tin deposits. |
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