摘要
脉状热液金矿成矿元素析出沉淀遵循一定的顺序 ,并与相应的成矿阶段相一致。是由成矿元素的原子结构、晶体化学、电化学及其结合规律、成矿元素在热液中的活动性和晶体场稳定能决定 ;控制脉状热液金矿的断裂构造带上部张性裂隙群相对发育 ,氧逸度相对高 ,地下水较其深部丰富以及相应的外压力突降、挥发性物质逸散、氧化、地下水稀释作用和成矿元素本身亲氧性与亲硫性的差异等因素 ,导致进入断裂带中的金属硫配合物在上部首先分解沉淀 ,而后依次是中、下部。上部断裂构造的张开、充填、凝固对断裂构造起“焊接作用”,阻挡屏蔽了下一期次矿液的上升 ,后来的矿液只能屈居前次成矿体之下依次充填、凝固 ,由此最终导致了脉状热液金矿的垂向分带。
It follows a certain sequence and is consistent with the corresponding metallogenic stage that the metallogenic elements of the vein hydrothermal gold deposits separate out the precipitation. It is determined by the atomic structure, crystal chemistry, electrochemistry and their combination of the metallogenic elements, the activity of the metallogenic elements in the hydrothermal and the stable energy of crystal field. In the faulted structure belt controlling the vein hydrothermal gold deposits, the relatively developed upper extension fissure group, with the factors of high oxygen fugacity, more abundant groundwater than the deep and the corresponding sudden relief of outer pressure, bleeding and oxidation of the volatile matter, dilution of the groundwater, and differences between sulphophile and oxyphile elements of the metallogenic elements, cause the metallic sulphide complex entered the faulted belt first decomposition and precipitation in the upper of the belt, then in the middle and lower of it. The opening,filling and solidification of the upper faulted structure play the role of 'welding' to the faulted structure, shield the elevation of the next ore solution. So the later ore fluid successively fills and solidifies under the former metallogenic orebody. It finally results in the vertical zoning of the vein hydrothermal gold deposits.
出处
《黄金地质》
2000年第4期46-52,共7页
Gold Geology
