【摘要】 <正> 世界各国历来对金矿的开发和研究十分重视,特别是近年来在金矿地质工作和成矿理论研究方面都有明显的进展,但对金矿床的成因分类尚有不同认识。 近几年来,笔者在研究下扬子区金属矿床的同时,注意到一种在区域内较稳定产出、受海底热事件控制的金矿床新类型——“沉积—海底喷出沉积—热液变质改造”成因(Cu、S)金矿床(以下简称“海底喷出沉积”金矿床)。本文特对这种类型的金矿床作些扼要的阐述。更多还原

【Abstract】 In recent years, during the study of Cu and polymetal ore deposits in the Lower Yangtze area, the authors have observed a new type of Au ore deposits of ’’sedimentary-submarine effusive-hydrothermal" origin that occurred stably in a given region and in a consistent horizon. Mashan Au ore deposit is an instance. Such type of Au deposit is essentially consistent with pyrite beds, occuring in Huanglong formation of Middle-Carboniferous.Geological and geochemical data, mineral components of Au (Ag) and the mode of occurrence of such type of AU ore deposits reyeals that there existed certain trends of Au concentration. For example, Au appears comparatively richer in the upper and lateral part of the pyrite beds. Au content often show higher in pyrrhotite and pyrite than in chalcopyrite. There also existed a tendency that Au concentrated in the zone of fractures contemperaneously to diagenetic stage rather than unfractured zone. Au seems to be comparatively more concentrated in gossan than in primary zore. This will be surely benefit to further prospecting and exploration. In the present paper the arthors also brie-fly discuss the mechanism of formation of such type of Au deposits.更多还原