锰的迁移形式成矿机理新探

通过对锰氢化物、锰羰基化合物、锰羰基氢化物的形成条件和理化性质,现代火山气体化学成分,现代海底喷口热液流体成分,有关矿床矿物流体包裹体气相成分,有代表性锰矿物化学成分及铁锰结核的物质组构,菱锰矿的碳同位素组成、锰矿物的共生、伴生矿物组合的探究,认为锰氢化物、锰羰基化合物、锰羰基氢化物是原生锰矿的主要迁移形式.它们从地球深部强还原富H2、富CO高压环境通过断裂、裂隙随岩浆、热液迁移至地壳浅部,由于压力、温度骤降,氧逸度大增,H2和CO逃逸、氧化,锰氢化物、锰羰基化合物、锰羰基氢化物分解、氧化、硫化成原生锰矿,经氧化淋(浸)滤,形成锰的高价氧化矿物.

A NEW APPROACH TO Mn MOBOLIZATION AND METALLOGENIC MECHANISM

Based on the study of physiochemical property and forming condition of Mn hydroxide,Mn carbonyl,hydroxide of Mn carbonyl,chemical composition of gas from modern volcano and fluid from modern submarine vent,chemical composition of gas of fluid inclusion of mineral from submarine ore deposit,chemical composition of the representative Mn mineral and fabrics of Fe-Mn concretion,the C-isotopic composition of rhodochrocite and paragenetic minerals of Mn mineral we consider that Mn hydroxide and Mn carbonyl are the two main forms for Mn mobilization of the primary Mn ore.They are moved up with magma and hydrothermal fluid from the CO-rich and strong reductive hydrogen environment through faults and cracks to the shallow crust.With abrupt reduction of pressure and temperature and abrupt rise of O-fugacity at the upper level hydrogen and carbon dioxide are released and oxidized and Mn hydroxide and carbonyl compound and Mn carbonyl hydroxide are broken,oxidized and sulfidized to form the primary Mn ore which in turn is oxidized and leached to form high valance Mn oxide.