黄铁矿晶体形态标型在金矿评价中的意义

黄铁矿晶体形态是金矿床矿物学填图的良好指示参数之一.黄铁矿的微形貌特征具有指示其形成环境的意义.在金矿床中,早期成矿阶段结晶的a{100}或e{hk0}形态黄铁矿含金性较差;主成矿阶段形成的ae、aeo、ao、oa、oe等聚形晶,以及{310}、{320}等e黄铁矿含金性较好.黄铁矿形态沿矿体空间可以表现出分带性.其垂向分带趋势为:矿体上部以o{111}晶形为主,矿体中部以e{hk0}形为主,矿体下部主要以a{100}形占主导,或分别以其晶面发育的聚形为主.但不同矿床,甚至同一矿床的不同矿脉,这种分带的表现也不完全一致.因此,应用此分带模式进行深部矿体预测时,应具体情况具体分析.

The significance of crystal form typomorphism of pyrite in assessment of gold deposit

The crystal form typomorphism of pyrite is one of instructing coefficient of mineralogcial mapping in the gold deposits. The features of micro-crystal morphology of pyrite have an important significance of instructing their form conditions. In gold deposit, the crystal form of the early barren pyrite shows nearly the cube or pyritohedron, that of the major stage auriferous pyrite is of conbination crystal of ae, aeo,ao, oa, oe or of {310},{320} pyritohedron etc. The space distribution of the crystal form of pyrite is: in the upper part of orebody, pyrite is usually octahedron; in the middle, pyritohedron; in the lower, cube. The space distribution is not always the same in different gold deposits, even in different veins of one single gold deposit. Detailed research should be carried out when applying the model of the space distribution to predict the blind ore bodies at depth.