福建上杭紫金山铜金矿床中黄铁矿的矿物学特征研究

Study on Mineralogicul Characteristics of Pyrite in copper gold mine from Zijin Mountion Shang hang county Fujian Province

紫金山铜金矿床中黄铁矿质量分数达（5．3～7．0）W（B）／10^-2，主要有2种晶体形态即结晶完好与致密块状。二者含量比例为37：63；其形成世代，结晶形态、所含其他元素的种类、含量及与其他矿物的共生关系差异显著。采用矿物鉴定仪器，化学分析、电子探针、光栅光谱、红外光谱等分析，对该黄铁矿进行矿物学方面研究，结晶完好黄铁矿的化学成分、电子探针面线扫描分析，表明其属于硫化矿床中常见黄铁矿类型；致密块状黄铁矿属于较特殊类型．其化学成分中Cu、As含量是结晶完好者的15倍～18倍，W、Zn、Ni等含量变化大。通过光片、砂光片、红外光谱分析、化学式计算、电子探针等系统分析，说明这些元素与主元素Fe、S不呈类质同象替代关系，并证实其中包裹有微细的蓝辉铜矿、硫砷铜矿或似黄锡矿等矿物，导致成分中Cu、As、W、Zn等元素偏高和波动。实测显微密度（5．031～4．987）g／cm^3，显微硬度Hv10=（90．02～94．1）Mpa，（Hm=6．55～6．35），测得反射率（R）54．10～53．50（白）。

The pyrite quality score reaches to a 5.3-7.0 W （B） /10^-2 in Zijin Mountain copper gold mine bed, mainly have two kinds of crystal appearances-the crystallization intact and massive dense granular. Two content＇s comparison is. 37：63; Its formulating generation,crystallization appearance, category with other elements, content and show zhao with the symbiosis difference of other minerals. Adopt mineral identification apparatus, chemical analysis, electron microprobe, grating spectral, infrared spectroscopy analysisetc, carry on a mineralogy research to that pyrite, result enunciation： The chemistry component, electron probe, electron microscopy noodles, line which crystallizes an intact pyrite scans analyse and express that it belongs to the familiar pyrite type in the vulcanized mineral deposit; The Cu, As content is to crystallize an intact pyrite of 1500-1800%, the W, Zn, Ni etc content variety are big. Pass systematic analysises, such as the analyse, chemical formula calculation of the polished section, sand polished section, infrared spectrum, electron probe analysis ets, explain these elements and it the major element Fe, S don＇t present an isomorphism,allomerism to act for a relation, and confirm to wrap up to have a very small blue chalcocite, the Digenite, the Enargite or the stannoidite tin mine etc. cause the Cu, As, W, Zn etc. element in the component higher with motion. Actually measure to show minute details the density 5. 031-4. 987g/cm3, the Hv HV10=90.02-94.1Mpa of the micro hardness （about Hm6.55-6.35）, measure the reflectivity R. 54.10-53.50 （leuco）.