| 夏塞银多金属矿床中硫化物和硫盐系列矿物特征及其意义 |
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| 引用本文：.2000.Characteristics of sulfide and sulfosalt minerals from the Xiasaisilver-polymetallic deposit and their significance[J].Mineral Deposits,19(4):363~375 |
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| 基金项目:“九五”国家重点项目 |
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| 中文摘要:夏塞矿床是大型的热液脉型银多金属矿床。通过对大量矿石光（薄）片观察和电子探针分析表明，除主要（方铅矿、富铁闪锌矿）和次要（黄铁矿、毒砂、磁黄铁矿、黄铜矿等）硫化物外，硫盐系列矿物十分发育，主要有Cu-Sb-Ag硫盐（黝铜矿、含银黝铜矿和银黝铜矿）、Sb-Ag硫盐（深红银矿、辉锑银矿）、Pb-Sb硫盐（脆硫锑铅矿、硫锑铅矿）和BrPb硫盐（斜方辉铋铅矿）。此外，尚有少（微）量黄锡矿、锡石、自然铋和银金矿等。银的硫盐矿物和硫化物（辉银矿）乃是获得银的主要工业矿物。这些硫盐系列矿物常与硫化物伴生，多沿方铅矿、富铁闪锌矿、黄铁矿等的解理、裂隙或粒间产出。这些研究结果不仅有助于了解矿化作用过程，而且为矿床评价、组分综合利用和选冶提供重要依据。 |
| 中文关键词:夏塞银多金属矿床 硫化物 硫盐矿物 川西 |
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| Characteristics of sulfide and sulfosalt minerals from the Xiasaisilver-polymetallic deposit and their significance |
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| Abstract:The Xiasai ore deposit is a large hydrothermal vein type silver-polymetallic deposit genetically related to the late Yanshanian porphyritoid monzonitic granite emplaced in Upper Triassic Tumugou Formation. The orebodies veinlike, lenticular and chamber in form are mainly controlled by NWW -and nearly SN-striking faults and their intersections within sedrmentary- (volcanic) fragmental rocks of Tumugou Formation. Based on the investigation of a considerable number of polished ore sections and electron microprobe analyses, the authors determined the compositions of ore minerals, which consist mainly of galena, iron-rich sphalerite and sub ordinately pyrite, a rsenopyrite, pyrrhotite, chalcopyrite as well as m any kinds of sulfosalt minerals. The Cu-Sb-Sb sulfosalts ( tetrahedrite,Ag-bearing tetrahedrite and freibergite) and Sb-Ag sulfosalts (pyrargyrite, miargyrite) and sulfide (a rgentite) are the most important silver minerals. The Pb-Sb sulfosalts a re jamesonite and boulangerite. The observed Br-Pb sulfosalt is only cosalite. Moreover, the ores contain small amounts of native bismuth and electrum. The investigations under microscope show that the sequence of sulfide formation is essentially arsenopyrite pyrite pyrrhotite, iron-rich sphalerite galena chalopyrite, stannite argentite. The formation of the sulfosalts is commonly later than common sulfides in the deposit. The sequence of the sulfosalts formation is commonly Cu-Sb-Ag sulfosalts Sb-Ag sulfosalts Pb-Sb sulfosalts Bi-Pb sulfosalt. Most argentite and silver sulfosalts are characterized by their occurrence in cleavages, fissures or intergranular space of galena. As for the chemical composition of tetrahedrite, Ag-bearing tetrahedrite and freibergite, there exists negative correlation between silver and copper and silver content bears no relationship with atomic proportion and Sb/ (Sb+As) ratio of ( Fe+ Zn). These results are of significance in understanding mineralization process, dividing mineralization stages and determining sequence of ore mineral formation, and also provide an important information for integrated evaluation of the deposit as well as ore dressing and smelting. |
| keywords:Xiasaisilverpolymetallic deposit, sulfides, sulfosalts, west Sichuan |
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