Minor Elementa in Sphalerites and Galena from Fankou Pb-Zn Deposit and Their Ratios-A Comparative Study
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    Abstract:

    The representative sphalerite separates, galena separates and zinc concen- trates from Fankou Pb-Zn deposit have been analysed. The analyses show that the Fankou sphalerites is rich in Ga, Ge and Ag, but poor in Se and Te; the Fankou galena are rich in Ag, Hg, Sb and As, but poor in Se, Te and Tl. The average of Zn/Cd ratios for sphalerites from Fankou is 311. This ave- rage is similar to those . from Gaobanhe deposit and Heqing deposit, which may be classified as the Mississippi Valley type (i. e. MV type) deposits, Accesa deposit(Alpine type) and Broken Hill deposit(sedimentary-metamorphic type), and is lower than those from Bleikvassil deposit (volcano-sedimentary type), Gorno deposit (Alpine type with some volcano-sedimentary features) and Pine Point deposit, (MV type),but higher than those from all of the discussed skarn- hydrothermal and hydrothermal deposits. The Ga-Ge-Ag atomic ratios for sphalerites (especially light sphalerites) from Fankou are similar to those for the syngenetic sphalerites from the British Isles and ror sphalerites from Gorno deposit. The average of Sb/Ag ratios. (0 .74)in galena from Fankou is closed to that (0.8) in the syngenetic galena from the British Isles, but much lower than those from other deposits. The Sb-Bi-Ag atomic ratios in F ankou galena are closed to that in the syngenetic galena of the British Isles and not very diffe- rent from that in Broken Hill galena. On the basis of the comparison of the minor elements and their ratios in Fankou and other deposits, the following conclutions can be reached:(1 ) Fan- kou deposit possesses some syngenetic features;(2)It is similar to MV type deposits, Alpine type deposits and sedimentary-metamorphic deposits, as well as different from them in minor element aspect;(3)It evidently differs from skarn type, and volcano-hydrothermal type deposits in the characteristics of minor elements.

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宋学信,1982,凡口矿床闪锌矿和方铅矿的微量元素及其比值——一个对比性研究[J].岩石矿物学杂志,1(3):37~44.,1982,Minor Elementa in Sphalerites and Galena from Fankou Pb-Zn Deposit and Their Ratios-A Comparative Study[J]. Acta Petrologica et Mineralogica,1(3):37~44.

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