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个旧某硼氟交代型矽卡岩锡矿的成矿作用 被引量:1

METALLOGENESIS OF A CERTAIN B-F-METASOMATIC SKARN Sn ORE DEPOSIT AT GEJIU
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摘要 Recently, a, new type of skarn Sn ore formed bY B-F-metasomatism has been found in the central part of the Malage ore field at Gejiu, Yunnan Province, which contains 1--7% Sn. The principal Sn minerals are nordenkioeldine hydromagno-cassitcrite, hydro eassiterite, etc., accounting for about 4%. Cassiterite is rarely seen (less than 0.2%).Outward from the interior of skarns are distinguished four alteration zones. Ore solutions were rich in AL and Si in the early stage of skarnization, and became enriched in Fe, Mg, Sn, B, F, H2O, etc. in the late stage. Two episodes of hydrothermal metasomatism of B and F took place during post-skarnization, and the different alteration zones may be due to reaction between B-and F-bearing hydrothermal solutions and country reeks (calcareous carbonates). The stability of the metasomatic minerals in controlled by the volatile components μB2O3, μCO2, μF2O-1 and μF(OH)-1. It has been concluded from the discussion in terms of the system CaO-SnO2-SiO2-H2O-B2O3-CO2 Fo-1 F2 o-1 proposed by Burr (1978) and the topological diagrams on chemical composition constructed by the author that nordeuskioeldine was formed in the exhaustion of Si at about 400℃ in the skarn environment, where metallogenetic conditions are characterized by rich oxygen but poor sulfur, and high boron hut low fluorine, while hydromagno-cassiterite and hydro-cassiterite were formed at the lower temperature (about 150℃) by hydrothermal metasomatism of fluorine. In comparison with the metallogenetic conditions for adjacont inner-skarn Sn ores and other Sn ore deposits at Gejiu, the role of the characteristic elemental association Sn-B-F is emphasized in this paper. Recently, a new type of skarn Sn ore formed by B-F-metasomatism has been found in the central part of the Malage ore field at Gejiu, Yunnan Province, which contains 1-7% Sn. The principal Sn minerals are nordenski(?)ldine hydromagno-cassiterite, hydro cassiterite, etc., accounting for about 4%. Cassiterite is rarely seen (less than 0.2%). Outward from the interior of skarns are, distinguished four alteration zones. Ore solu-tions were rich in Al and Si in the early stage of skarnization, and became enriched in Fe, Mg, Sn, B, F, H20, etc. in the late stage. Two episodes of hydrothermal meta-somatism of B and F took place during post-skarnization, and the different alteration zones may be due to reaction between B-and F-bearing hydrothermal solutions and coun-try rocks (calcareous carbonates). The stability of the metasomatic minerals in controlled by the volatile components μ,B203, μC02, μF20-1 and μF(OH)-1. It has been concluded from the discussion in terms of the system CaO-Sn02-Si02-H20-B203-C02 F0-1 F2 0-1 proposed by Burt (1978) and the topological diagrams on chemical composition cons-tructed by the author that nordenski(?)ldine was formed in the exhaustion of Si at about 400℃ in the skarn environment, where metallogenetic conditions are characterized by rich oxygen but poor sulfur, and high boron but low fluorine, while hydromagno-cassiterite and hydro-cassiterite were formed at the lower temperature (about 150℃) by hydro-thermal metasomatism of fluorine. In comparison with the metallogenetic conditions for adjacent inner-skarn Su ores and other Sn ore deposits at Gejiu, the role of the chara-cteristic elemental association Sn-B-F is emphasized in this paper.
作者 魏明秀
出处 《地球化学》 CAS 1985年第1期37-44,共8页 Geochimica
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  • 4Peng Chengdian. Recent New Discoveries in Geological Prospecting for Tin and the Techniques and Methods Employed at the Gejiu Tin Fields. China[R]. ICCP project No.282 First Meeting,1989.
  • 5Wang Zhifen.The mineralization stages and paragenetic association of minerals of Gejiu tin deposit, Yunnan[A]. Wu Liren,Yang Taiming,Yuan Kuirong, et al. The crust: the Significance of Granite-Gneisses in the lithosphere[C]. Athens, Greece:Theophrastus Pu
  • 6云南省地质矿产局.云南省区域地质志[M].北京:地质出版社,1990.415-427.
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