中文摘要:城隍山地区铅锌(银)矿床分布于石英斑岩接触带，矿体以矽卡岩型为主，伴有石英脉型和细脉浸染型。矿石中Cd、Bi、Se和Te等微量元素的含量较高。主要矿化阶段的均一温度为220～330℃，盐度多数在4.4 wt％～24 wt％NaCl范围内。同位素研究表明：石英斑岩中锆石年龄(243×106a)与矿石年龄(232.6×106a和201×106 a)接近，矿石铅为幔壳混合铅，δ14S在-4.6‰～+3.57‰，δ18OH2O在-7.63‰～+5.03‰范围内变化。初步认为该矿床的成因在很大程度上与石英斑岩有关，岩浆期后热流体中有部分大气水和地层(包括围岩)物质的加入。
Abstract:In Chenghuangshan area of west Suzhou, lead-zinc(silver)deposits occurring along or near the contact zone of quartz porphyry are dominated by skarn type ore bodies associated with quartz vein type and veinlet disseminated ore bodies. The relationship between skarn type mineralization and skarn shows synchronicity and superimposition. There exists a distinct boundary between skarn and limes gone which on!y experienced slight thermo metamorphism, showing characteristics of infiltration metasomatism. The veinlet disseminated ore body might sometimes grade into the skarn type or quartz vein type ore body. Ores contain fairly high trace elements such as Cd, Bi, Se and Te. The age of zircon from quartz porphyry (243×106 a)is close to that of skarn ore(232.6×106a and 201×106a). Rb-Sr and Sm-Nd isotopic calculation reveals that skarn ore contains more upper crust component (49. 5％) than qurtz porphyry(20％). The projection of lead isotope data of ore crosses the increment line at a relatively large slope(m = 0.3798), suggesting the character of mantle-crust mixed lead. 34S values are in the range of -4.6‰～+6.54‰. In skarn mineralization type, δ18OH2O values are -7.41‰～-7.63‰ for quartz. Salinity varies discontinuously in a wide range, i.e. generally from 7.8 to 24 wt％NaCl. Homogenization temperatures are concentrated in the range of 220-330℃. These data, combined with geological facts, indicate that the deposits are genetically related to quartz porphyry, with some underground water and stratigraphic substances (including ore materials) added to magmatic fluids.
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宁仁祖，强小虎.1992.城隍山地区铅锌(银)矿床的地质特征及其成因探讨[J].矿床地质,11(2):125~133.1992.Geological Characteristics And Genesis Of Lead-Zinc(Silver)Deposits In Chenghuangshan Area[J].Mineral Deposits11(2):125~133
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