| 浙东南陆相火山岩型铅锌（银）矿床的成矿作用研究 |
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| 引用本文：.1990.Minergenesis of continental volcanic type lead-zinc (silver) deposits in southeastern Zhejiang[J].Mineral Deposits,9(3):208~222 |
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| 中文摘要:浙东南地区火山岩型铅锌（银）矿床可进一步分为两个亚类：火山一次火山热液型和火山喷发沉积一热液叠加（改造）型，其中以前一类型较重要。硫，铅同位素组成及微量元素等研究表明：成矿主要与中生代火山作用有关，成矿物质主要来自与上地幔和下地壳有关的火山岩和次火山岩，火山机构控制着矿床类型及规模。火山一次火山热液型矿床主要受火山穹隆控制，而火山喷发沉积一热液叠加（改造）型矿床主要产于火山洼地中。 |
| 中文关键词:陆相火山岩型铅锌矿床 成矿作用 浙东南 |
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| Minergenesis of continental volcanic type lead-zinc (silver) deposits in southeastern Zhejiang |
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| Abstract:Mesozoic volcanic activity was extremely intense in areas east of the Jiangshan-Shangyu deep fault; the area east of the Lishui-Yuyao deep fault, in particular, is almost wholly covered with volcanic rocks. Volcanic activity mainly includes two cycles Late Jurassic and Cretaceous. The Late Jurassic volcanic activity characterized mainly by central type explosion or intermediate-acid to acid magma, was extensive and strong and controlled by NE- and NW-trending basement faults, forming a series of NE-distributed nearly round volcanic domes and calderas; volcanic rocks are predominantly intermediate-acid to acid tuff and welded tuff interbedded with lava, some 3000 m in thickness. Cretaceous volcanic activity was relatively weak, noted mainly for intermittent volcanic eruption and sedimentation volcanic rocks are chiefly tuffaceous sandy conglomerate and siltstone intercalated with intermediate basic to intermediate-acid lava, intermediate-acid volcaniclastic rocks and tuffite. Over 60％1ead-zinc deposits in Zhejiang province are related to volcanic rocks, and the volcanic type lead-zinc deposits can be further divided into volcanic-subvolcanic hydrothermal type and volcanic eruptive sedimentary hydrothermal superposition type. The former deposits, exemplified by Wubu deposit of Huangyan county and Dalingkou deposit of Tiantai county, are mainly controlled by volcanic dome and belong to mesothermal-epithermal deposits related to volcanic-subvolcaic activity, being the major type of lead-zinc deposits in this province; the latter deposits occur mainly in volcanic depression or sedimentary lacustrine basin, and are related to volcanic eruptive sedimentation with late hydrothermal superposition．The volcanic hydrothermal mineralization can be divided into three stages. The early sulfide stage mainly formed pyrite and arsenopyrite, accompanied by extensive wall rock altterations such as sericitization and solicification; the middle sulfide stage was the principal metallogenic stage and formed large quantities of sphalerite and galena accompanied by other metallic sulrides(copper, silver etc.); the late carbonate stage formed manganiferous carbonate and quartz as well as small amounts of disseminated galena and sphalerite. Data on ore-forming temperatures(200-300℃)suggest that these deposits are of mesothermal-epithermal type. |
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