镇旬矿田泥盆系和志留系铅锌矿的成矿地质条件分析
Metallogenic conditions of Devonian-Silurian lead-zinc deposits in the Zhenxun ore field
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摘要: 提要：对镇（安）旬（阳）矿田泥盆系、志留系铅锌矿的成矿地质条件分析表明，本区泥盆系、志留系铅锌矿总体属层控矿床类型。铅锌矿赋存于下志留统梅子垭组、中志留统双河镇组及中泥盆统大枫沟组、上泥盆统南羊山组；控矿构造为断裂、褶皱，容矿构造为顺层断裂带、剪切带，含矿岩石为含碳砂岩、千枚岩及灰岩、生物灰岩、白云岩；沉积环境为浅水陆棚相、台地边缘及泻湖、潮坪、台地浅海。以旬阳泗人沟为代表的志留系铅锌矿属细碎屑岩沉积强改造型铅锌矿床；以旬阳大岭、赵家庄为代表的泥盆系铅锌矿属碳酸盐岩沉积弱改造型铅锌矿床；以镇安锡铜沟、月西为代表的泥盆系铅锌矿属碳酸盐岩沉积强改造型铅锌矿床。Abstract: Abstract：Study of metallogenic conditions of Devonian-Silurian lead-zinc deposits in the Zhenxun (Zhen′an-Xunyang) ore filed shows that Devonian-Silurian lead-zinc deposits in the area generally belong to stratabound deposits. The lead-zinc deposits occur in the Lower Silurian Meiziya Formation, Middle Silurian Shuanghezhen Formation, Middle Devonian Dafenggou Formation and Upper Devonian Nanyangshan Formation. The ore-controlling structures are faults and folds and ore-hosting structures are bedding-parallel fault zones and shear zones; ore-bearing rocks are carbonaceous sandstone, phyllite, limestone, biogenic limestone and dolostone; the sedimentary environments are the shallow-water shelf, tableland margin, lagoon, tidal flat and tableland shallow sea. The Silurian lead-zinc deposits represented by the Sirengou deposit of Xunyang are of fine clastic sedimentary-strongly reworked type; the Devonian lead-zinc deposits represented by the Dalin and Zhaojiagou deposits of Xunyang are of carbonate sedimentary-weakly reworked type and the Devonian lead-zinc deposits represented by the Xitonggou and Yuexi deposits of Zhenan are of carbonate sedimentary-strong reworked type.
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Keywords:
- Zhenxun /
- Devonian /
- Silurian /
- lead-zinc deposit /
- metallogenic condition /
- deposit type
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