SEDEX DEPOSIT GENESIS OF THE Pb-Zn DEPOSITS IN THE NORTHEASTERN MARGIN OF LANPING BASIN IN YUNAN: EVIDENCE FROM MINERALOGICAL AND SULFUR ISOTOPIC STUDIES
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摘要: 通过详细的野外地质工作和显微镜下观察，对云南兰坪盆地东北部维西—乔后断裂带上三叠统石钟山组(T3s)中产出的铅锌矿床成因进行厘定。研究结果表明，测区内存在大量典型的同生沉积矿床标志，如:纹层构造、条纹条带构造、网脉构造、黄铁矿条带软沉积构造、黄铁矿草莓状结构、黄铁矿胶状构造、闪锌矿同心环状构造等。青甸湾矿床金属硫化物硫同位素测试结果显示，黄铁矿的δ34 S介于3.7‰ ~ 8.1‰，均值5.34‰; 闪锌矿的δ34 S介于5.2‰ ~ 10.0‰之间，均值为7.18‰; 方铅矿的δ34 S介于5.2‰ ~ 9.9‰之间，均值为7.275‰，铅锌矿床硫来源于海水硫酸根无机还原。结合矿床形成时代及大地构造背景，认为该区铅锌矿为喷流沉积作用形成。Abstract: A series of lead-zinc deposits such as Qingdianwan, Caizidi, Jinshantao and so on, which are situated in the Upper Triassic Shizhongshan Formation (T3s) at the Weixi-Qiaohou fault belt, northeast of Lanping Basin. The genesis studies of these lead-zinc deposits are relatively superficial.. In this paper, through detailed field geological survey and studies under the microscope, authors found a large number of typical signs of the synsedimentary deposit such as laminated structure, striped band structure, vein net structure, the soft sedimentary pyrite band structure, strawberry-like pyrite structure, colloidal structure of pyrite, sphalerite concentric structure etc. Sulfur isotopes analysis results of metal sulfide in Qingdianwan deposit are following: δ34 S of pyrite at 3.7‰ ~ 8.1‰, average 5.34‰ (N = 5); δ34 S of sphalerite at 5.2‰ ~ 10‰, average 7.18‰ (N = 5); δ34 S of galena at 5.2‰ ~ 9.9‰, average 7.275‰ (N = 4). It demonstrates that S in the deposit come from deoxidize of sulfate radical in seawater. Combining to the age data of these deposits and the tectonic background, we think these deposits in this area are pertain to Sedimentary Exhalation (SEDEX) genesis which revised the previous viewpoint that these deposits simply controlled by structure.
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Key words:
- Lanping Basin /
- Sedimentary Exhalative deposit (SEDEX) /
- synsedimentary /
- mineralogy /
- sulfur isotope
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图 1 青甸湾—菜子地矿区大地构造位置及矿区地质图
Figure 1. A map showing the location and geological tectonics of Qingdianwan-Caizidi Mining
图 5 青甸湾矿床上三叠统灰岩Pb-Zn矿典型矿物结构
Figure 5. Typical mineral textures in the Upper Triassic limestone Pb-Zn deposit in Qingdianwan area
图 6 青甸湾矿床上三叠统灰岩Pb-Zn矿典型矿石构造
Py—黄铁矿; Sp—闪锌矿; Gn—方铅矿; (a) —方铅矿和黄铁矿呈不连续条带; (b) —黄铁矿条带软沉积形成的揉皱; (c) —硅质岩中网脉状方铅矿、细粒闪锌矿; (d) —黄铁矿条带软沉积形成的揉皱以及浸染状方铅矿和闪锌矿
Figure 6. Typical mineral structures in the Upper Triassic limestone Pb-Zn deposit in Qingdianwan area
图 7 青甸湾、灰山—黑山、金顶(北厂、架崖山)矿床硫化物硫同位素组成分布图
Figure 7. Distribution map of sulfur isotopic composition of sulfides from Qingdianwan, Huishan-Heishan and Jinding (Beichang, Jiayashan) deposits
表 1 青甸湾、灰山—黑山、金顶矿区(北厂、架崖山)硫同位素组成
Table 1. Sulfur isotopic composition in Qingdianwan, Huishan-Heishan and Jinding (Beichang, Jiayashan) deposits
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