Geological characteristics and sulfur and lead isotopes of the Kanling lead-zinc deposit, Southern Tianshan Mountains
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摘要:
坎岭铅锌矿床是中国新疆南天山造山带内典型的铅锌矿床之一,矿床产于塔里木盆地西北缘柯坪隆起带内。通过野外地质调查和同位素研究发现:矿床具有后生成矿特征,赋矿围岩主要为上寒武统—奥陶系碳酸盐岩,矿体主要受构造和围岩控制,矿体形态以脉状、似层状和透镜状为主,矿石矿物组合简单,主要金属矿物为方铅矿和闪锌矿,围岩蚀变较弱。矿石S同位素组成分布较宽(δ34S=-1‰~12.2‰),硫主要来源于深部地幔及沉积地层;矿石Pb同位素组成较为均一,206Pb/204Pb值为17.262~17.269,207Pb/204Pb值为15.571~15.675,208Pb/204Pb值为38.062~38.396,通过对比矿石与主要赋矿围岩的Pb同位素特征,发现二者存在亲缘性,说明成矿金属主要由沉积地层供给。综合矿床地质、地球化学特征,初步认为坎岭铅锌矿床为赋存于台地碳酸盐岩中的MVT矿床。
Abstract:The Kanling lead-zinc deposit is one of the typical lead-zinc deposits in south Tianshan orogen, Xinjiang. It is located in the Kalpin uplift belt on the northwestern margin of the Tarim plate. Geological survey and isotope studies show that the host rocks of the deposit with epigenetic genesis are Upper Cambrian-Ordovician carbonate rocks, and the orebodies exhibit veined, stratoid and lenticular forms, mainly controlled by the fault and strata. Galena and sphalerite are the main ore minerals, with weak wall rock alteration. The characteristics of the sulfur isotope (in the range of -1‰-12.2‰) imply that the sources of sulfur was mainly derived from the deep mantle and sedimentary strata, the Pb isotopic composition of the ore is more homogeneous, and the 206Pb/204Pb ratios range from 17.262 to 17.269, 207Pb/204Pb from 15.571 to 15.675, and 208Pb/204Pb from 38.062 to 38.396; the ore-forming metals were mainly derived from the sedimentary strata as compared with the Pb isotopic characteristics of the ore and the host rocks. Geological and geochemical characteristics of the deposit indicate that the Kanling lead-zinc deposit is a MVT deposit, which is hosted in the platform carbonate rocks.
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Key words:
- deposit geology /
- sulfur and lead isotope /
- lead?zinc deposit /
- South Tianshan orogen
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图 1 坎岭地区大地构造位置图(a)(据张志斌,2007修改)和区域地质图(b)
Figure 1.
图 6 坎岭铅锌矿床S同位素组成(底图据Hoefs, 1980)
Figure 6.
图 7 坎岭铅锌矿床矿石铅同位素构造模式图(据Zartman et al., 1981)
Figure 7.
图 8 坎岭铅锌矿床铅同位素△β-△γ成因分类图解(据朱炳泉等,1998)
Figure 8.
表 1 坎岭铅锌矿床S同位素组成
Table 1. Sulfur isotopic composition of the Kanling lead−zinc deposit
表 2 坎岭铅锌矿床Pb同位素组成
Table 2. Lead isotopic compositions of the Kanling lead−zinc deposit
表 3 坎岭铅锌矿床与密西西比河谷型(MVT)型和沉积喷流型(SEDEX)铅锌矿床基本地质特征对比
Table 3. Basic characteristics of the Kanling lead−zinc deposit in comparison with MVT and SEDEX deposit
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