| 甘肃代家庄铅锌矿的地质特征与找矿意义 |
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| 引用本文：祝新友,汪东波,卫冶国,邱小平,王瑞廷.2006.甘肃代家庄铅锌矿的地质特征与找矿意义[J].地球学报,27(6):595-602. |
| DOI：10.3975/cagsb.2006.06.11 |
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| 基金项目:中国地质调查局科研项目(编号:G1999043200) |
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| 中文摘要:位于甘肃宕昌县的代家庄矿床曾被认为是西成矿田铅锌找矿的重大进展,矿床产于秦岭西成盆地西北端泥盆系浅海相的富含生物化石的细碎屑岩—灰岩中。矿体不规则受NW向断裂的控制,呈角砾状分布于下部碎屑岩与上部厚层灰岩界面附近灰岩一侧。矿石的矿物共生组合为闪锌矿 方铅矿 少量黄铁矿 少量白铁矿 方解石,不含石英。硫化物发育大量的胶状、球粒状、草霉状微晶结构,部分显现出微生物化石结构特点。对代家庄与西成主要类型铅锌矿床地质地球化学特征的对比发现,二者在容矿围岩沉积环境、矿石形态、结构构造以及同位素地球化学等多方面存在明显的差异,代家庄矿床成因属于碳酸盐岩容矿的低温热液矿床,不同于西成矿田的主要SEDEX类型。主要控矿因素为灰岩—碎屑界面附近、NW向断裂等。 |
| 中文关键词:甘肃 铅锌矿床 密西西比河谷型 硫同位素地球化学 |
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| Geological Characteristics of the Daijiazhuang Lead-Zinc Deposit in West Qinling, Gansu Province and Their Exploration Significance |
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| Abstract:The Daijiazhuang lead-zinc deposit with Pb Zn metal reserves over 300 thousand tones, is located in Dangchang of Gansu Province and occurs in fine debris and carbonate rocks within northwestern Xihe-Chenxian Devonian basin, one of the important lead-zinc producers in China. Ore bodies irregular in form are controlled by NW-trending faults along or near the interface between upper thick limestone and lower sandstone, with most of them hosted by limestone intercalated with breccias. Sulfide ore bodies are mainly composed of galena, sphalerite, calcite and minor amounts of pyrite and marcasite, with no quartz. The sulfide minerals in the deposit are fine-grained and concentrically-banded in form and exhibits a colloform, framboidal, and, subordinately, micro-fossil textures. Geological and geochemical studies show that differences exist between the Daijiazhuang deposit and the SEDEX lead-zinc deposits of Xihe-Chenxian area in sedimentary environment, ore rocks, sulfide structure, and sulfur and lead isotope geochemistry. The Daijiazhuang deposit is an epithermal deposit hosted by carbonate rocks, similar to MVT lead-zinc deposits. |
| keywords:Gangsu lead-zinc deposit MVT sulfur isotope |
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