| 西秦岭厂坝-李家沟铅锌矿矿床地质特征和成因分析 |
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| 引用本文：.2009.Geological characteristics and origin of Changba-Lijiagou lead-zinc deposit from western Qinling Mountains, China[J].Mineral Deposits,28(Z):123~127 |
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| 基金项目:国家科技部973项目“华北大陆边缘造山过程与成矿”课题（编号∶2006CB4035008） |
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| 中文摘要:厂坝-李家沟矿床规模巨大，是秦岭地区西成铅锌成矿带的重要矿床之一。矿体形态和规模明显受沉积洼地控制。矿石常显微莓球状、针状、他形隐晶质、显微球粒结构。可识别的矿石沉积-成矿作用构造有浸染-条带状、条纹-条带状、隐晶质条带、条块状、块状构造等。矿体中下部主要为块状矿石，富黄铁矿、闪锌矿、钠长石和石英；上部为条带状、浸染状和层纹状矿石，富闪锌矿、重晶石和方解石。条带状的石英钠长石岩和重晶石所含的典型喷气元素B和As的含量比正常沉积岩高出几倍到几十倍。闪锌矿中Zn/Cd比值>>500，黄铁矿中Co/Ni比值为0.2~0.8。该矿主要形成于受裂谷控制的克拉通内部及其边缘的沉降盆地。研究结果表明，厂坝矿具有较典型的Sedex型矿床特征。 |
| 中文关键词:地质学 铅锌矿床 矿床成因 热水沉积 Sedex型矿床 厂坝－李家沟矿床 秦岭 |
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| Geological characteristics and origin of Changba-Lijiagou lead-zinc deposit from western Qinling Mountains, China |
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| Abstract:The Changba-Lijiagou lead-zinc deposit is, due to its great reserve, one of the most important deposits in the Xi Cheng lead-zinc metallogenic belt, Qinling Mountains. The occurrence and size of its orebodies are obviously controlled by sedimentary depression. The ores have micro-framboidal, needle-shaped, aphanitic-anhedral and micro-spherulitic textures. The recognizable sedimentary and metallogenic structures of ores are disseminated-banded, striped-banded, anhedral-banded, stripped-massive and massive. The lower parts of orebodies are mainly composed of massive ores which are rich in pyrite, sphalerite, albitite and quartz. However, the upper parts of the orebodies mainly consist of ores with banded, disseminated and laminated structures, rich in sphalerite, barite and calcite. The contents of boron (B) and arsenic (As), which are considered typical exhalative elements, of banded quartz albitite and barite are much higher than normal sedimentary rocks. The ratio of Co/Ni in pyrite is between 0.2 to 0.8, with the ratio of Zn/Cd in sphalerite more than 500. Further more, the deposit mainly formed in the subsidence basin in a craton controlled by rift valleys. It is suggested that the Changba lead-zinc deposit is quite typical of Sedex type. |
| keywords:geology,lead-zinc deposit, metallogentic origin, hydrothermal sediment, Sedex deposits, Changba-Lijiagou, Qinling Mountains |
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