滇西北兰坪地区金顶超大型铅锌矿床架崖山-北厂矿段岩石地层特征
Lithologic stratum characteristics of the Jiayashan-Beichang profile of the superlarge Jinding Pb-Zn deposit in the Lanping basin，northwestern Yunnan, China
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摘要: 详细描述了滇西北兰坪金顶矿区架崖山-北厂主矿段露采剖面的岩石地层学特征。架崖山-北厂矿段出露正常沉积岩和非正常沉积岩两大岩石系列，分别由灰白色白云质灰岩、黑色泥晶灰岩、青灰色泥灰岩、杂色泥质粉砂岩、砖红色粉砂岩、红色膏溶角砾岩和浅灰色钙质砂岩、灰褐色灰岩角砾岩、杂色垮塌角砾岩组成。空间上以非正常沉积岩系列灰褐色灰岩角砾岩和浅灰色钙质砂岩为中心，正常沉积岩系列灰白色白云质灰岩、黑色泥晶灰岩、杂色泥质粉砂岩、青灰色泥灰岩和红色膏溶角砾岩分布于其周围。灰褐色灰岩角砾岩和浅灰色钙质砂岩构成了金顶矿区的2种主要矿石类型，二者空间上密切共生，近直立的灰岩角砾岩分布于近水平的钙质砂岩层的下部，构成似“蘑菇”状的几何形态。架崖山-北厂矿段岩石地层学的特征揭示了兰坪金顶铅锌矿泥底辟机制的成因特点，为矿区勘查和外围寻找金顶式矿床提供了新思路。Abstract: Lithologic stratum characteristics of the Jiayashan-Beichang profile of superlarge Jinding Pb-Zn deposit were described in this article. There are two lithologic series, normal and abnormal sedimentary rock.They consist of separately linen dolomitic limestone、black cryptite、dark brey marl、varicolored muddy argillaceous siltstoue、laterite siltstoue、red gypsum- karst breccia and light grey calcareous sandstone、dark brown limestone-breccia、varicolored collapsed-breccia. Normal sedimentary rock of dark brown limestone-breccia and light grey calcareous sandstone locate the center; abnormal sedimentary rock of linen dolomitic limestone、black cryptite、varicolored muddy argillaceous siltstone、dark brey marl and red gypsum- karst breccia located around it. The main ore types consist of dark brown limestone-breccia and light grey calcareous sandstone, and they are paragenetic relationship spatial. Vertical limestone-breccia located below horizontal calcareous sandstone, and formed typical “mushroom” shape. Lithologic stratum characteristics of the Jiayashan-Beichang profile show muddy diapire mechanism for Jinding Pb-Zn deposit, and it provides new clue to mineral exploration and search for Jinding-type deposite peripheral district.
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