摘要:
云南鹤庆炉坪铅多金属矿床是新发现的一个大型隐伏矿床,位于北衙超大型金多金属矿床北部,属北衙金多金属矿田斑岩-热液成矿体系的组成部分,是该成矿体系中的新类型矿床。它是在充分研究区内基本地质条件,对比北衙矿区的成矿特点,认为在北衙向斜构造的轴部应该存在构造薄弱地带,能够为万硐山正长斑岩成矿体系中的成矿流体运移提供通道和赋存空间,同时结合良好的 Pb-Au-Ag-Zn-Cu-As-Sb 组合异常显示的观点指导下,通过钻探验证而发现的铅多金属隐伏矿床。矿体沿中三叠统北衙组灰岩与下三叠统腊美组砂泥岩层间及中三叠统北衙组灰岩内层间破碎带产出;矿石类型主要为氧化矿和混合矿,部分为硫化矿,其主金属元素为铅,伴生有金、银、铁、锌等多种有用组分;本文通过分析和总结该矿床的矿物学特征、有用组分的赋存状态及分布特征,提出了开发利用该矿床应加强进一步开展相关研究工作的建议。
Abstract:
The Luping lead polymetallic deposit in Heqing is a large-size concealed deposit discovered recently in Heqing, Yunnan Province. It is located on the northern side of the Beiya superlarge gold polymetallic deposit and is a component part and a new deposit type of the porphyry-hydrothermal ore-forming system of the Beiya superlarge gold polymetallic ore field. Based on a review of local geology and a comparative study of the mineralization characteristics of the Beiya deposit, the authors held that there should exist some unsubstantial structures in the axes of Beiya syncline which could provide the channel way and space for the ore-forming fluid from the Wandongshan orthophyre mineralization system. In combination with the existence of good combinatorial anomaly of Pb-Au-Ag-Zn-Cu-As-Sb in the area, the Luping lead polymetallic deposit was eventually discovered by means of drilling. The ore bodies of the deposit are hosted in the fracture zones within limestone of Middle Triassic Beiya Formation and sandstone-mudstone interlayered bedding of Qingtianpu Formation and limestone of Middle Triassic Beiya Formation. Ores of the ore deposit mainly consist of oxidized ores and mixed ores together with minor sulfide ores. The main metal component of the ores is lead along with some accessory components such as gold, silver, iron and zinc. Based on an analysis of the mineralogical characteristics as well as the distribution and modes of occurrence of useful components in the deposit, the authors put forward the suggestion that the relevant research work should be strengthened in further development and utilization of the ore deposit.
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