广西凤山县林老平金矿地球化学特征与找矿

    Geochemical characteristics and prospecting of Linlaoping Gold Mine in Fengshan County, Guangxi Province

    • 摘要: 林老平金矿处于右江盆地,该盆地成矿条件优越,是寻找卡林型金矿的重点远景区。区内基岩出露少,传统的地质找矿方法在该区受到严重制约,但其丰富的水系和茂盛的植被,有利于水系沉积物和土壤的形成与保留,为次生晕的形成提供了基本条件。为了取得该区找矿突破,开展了1∶5万水系沉积物地球化学测量,圈定了AS-3巴岩(甲2类)和AS-8来花(乙2类)Au-As-Hg-Sb综合异常。通过异常查证工作,将两者分别进一步缩小为林那和来花1∶1万土壤Au-As-Hg-Sb异常,异常沿林老平背斜核部呈近SN向带状展布,与1∶5万水系异常吻合度高,元素套合性好。异常浓集中心经探槽(剥土)工程揭露,圈定了6条金矿体和8条金矿化体,查证为矿致异常。土壤Au-As-Hg-Sb异常浓集中心基本上反映了金矿(化)体的位置,是很有效的找矿指示元素。金矿(化)体直接赋存于林老平背斜核部断裂破碎带或其旁侧的次级裂隙中,硅化、褐铁矿化、黄铁矿化和高岭土化等与成矿关系密切。水系沉积物地球化学测量和土壤地球化学剖面测量方法在该区找矿效果显著,在右江盆地寻找卡林型金矿该方法值得借鉴。

       

      Abstract: The Linlaoping Gold Mine is located in the Youjiang Basin, which has superior mineralization conditions and is a key prospective area for searching Carlin-type gold deposits. The bedrock in the area is rarely exposed, and traditional geological prospecting methods are severely restricted in the area. However, its rich water system and lush vegetation are conducive to the formation and preservation of water sediment and soil, providing basic conditions for the formation of secondary halos. In order to make a breakthrough in ore prospecting in this area, a 1∶50 000 stream sediment geochemical survey is carried out, and the comprehensive Au-As-Hg-Sb anomalies of AS-3 Bayan (class A2) and AS-8 Laihua (class B2) are delineated. Through anomaly verification work, the two are further reduced to a 1∶10 000 soil Au-As-Hg-Sb anomaly in Linna and Laihua, respectively. The anomaly distributed in a nearly SN trending strip along the core of the Linlaoping Anticline, with high consistency with the 1∶50 000 water system anomaly and good element compatibility. The abnormal concentration is revealed through the exploration of trenches (soil stripping) engineering, and 6 gold ore bodies and 8 gold mineralization bodies are delineated, which are confirmed to be mine induced anomalies. The anomalous concentration center of soil Au-As-Hg-Sb basically reflects the location of gold mineralization bodies and is a very effective indicator element for mineral exploration. The gold ore body occurs directly in the fracture zone of the core of the Linlaoping Anticline or the secondary fissure on its side. Silicification, limonitization, pyritization and kaolinization are closely related to mineralization. The methods of stream sediment geochemical survey and soil geochemical profile survey have achieved remarkable results in ore prospecting in this area. The methods are worthy of reference in search for carlin-type gold deposits in the Youjiang Basin.

       

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