辽宁瓦房店地区原生金刚石矿地质特征与找矿方向

Geological Characteristic and Prospecting Direction of Primary Diamond Deposits in the Wafangdian Area, Liaoning Province

  • 摘要: 辽宁省南部的瓦房店地区是我国重要的原生金刚石矿产地,自1971年在该区发现金伯利岩以来, 金刚石矿找矿工作持续开展,目前已发现100多个金伯利岩体,其资源量占全国总量的50%以上。基于控矿因素研究得到新认识和勘查工作不断深入,在距离已开采的50号岩管外围约1 km、埋深近300 m处, 发现了被推覆构造错断的50号岩管的一段隐伏金刚石矿体。通过对本区金刚石矿勘查资料和研究成果的系统分析,认为瓦房店地区金伯利岩体呈成群成带产出特征,具有“构造控形定位”规律:成矿期断裂构造控制了金伯利岩体的分布和岩体初始形态,成矿期后推覆构造主导岩体现今空间形态,金伯利岩体的产出位置与构造盆地亦有一定的关系。本区金伯利岩体,不论是岩管还是岩脉均含有金刚石,其中岩管产出的金刚石晶体粒度和品质优于岩脉产出。同时,水系重砂指示矿物异常、密集节理带以及地磁异常是本区金刚石主要找矿标志。本研究认为,本区具有寻找隐伏矿体的巨大找矿潜力,已知金伯利岩体东侧是寻找受到推覆构造破坏的隐伏矿体的重要区域,岚崮弧南部的构造盆地是寻找隐伏金伯利岩体的重要区域。

     

    Abstract: The Wafangdian area in southern Liaoning Province represents a critical primary diamond producing region in China. Since the initial discovery of kimberlite in 1971, the diamond exploration in this region has continued uninterrupted. As of the current date, more than 100 kimberlite bodies have been discovered, contributing more than 50% of national diamond resources. Advanced understanding of ore-controlling factors recently revealed a concealed diamond ore segment of the pipe No.50, displaced by nappe structures at 300 m depth within 1 km of the operational kimberlite pipe No.50. Through systematic analysis of exploration data and research achievements, it has been concluded that the kimberlite bodies in Wafangdian area, Liaoning Province exhibit clustered distribution patterns with characteristic "structural control on geometry-emplacement". Syn-mineralization fault systems dictate original distribution and morphology, whereas post-mineralization nappe structures principally determine current configurations. Spatial correlations exist between kimberlite occurrence and structural basins. Diamonds in this region occur in kimberlite bodies, pipes and dikes, with those from pipes demonstrating larger crystals and superior quality compared to those from dikes. Key prospecting indicators include indicator mineral anomalies in stream sediments, dense joint zones, and geomagnetic anomalies. The study suggests significant potential for discovering concealed deposits, particularly in the eastern flank of known kimberlite bodies (for identifying nappe-disrupted concealed orebody) and the tectonic basins south of Langgu Arc (for locating concealed kimberlite bodies).

     

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