海南抱伦金矿床控矿构造特征及其对金矿化的控制作用
Ore-controlling structure and its control over gold mineralization in the Baolun gold deposit, Hainan
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摘要: 提要：抱伦金矿床是海南省新近发现的大型金矿床之一，属于成生于印支期受构造控制的岩浆热液型金矿床。矿区出露下志留统陀烈组浅变质岩系与白垩系红色碎屑岩，西北侧分布印支期花岗岩。北北东向豪岗岭断裂与其上盘的北北西向断裂破碎带组成矿区基本构造格架。磁组构分析显示矿区千枚岩以压扁变形占绝对优势，主压应力近东西向，矿化热事件前的构造变形较强，矿化之后的构造变形较弱。矿化期构造应力场为近东西向拉伸（主压应力近南北向）。北北西向断裂破碎带是主要赋矿（含矿）构造，对矿体的空间分布、形态产状起重要的控制作用。Abstract: Abstract：The Baolun gold deposit, as one of the large gold deposits found in Hainan Province recently, is a structurally controlled, magmatic-hydrothermal gold deposit formed in the Indosinian. In the gold district there outcrop the Lower Silurian Tuolie Formation low-grade metamorphic series and Indosinian red clastic rocks, and in addition Indosinian granite is distributed on its northwest side. The NNE-trending Haogangling fault and the NNW-trending fracture zone in the hanging wall of the fault form the basic structural framework of the ore district. Magnetic fabric analysis indicates that： flattening deformation predominates in phyllite of the district； the principal compressive stress is oriented in a nearly E-W direction； the structural deformation was stronger before the mineralization thermal event and weaker after mineralization. The structural stress field in the mineralization stage is featured by E-W extension (the principal compressive stress was oriented in a N-S direction). The NNW-trending fracture zone is the main ore-hosting (ore-bearing) structure, which exerts an important controlling effect on the shape, attitude, scale and special distribution of the gold orebodies.
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