海南岛卡林型金矿特征及成因分析

Characteristics and genesis analysis of the Carlin-type gold deposit in Hainan Island

海南岛已发现的31处金矿产地,属于卡林型金矿的有2处,分布在海南岛西南部的王下地区。赋矿地层为石炭系和二叠系,矿体受逆冲滑覆构造形成的断裂构造和倒转背斜层间破碎带控制。研究区内Au水系沉积物异常发育,异常区内成矿地质条件好。金矿石类型可分为方解石-石英复合脉型、蚀变岩型和构造角砾岩型三种。海南岛卡林型金矿矿源主要为石炭系,成矿时代主要为晚侏罗纪~晚三叠纪,根据成矿特征,总结了海南岛卡林型金矿的成矿阶段。

There are 31 gold deposits discovered in Hainan Island,of which 2 belong to the Carlin-type gold deposits,distributed in the WangXia area in the southwest of Hainan Island.The ore-bearing strata are Carboniferous and Permian,and the ore bodies are controlled by fault structures and overturned anticline interlayer fracture zones formed by thrust nappe structures.In the study area,Au stream sediment anomalies are exceptionally developed,indicating favorable geological conditions for mineralization within the anomalous area.The types of gold ores can be classified into three categories:calcite-quartz composite vein type,altered rock type,and tectonic breccia type.The Carlin-type gold deposits in Hainan Island mainly originate from the Carboniferous System,and the mineralization era is mainly from the Late Jurassic to the Late Triassic.Based on the metallogenic characteristics,the genesis of Carlin-type gold deposits in Hainan Island has been summarized.