摘要
桂西北(广西的西北部)地区是我国80年代以来新发现的超微粒型金矿很有前景的成矿地区,是国内盛产黄金的"滇黔桂金三角"的重要组成部分。面积大于30000km^2。已发现金矿床、矿点和异常近300处。金矿主要产在中三叠统板纳组浊积岩中,与世界首次发现的美国卡林超微粒型金矿,在赋矿围岩(碳酸盐)等方面有明显差别。本区位于滨太平洋构造和古特提斯构造的复合部位。在海西—印支期曾出现轴向为北西西向的桂西边缘裂陷盆地。中三叠统板纳组主要是一套陆源碎屑浊积岩,以白云质泥岩、泥砂质泥岩、粉砂岩为主。
Northwestern Guangxi is a prospective area for micrograined-disseminated gold deposits since 1980s in China.The gold deposits lie majorly in the turbidite of Baipeng formation of Middle Triassic.Tectonicly,the area is located in the complex zone which is compounded by the Peri-Pacific zone and Palaeotethyan belt.Western Guangxi marginal sag basin with NW axial trending occurred in Hercynian-Indosinian period.The uplift zone of upper mantle along Youjiang River corresponds to the deep depression of the sag basin.Being the first-class ore-controlling structure,it controled two submarine uplifts in Triassic,the carbonate platform of Late Palaeozoic,two concealed graricte zones,and two NW-strike gold ore zones.The comprehensive model for gold mineralization is established guantitatively or semiquantitatively by geology,geophysics,and geochemistry in graphic chart.
出处
《广西地质》
1996年第1期143-152,共10页
Guangxi Geology