投稿时间：2014-09-05
修订日期：2015-07-31
网络发布日期：2015-10-29
中文摘要:贵州普安泥堡金矿床位于右江盆地北西缘,其矿床特征、成矿作用具有较好的代表性。此次研究通过实测剖面、构造研究以及载金矿物原位成分分析,确定泥堡金矿体的产出主要受3个因素的影响:① 中二叠统茅口组灰岩与上二叠统龙潭组碎屑岩之间的不整合界面及其上下蚀变岩;② F1逆冲断层破碎带及其牵引二龙抢宝背斜;③ 分布于不整合面、断层破碎带和牵引褶皱内的含砷环带黄铁矿。针对这3个控矿因素展开的大地电磁测深(AMT)、可控源大地电磁测深(CSAMT)和时间域激电测深(TDIP)物探试验表明:AMT、CSAMT对不整合面反映最准确;TDIP对F1和二龙抢宝背斜内所含的黄铁矿等硫化物反映良好,可分别采取TDIP方法针对矿区南东侧破碎带型矿体,AMT或CSAMT方法针对矿区北西侧不整合面展开找矿工作。这种首先确定控矿因素,然后针对控矿因素展开物探试验确定适当物探手段,最终指导深部和外围找矿的方法,可广泛应用于针对金矿床二次找矿的工作中,具有实际的找矿意义。
Abstract:Located at the northwest edge of Youjiang basin, the Nibao gold deposit in Pu'an County of Guizhou Province has very representative characteristics in ore geology and metallogenesis among the regional gold deposits. However, it is now facing the crisis of further exploration. Based on the study of stratigraphy, structure, and modes of occurrence of gold, the authors have reached the conclusion that the formation of gold ore is controlled by ① unconformity between limestone of middle Permian Maokou Formation and clasolite of upper Permian Longtan Formation, ② thrust fault F1 and its drag fold Erlongqiangbao anticline, and ③ arsenic-bearing pyrite in the unconformity, fault zone and drag fold. In the light of these three factors, the author utilized audiomagnetotellurics (AMT), controlled source audiomagnetotellurics (CSAMT) and time domain IP (TDIP) sounding. The results show that the methods of AMT and CSAMT have precise responses to the unconformity surface, while the TDIP has sensitive response to the sulfides in the brecciaed zone of F1 and Erlongqiangbao anticline. Thus, TDIP can be applied to the prospecting for brecciaed orebodies in the southeast, while AMT and CSAMT can be applied to the prospecting for the layered orebodies in the unconformity surface. This method is of great significance and can be widely used in search for new orebodies regionally.
文章编号：
中图分类号：P618.51;P631
文献标志码：
基金项目:本文得到国家自然科学基金项目(编号:41402074)、中国地质调查局地调项目(编号:1212011094400)和四川省科技厅基础研究基金(编号:2015JY0055)联合资助
引用文本：
侯林,彭惠娟,张锦让,朱思豹,吴松洋,王家俊.2015.金矿床二次找矿的控矿因素研究与物探找矿方法试验——以贵州普安泥堡金矿床为例[J].矿床地质,34(5):895~912HOU Lin,PENG HuiJuan,ZHANG JinRang,ZHU SiBao,WU SongYang,WANG JiaJun.2015.Ore-control factors and geophysical method tests in second round prospecting for gold deposits: A case study of Nibao gold deposit in Pu'an County, Guizhou Province[J].Mineral Deposits34(5):895~912
图/表
