摘要
铝在国民经济建设和发展中扮演着极其重要的角色,已被列入战略性关键矿产目录,铝土矿作为铝的主要来源,其勘探的紧迫性日益凸显。因此,构建有效的地球物理勘查技术方法组合对于快速寻找隐伏铝土矿具有重要的意义。本文针对沉积型铝土矿,提出地球物理勘探的主要目标是定位赋矿地层的顶、底界面。以云南大关县铝土矿为例,首先根据地质特征和物性特征,优选了音频大地电磁测深、高密度电阻率法、高密度极化率法和微动测量等四种物探方法开展实验研究。其次,根据各方法在该区的试验效果,结合地质资料与钻孔资料,讨论了各方法的勘查效果。最后,建立了“低电阻率、高极化、中高速度特征”的有利解释标志,并构建了小于150 m(AMT与高密度电阻率、极化率法)和大于150 m(AMT与微动测量法)两种不同深度的隐伏铝土矿的地球物理勘查技术方法组合。
Aluminum plays an extremely important role in the national economic development,and has been included in the list ofstrategic key minerals.As the main source of aluminum,the urgency of bauxite exploration has become increasingly prominent.Therefore,it is of great significance to study and construct an effective combination of geophysical exploration methods andtechnologies for the rapid search for concealed bauxite deposits.Aiming at sedimentary bauxite,this paper proposes that the mainobjective of geophysical exploration is to locate the top and bottom interfaces of ore-bearing strata.Taking the bauxite in DaguanCounty,Yunnan Province as an example,four geophysical exploration methods,namely audio magnetotelluric sounding,high-density resistivity,high-density induced polarization,and microtremor survey,are selected to carry out experimental research incombination according to geological and physical characteristics.Secondly,according to the experimental results of each method inthe area,combined with geological data and drilling data,the exploration results of each method are discussed.Finally,favorableinterpretation markers of"low apparent resistivity,high apparent polarization,and medium-to high-velocity characteristics"areestablished,and a combination of geophysical exploration methods for concealed bauxite deposits at different depths of less than 150m(AMT and high-density resistivity method)and greater than 150 m(AMT and microtremor survey method)is constructed.
作者
李富
夏时斌
梁生贤
王子正
郭阳
廖国忠
周邦国
陈子聪
LI Fu;XIA Shibin;LIANG Shengxian;WANG Zizheng;GUO Yang;LIAO Guozhong;ZHOU Bangguo;CHEN Zicong(Chengdu Center,China Geological Survey(Geosciences Innovation Center of Southwest China),Chengdu 610218,China;Yunnan Metallurgical Resources Co.,Ltd.,Kunming 650216,China)
出处
《沉积与特提斯地质》
北大核心
2025年第4期701-711,共11页
Sedimentary Geology and Tethyan Geology
基金
中国地质调查局项目(DD20240072,DD20230337,DD20240071,DD20242114)
西南地质科技创新中心刘宝珺院士基金。
关键词
铝土矿
音频大地电磁
激电
微动探测
bauxite
audio magnetotelluric
induced polarization(IP)
microtremor survey
