摘要
多年来地球化学方法主要用于圈定出露及亚出露矿化四周的地表次生分散晕和分散流找矿或圈定盲矿上方地表的原生晕找矿，取得极大效果，但对被厚层运积物或厚层成矿后沉积岩或火山岩埋藏的矿体，由于地表次生异常与原生晕皆被掩蔽而显得无能为力。８０年代以来发展了一些新的能有效探索被厚达数百米运积层及成矿后沉积岩或火山岩埋藏的矿体的“深穿透”地球化学方法，包括澳大利亚的ＭＭＩ方法，加拿大与美国的酶提取方法，前苏联的ＣＨＩＭ方法，瑞典的ＧＥＯＧＡＳ方法及中国的ＮＡＭＥＧ与ＭＯＭＥＯ方法。这些方法大多数是用于详查中，用在地质预测认为深部有远景或地球物理方法发现深部有某种异常，但又无法取得可靠的矿化直接证据的地区，而中国的ＮＡＭＥＧ与ＭＯＭＥＯ方法则既是战术性的，又可在找寻隐伏的大型、特大型甚至巨型矿床上发挥巨大的战略作用。文中列举了在乌兹别克斯坦穆龙套巨型金矿及澳大利亚奥林匹克坝巨型铜铀金银矿周围进行的战略性深穿透ＮＡＭＥＧ与ＭＯＭＥＯ测量的结果，笔者认为这种战略性与战术性深穿透地球化学方法的发展将会加速在隐伏区找到大型至巨型矿的进程，并为勘查地球化学在２１世纪开拓广阔的新的研究领域。
For many years exploration geochemistry has been focusing it′s effort on studying the various types of secondary dispersion halos, secondary dispersion trains and primary dispersion halos exposed on the land surface and has obtained many successes in discovery of ore bodies hidden beneath thick layer of residual overburdens or post ore rocks. But it′s not so efficient to discover ore bodies deeply buried beneath various kind of transported overburdens or post ore sedimentary and volcanic rocks. During the 1980′s and the 1990′s, various kind new geochemical techniques with the ability of deep penetration through thick exotic covers have been developed. Most of these new methods have been used in detailed surveys to delineate the probably deeply seated ore bodies which could not be ascertained by conventional geological, geochemical and geophysical surveys. But the Chinese NAMEG and MOMEO methods can be used both tactically and strategically. The strategic NAMEG and MOMEO surveys will play important role in the search of very large to giant ore deposits in concealed terrain′s. Results of such strategic deep penetration geochemical surveys around giant Muruntau Au deposit in Uzbekstan and around giant Olympic Cu U Au Ag deposit in Australia are given.
出处
《地学前缘》
EI
CAS
CSCD
1998年第2期171-183,共13页
Earth Science Frontiers
基金
国家科委攀登项目
关键词
深穿透
地球化学方法
汞气测量
金属活动态测量
deep penetration geochemical method, partial extraction technique, mercury vapor survey, earth gas, NAMEG(Nanoscale Metals in Eath Gas)method, MOMEO(MObile forms of MEtals in Overburden)survey
