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在沙泉子铜镍矿上方,开展土壤微细粒全量测量、金属活动态(粘土吸附态)测量及地电化学测量的试验工作。试验结果显示,三种方法圈定的成矿元素地球化学异常分布范围与深部隐伏矿体较为吻合,表明土壤微细粒全量测量、粘土吸附态测量和地电化学测量可以有效地指示隐伏铜镍矿体,可作为该区寻找隐伏铜镍矿的有效手段。  相似文献   
2.
深穿透地球化学方法在山东大尹格庄金矿区试验研究   总被引:2,自引:0,他引:2  
山东大尹格庄金矿埋深距地表距离大于200 m,属典型的隐伏矿床。选择大尹格庄金矿开展金属活动态测量、地球气测量、地电化学测量、土壤全量测量的方法,以检验深穿透地球化学方法勘查隐伏矿的有效性。试验结果显示:在埋深达300 m的隐伏金矿体上方发现了较明显的地球气、水提取与地电化学Au异常,异常与已知金矿体位置吻合程度较高,而土壤全量测量只在蚀变带头部有所反映,显示了深穿透地球化学方法在隐伏矿勘查中的良好应用前景。  相似文献   
3.
活动态测量中滤材的选择及其应用   总被引:1,自引:1,他引:1  
研究滤材对元素活动态测定结果及测定精密度的影响,综合考虑元素活动态测量结果的真实性以及土壤胶体的性质等因素,确定了2μm孔径的滤膜是用于活动态测量的较佳滤材,本研究对活动态测量方法的规范化、标准化具有重要意义。应用试验表明所选滤材适用于活动态测量。  相似文献   
4.
战术性与战略性的深穿透地球化学方法   总被引:43,自引:2,他引:41  
谢学锦 《地学前缘》1998,5(2):171-183
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。  相似文献   
5.
黑龙江省分布大面积森林沼泽,森林沼泽区地质工作困难且找矿效果差,笔者采用金属活动态测量方法,在“迅速掌握全局,逐步缩小靶区”战略思想的指导下,依次开展了超低密度(1个样/100 km2)地球化学调查→甚低密度(1个样/16 km2)地球化学调查→低密度(1个样/km2)地球化学详细测量→高密度(18个样/km2)异常定位测量等逐步缩小靶区工作。提交的部分靶区找矿效果较好,在地表覆盖层下部及深部发现Pb Zn工业矿体。研究总结的地球化学方法组合在森林沼泽区具有较好的找矿效果,该方法组合对今后这类地区的地球化学调查工作有较好的借鉴和参考意义。  相似文献   
6.
A procedure for sequential leaching of various mobile forms of metals in overburden (MOMEO) has been developed. Previous work showed that selective extraction techniques developed for base metals are ineffective for Au extraction. The mobile forms of Au in overburden occur not only as ionic or complex forms but also as ultrafine particles (submicron to nanometer) dispersed in, or bound onto, water-soluble salts, colloidal particles, organic matter, iron and manganese oxides or clay minerals. The conventional approach of partial leach methods, developed for base metals, involves using appropriate extractants to attack the host materials and release the trapped mobile forms of metals into solution. But the ultrafine Au particles thus released from the host are either insoluble in the mild extractant or reabsorbed by colloids. Therefore a two-stage selective leaching scheme has been developed for Au, a sequential leaching procedure to destroy the host materials, followed by a second treatment to place the Au released from the first stage into solution for analysis. This method has been used widely in detailed, regional and strategic exploration in overburden terrains. Case studies from different climatic and geographic settings show that selective leaching of optimum mobile forms of metals in different settings can be effective in finding indications of mineralization. In temperate alluvial terrains, water-extractable and adsorbed or exchangeable forms of metals give the most prominent expression. In arid sandy desert terrains, water-extractable metals and metals in oxides are the best indicators. In cold grasslands, organically bound and water-extractable metals are the most effective indicators of mineralization at depth.  相似文献   
7.
内蒙古半干旱草原区隐伏矿地球化学勘查方法试验   总被引:1,自引:0,他引:1  
在内蒙古半干旱草原区准苏吉花隐伏铜钼矿上方开展了土壤细粒级全量测量和金属活动态测量两种地球化学勘查方法的试验工作,结果显示,两种方法圈定的成矿元素主体异常分布范围与深部隐伏矿体的分布较为一致,表明土壤细粒级全量测量和金属活动态测量可以有效地指示隐伏铜钼矿体,可作为该景观区寻找隐伏铜钼矿的有效手段。  相似文献   
8.
This paper describes the use of NAnoscale Metals in EarthGas (NAMEG) and MObile forms of MEtals in Overburden (MOMEO) methods in regional scale geochemical exploration for giant deposits in terrains covered by overburden. These methods are based on the premise that gases generated from the earth's interior can not only transport mobile forms of elements from an ore deposit and its geochemical halos to the surface to form a local anomaly, but also transport them from distinct bedrock “geochemical blocks” hosting large and giant ore deposits and give rise to large regional geochemical anomalies and geochemical provinces at the surface.Regional NAMEG and MOMEO surveys for giant gold deposits were carried out in Shandong Province, where the largest gold deposits in China are found, and in the Muruntau region of the Kyzylkum Desert, Uzbekistan, one of the world's largest gold ore provinces.In Shandong Province, where most of the area is covered by complex overburden, large regional anomalies in earthgas and water-extractable Au were delineated over and around the giant gold deposits. For many trace elements, the anomalies are larger in area and have greater contrast than those from other methods. High concentration of water soluble Au extends into the southern area covered by transported overburden, suggesting that this region may have potential for the discovery of new concealed gold deposits. The anomalous provinces of Au in both earthgas and water soluble salts coincide with a deep fault, supporting the idea that the deep fault is the main conduit of Au from the interior.In the central Kyzylkum Desert, nearly all Au-hosting rocks are covered by sedimentary sequences overlain by desert sand. Gold and As anomalies over Muruntau and Kokpatas gold deposits have contrasts ranging from 2 to 400 times background. Strong anomalies were also discovered in the south of the Muruntau region, suggesting a promising area for the discovery of new giant gold deposits.  相似文献   
9.
干旱戈壁荒漠区地处我国西北部地区,天山、北山、祁连山三大多金属成矿带横贯其中,成矿条件优越,找矿尤其是找隐伏矿的潜力巨大,但受风成砂土的影响,很难获知覆盖层下方的矿化信息.穿透性地球化学已被证实是有效寻找隐伏矿的方法,其被定义为能探测深部隐伏矿体发出的直接信息的勘查地球化学理论与方法技术.笔者在花牛山铅锌矿开展土壤微细粒全量测量、金属活动态测量(水溶态测量、黏土吸附态测量、铁锰氧化物态测量)和地电化学测量多种穿透性地球化学勘查方法实测工作,结果表明,5种测量方法分析数据主成矿元素(铅、锌)异常衬度高,变异系数大,富集成矿可能性大,地球化学异常与深部隐伏矿体位置吻合,相比较而言,土壤微细粒全量测量效果最好,黏土吸附态测量、铁锰氧化物态测量和地电化学测量效果较好,水溶态测量效果稍差;所选方法技术针对干旱戈壁荒漠区寻找隐伏铅锌矿是有效的.气固介质中内生条件下的纳米金属微粒的发现为利用土壤作为采样介质的穿透性地球化学方法技术(土壤微细粒测量、金属活动态测量)提供了理论基础.电提取泡塑载体中大量的微米级的黏土矿物颗粒发现,以及微量元素异常与铁、铝等常量元素异常高度一致,初步推断地电化学测量提取过程是对黏土矿物颗粒选择性吸附过程.  相似文献   
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