共查询到18条相似文献，搜索用时 93 毫秒
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30~#矿权区位于菲律宾迪纳加特岛北部,区内发育有红土型镍矿床。本次勘查圈定4处矿(化)体,其中以Ⅰ、Ⅱ、Ⅲ矿(化)体的矿化范围较大,厚度变化系数为45%~50%(相对稳定),经济价值较高。红土型镍矿体平面上呈地毯状展布于地表,厚度受地形控制,富镍矿体分布于矿权区东部的5、6、11、12小区;剖面上从地表向深部矿体为铁质红土层、松散红土层及高岭土化蛇纹石化橄榄岩层。30~#矿权区红土镍矿矿床的形成经历了从普通矿到富矿两个阶段,红土镍矿石属于酸性矿石。 相似文献
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《矿物学报》2013,(4)
红土型镍矿占世界上镍矿总储量的85%。近年来,红土型镍矿床找矿勘查工作在一些国家和地区取得了重要进展。本文较详细地总结了红土型镍矿床地质特征,分析了红土型镍矿床的矿化类型和成矿条件,并归纳出红土型镍矿床7个方面的关键找矿标志。红土型镍矿床按其成分和内部结构不同可分为褐铁矿带、粘土带、腐岩带及风化基岩带。根据不同带内镍矿化特征和载镍矿物特征,又可将红土型镍矿化分为硅酸盐型、粘土型和氧化物型3类。红土型镍矿床形成条件分析显示,富镍超基性岩是其形成的物质条件,热带-亚热带湿热气候是其形成的风化营力条件,地形-地貌和构造组合为镍元素活化-淋滤-沉积提供了通道和赋存空间,良好的物理化学条件提供了内在的成矿动力,稳定的大地构造环境为其形成后的保存提供保障。红土型镍矿床的关键找矿标志主要有富镍超基性岩发育的构造位置、风化壳发育、岩性为超基性岩、有利的地形-地貌、遥感-地球化学和地球物理异常区。 相似文献
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菲律宾AREA矿区红土镍矿为硫化镍矿岩体风化-淋滤-沉积形成的地表风化壳型矿床,矿体赋存在含矿风化基岩中。为圈定该矿区红土镍矿有利地段,依据岩(矿)石物性特征、矿体地质特征,采用对称四极电阻率剖面法(简称对称四极法)面积性测量,发现低阻异常;利用高密度电阻率测深法(简称高密度电法)剖面,对成矿有利地段进行评价并确定含矿层厚度和产状,圈定镍矿富集部位。工程验证结果表明,见矿较好位置与电法结果吻合较好。研究结果表明,红土镍矿勘探在前期工作中,采用电阻率法可圈定含矿层范围和延伸产状,有效缩小勘探范围,指导工程勘探布置,节约勘探成本。 相似文献
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X荧光分析技术在航磁异常地面查证中的应用 总被引：1，自引：0，他引：1
西天山135号航磁异常点由于地质条件的限制,大型勘查设备测量和探槽揭露工作很难开展;此外,受气候条件限制,适合查证工作的时间较短。因此,采用X荧光分析技术结合传统物探方法的技术路线,在航磁异常查证阶段综合采用地面高精度磁法测量、γ能谱测量、野外现场X荧光快速分析和岩样物性分析方法完成航磁异常的检查。根据野外X荧光分析发现135号航磁异常西南部有新的铜元素含量异常点,结合现场踏勘捡样发现孔雀石矿化现象,判断135号航磁异常西南部有铜矿化点的存在。在铜矿化区域通过大比例尺现场X荧光分析快速定位两处新发现的铜异常,并圈定了矿化范围;在工程验证阶段采用"以钻代槽"技术,结合X荧光分析和微区X荧光分析方法研究矿化展布特征、矿物成分,评价矿化价值。通过135号航磁异常查证工作,结果表明X荧光分析技术是一种快速高效、经济的勘探方法,能够缩短野外勘查周期,高效地完成异常查证及矿产勘查工作。 相似文献
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红土型镍矿床找矿勘查与开发利用新进展 总被引：3，自引：0，他引：3
随着全球经济和社会的高速发展,镍的需求量一直保持高位增长趋势。统计数据表明,全球的镍储量约为16亿吨,其中硫化物型镍矿占全部储量的28%,红土型镍矿占72%。鉴于硫化物型镍矿床以品位较高、杂质较少和选冶容易等特点,因此,全球58%左右的镍产量来源于此类矿床。随着硫化物型镍矿床开采量的大量增加和储量快速减少以及后备开采基地的严重不足,因此,人们将开发的重点瞄准了红土型镍矿床。红土型镍矿资源具有以下几个特点：①世界各国已探明的红土型镍的金属量为115亿吨,资源丰富;②无论是找矿勘查,还是矿体的采矿和选矿,其投入成本均很低;③火法冶炼工艺已在工业生产中得到运用,湿法冶炼技术（高压酸浸和堆浸）也正日趋成熟;④红土型镍矿床大多数位于赤道附近,多数临海,便于外运。我国西南和海南岛地区超镁铁质火成岩及其相应的风化层分布广泛,个别岩体（或层）的顶部或旁侧产出有红土型镍矿床（点）,因此,我国有关部门应对红土型镍矿床的找矿勘查和开发利用给予高度重视。 相似文献
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D. R. de Vletter 《Mathematical Geology》1978,10(5):533-542
Although two-thirds of the present nickel production is derived from nickel sulfides, lateritic nickel reserves are estimated
to be around three times as large as those of sulfides. This discrepancy is largely caused by the mineralogical complexity
of lateritic nickel which precludes low-cost beneficiation by conventional physical methods. Nevertheless, lateritic nickel
reserves are bound to become increasingly important because of expected metallurgical advances. Lateritic nickel deposits
were formed from peridotitic rocks on peneplaned surfaces during a tropical or subtropical climate. The most important deposits
were formed during the Tertiary and the lateritization process still continues in deposits situated in the present tropical
or subtropical belts. Other deposits, like those in East Europe and Greece, were formed during much older periods (Palaeogene-Cretaceous).
The various types of lateritic nickel deposits, covered or uncovered,in situ or transported, are listed and their characteristics briefly mentioned. Large differences exist in depth, grade, specific
gravity, and mineralogical composition—the latter especially in the nickel silicate section as opposed to the overlying limonitic
section. These large differences exist even within one individual mining area. Because of the mineralogical complexities and
highly irregular boundaries of lateritic nickel deposits (especially the upper and lower boundaries of the nickel silicate
section), thorough studies are required to determine the mineralogical composition and ratios of the components. Only then
may it be possible to specify with confidence the most suitable metallurgical process which has a strong bearing on the cost
and consequently the viability of the deposit. This condition makes the exploitability rating in the McKelvey classification
diagram relatively more difficult. Because of the quickly changing geological attributes of deposits even within limited areas,
it seems necessary to develop various deposit models for many, if not most, individual metallogenic regions. It does not seens
justified or practical to use estimation methodologies based on straight extrapolation. This is especially the case when dealing
with the young uncovered type of deposit which constitutes the bulk of global resources. Consequently methodologies no. I
(areal value estimation. Cargill, Meyer, Picklyk, Urquidi, 1977) and no. 2 (volumetric estimation) are not considered suitable.
It is thought that methodology no. 3 (abundance estimation) in conjunction with no. 5 (Delphi estimation) would work satisfactorily
but, as could be expected, the most meaningful results should come from a combination of methodologies nos. 4 (deposit modeling),
5 (Delphi estimation), and 6 (integrated synthesis). A classification of leteritic nickel deposit types is proposed.
This paper was presented at the International Geological Conclation Program (IGCP) Project 98: “Standards for Computer Applications
in Resource Studies” held at Taita Hills, Kenya, November 8–15, 1977. 相似文献
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Many nickel deposits are known in Brazil, accounting for about 350 · 106 tons of ore with an average of 1.5% Ni. All are of the lateritic type. These deposits are scattered throughout the country, being rarer in the Northeastern Region and in the South, below 25 °S latitude. They are mainly associated with mafic-ultramafic massifs of large dimensions and ultramafic alkaline complexes, and occur in climatic regions of contrasting seasons. The weathering profile developed over the fresh rock consists, from bottom to top, of the following horizons: altered rock, coarse saprolite, argillaceous saprolite, ferruginous saprolite and lateritic overburden. The thickness of each horizon varies from one deposit to another, the whole profile generally exceeding 20 m. The saprolitic horizons with inherited minerals (serpentine, chlorite) or neoformed minerals (smectites) constitute the silicated nickel ore and are thicker were climatic conditions are drier; the ferruginous upper horizons made up of iron oxide-hydroxides are more developed in more humid regions. In Brazil, the silicated ore generally prevails over the oxidized ore. The main Ni-bearing minerals are serpentine, smectite, garnierite and goethite. The lateritic nickel deposits of Brazil may be correlated with two erosion surfaces, corresponding to the Sul Americano (Lower Tertiary) and Velhas (Upper Tertiary) levelling cycles. The degree of dismantling of the higher and more ancient surface and the consequent development of the Velhas Surface control the position of the nickel accumulation in the landscape. Thus, the deposits may be found either in the lowlands or in the highlands, where they are always covered by a silcrete layer. The alteration profiles in the Brazilian lateritic nickel deposits are broadly similar to those described elsewhere in the world. However, they present two characteristic features: the silicated ore prevails over the oxidized ore, and a silicified layer covers the profies developed on the highlands. 相似文献
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原生矿床中金的主要性状有自然金与金的碲化物，自然金可分为“明金”和“微细粒金”，“明金”的次生作用，使金的成色得到提高，粒度更大，往往有利于残坡积型砂金矿床的形成，“微细粒金”的次生作用，常形成卡林型氧化金矿或红土型金矿和铁帽型金矿，显然，以“明金”为主的矿床及金的重砂异常区，不存在找红土型金矿的可能，应寻找脉金矿床，而在有低值金的重砂异常叠加的化探Au异常区，有望找到中小型红土型金矿床。 相似文献
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Lateritization processes of ultramafic rocks in Cretaceous times: The fossil weathering crusts of mainland Greece 总被引：1，自引：0，他引：1
The lateritic weathering crusts exposed in mainland Greece were developed on ophiolitic ultramafic lithologies during lower Cretaceous times. The lateritic profile consists of four zones: bedrock, saprolite clay (nontronite) and goethitic. The profiles show large variations in thickness, continuity, mineralogy and chemical characteristics. They are broadly similar to clay nickel laterite deposits. The uppermost gravelly ferruginous sector was eroded and the material reworked and redeposited partly on the lateritic crust. Silcrete layers, characteristic of groundwater silcretes, were formed into the clay and goethitic zones. Significant supergene nickel enrichments occur in the clay and saprolite zones, indicating that water moved downward to a very low water table. The structure and mineralogy of the weathering crusts indicates that environmental conditions were likely to have been dominated by alternating wet and dry periods. 相似文献
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章龙金矿既有原生型、又有红土型的共生金矿床。矿床受构造、地层、围岩制约。红土型金矿还受地形、残坡积层、风化壳发育程度影响。 相似文献
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湖北嘉鱼蛇屋山红土型金矿研究回顾与展望 总被引：1，自引：0，他引：1
蛇屋山红土型金矿是鄂东南地区规模最大的金矿,自该矿发现始,围绕该矿及类似矿床研究,已获得了大量的研究成果,但该矿床成因认识、成矿过程等方面仍存在许多争议。作者通过大量室内资料分析及野外进行实地调研,找出了该矿床研究中争议的焦点及各自依据,并介绍了与蛇屋山相关的国外同类矿床成因及勘查进展,蛇屋山金矿找矿研究工作部分进展,以期为该矿今后的科研和找矿工作提供新的思路,并认为该矿床远景有可能达到超大型矿床规模。 相似文献