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原生晕垂向分带模型找矿法及其在铀矿勘查中的应用 总被引：1，自引：0，他引：1
原生晕指示元素垂向分带模型找矿法是通过发现、研究矿床原生晕指示元素垂向分带规律、建立指示元素垂向分带模型进行找矿的地球化学勘查方法。找矿实践表明,该方法可用于攻深找盲、推断矿体剥蚀程度、追踪矿体延伸方向,其找矿效果明显。有关该方法分带序列计算方法、分带模型以及在铀矿床(体)预测应用等方面已取得了较大进展。在分带序列计算方法方面,我国化探工作者提出的广义衬值法、浓集重心法,计算过程简单,值得推广。近年来该方法的重要研发成果——构造地球化学原生叠加晕评价技术在铀矿地质领域得到了广泛应用,可大大减小工作程度较高地区的化探工作量、降低勘查费用、缩短勘查周期,从而有效提升铀矿资源勘查的水平和能力。因此,该方法应用于铀矿勘查,其前景非常广阔。 相似文献
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Tourmalinites from the stratiform peraluminous metamorphic suite of the Central Namaqua Mobile Belt (South Africa) 总被引：1，自引：0，他引：1
A. P. Willner 《Mineralium Deposita》1992,27(4):304-313
Tourmalinites as proximal fades equivalents of stratiform peraluminous metamorphic rocks occur stratigraphically below base metal deposits and above thick metarhyolite horizons. Their premetamorphic protoliths are believed to have originated by tourmaline precipitation from exhalative B-, F- and W-rich brines also transporting aluminous clay colloids and dissolved silica. Tourmaline chemistry is used as an effective petrogenetic sensor. The tourmalines are Al-saturated, alkali-deficient dravite-schorl solid solutions, which are in the compositional range of tourmalines originated by exhalative processes. F-substitution in tourmalines is governed by Fe-F-avoidance. F is relatively enriched in the tourmalines and can potentially be used as a tracer for the source of primary hydrothermal solutions. Ti is introduced into the tourmalines by the substitution scheme Ti+AlIV=AlY+Si. The high Ti-contents of the tourmalines as well as those of coexisting muscovites represent evidence of high-temperature metamorphism. Many tourmalines exhibit continuous zoning, which can partly be attributed to external fluid influx near peak metamorphic conditions. 相似文献
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流体的沸腾和混合在热液成矿中的意义 总被引：67，自引：0，他引：67
讨论了流体沸腾和混合在热液成矿中的重要作用及研究进展。成矿汉体的降温可能不是许多金属矿物沉淀的最有效机制；流体的沸腾作用对浅成热液帮床，斑岩铜钼等矿床中矿物的沉淀作用很大，造成的矿化具有强度大，品位富及垂向分带较发育的特征，同时因其影响范围小，作用时间短，限制了它的作用的发挥。 相似文献
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本文在前人研究的成果基础之上,初步总结和归纳了鄂东南地区铜铁金等多金属矿床原生地球化学分带特征,同时建立了本区主要矿床类型组合及地球化学分带综合模式,讨论了区内典型矿床单、多层矿体元素分带特征及轴向分带模式在进行深部盲矿预测中的实际意义;提出了矿床中特征指示元素的指示意义及寻找盲矿的标志。 相似文献
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超大型金属矿床研究现状和某些进展 总被引：1，自引：0，他引：1
介绍了近年来超大型金属矿床理论研究现状,探讨了超大型铜、铅、锌、金和铂族等有色贵金属矿床的成矿构造背景,认为该类超大型矿床产出的主要全球构造背景为板块俯冲带和大陆裂谷,并论述了不同构造背景中超大型矿床的成因类型、矿床特征、控矿构造和矿床空间展布规律以及裂谷构造垂向分带和不同地史时期裂谷与超大型矿床的关系,对当前研究工作中一些问题进行了讨论。 相似文献
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The primary halos of porphyry copper deposits are characterized by compositional zoning in three dimensions. Two ideal zoning patterns can be divided in accordance with the shape of primary halos in space: bell-shaped and anticline-shaped. In the process of alteration-mineralization, K, Si, (OH), Fe, Cu, Mo, Ag, S, Ba, Rb, Pb, Zn, As, etc. were imported, while Na, Ca, Mg, Fe, Al, Ti, Mn, V, Co, Sr, Pb, Zn, etc. were exported or became activated, and then transported and reprecipitated. Both import and export of Fe, Pb and Zn may have taken place. The fundamental factors controlling the zoning of primary halos are: the stability of complexes and the activity of elements; pH, Eh, the behaviour of sulfur and the sulphophile character of elements; the concentration of components and the regularities of isomorphism; temperature and pressure; and tectonic setting and lithological characters of wallrocks. The authors consider that the zoning patterns of primary halos in porphyry copper deposits are the outcome of integrated effects of various factors. 相似文献
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A selective leach based on extraction with potassium chlorate-hydrochloric acid was used to investigate distribution of sulphide-iron and copper associated with the JA and Valley Copper deposits. Results emphasize patterns related to sulphide, versus total metal, and are shown to be consistent with mineralogical zoning in the deposits. 相似文献
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Representing the main source of copper in the world, porphyry copper deposits have been widely studied. Different models have tried to explain the observed metal zoning, but they did not completely explain it. A Permian Cu–Mo porphyry deposit in the San Rafael Massif in Argentina shows a similar metal zoning pattern to those described elsewhere. However, some particular features depart from the conventional cooling model. Based on data from this deposit and on theoretical background, we present and discuss Reverse Osmosis as a complementary process which could have contributed to porphyry metal zoning during the phyllic stage. The existence of potential-energy gradients and the different relative rejection values for distinct ions make Reverse Osmosis a natural mineral-concentration process. At temperatures corresponding to those of porphyry phyllic halo formation and in presence of a phyllic (clay) membrane, Cu, Ag, Zn and Pb would show a strong osmotic differentiation that could have led to the observed metal zoning. 相似文献
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为了研究甘肃寨上金矿南矿带矿体隐伏规律,预测深部找矿远景,基于构造叠加晕找矿方法对该矿床南矿带深部找矿潜力进行探讨。对南矿带32号脉9种金属元素(Au、Ag、As、Bi、Cu、Pb、Sb、W、Zn)的测试数据进行数学地质分析,结果表明Au与As具有较好的相关性,是找矿的指示元素;As与Sb、Cu与Bi的相关系数分别为0.586、0.945,可能与它们在热液上升过程中靠近矿体的头部和尾部有关。基于对矿区9种元素的数学统计分析并与中国金矿床原生晕综合轴向(垂向)分带序列对比,得到寨上矿区理想原生晕分带序列为:As-Sb(前缘晕)→Pb-Ag-Au-Zn-W(近矿晕)→Cu-Bi(尾晕);根据改良的格里戈良分带指数法得到各勘探线轴向分带序列,前、尾晕共存等“反分带”现象的出现表明存在多次热液叠加作用。使用克里金插值法得到衬值晕分带图,显示矿体向东倾覆,含矿热液应从东南向西北运移,剥蚀程度自东向西加强。在野外地质工作的基础上,结合矿区地质特征和元素空间分布规律,建立了南矿带构造叠加晕实用模型。根据原生晕找矿特征标志,32号脉东南部67线深处的有利成矿空间指示有矿,并将其定成预测靶位。通过布设钻孔ZK67-0验证了预测靶位的准确性,表明构造叠加晕实用模型在寨上金矿找矿预测具有可行性。 相似文献
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Wang Chengfa 《中国地球化学学报》1986,5(4):391-400
Two zoning patterns in tin deposits are proposed according to geochemical environments.
- Acidic zoning pattern is characteristic of tin deposits associated with sialic rocks and tin-bearing veins in carbonate rocks. Six zones may be recognized from the granite mass outwards: (1) Nb?Ta?(Li?Be?Mo), (2) Sn, (3) W?(Sn), (4) Cu?Pb?Zn?(Bi), (5) Sb?Hg, and (6) Au?Ag. This kind of zoning is related with the temperature difference involved in the deposition of various ore minerals in an acidic (or neutral) geochemical enviroment. From the granite outwards, the temperature decreases gradually with increasing distance from the heat source.
- Alkaline zoning pattern is typical of tin deposits occurring in calcareous and magnesian carbonate rocks. Three zones can be recognized from the granite mass outwards: (1) Cu?Zn?Bi, (2) Sn, and (3) Fe?Pb?Zn?Cu. A calcium-and magnesium-rich alkaline environment is responsible for this zoning pattern. In this case the normal sequence of mineral formation will be greatly changed owing to neutralization when an acidic ore-forming solution enters the alkaline environment.
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Mao Jingwen 《《地质学报》英文版》1989,2(2):175-187
Abstract This paper discusses the late Yanshanian-Himalayan igneous rock series and minerogenetic series (Cheng et al., 1979, 1982) related to tin polymetallic deposits in the Tengchong area. The multi-stage differentiation and evolution of the igneous rock series led to the concentration of metal and ore-forming elements in a cupola of a granite body formed in the late stage. The minerogenetic series shows a zoning of Nb-Ta-W-Sn, Sn-Fe and Sn around the cupola in space and a multi-stage regularity in time. Finally a minerogenetic model and three key factors of tin minerogenesis are put forward for tin polymetallic deposits in the area. 相似文献
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热液矿床原生晕具有明显的分带特征,其中含矿溶液在运动方向上显示出的轴向分带尤其重要,分带序列的建立对于评价隐伏矿体的规模、埋藏深度以及剥蚀水平有指导性意义,在很大程度上提高了地球化学找矿方法的找矿深度。针对黑龙江省三道湾子金矿,计算总结出轴向分带序列特征,确定矿体的前缘和尾晕指示元素以及分带性指数,结合矿区已知矿体对所研究矿脉剥蚀程度和深部成矿潜力进行评价。 相似文献
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本文从矿床地球化学特征和原生晕特征研究入手,查明了山门银矿床在三度空间上指示元素的分带规律,确定了元素的分带序列,以此为依据进行了深部隐伏矿预测。 相似文献
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贾公台金矿为甘肃党河南山地区规模最大的金矿床。为探索深部矿化、寻找盲矿体,在贾公台矿段开展原生晕研究,建立原生叠加晕轴向分带,发现贾公台金矿具反向分带特征。说明该矿体深部存在多期次成矿作用。结合地井五方位测井,预测深部3 200 m标高以下存在盲矿体。深部钻探发现了厚度大、品位高的多层金矿体,新增金资源量12吨,取得了显著找矿成果。构造叠加晕结合地井五方位测井成功圈定贾公台金矿深部矿体的实践,对同类矿床的深部找矿具有重要指导意义。 相似文献
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安徽沿江坳陷是长江中下游铁铜成矿带的重要组成部分,近10年来安徽新发现的具有较高经济价值的金属矿床几乎全都在该区。侵入岩体周边不同性质的围岩往往对矿床的类型具有控制作用;区域性深大断裂控制了成矿母岩的形成和分布,而具体的矿床构造(褶皱、断裂、接触带)控制着成矿有利空间(低压带)的分布;燕山中晚期中性-中酸性混熔型钙碱性岩浆岩不仅控制金属矿床的产出部位,还提供了成矿物质、热能,并产生成矿热液;矿床均围绕岩体分布,具有矿种和矿物组合等方面的水平-垂向分带;成矿时代为130~155 Ma,金属矿床分为玢岩型铁矿、夕卡岩型铁矿、斑岩型铜矿、夕卡岩型铜矿、层控型铁铜矿等5种矿床类型,各类型之间存在过渡、共生、叠加关系,构成中性-中酸性岩浆成矿系列。建议在今后的找矿工作中,要选好靶区、就矿找矿,加强中性-中酸性岩浆岩和控矿构造的研究,并注意技术方法的有效性与多解性。 相似文献