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《International Geology Review》2012,54(12):1399-1404
We have studied the phenomena of modern gas formation based on data from volcanogenic-sedimentary formations in the southern part of the Atlantic Ocean and carbonate sediments of its eastern part, and also the terrigenous sediments of the Scotia Sea. A wide range of sedimentary facies has been established, in which the regular generation of gaseous hydrocarbons (including those heavier than methane) takes place. —Authors. 相似文献
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《International Geology Review》2012,54(10):1103-1107
A quasi-diffusion theory of origins of mechanical dispersion halos and a discussion of secondary (epigenetic) dispersion halos of ore bodies overlain by unconsolidated sediments are here presented, including the extent of migration of the ore substances by diffusion. --V. P. Sokoloff. 相似文献
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《International Geology Review》2012,54(6):984-989
An analysis of the control which fault tectonics on the Shamlug dome exercise on ore mineralization reveals that the largest chalcedony bodies occur along the crest of the dome, inasmuch as the largest tension fault displacements are found here. Alteration of shales to chlorite and/or sericite is restricted to reverse faults with small displacement which came into being in response to compressive stresses; these zones are barren, or, at best, the amount of chalcedony is meager.—M. E. Burgunker. 相似文献
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李坝金矿具有多期多阶段叠加成矿成晕的特点,根据不同成矿阶段元素组合和单阶段形成原生晕的垂直分带规律(从上→下是As,Hg,Sb→Ag,Pb,Au,Cu,Zn→Bi,Mn)及不同成矿阶段形成矿体(晕)在空间上的叠加特点,建立了矿床的原生叠加晕模式,确定了盲矿定位预测标志。 相似文献
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In the West Shasta district, California, flat-lying deposits of massive pyrite containing chalcopyrite, sphalerite, galena, and tetrahedrite occur within a section of unmineralized rhyolites and tuffs. Mercury was determined in residual soils derived from apparently unmineralized rocks at stratigraphic levels from 50 to 200 feet over known ore at the Early Bird, Keystone, and Mammoth mines. In each case, pronounced mercury anomalies were found. The mercury content of anomalous soils ranges up to 340 ppb (parts per billion, 10–9 g/g) over a background of 20 to 60 ppb.
Zusammenfassung Geochemische Untersuchungen im West-Shasta-Distrikt (California/USA) zeigten, daß über den bekannten, aber verborgenen Erzkörpern der Early Bird, der Keystone-und der Mammoth-Mine Quecksilber-Anomalien in Residualböden auftreten. Die flach liegenden, linsenförmigen Erzkörper bestehen aus massivem Pyrit, kleineren Mengen Kupferkies und untergeordnet Bleiglanz, Zinkblende, Fahlerz, Magnetkies und Magnetit. Sie werden von unmineralisierten Rhyolith- und Tuffhorizonten überlagert, die im Bereich der untersuchten Vorkommen etwa 20 bis 70 m mächtig sind. Anomale Bodenproben enthalten bis zu 340 ppb Quecksilber. Die Untergrund-Werte liegen in einem Bereich zwischen 20 und 60 ppb Hg.相似文献
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作为特提斯喜马拉雅新生代构造–成矿事件中最为典型的Pb-Zn矿化代表的扎西康铅锌多金属矿床,近年来新发现的XV号矿体,规模仅次于主矿体Ⅴ、Ⅵ号矿体,由于其发现时间晚,所以研究程度低。为了更好剖析该矿体地质特征,通过研究XV号矿体的元素分带特征,结果表明:① 矿体围岩地层对Pb、Ag、Sb元素有着良好的供给能力,但Zn的富集成矿与地层关系不大,铅锌矿化与一套完整的高温—中温—低温元素组合Hg、Ag、Sb、Bi、Pb、Sn、Cd、Cu、Mn及Zn密切相关。② XV号矿体主要由含矿热液携带成矿元素往上运移的过程中不断析出成矿,未见明显的叠加改造痕迹。③ 矿体深部仍然具有一定的成矿潜力。XV号矿体分带模型的建立,是对特提斯喜马拉雅新生代构造–成矿事件的良好响应,能较好代表在该事件下Pb-Zn矿化的普遍特征,同时在深部潜力预测等方面也具有重要的意义。
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大东沟银铅矿床多以石英脉型和蚀变岩型为主,与北东向构造有密切的关系,该文总结了矿床地质特征,分析了矿区内找矿潜力,确定了该区矿床的找矿标志。 相似文献
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《International Geology Review》2012,54(8):1331-1337
Granularometric control of tungsten concentrations in unconsolidated alluvial fan overburden — the concentrations were determined by spectrographic analysis — reveals that the lower and middle segments of the 0.25–5 mm particle diameter range exhibits the tungsten maxima, provided the clay is removed by washing. Consequently the 0. 25–-3 mm fraction, in the immediate vicinity of a quartz-tungsten vein complex, constitutes an economic deposit in most cases. — M.E.B. 相似文献
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安徽池州许桥银矿地质特征及矿区深部找矿方向 总被引:2,自引:0,他引:2
许桥银矿床位于长江中下游成矿带安庆-贵池矿集区东南部,矿床银储量达到中型规模,成矿岩体为分水岭石英闪长岩,矿体主要呈似层状赋存于分水岭岩体北东侧奥陶系仑山组、汤山组地层层间裂隙中;矿石矿物主要为黄铁矿、闪锌矿、方铅矿、黝铜矿、黄铜矿、辉银矿、自然银,脉石矿物为石英、碳酸盐矿物;矿石组构以自形-他形晶结构、交代结构、稀疏浸染状构造和网脉状构造为主;围岩蚀变类型主要有硅化、碳酸盐化、矽卡岩化、绿泥石化等;许桥银矿床成矿作用经历了两个成矿期:热液期和表生期,热液期又可分为三个成矿阶段,即为矽卡岩阶段、石英-硫化物阶段及碳酸盐-硫化物阶段;成矿流体早期以岩浆热液为主、晚期混有大气降水的流体演化特征;成矿物质主要来源于岩浆热液,地层贡献了部分矿质;成矿温度为中低温(208~259℃),矿床类型为中低温热液银多金属矿床,并指明了矿区深部找矿方向。 相似文献
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长江中下游成矿带铜陵矿集区内产出的姚家岭矿床地质特征复杂。由于种种条件制约,矿区地层,矿区构造,岩浆岩期次和控矿因素等重大地质问题仍有待进一步研究。铜陵有色金属集团股份有限公司在矿床详查和勘探工作的基础上,对矿床主要矿体进行坑探和井下钻探验证。本文结合最新的勘探工作,对矿床地质特征进行了系统的研究,查明了矿床的地质特征和主要成矿规律。提出姚家岭矿床具有三位一体和多层楼模式矽卡岩矿床特点,明确了接触带矽卡岩-斑岩型锌铜金矿体和在黄龙、船山组内层控型矿体的找矿方向,为矿区的勘探验证和深边部找矿提供了依据。 相似文献
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《International Geology Review》2012,54(2):205-217
Blind structurally controlled hydrothermal uranium ore bodies have definite geochemical expressions in their primary dispersion complex halos of lead, molybdenum, and soluble uranium extending over long distances upwards from the ores. Zonations in distribution-abundance of the three metals within the halos, as shown by orderly variations and trends in the ratios between the metals' concentrations, may serve by themselves as guides to the prospecting targets, under certain conditions — V.P. Sokoloff 相似文献