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鄂尔多斯盆地浩勒报吉淖全新世盐湖特征 总被引：1，自引：0，他引：1
本文论述了鄂尔多斯盆地北中部浩勒报吉淖全新世盐湖矿床特征,阐明了湖表卤水化学成分、盐度、水化学类型、pH值等地球化学特征,并对盐湖的沉积结构、含盐量变化、矿床物质组成进行了全面研究。对成矿条件作了探讨,为合理开发该矿床提供了科学依据。 相似文献
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陕西李家沟金矿地质特征及成矿地质作用 总被引：1，自引：0，他引：1
薛兰花 《有色金属矿产与勘查》1999,8(1):29-34
对李家沟金矿的区域地质概况,含矿断裂特征,矿床地质特征作了系统介绍,用推覆剪切成矿理论对矿床成矿作用的进行了分析,认为动力变质作用主导成矿,该矿床为推覆剪切带型混合热液矿床。 相似文献
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国内外层控改造型金锑钨综合矿床的成矿特征与成矿机理 总被引：1，自引：0，他引：1
本文概述了金锑钨综合矿床的分审、矿床类型及其演化特征,对其中主要矿床类型(层控改造型)的成矿地质特征作了较详细的讨论,笔者认为层控改造型金锑钨综合矿床包括沉积改造型和沉积变质型两大类,为同一成矿系列产物。这类矿床的形成经历了矿源形成与后期改造作用两个阶段,矿床的成矿演化与地壳演化有密切联系。 相似文献
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冷水坑银矿位于江西省贵溪县境内,是我国最大的银矿之一,矿床类型为斑岩型。本文从该矿床的成矿地质特征和地化特征出发,着重研究矿床微量元素的分布规律,初步总结了该矿床的地球化学找矿模式,并对该矿的发展及其方向作了预测。 相似文献
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个旧老厂锡矿的“锡石碳酸盐期硫化物迭加型”矿床,目前保有的地质储量占原生锡矿地质储量的3％。对该类型矿床的地质特征及工业利用,长期以来有着争议。该类矿床往往赋存于原生锡矿其它类型矿床之上部,不解决其利用问题,就直接影响下部矿床的勘探和开发。本文以老厂矿田I—4号矿体为例,通过重做坑内地质工作,对矿床的地质特征作了较深入的剖析,指出了锡矿化富集与两期矿化迭加和地层岩性、构造的关系;並对其工业利用作了一定程度的验证。 相似文献
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再论陕西宁强刘家坪块状硫化物矿床氧化带的特征及意义 总被引：1，自引：0，他引：1
笔者在1986年《西北地质》第5期发表了“陕西宁强刘家坪块状硫化物矿床铁帽特征及其意义”一文,主要对该矿床的地质特征、铁帽发育的特征等作了介绍。本文着重介绍该矿床围岩蚀变、影响氧化带发育的条件以及氧化带发育过程中的地球化学特征。试图探索氧化露头在评价原生矿床及普查找矿中的作用,以利于找矿。笔者囿于已见,欢迎批评指正。 相似文献
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我国层控多金属矿床的铅、硫同位素研究 总被引：4，自引：0，他引：4
在对我国南方泥盆纪层控矿床作了较系统的铅和硫的同位素分析测定工作的基础上,综合其他地区、不同时代层控矿床的同位素数据,本文试图对我国层控矿床的铅、硫同位素特征及其在矿床研究中的意义作一粗浅的讨论和总结。据30多个矿床或矿区统计,大约有铅同位素数据近300个,硫同位素数据500多个。这些同位素资料对解释该类型矿床的成因、物质来源、成矿时代、成矿地球化学环境以及指导找矿勘探都具有重要意义。 相似文献
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Trace elements in galena and sphalerite and their geochemical significance in distinguishing the genetic types of Pb-Zn ore deposits 总被引：3，自引：0，他引：3
Zhang Qian 《中国地球化学学报》1987,6(2):177-190
This paper deals with the trace elements Ag, Sb, Bi in galens and Fe, Mn, Cd, Se, Te, Ga and In in sphalerite from 60 Pb-Zn
deposits in China and other countries. The contents of the selected trace elements and their ratios show regular variations
from one type of Pb-Zn deposits to another. These elements or their ratios are plotted onto Pb-lnAg, lnSb-lnBi, lnGa-lnIn,
Fe-Cd, Fe-Cd-Mn and Zn/Cd-Se/Te-Ga/In diagrams. On the basis of these diagrams, the deposits associated with magmatism(type
I), those associated with volcanism(type II), the sedimentary-reformed deposits (type III) and sedimentary-metamorphic deposits(type
IV) can be well distinguished. Types I and III have the definite fields in all the diagrams. Types II and IV also have their
own fields in lnGa-lnIn and Zn/Cd-Se/Te-Ga/In diagrams. The author considers that these diagrams are applicable to distinguishing
the genetic types of Pb-Zn deposits. 相似文献
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鞍本地区鞍山群富铁矿成因类型的讨论 总被引：4，自引：0，他引：4
鞍本地区太古界鞍山群变质岩层中产出多层鞍山式铁矿,富铁矿均产在鞍山式铁矿的厚大贫矿层中。有人曾用“母大子肥”来比喻这种产出关系。本文认为厚大贫矿层是产出富矿的必要前提,但不是厚大贫矿层中均有富矿,即“母大”不一定“子肥”,还必须有后期成矿作用的叠加,才能造成“子肥”。这种后期叠加成矿作用主要是退化变质作用,有的地方混合岩化作用也造成小型富铁矿床。这两种叠加成矿作用的主要区分标准是:前者是在“封闭系统”条件下形成的富矿,矿石组分均来自含矿岩系本身,没有外来组分的加入;后者是在“开放系统”条件下形成的富矿,矿石组分中,有外来物质的加入。因此,富矿的形成必须具备两个条件:一是有形成厚大贫矿的有利层位;二是在厚大贫矿层中出现后期叠加地质 相似文献
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简论中国层控铜铅锌矿床的稳定同位素地球化学特征 总被引：2，自引：2，他引：0
摘要：层控矿床是构造运动、岩浆活动和沉积作用的综合产物,按其大地构造环境和沉积建造可划分为４大类、１３个亚类。层控矿床的稳定同位素组成按这一分类呈明显的规律性。不同建造中硫化物的硫同位素组成与其来源有关,并随后期叠加改造作用的增强而趋于均一。铅同位素组成反映了时代由老变新,由正常铅－混合铅－异常铅的演化规律,μ值也有增大的趋势,由幔源铅逐渐向壳幔混合型过渡。其含矿流体氢、氧同位素组成为建造水,显示了岩浆水与大气降水的混合,在不同建造类型中存在着较大差异,并随后期叠加改造作用的增强向混合含矿流体方向演化。总之,层控矿床的稳定同位素组成,其背景值反映了原始沉积环境,并明显地受沉积建造类型控制,后期叠加改造作用也可造成同位素组成的不同程度的变化。 相似文献
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A. Hallberg 《Mineralium Deposita》1989,24(4):250-257
The lead isotope composition of three Cu-Zn-Pb sulfide deposits and one Au deposit in the Early Proterozoic Svecofennian of central Sweden reveals the existence of two distinct lead sources in the region. Rockliden and Enstern contain lead of upper crustal affinity and are isotopically homogeneous. Lead in these deposits probably originates from Archean-derived detritus which was well homogenized by sedimentary processes and deposited over large areas as a component in Early Proterozoic sedimentary and tuffaceous rocks. Lead isotopic homogeneity within the Tjärnberget and Enåsen deposits is less pronounced, and the less radiogenic character of the lead suggests a source of mantle affinity. In areas where metasedimentary rocks are absent or contain very little Archean-derived material the isotopic signature of mantle-derived volcanic rocks is reflected in the ore lead. This approach is also applicable to other Svecofennian deposits. Together with deposits in west-central Finland the Rockliden deposit constitutes the northern boundary for lead of upper-crustal affinity, i.e., Archean-derived lead, in Svecofennian sulfide deposits.Despite these differences the isotope ratios of the four deposits indicate that they formed roughly contemporaneously with other Svecofennian deposits in Sweden and Finland. 相似文献
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五台山—恒山绿岩带Ａｕ、Ａｇ、Ｃｕ矿床可分为二大类型：（１）再生型金银铜矿，产在包括岩浆岩在内的各类岩石断裂构造中，与岩浆期后热液有关；（２）变生型金银铜矿，产于各类变质岩中，具有层控特征（即绿岩型金矿）。在地球化学特征上，再生型矿床与变生型矿床相比，矿体及围岩中Ｍｏ、Ａｇ、Ｐｂ、Ｚｎ、Ｃｄ等成矿及伴生元素明显富集；Ｋ２Ｏ、Ｒｂ、Ｓｒ、Ｂａ、Ｔｈ、Ｕ也明显富集，是后期岩浆热液作用的结果；Ｈｇ、Ｆ的明显富集则与后期构造活动有关；Ｚｎ／Ｃｄ比值较低，说明受到后期岩浆侵入影响；Ｔｈ／Ｕ比值低，可能指示富钙的酸性岩环境。再生型Ａｕ矿化的元素组合为Ｃｄ、Ａｓ、Ｎｉ、Ａｇ、Ｓｂ、Ａｕ、Ｈｇ（Ｂｉ），再生型Ａｇ矿化的元素组合为Ａｓ、Ｓｂ、Ａｇ、Ｃｄ、Ｃｕ、Ｎｉ（Ｍｏ、Ｐｂ、Ｚｎ、Ｂｉ），变生型Ａｕ矿化的元素组合较简单，只为Ａｕ、Ｈｇ、Ａｓ或Ａｕ、Ｃｕ。上述地球化学特征不仅可以有效地区分矿化类型，而且可以作为地球化学找矿和评价的指标 相似文献
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早子沟金矿位于西秦岭同仁—夏河—岷县金成矿带,矿区赋矿地层为三叠纪中统古浪堤组一段细碎屑岩,中性岩脉大量发育。矿体产于地层、脉岩及其接触带中,严格受断裂构造控制。本文通过对不同期次、不同矿石类型的黄铁矿进行分布、形态、矿物组合、元素组成以及硫同位素的研究,发现不同矿石类型的黄铁矿形成于不同的深度和地质环境;主成矿期黄铁矿以五角十二面体为主,常具碎裂结构;严重亏铁亏硫,ω(Au)/ω(Ag)=5.54,ω(Co)/ω(Ni)=4.2,类似于卡林型金矿特征,又兼有岩浆型矿床的特征;矿体中黄铁矿硫同位素δ34S‰变化范围-7.43‰～-8.62‰,与围岩黄铁矿硫同位素组成接近,说明硫主要来源于沉积地层,同时由于构造活动和岩浆侵入作用对硫同位素分馏产生了一定影响,使重硫有所富集。 相似文献
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P. Soler 《Mineralium Deposita》1987,22(2):135-143
About 1,500 samples of Pb and Zn concentrates and ores from 89 ore deposits of the polymetallic province of the Andes of central Peru have been analyzed. The distributions of Cd, In, Ge, Ga, Ag, Bi, Se, Hg, and Sn in these ore deposits can be reported on the basis of the typology of ore deposits, i.e., some types of ore deposits (syndiagenetic without associated volcanism and volcano-sedimentary of Triassic-Lias, exhalative sedimentary of Upper Jurassic) show very characteristic minor and trace element patterns; the temperature of ore formation that controls the abundance of Bi and Hg, in general, and of Ag, Se, and Sn in the Tertiary hydrothermal deposits; the age and nature of the country rock, e.g., an In, Ga, and Sn positive anomaly and Cd negative anomaly appears in the deposits with Paleozoic country rock; the geographic position of ore deposits, e.g., in the northern part of the province an In, Ga, Ge, and Cd positive anomaly appears. 相似文献
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论文给出了中国浙江火山岩区金矿床中黄铁矿的微量元素、形态和物理性质找矿标型特征.例如.(在许多)浙江火山岩区重要金-银矿床中黄铁矿相对富含铅、锌、钼、锡、砷、锑、铋而贫钴,镍、硒、碲:并且S/Se、Ag/Au、Pb/Ni、Se/Te、(As+sb+Bi)/(Se+Te)比值较高,Co/Nj、Ag/Pb、Ag/Zn、Cu/Zn和(Co+Ni)/(Pb+Zn)比值较低,再如含金黄铁矿比不含金黄铁矿的反射率低.总之,黄铁矿的标型性研究对于寻找金矿具有重大的理论意义和实际意义. 相似文献
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WANG Xiaohu SONG Yucai ZHANG Hongrui LIU Yingchao PAN Xiaofei GUO Tao 《《地质学报》英文版》2018,92(4):1486-1507
The Lanping Basin in the Nujiang‐Lancangjiang‐Jinshajiang (the Sanjiang) area of northeastern margin of the Tibetan Plateau is an important part of eastern Tethyan metallogenic domain. This basin hosts a number of large unique sediment‐hosted Pb‐Zn polymetallic deposits or ore districts, such as the Baiyangping ore concentration area which is one of the representative ore district. The Baiyangping ore concentration area can be divided into the east and west ore belts, which were formed in a folded tectogene of the India‐Asia continental collisional setting and was controlled by a large reverse fault. Field observations reveal that the Mesozoic and Cenozoic sedimentary strata were outcropped in the mining area, and that the orebodies are obviously controlled by faults and hosted in sandstone and carbonate rocks. However, the ore‐forming elements in the east ore belt are mainly Pb‐Zn‐Sr‐Ag, while Pb‐Zn‐Ag‐Cu‐Co elements are dominant in the west ore belt. Comparative analysis of the C‐O‐Sr‐S‐Pb isotopic compositions suggest that both ore belts had a homogeneous carbon source, and the carbon in hydrothermal calcite is derived from the dissolution of carbonate rock strata; the ore‐forming fluids were originated from formation water and precipitate water, which belonged to basin brine fluid system; sulfur was from organic thermal chemical sulfate reduction and biological sulfate reduction; the metal mineralization material was from sedimentary strata and basement, but the difference of the material source of the basement and the strata and the superimposed mineralization of the west ore belt resulted in the difference of metallogenic elements between the eastern and western metallogenic belts. The Pb‐Zn mineralization age of both ore belts was contemporary and formed in the same metallogenetic event. Both thrust formed at the same time and occurred at the Early Oligocene, which is consistent with the age constrained by field geological relationship. 相似文献