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1.
贵州省从江县高增锰矿矿床地质特征及成因浅析 总被引：1，自引：0，他引：1
从江县高增锰矿严格受控于地层层位和古构造,矿体呈层状、似层状产于南华系大塘坡组底部灰色、浅黑灰色含炭粉砂质粘土岩中,本文总结分析了高增锰矿床矿床地质及矿石质量特征、分析研究成锰期沉积环境,认为该矿床属浅海海湾相沉积型碳酸锰矿床,为黔东及邻区又一典型南华纪“大塘坡式”锰矿床。 相似文献
2.
西秦岭金龙山卡林型金矿床地质-地球化学及矿床成因研究 总被引：1，自引：0，他引：1
金龙山金矿床位于南秦岭造山带的复理石褶冲带中,赋矿围岩为碎屑岩-碳酸盐建造,矿化明显受地层岩性与韧-脆性构造发育程度的控制。矿床稀土元素地球化学研究表明,地层岩石、矿石和热液矿物的轻重稀土分异程度和特征参数基本一致,表明成矿流体应主要来自于赋矿地层。铅同位素研究表明,地层岩石、矿石和热液矿物均具有较高的放射性成因的铅同位素组成,且均落入南秦岭造山带的泥盆系范围内,暗示铅也主要来自赋矿地层。对前人已有的碳-氧-硫-氢同位素组成和流体包裹体数据综合分析表明,碳和氧应主要来自海相碳酸盐的溶解作用,硫主要来自海相硫酸盐的热化学还原反应;从成矿早阶段到晚阶段,成矿流体的δ18O及δD值向大气降水线＂漂移＂,指示成矿流体以盆地建造水和变质水为主,在晚阶段有大气降水加入。金龙山金矿床与卡林型金矿床的矿床地质-地球化学特征相似,应属于卡林型金矿床,其形成于秦岭造山带陆内造山作用过程中,多层次陆壳叠置加厚的地球动力学背景,是陆内碰撞造山作用的产物。 相似文献
3.
《Russian Geology and Geophysics》2007,48(5):389-399
Complex study and comparative analysis were carried out for two gold deposits, Vodorazdel’noe and Ondol’toi, localized among carbonate and siliceous-carbonate rocks of the Il’chir Formation in southeastern East Sayan. The Vodorazdel’noe deposit is of gold-quartz-sulfide type; it formed at 275–300 °C with the participation of highly concentrated chloride fluids and bears low-fineness gold associated with quartz-sulfide mineralization. In sulfur isotope composition (δ34S) the deposit ores are similar to sulfides of hydrothermal structures of slow-spreading ridges.The Ondol’toi deposit is formed by low-sulfide carbonate breccias and hematitized jasperoids. This deposit is localized in the frontal zone of a large thrust and bears gold-sulfide mineralization (fine-grained sulfides and submicron gold in siliceous-carbonate rocks and jasperoids). It is characterized by the presence of brecciated rocks and high contents of Hg, Sb, Ba, and Fe both in ores and in the host rocks. The established geologic, mineralogical, and geochemical features of the deposit permit it to be assigned to the Carlin type. 相似文献
4.
本文采用石墨炉原子吸收光度计测定了甘肃阳山金矿岩（矿）石中金的5种化学相态（可溶相、游离自然金、碳酸盐相、硫化物相和硅酸盐相）的质量分数,并分析了其在不同类型的岩（矿）石和不同时代地层中的分布特征。结果表明：区域岩石中的金主要以硅酸盐相存在,占总量的57.6%;矿石中的金主要以硫化物相存在,占总量的56.9%;与岩石中金的相态分布对比,矿石中硫化物相金、游离自然金和碳酸盐相金所占比例明显偏高;可溶相、游离自然金、碳酸盐相和硫化物相是阳山金矿成矿有利相态;赋矿地层金的成矿有利相态所占比例明显高于其他地层,即使金的合计与其他地层相近甚至较低。可根据成矿有利相态所占比例判断地层成矿潜力,这为岩石地球化学的异常评价提供了新的依据。 相似文献
5.
上庄坪铅锌银矿床是新一轮国土资源大调查中在北秦岭二郎坪群发现的硫化物矿床。笔者通过对矿床矿石、容矿同岩、重晶石岩的微量、稀土元素地球化学特征分析和地质特征研究,探讨成矿构造环境、成矿物质来源及矿床成因问题。研究表明.矿石和容矿围岩稀土元素球粒陨石标准化组成模式均为右倾型.矿石与围岩在Cu-Pb-Zn判别图解中投点区域一致.矿石Zn/(Zn Pb)与冲绳海槽和上向黑矿矿石特征相似、与TAG和EPR13°N区硫化物存在差异.矿石具较高As、Sb和Pb与低Cu、Cd和Se元素特征.认为该矿床成矿元素来源于壳幔混合、但以壳源为主的围岩变(石英)角斑岩和变细碧岩。矿石稀土元素、微量元素地球化学特征、矿床地质特征及与热水沉积重晶石岩和硅质岩的紧密共生关系说明,上庄坪矿床是弧后盆地构造环境海底热液喷流成岩成矿作用的产物。重晶石岩、硅质岩、矿床纵向和横向分带是寻找和勘探该类矿床的重要标志和依据。 相似文献
6.
A. I. Brusnitsyn 《Geochemistry International》2013,51(8):623-645
The Parnok ferromanganese deposit is confined to the black shales of the western slope of the Polar Urals. The deposit area is made up of weakly metamorphosed terrigenous-carbonate rocks formed in a marine basin at a passive continental margin. Ore-bearing sequence is composed of coaliferous clayey-siliceous-calcareous shales comprising beds and lenses of pelitomorphic limestones, and iron and manganese ores. The iron ores practically completely consist of micrograined massive magnetite. The manganese ores are represented by lenticular-bedded rocks consisting of hausmannite, rhodochrosite, and diverse manganese silicates. With respect to relations between indicator elements (Fe, Mn, Al, Ti), the shales are ascribed to pelagic sediments with normal concentrations of Fe and Mn, the limestones correspond to metalliferous sediments, ferruginous sediments are ore-bearing sediments, while manganese rocks occupy an intermediate position. It was found that the concentrations of trace elements typical of submarine hydrothermal solutions (As, Ge, Ni, Pb, Sb, Zn, etc.) in both the ore types are in excess of those in lithogenic component. At the same time, the indicator elements of terrigenous material (Al, Ti, Hf, Nb, Th, Zr, and others) in the ores are several times lower than those in the host shales (background sediments). REE distribution patterns in iron ores show the positive Eu anomaly, while those in manganese ores, the positive Ce anomaly. In general, the chemical composition of the ores indicates their formation in the hydrothermal discharge zone. The peculiar feature of the studied object is the manifestation of hydrothermal vents in sedimentary basin without evident signs of volcanic activity. Hydrothermal solutions were formed in terrigenous-carbonate sequence mainly at the expense of buried sedimentation waters. The hydrothermal system was likely activated by rejuvenation of tectonic and magmatic processes at the basement of sedimentary sequences. Solutions leached iron, manganese, and other elements from sedimentary rocks and transported them to the seafloor. Their discharge occurred in relatively closed marine basin under intermittent anaerobic conditions. Eh-pH variations led to the differentiation of Fe and Mn and accumulation of chemically contrasting ore-bearing sediments. 相似文献
7.
The Parnok deposit is made up of stratiform lodes of iron (magnetite) and manganese (oxide-carbonate, carbonate, and carbonate-silicate) ores localized among terrigenous-carbonate sediments (black shales) on the western slope of the Polar Urals. The lithological study showed that ore-bearing sediments were accumulated in a calm hydrodynamic setting within a relatively closed seafloor area (trap depressions). Periodic development of anaerobic conditions in the near-bottom seawater was favorable for the accumulation of dispersed organic matter in the terrigenous-carbonate sediments. Carbon required to form calcium carbonates in the ore-bearing sediments was derived from carbon dioxide dissolved in seawater. In the organic-rich sediments, carbonates were formed with the participation of carbon dioxide released by the destruction of organic matter. However, δ13C values (from 0.5 to ?4.4‰ PDB) suggest a relatively low fraction of the isotopically light biogenic carbon in the host calcite. The most probable sources of Fe and Mn were hydrothermal seepages at the seafloor. The Eh-pH conditions during stagnation were favorable for the precipitation of Fe and accumulation of Mn in a dissolved state. Transition from the stagnation regime to the concentration of oxygen in near-bottom waters was accompanied by oxidation of the dissolved Mn and its precipitation. Thus, fluctuations in Eh-pH parameters of water led to the differentiation of Fe and Mn. Initially, these elements were likely precipitated as oxides and hydroxides. During the subsequent lithification, Fe and Mn were reduced to form magnetite and rhodochrosite. The texture and structure of rhodochrosite aggregates indicate that manganese carbonates already began to form at the diagenetic stage and were recrystallized during the subsequent lithogenetic stages. Isotope data (δ13C from ?8.9 to ?17.1‰ PDB) definitely indicate that the oxidized organic matter of sediment served as the main source of carbon dioxide required to form manganese carbonates. Carbonates from host rocks and manganese ores have principally different carbon isotopic compositions. Unlike carbonates of host rocks, manganese carbonates were formed with an active participation of biogeochemical processes. Further processes of metagenesis (T ≈ 250–300°C, P ≈ 2 kbar) resulted in the transformation of textures, structures, and mineral composition of all rocks of the deposit. In particular, increase in temperature and pressure provided the formation of numerous silicates in manganese ores. 相似文献
8.
在广西东平碳酸锰矿含锰岩系中发现Ga含量高异常,Ga含量为5.16×10-6~82.80×10-6,平均含量为33.76×10-6,达到了Ga矿资源工业品位标准要求,但目前还未见有产Ga锰矿床的报道.为了提升对此富Ga现象的认识,对其进行了碳、氧同位素特征研究.结果显示:矿石和围岩δ13CPDB值分别为-6.40‰~-2.20‰、-8.90‰~0.90‰,δ18OPDB值分别为-9.00‰~-7.90‰、-9.90‰~-3.90‰.研究表明:（1）有机质参与了碳酸锰矿形成;（2）含锰岩系为热水沉积成因,Ga来源与海底热液活动密切有关;（3）海底热液活动一方面为形成锰碳酸盐直接或间接提供了大量有机质,另一方面为形成富Ga含锰岩系带来了大量Ga,被锰的氧化物或氢氧化物、海洋生物（多为热液微生物）所吸附、富集,经复杂的成岩、成矿作用而最终赋存于含锰岩系之中形成富Ga含锰岩系. 相似文献
9.
10.
V. N. Kuleshov 《Lithology and Mineral Resources》2011,46(5):473-493
Major regularities in the formation of manganese rocks and ores have been established on the basis of available published
and original data. The proposed genetic classification of main manganese deposits (with model examples) is as follows: sedimentary-diagenetic
(Nikopol, Bol’she-Tokmak; Ukraine), (volcanogenic) hydrothermal-sedimentary (deposits of the Atasui area, Kazakhstan; Magnitogorsk
Trough, South Urals), epigenetic (catagenetic) (deposits of the Kalahari manganese ore field, South Africa; Usinsk deposit,
Kuznetsk Alatau), and supergene (residual, infiltrational, cavern filling, and pisolitic deposits in India, Brazil, South
Africa, and Australia). The results suggest the following conclusions: (1) all primary manganese rocks and ores at the known
deposits are hydrothermal- and diagenetic-sedimentary formations of marine environments; (2) manganese concentrations achieve
the size of deposits at postsedimentary stages of the initial manganiferous sediment and manganese rock transformation (diagenesis,
catagenesis, and retrograde diagenesis); (3) indispensable participation of the isotopically light carbon dioxide related
to the destruction of organic matter (OM) is a characteristic feature of manganese carbonate formation during diagenesis;
and (4) the role of organic carbon in manganese ore formation becomes notable since early stages of Mn accumulation in the
Precambrian sedimentary basins (terminal Archean-initial Early Proterozoic). 相似文献
11.
Organic Geochemistry of Sedimentary Rock-hosted Disseminated Gold Deposits in Southwestern Guizhou Province, China 总被引：2，自引：1，他引：1
Jayanta GUHA 《《地质学报》英文版》2005,79(1):120-133
Sedimentary rock-hosted disseminated gold (SRHDG) deposits in the Youjiang-Nanpanjiang Basin,southwestem Guizhou Province are commonly hosted by the same fold crests that commonly contain a remarkable amount of organic material. The total organic carbon (TOC) contents of the ores and host rocks are usually less than 1%. The reflectance of vitrinite and pyrobitumen in the ores and the host rocks ranges from 1.5% to 4.5%, often in the range of 2% to 3%. In the Lannigou deposit, the reflectance of vitrinite and pyrobitumen in the ores is usually somewhat higher than those within the host rocks, indicating a hydrothermal impact on the organic matter in the altered host rocks. On the contrary, the estimated maximum paleotemperatures of the Getang and Zimudang deposits are higher than the homogenization temperatures of the fluid inclusions in the ores, signifying that the organic matter maturation predated Au mineralization. No correlation between the organic matter contents and Au concentrations were recognized in the ores.However, the most striking observation is that there is a positive correlation between the $2 (a parameter of Rock-Eval analysis), Au and As contents of the ores in the Lannigou deposit. Organic matter maturation and migration is apparent from the TOC vs. HCI diagram. Furthermore, group analysis of the dichloromethane extractable organic component of the ores and host rocks shows that the maturation degree of the organic matter in the ores is slightly higher than that of the host rocks in the Lannigou gold deposit. However, the compositions of their alkanes, steranes and terpenes, which serve as biomarkers, are quite similar; this suggests that the organic matter found in the ores and host rocks has a common marine source. Organic matter probably contributed to the preconcentration of Au in the host rocks. Hydrocarbons in the system,on the other hand, clearly contributed to the emplacement of the gold mineralization through thermal sulfate reduction.Organic matter in the solution might have increased the potential of the hydrothermal solution to transport Au. 相似文献
12.
The South Faizuly manganese deposit hosted in cherty rocks of the Magnitogorsk paleovolcanic belt has been studied. The geology, mineralogy, and chemistry of ores and host silicites (jasperites, jaspers, and cherty siltstones) are characterized. The deposit was formed in the following four consecutive stages: (1) sedimentation and diagenesis of ore-bearing sediments in the Middle Devonian, (2) metagenesis of Mn-bearing rocks in the Middle Devonian-Early Carboniferous, (3) hydrothermal-metasomatic stringer ore mineralization during tectonic deformation of volcanosedimentary rocks in the Middle Carboniferous-Permian, and (4) supergene alteration and partial denudation of the deposit in the Mesozoic-Quaternary. Models of Mn-bearing rock deposition in the proximal and distal zones of the hydrothermal solution discharge area are considered.Translated from Litologiya i Poleznye Iskopaemye, No. 1, 2005, pp. 35–55.Original Russian Text Copyright 2005 by Brusnitsyn, Zhukov. 相似文献
13.
REE distribution patterns of the ores and host rocks of the Dzhimidon vein lead-zinc deposit (North Caucasus, Ossetia, Sadon mining district, Russia) have been analyzed to estimate ore sources of hydrothermal deposits. It is established that both types of prevailing rocks of the Sadon Area are involved in the formation of base-metal ores during activation of hydrothermal metasomatic processes in the Jurassic time, the said rocks are Paleozoic granites (the main ore-hosting rocks at the majority of deposits) and Pre- Cambrian schists (specific for only ore-hosting rocks of Dzhimidon deposit). 相似文献
14.
Huanzhang Lu 《中国地球化学学报》1983,2(1):45-57
The Fankou Pb-Zn ore deposit occurs in Devonian and Carboniferous carbonate rocks. This deposit was thought to be a hydrothermal ore deposit related to a granite, but the present research suggests it is a stratabound, stratiform mineral deposit. As a result of geological studies, primary sedimentary and later replacement features were found. Part of some ore bodies are concordant with the host rocks, but most are discordant lenses and veins in the carbonate rocks. Thus there are two types of ores, primary sedimentary and later replacement. The replacement type is very common. Isotopic studies indicate that most of the Pb and S are of sedimentary origin, but part of Pb is of radioactive origin, possibly introduced during later replacement. A regional geochemical survey indicates that the Pb and Zn contents of the Fankou region are respectively 1.5 and 3 times the primary sedimentary type. Gas-liquid fluid inclusions were found in the replacement type ore but not in the primary sedimentary type. The fluid which replaced the primary sedimentary rocks had temperatures of 100–200°C, with a salinity of 3–6 wt. % NaCl equiv. Under the action of such fluid the original sedimentary rocks were replaced to form the present ore deposit. 相似文献
15.
B. M. Mikhailov 《Lithology and Mineral Resources》2001,36(1):1-12
Based on recent publications and our long-standing investigations, the most reasonable ways were proposed to obtain the manganiferous raw material for the Uralian metallurgic industry, which lost the traditional raw base (Ukrainian and Georgian deposits) after the USSR breakdown. The Urals is region is perspective for the discovery of two types of manganese deposits. (1) Insignificantly metamorphosed siliceous–carbonate ores with silica modulus MSi (i.e., MnO : SiO2) ranging from 1 to 2 and manganese content of 17–20%. The most promising are the areas with different-age, mainly carbonate rocks in the Urals (Northern and Polar) and Pai-Khoi regions. (2) Oxide, mainly pyrolusite–psylomelane ores with Mn content of 30–35% in the Meso–Cenozoic manganese hats developed in the Paleozoic manganiferous (volcanogenic–siliceous and carbonate–siliceous) rocks and noneconomic (small) deposits. The most promising areas are Late Cretaceous and Paleogene peneplains of the Southern Urals (Trans-Uralian and Zilair regions). It is necessary to intensify works on the improvement of concentration technique for manganese ores and to carry out the marketing study of the expediency of replacing imported manganiferous concentrates by those obtained from the Uralian ores. 相似文献
16.
广西大厂锡矿铟的地球化学特征及成因机制初探 总被引：13，自引：3，他引：10
广西大厂锡矿位于江南古陆西南缘,桂西北海西-印支期被动陆缘裂谷盆地北部的断裂凹陷盆地中,是中国重要的、以锡为主的有色金属矿床。它主要由长坡-铜坑和高峰矿床、拉么矿床、大福楼矿床和亢马矿床等组成,其铟资源量约6 000 t。文章在对长坡-铜坑矿床、高峰矿床以及拉么矿床不同类型围岩（包括花岗岩质岩石）、矿石以及不同矿床类型中矿石矿物（硫化物和氧化物）中的In、Cu、Cd、Sn、Fe、Zn等微量元素分析的基础上,结合不同类型矿床、不同矿物组合中硫化物的微量元素电子探针测试以及硫同位素分析结果,初步认为大厂锡矿岩浆源区是富铟的,在正常的沉积岩中不存在铟的初始富集;In主要赋存于闪锌矿中,与层状和块状的矿体关系密切。在成矿作用过程中,In的分布和富集对矿物组合和矿石类型具有明显的选择性。大厂铟矿的形成是富铟的岩浆源区重融产生含铟岩浆,在岩浆侵位冷却过程中,由岩浆结晶所产生的流体携带In、Cu、Fe、Zn、Sn等成矿元素从岩浆中出溶,形成含In的成矿流体。水-岩反应以及在大气降水来源流体的参与下,导致In、Cu、Fe、Zn、Sn等从成矿流体中沉淀、富集成矿。 相似文献
17.
M. V. Borisov M. M. Volkova D. A. Bychkov Ya. V. Bychkova 《Moscow University Geology Bulletin》2011,66(4):269-273
The sources of material that make up veins at hydrothermal deposits were estimated by distribution of REE in ores and host
rocks. Paleozoic granites (major ore-hosting rocks at most deposits) and Precambrian schists (ore-hosting rocks typical only
of the Dzhimidon deposit), which are the predominant rocks of the Sadon district, played an important role in the formation
of base-metal ores. 相似文献
18.
铁门闩碳酸锰矿受控于地层层位,呈层状,似层状、透镜状沿震旦系下统大塘坡组一段（Ｚ１ｄ）富含有机质炭质页岩下部顺层产出。根据含锰岩系特征,矿体形态规模,矿石质量的分析研究,该锰矿床应属浅海沉积型碳酸锰矿。 相似文献
19.
新疆克兰盆地红墩铅锌矿床与铁木尔特铅锌矿床的对比研究 总被引：8，自引：0，他引：8
虽然红墩铅锌矿床与铁木尔特铅锌矿床均产于新疆阿尔泰山南缘中部的克兰裂谷盆地,且二者的矿体产状与地层走向一致,具有明显的纹层状构造,但是在某些主要地质特征上,二者却存在显著的差异.例如,前者赋存于中泥盆统阿勒泰镇组的沉积碎屑岩,与海相基性火山岩有关,表现为锌多铅少,不含铜,且闪锌矿为含铁较少的低温闪锌矿;而后者却赋存于下泥盆统康布铁堡组的火山碎屑-碳酸盐岩中,与海相酸性火山岩有关,表现为铅多锌少,富含铜,且闪锌矿为含铁较多的高温闪锌矿.综合对比研究表明,红墩铅锌矿床属于SEDEX型铅锌矿床,而铁木尔特铅锌矿床则属于VHMS型铅锌矿床. 相似文献
20.
V. N. Kuleshov 《Lithology and Mineral Resources》2012,47(3):217-233
Study of carbonate inclusions in the Mamatwan-type oxide ores (braunite lutites) made it possible to reveal residual microbial
structures in them. Their presence in manganese ores, the type of manganese oxide mineralization, isotope signatures of manganese
carbonates, and available literature data on the geology of the Kalahari manganese field suggest that manganese ore formation
was widespread at the postsedimentary stage of transformation of the primary microbial sediment. The deposit can be referred
to the hydrothermal-metasomatic type. 相似文献