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云南省开远地区位于南盘江克拉通盆地内,是滇东南地区传统的优质富锰矿产区。通过对云南省开远地区沉积型锰矿地质特征以及区内典型锰矿床研究,结合研究区遥感矿化蚀变信息特征、水系沉积物地球化学特征,系统总结了区内含锰岩系法郎组的成矿特征及找矿标志,在研究区内圈出了两个锰矿找矿远景区,通过地表山地工程验证,取得了较好的找矿成果,为在区内寻找锰矿指明了方向。 相似文献
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冶金地质部门为了保障冶金工业的可持续发展，制订出“优质锰矿”质量标准，把优质锰作为主要勘查对象，对扬子地台周边优质锰矿成矿规律开展研究，并对优质锰矿资源前景进行了科学评价，取得了突破性进展。优质锰矿科研与勘查的密切结合，尤其在新一轮国土资源大调查中，取得重大进展。文章还对我国优质锰矿科研及勘查工作提出了若干建议。 相似文献
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区内氧化锰矿皆赋存于含锰层系中,呈似层状或透镜状产出,且与围岩略具同步褶曲,表明锰矿系-古风化型锰矿经后期的进一步氧化、富集所形成的.这一认识对指导区域找矿取得了较好的效果. 相似文献
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贵州从江-黎平地区锰矿产于南华系大塘坡组第一段黑色岩系中。通过对从江-黎平地区开展地质调查工作,查明该区含锰岩系分布于朝里向斜及寨柳向斜,区内两个已知矿床八当锰矿和高增锰矿即位于朝里向斜。文章系统阐述了从江-黎平地区锰矿成矿地质背景、含锰岩系特征、锰矿床地质特征,对该区南华纪大塘坡期锰矿成因进行了探讨研究,并总结了区内锰矿成矿规律,在此基础上,结合野外地质调查成果,对该区锰矿找矿潜力进行了分析,认为朝里向斜南部具一定找矿潜力。 相似文献
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云南开远地区中三叠统法郎组是区内唯一的含锰地层,含锰层主要位于法郎组一段和二段粉砂质泥岩内,主体呈北东走向,与地层产状一致,局部受构造运动影响发生变化,锰矿地质特征可与斗南锰矿进行对比。通过对区内法郎组地层、岩相古地理及锰矿成矿地质特征进行研究,初步总结了锰矿成因,认为区内锰矿受地层、构造、古地理环境及锰质来源等控制。锰质主要来源于海盆周围的古陆及火山活动,构造控制古地理环境,环境控制锰矿的形成与分布。 相似文献
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我国优质锰矿的勘查方向 总被引：16，自引：3，他引：16
优化锰矿是国家战略资源和紧缺矿种，也是近期地质勘查的主要目标矿种之一。锰矿地质勘查进展和勘查评价技术以及锰矿选冶技术的进步拓展了优质锰矿的勘查工作领域。我国优质锰矿仍有较大的资源潜力。从优质锰矿成矿地质背景，成锰条件，地质工作程度和找矿潜力分析，提出5个重要的找矿远景区作为近期优质锰矿的勘查方向。 相似文献
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我国现有锰矿资源状况，不能满足钢铁工业发展的需要。寻找低磷低铁低硅富锰矿，是解决锰矿资源短缺的重要途径。城口锰矿具有较大的找矿前景，锰矿层产出稳定，锰含量高，铁含量低，烧失量大。加强城口矿区勘查，扩大矿床规模，可望成为我国锰矿的重要生产基地。 相似文献
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Jiafei Xiao Jingyang He Haiying Yang Chengquan Wu Jianbin Xu Yantao Li 《Resource Geology》2019,69(3):227-248
The Datangpo‐type manganese ore deposits, which formed during the Nanhuan (Cryogenian) period and are located in northeastern Guizhou and adjacent areas, are one of the most important manganese resources in China, showing good prospecting potential. Many middle‐to‐large deposits, and even super‐large mineral deposits, have been discovered. However, the genesis of manganese ore deposits is still controversial and remains a long‐standing source of debate; there are several viewpoints including biogenesis, hydrothermal sedimentation, gravity flows, cold‐spring carbonates, etc. Geochemical data from several manganese ore deposits show that there are positive correlations between Al2O3 and TiO2, SiO2, K2O, and Na2O, and strong negative correlations between Al2O3 and CaO, MgO, and MnO in black shales and manganese ores. U, Mo, and V show distinct enrichment in black shales and inconspicuous enrichment in Mn ores. Ba and Rb show strong positive correlations with K2O in manganese ores. Cu, Ni, and Zn show clear correlations with total iron in both manganese ores and black shales. ∑REE of manganese ores has a large range with evident positive Ce anomalies and positive Eu anomalies. The Post Archean Australian Shale (PAAS) normalized rare earth element (REE) distribution patterns of manganese ores present pronounced middle rare earth element (MREE) enrichment, producing “hat‐shaped” REE plots. ∑REE of black shales is more variable compared with PAAS, and the PAAS‐normalized REE distribution patterns appear as “flat‐shaped” REE plots, lacking evident anomaly characteristics. δ13C values of carbonate in both manganese ores and the black shales show observable negative excursions. The comprehensive analysis suggests that the black shales formed in a reducing and quiet water column, while the manganese ores formed in oxic muddy seawater, which resulted from periodic transgressions. There was an oxidation–reduction cycle of manganese between the top water body and the bottom water body caused by the transgressions during the early Datangpo, which resulted in the dissolution of manganese. Through the exchange of the euphotic zone water and the bottom water, and episodic inflow of oxygenated water, the manganese in the bottom water was oxidized to Mn‐oxyhydroxides and rapidly buried along with algae. In the early diagenetic stage, Mn‐oxyhydroxides were reduced and dissolved in the anoxic pore water and then transformed into Mn‐carbonates by reacting with HCO3? from the degradation of organic matter or from seawater. In the intervals between transgressions, continuous supplies of terrigenous clastics and the high productive rates of organic matter in the euphotic zone resulted in the deposition of the black shales enriched in organic matter. 相似文献
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Takeru Moriyama Mruganka K. Panigrahi Dinesh Pandit Yasushi Watanabe 《Resource Geology》2008,58(4):402-413
The major, trace and rare earth element (REE) composition of Late Archean manganese, ferromanganese and iron ores from the Iron Ore Group (IOG) in Orissa, east India, was examined. Manganese deposits, occurring above the iron formations of the IOG, display massive, rhythmically laminated or botryoidal textures. The ores are composed primarily of iron and manganese, and are low in other major and trace elements such as SiO2, Al2O3, P2O5 and Zr. The total REE concentration is as high as 975 ppm in manganese ores, whereas concentrations as high as 345 ppm and 211 ppm are found in ferromanganese and iron ores, respectively. Heavy REE (HREE) enrichments, negative Ce anomalies and positive Eu anomalies were observed in post‐Archean average shale (PAAS)‐normalized REE patterns of the IOG manganese and ferromanganese ores. The stratiform or stratabound shapes of ore bodies within the shale horizon, and REE geochemistry, suggest that the manganese and ferromanganese ores of the IOG were formed by iron and/or manganese precipitation from a submarine, hydrothermal solution under oxic conditions that occurred as a result of mixing with oxic seawater. While HREE concentrations in the Late Archean manganese and ferromanganese ores in the IOG are slightly less than those of the Phanerozoic ferromanganese ores in Japan, HREE resources in the IOG manganese deposits appear to be two orders of magnitude higher because of the large size of the deposits. Although a reliable, economic concentration technique for HREE from manganese and ferromanganese ores has not yet been developed, those ores could be an important future source of HREE. 相似文献
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M. Ajmal 《Mineralium Deposita》1990,25(2):160-162
An attempt has been made to study the distribution pattern and concentration trends of eight significant metallic trace elements in the manganese ores of a few opencast workings of Barbil, Keonjhar district, Orissa, India. Cu, Pb, Zn, Co, Ni, Sr, Mo, and V are the trace elements that were chemically determined from 60 samples of manganese ores collected from the study area. Since the mean concentrations of most of the trace elements concerned in the Barbil manganese ores are generally lower than those found in the manganese ores known to be volcanogenic origin, the manganese was probably derived from some nonvolcanogenic terrestrial rock source. 相似文献
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为分析贵州遵义二叠纪锰矿的沉积环境,对谢家坝锰矿床进行常量元素、微量和稀土元素地球化学研究。研究认为：谢家坝锰矿赋存于茅口组顶部含锰岩系中,可分为下矿层豆状、角砾状菱锰矿、似层状菱锰矿,以及上矿层碎屑状、块状菱锰矿的二元结构矿石类型组合,可广泛代表遵义锰矿的矿石特征。谢家坝锰矿上下矿层之间主量元素和稀土元素含量差异较大,常量元素SiO2、TiO2、S、Fe2O3含量上矿层均大于下矿层,MnO、MgO与 Al2O3之间均呈负相关关系;上矿层Fe/Mn值较高,属高Fe低P型锰矿,而下矿层Fe/Mn值较低,属中低Fe低P型锰矿。上矿层稀土元素PAAS标准化配分后呈现较明显的重稀土亏损、弱的轻稀土富集、右倾配分的特征,具有弱的Ce正异常,类似海底铁锰结核稀土元素特征;下矿层呈现弱的中稀土富集,轻、重稀土亏损,弱的帽式分配特征,具明显的Ce负异常,类似典型深部海水沉积稀土元素特征。微量元素Th/U、Ni/Co、V/Cr、V/（V+Ni）、AU等沉积环境古氧相分析指标和稀土元素PAAS标准化配分模式指示,谢家坝锰矿下矿层是在贫氧-厌氧条件下Mn2+与CO32-直接形成菱锰矿,上矿层在常氧-贫氧环境下Mn3+、Mn4+以氧化物或氢氧化物形式沉淀。 相似文献
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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
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四川黑水-平武地区位于扬子地块北西缘之可可西里-松潘前陆盆地之松潘边缘海成锰盆地,系四川省重要铁锰成矿带之一。研究区内的三叠系菠茨沟组中已发现了一批大、中型锰矿床。研究区菠茨沟组具有碎屑岩型与碳酸盐型两种沉积类型,锰矿层均产在钙质岩石与碎屑岩交替变化部位。研究表明,陆棚浅海及水下洼地为锰矿沉积的有利环境,极薄层状钙质岩石与碎屑岩沉积相的频繁演替是野外重要的找矿标志。黑水县下口地区和平武县虎牙地区为研究区最有利的锰矿找矿预测靶区。 相似文献
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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