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1.
贵州松桃道坨锰矿含锰岩系地球化学特征
和沉积环境分析 总被引：18，自引：0，他引：18
道坨锰矿床是贵州锰矿整装勘查过程中新发现的全隐伏超大型锰矿床,其含锰岩系赋存于南华系大塘坡组第一段底部黑色页岩中,呈层状、似层状、透镜状产出。对含锰岩系主量及微量元素地球化学特征分析:其V/(V+Ni)、V/(V+Cr)、V/Cr、Ce/La值,及U、V、Ni、Mo等氧化还原敏感元素的富集程度显示其形成于缺氧环境。含锰岩系富集As、Mo、Ag、Sb,及Al/(Al+Fe+Mn)、(Fe+Mn)/Ti、Co/Zn值均显示热水沉积物特征,且在(Cu+Ni+Co)×10—Fe—Mn、Co/Zn—(Cu+Ni+Co)关系图解中,岩矿样品投影点均落在热水沉积区内,反映了热水作用对锰的富集和成矿影响甚重。此外,Al2O3/(Al2O3+Fe2O3)、Al/(Al+Fe)、Al/(A1+Fe+Mn)、(La/Ce)N值及(K2O+NaO2)—SiO2、La/Ce—Al2O3/(Al2O3+Fe2O3)图解指示含锰岩系形成于被动大陆边缘背景。 相似文献
2.
扬子陆块北缘的鄂东北地区是湖北省沉积变质型锰矿集中区,发育了广水—黄陂—蕲春SEE-NWW向元古代沉积变质锰矿带,锰矿赋存于新元古界红安岩群中。本文以鹰咀山锰矿床、四方山锰矿床及孙冲锰矿床为例,分析研究其矿物学特征和地球化学特征,以便为总结该区锰矿床成矿环境及成矿物质来源提供帮助。研究表明,锰矿石矿物主要为菱锰矿、软锰矿、硬锰矿、黑锰矿、锰铝榴石等;矿石化学组分多样,Co、Ni、Zn、Sr、Ba、U等元素相对富集。锰矿石的w(Th)/w(U)、w(V)/w(Cr)值反映锰矿形成于弱氧化-还原的沉积环境;w(SiO2)/w(Al2O3)、w(Fe+Mn)/w(Ti)、w(Fe)/w(Ti)、w(Al)/w(Fe+Mn+Al)、w(Y)/w(Ho)、w(La)/w(Ce)特征值,以及w(SiO2)—w(Al2O3)图解、w(Fe)/w(Ti)—w(Al)/w(Fe+Mn+Al)图解,均反映其成矿过程中有热水物质参与。因此,鄂东北地区的沉积变质型锰矿形成于弱氧化-还原性沉积环境,有热水(液)活动参与成矿作用并提供了丰富的物质来源。 相似文献
3.
李家湾锰矿床是黔东松桃地区较为典型的"大塘坡式"锰矿床之一,也是近年来在该地区新发现的一个大型隐伏锰矿床,是杨立掌锰矿体在外围的深部延伸。笔者在野外地质调查的基础上,重点对该矿床的锰矿石及其围岩开展系统的地质和地球化学特征研究,探讨锰矿床的成矿物质来源、成因和成矿环境。该矿床主要的矿石形态有块状、条带状、花斑状3种,主要锰矿物为菱锰矿和钙菱锰矿。锰矿层中MnO、CaO、MgO含量较高,TiO_2、Al_2O_3、K_2O、Na_2O含量较低,含锰岩系富集Rb、Ba、Th、Cs、Zr、Ga等元素;SiO_2/Al_2O_3值显示其物质来源并非正常的陆源,通过Al/(Al+Fe+Mn)、(Fe+Mn)/Ti、Fe/Ti、Y/Ho、Nb/Ta、U/Th值,Fe-Mn-(Cu+Co+Ni)×10图解表明,锰矿具有热水沉积特征;Mn/Fe、Sr/Ba、V/(V+Ni)值揭示锰矿沉积环境为浅海、还原环境。稀土元素总量较高,轻稀土富集,含锰岩系Eu、Ce的异常、La/Ce值、ΣREE和ΣHREE总量反映锰矿沉积过程受热水活动影响,大地构造环境处于被动大陆边缘。由此表明,李家湾锰矿形成于较强的还原环境,锰矿形成是由热水沉积和正常沉积的混合作用形成,属于热水沉积成因。 相似文献
4.
湖南响涛源锰矿位于湘中桃江成锰盆地。盆地内发育一组NNW向同沉积断裂,形成了一系列断陷槽,控制了沉积岩相的分布,其中黑色页岩、含锰灰岩、碳酸锰矿为成矿最佳的岩性组合。矿石的化学组分多样,Co、Ni、Pb、Mo和Ba等丰度较高,Co/Ni、SiO2/Al2O3、(Fe+Mn)/Ti、Al/(Fe+Mn+Al)、Fe/Ti比值以及Co/Zn-(Cu+Ni+Co)和Fe-Mn-(Cu+Ni+Co)图解揭示锰矿成矿过程中有海底热水的参与;稀土元素配分模式、Ce、Eu异常表示锰矿形成于被动大陆边缘环境,并具有热水沉积特征;碳同位素结果显示出富集碳的轻同位素的特征,反映了响涛源锰矿成矿过程中深部热水沉积及生物作用的特征;氧同位素计算古温度为湘中响涛源锰矿床的低温热水沉积成因提供了有利的佐证。 相似文献
5.
渝东南“大塘坡式”锰矿形成于Marinoan冰期和Sturtian冰期的间冰期,是在扬子地块东南缘“堑- 垒”式陆缘沉积盆地背景上发育的多阶段、多成因沉积型菱锰矿,成锰期明显受大地构造活动、岩浆作用(火山作用)、“黑烟窗”等热事件影响;且与Rodinia超大陆裂解导致的裂谷盆地成矿作用关系密切。冰期转换、裂谷盆地作用及锰成矿作用三者间的耦合关系明显,并呈现显著相关的沉积地球化学特征。对渝东南不同矿区、不同产状的锰矿及其围岩样品进行的相关Mn/Fe、(Fe+Mn)/Ti、Ba/Sr、U/Th、Y/Ho、SiO2/Al2O3、Al/(Al+Fe+Mn)比值分析和Co/Zn- (Co+Ni+Cu)、La/Yb- ΣREE、La/Yb- Ce/La、lgTh- lgU、La- Ce、lgTh- lgU、(Cu+Ni+Co)×10- Fe- Mn等图解分析,均指示成锰物质的深部来源,成矿受热水影响显著;此外,样品富集As、Sb、Sr、Mo、Ag、Ba、Th、U等热水沉积标识元素。锰矿样品稀土总量平均值为159×10-6,明显高于正常海相沉积阶段形成的菱锰矿稀土总量(19×10-6)。锰矿样品V/(V+Ni)、V/Cr、Ce/La、lgCe/Ce*指示锰矿形成于缺氧环境;Mo、U等氧化- 还原敏感元素富集。成锰盆地的氧化 还原条件制约着锰矿的形成,且成矿过程是沉积、成岩、后生不同阶段矿物相转化的综合结果。锰矿成矿可分为三阶段：第一阶段为沉积期分层性海水上部氧化带MnO2沉淀物富集;第二阶段为沉积期周期性短暂的富氧底流将MnO2沉淀物带入盆地底部沉积;第三阶段为准同生 成岩期,MnO2在缺氧环境中的厌氧细菌或硫酸盐细菌作用下还原为Mn2+,同时产生OH-使底层海水或海底沉积物孔隙流体碱度升高,形成原生菱锰矿及(含)锰碳酸盐沉积物,经成岩作用进一步形成菱锰矿。 相似文献
6.
湘中湘潭盆地大塘坡组锰矿是湖南重要的锰矿基地。盆地内发育一组NNE向同沉积断裂,形成了一系列凹陷带（断陷槽）,控制了沉积岩相的分布,锰矿主要产于盆地凹陷带的黑色页岩夹碳酸锰矿微相内。矿石中Co、Zn、Pb、Mo和Ba等元素丰度较高,Co/Ni、SiO2/Al2O3、(Fe+Mn)/Ti、Al/(Fe+Mn+Al)比值以及Co/Zn-(Cu+Ni+Co)和Fe-Mn-(Cu+Ni+Co)图解都揭示锰矿成矿过程中有海底热水的参与;稀土元素分布模式、Ce、Eu异常表示锰矿形成于被动大陆边缘环境,并具有热水沉积特征;碳同位素结果显示出富集碳的轻同位素的特征,反映了湘中地区锰矿中碳同位素热水沉积的特征;氧同位素计算古温度为湘中地区锰矿的低温热水沉积成因提供了有利的佐证。 相似文献
7.
贵州松桃西溪堡锰矿沉积地球化学特征 总被引：4，自引：0，他引：4
贵州黔东断裂坳陷带是贵州重要的锰矿成矿带,并发育新元古代大塘坡期的一套完整“黑色岩系”,锰矿主要赋存于该黑色岩系中。本文以松桃西溪堡锰矿床为例,通过岩石学、矿物学、地球化学等研究方法,探讨这类锰矿床的成矿物质来源及成因。研究表明矿石中的矿物组分复杂,结构构造类型多样,富集As、Sb、Ag、Co、Mo、W、Cs和Ba等元素,Fe／Ti、（Fe＋Mn）／Ti、A1／（AI＋Fe＋Mn）、Y／Ho、Nb／Ta比值,以及Cr．zr和Th．u图解均揭示成矿过程中有热水物质参与;V／（V＋Ni）、V／Cr比值表明锰矿形成于缺氧环境;稀土元素分布模式、Ce、Eu异常及La．Ce、La／Yb．EREE图解显示锰矿形成于被动大陆边缘环境,并具有热水沉积特征。因此,古被动大陆边缘是锰矿富集的理想场所,热水（液）活动为其提供了丰富的物质来源。这为锰矿的找矿拓展了新的思路。 相似文献
8.
晚泥盆世五指山组是桂西南地区重要的含锰地层,为一套硅质-泥质-灰质及其过渡相组成的深水台沟相沉积。锰矿体的形态和展布受岩相组合和构造条件的控制。本文分析了含锰岩系的主量及微量元素地球化学:含锰岩系的V/(V+Ni)、V/Cr、U/Th、Ni/Co值,U、V和Mo等氧化还原敏感元素的富集程度显示研究区含锰岩系形成于弱氧化-富氧环境。另外,含锰岩系的Fe/Ti、Al/(Al+Fe+Mn)、Si O2/Al2O3、Ba/Sr及Co/Zn比值及稀土元素Eu正异常特征均显示热水沉积物的特征,在Si O2-Al2O3、Fe/Ti-Al/(Al+Fe+Mn)、log U-log Th、(Ni+Cu+Co)×10-Fe-Mn关系图解中,样品投影点均落在热水沉积区内,反映锰的富集和成矿过程与热水活动的参与密切相关。含锰岩系的La/CeAl2O3/(Al2O3+Fe2O3)、100×(Fe2O3/Si O2)-100×(Al2O3/Si O2)、Fe2O3/(100-Si O2)-Al2O3/(100-Si O2)、Fe2O3/Ti O2-Al2O3/(Al2O3+Fe2O3)图解及稀土元素特征,均指示含锰岩系形成于被动大陆边缘背景。 相似文献
9.
本文根据矿石特征和岩石地球化学特征分析了重庆秀山小茶园一带锰矿床含锰岩系的物质来源、沉积环境和成因。该含锰岩系赋存于南华系大塘坡组一段。元素地球化学特征表明,主成矿元素Mn与Al_2O_3、SiO_2呈明显负相关,与MgO、CaO呈明显正相关,Ag、As、Sb平均含量明显偏高,显示研究区含锰岩系为热水沉积成因;Co/Zn-(Co+Ni+Cu)图解、(Co+Ni+Mn)×10-Fe-Mn图解和Y×P_2O_5图解均显示该含锰岩系具有热水沉积的特征;HREE亏损,LREE富集,且Eu负异常的特征,以及δCe值,暗示该区锰矿形成于被动大陆边缘区;V/Cr和V/(V+Ni)值指示含锰岩系形成于厌氧和缺氧环境。 相似文献
10.
陕西宁强县中坝锰矿床形成于扬子地块西北缘伸展裂陷沉积环境内,是近年新发现的锰矿床,赋存于下寒武统牛蹄塘组黑色岩系内,含锰岩系岩性主要为含碳粉砂质板岩、含碳泥质板岩、硅质岩,夹有灰岩条带和灰岩透镜体,矿石类型为层状、似层状的含锰硅质岩及条纹条带状的含锰灰岩,含锰矿物主要为硬锰矿,可见极少量的菱锰矿。对中坝一带MnⅠ号锰矿体常量及微量元素地球化学特征分析表明：中坝锰矿体相对围岩亏损Ti和Al元素,SiO2/Al2O3比值较高,Th含量低,Y/Ho比值高,且含锰岩系的PAAS标准化的稀土元素配分模式具有轻稀土元素亏损、重稀土元素富集、Ce负异常、Y正异常的特征,与现代海水稀土元素配分模式一致,说明海水自生沉积作用对含锰岩系中元素的富集具有重要影响,陆源碎屑物质的影响较小;含锰岩系的Al/（Al+Fe+Mn）、Fe/Ti、（Fe+Mn）/Ti、U/Th、Sr/Ba比值、δEu及SiO2-Al2O3图解、Fe/Ti-Al/（Al+Fe+Mn）图解、Lg （U）-Lg （Th）图解、Fe-Mn-（Cu+Co+Ni）×10图解、La/Yb-REE图解、δEu-Mn图解均表明锰矿沉积为热水沉积和正常海水混合作用的结果。含锰岩系的δCe、V/Cr、V/（V+Cr）、Ni/Co比值、富集U、V、Mo等特征表明锰矿形成于还原-硫化的沉积环境。中坝锰矿的形成机制为在弱碱性、还原、富CO32-的条件下,Mn2+和CO32-结合形成菱锰矿而沉淀。由此总结出中坝锰矿的成矿模式为：在早古生代,富含Fe、Mn多金属的硅质热水溶液沿着刘家坪古火山通道上涌,上涌的热水与海水混合,在弱碱性、还原、富CO32-的条件下,Mn2+和CO32-结合形成菱锰矿而沉淀,形成Fe、Mn硅质岩,且在沉积凹陷处成矿更有利,溶于海水中的Mn同碳酸盐一同沉淀,形成含锰灰岩。 相似文献
11.
12.
Summary ?The rare earth, major and trace element geochemistry of Jurassic deep marine manganese shales allow insight into their environment
of deposition. We present data of 24 samples from the Northern Calcareous Alps (Eastern Alps), collected from Late Jurassic
strata of the Tennengebirge and from Early Jurassic strata of the Karwendel Mts. Whereas major and trace element geochemistry
is controlled by the detrital input, rare earth element data and the relationship between total organic carbon and (pyritic)
sulfur can be used to constrain the origin of the manganese accumulation. The data of this study are compatible with a hydrogenous
precipitation of manganese by strongly varying redox-conditions at the sediment–water interface of a slope basin.
Received December 21, 2001; revised version accepted February 18, 2002 相似文献
13.
Mineralogy and major-trace element geochemistry of the Haymana manganese mineralizations,Ankara, Turkey 总被引：2，自引：0，他引：2
The study area comprises Çayirli, Harapa?illari and Ortabel (ÇHO) districts in the Haymana town 25 km SW of the Ankara city. In this study, geologic setting, mineralogical and geochemical characteristics of manganese mineralizations are examined and their origin is discussed. Data were obtained from field observations, various polished and thin section determinations and chemical analyses of 25 ore samples. Major and trace element analyses were conducted with ICP-ES and ICP-MS methods at ACME Laboratories (Canada). ÇHO manganese ores are found in reddish radiolarites and partly interbedded marls of the Ankara ophiolitic melange of lower Cretaceous-upper Senonian age. In these extremely folded rocks, manganese is observed as band and lenses. All samples are composed of pyrolusite and quartz. Circular pyrolusites around the gangue form a ring texture and radiolarite ores yield spherical sections. In addition, breccia-like texture is observed between pyrolusite and quartz. Geologic setting, mineralogical and textural data indicate an exogene environment. Major and trace element abundances and correlation among them imply that ÇHO mineralizations are of hydrothermal origin and linked to the same source. Evaluation of all these data shows that ÇHO manganese mineralizations are of hydrothermal type sedimentary mineralization and they were deposited in distal part of the source. 相似文献
14.
Koichiro Fujinaga Tatsuo Nozaki Takazumi Nishiuchi Kiyoko Kuwahara Asuhiro Kato 《Resource Geology》2006,56(4):399-414
Abstract. Major and trace element contents are reported for Permian manganese ore and associated greenstone from the Ananai manganese deposit in the Northern Chichibu Belt, central Shikoku, Japan. The manganese deposit occurs between greenstone and red chert, or among red chert beds. Chemical compositions of manganese ore are characterized by enrichments in Mn, Ca, P, Co, Ni, Zn, Sr and Ba, and negative Ce and positive Eu anomalies relative to post-Archean average Australian Shale (PAAS). Geochemical features of the manganese ore are similar to those of modern submarine hydrother-mal manganese deposits from volcanic arc or hotspot setting. In addition, geochemical characteristics of the greenstone closely associated with the Ananai manganese deposit are analogous to those of with-in plate alkaline basalt (WPA). Consequently, the Ananai manganese deposit was most likely formed by hydrothermal activity related to hotspot volcanism in the Panthalassa Ocean during the Middle Permian. This is the first report documenting the terrestrially-exposed manganese deposit that was a submarine precipitate at hotspot. 相似文献
15.
The importance of trace metal scavenging by organic matter in geochemical samples was estimated using an alkaline sodium hypochlorite extraction to leach copper, zinc, molybdenum, iron and manganese from a variety of soils, and stream and lake sediments collected on the Nechako plateau, central British Columbia. The reagent oxidizes or dissolves most forms of organic matter, together with any sulphide minerals, to give strongly coloured extracts containing the associated trace elements at a pH where solution of other sample fractions is at a minimum. Metals precipitated due to alkaline conditions are redissolved by a succeeding distilled-water leach (pH 3.0 ± 0.3).A large fraction of the copper, zinc, molybdenum, and manganese held within the organic fraction of the A soil horizon is liberated whereas only minor amounts of copper, zinc, and manganese are released from inorganic soil (B and C) horizons. Molybdenum, however, is relatively soluble in all soils as the molybdate ion. Despite similar concentrations of organic matter in A horizon soils and stream sediments the latter release a lower proportion of their trace element content. Behaviour of the organic fraction of lake sediments varies from lake to lake and there is great variability in the association of copper, zinc, molybdenum and manganese with organic matter even within the same lake.The presence of organic matter in samples subjected to other partial extractions can be a deleterious factor if the organic fraction is not first removed by a hypochlorite extraction. 相似文献
16.
鹤庆锰矿小天井矿区微量元素特征与沉积成矿环境研究 总被引：1，自引：0，他引：1
小天井矿区是鹤庆锰矿储量最大开采最早的矿区,通过对该矿区含锰岩系的60个样品进行微量及稀土元素测试,运用相关分析、因子分析等多元统计方法分析和探讨微量及稀土元素的地球化学特征与锰矿的沉积环境关系,确定Mo、U、V、Mn、Zn为该矿区重要成矿元素组合,这对本区地球化学找矿中判别地层与构造的含矿性、推断隐伏矿体寻找接替资源具有重要意义。对Co/Ni、Sr/Ba、Th/U的分析,认为锰矿层物源主要是陆源,推测沉积环境为陆缘近海环境,并对该区锰的沉积成矿环境进行了进一步探讨。 相似文献
17.
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
18.
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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I. Ugulu Y. Dogan S. Baslar O. Varol 《International Journal of Environmental Science and Technology》2012,9(3):527-534
The purpose of this study is to determine the present levels of atmospheric trace element pollution in the Murat Mountain of Aegean Region in the western part of Turkey. Therefore, 29 different plants were selected as potential biomonitors of trace elements including nickel, zinc, iron, lead, cadmium and manganese (??g/g, dry weight). The samples were collected from two different heights of Murat Mountain. Atomic absorption spectrometry was used to determine the concentrations of trace elements. The mean concentrations determined at 1,000?m altitude ranged from 0.139 to 4.518, 0.223 to 0.986, 0.359 to 6.930, 0.443 to 0.727 and 0.077 to 3.222???g/g, dry weight, for nickel, zinc, iron, lead and manganese, respectively. At 1,600?m altitude, the values ranged from 0.191 to 6.248, 0.302 to 1.008, 2.387 to 8.896, 0.345 to 0.570 and 0.195 to 3.502???g/g, dry weight, for nickel, zinc, iron, lead and manganese, respectively. No cadmium was found at both altitudes. For determination of existence of any differences between the averages of the herbaceous and woody plants, comparisons were made by the independent sample t test. In the statistical analysis, comparison of trace element pollution values of herbaceous and woody plants for nickel, lead and manganese was significant (P?<?0.05), while it was not for iron and zinc. 相似文献