钴的迁移形式成矿机理初探   总被引：1，自引：0，他引：1  

郑大中  郑若锋 《四川地质学报》2010,30(3):364-368

通过对钴有关化合物的形成条件和理化性质,钴矿床矿物流体包裹体的化学成分、代表性钴矿物的化学成分、共、伴生矿物组合的探究,结合钴成矿地质背景和环境研究认为,钴的氢化物、合金氢化物、羰基化合物、羰基氢化物是内生钴的主要迁移形式。它们形成于地球深部高压、高温、富氢、富CO的强还原环境,通过断裂、裂隙随岩浆、热液迁移至地壳浅部,由于压力、温度骤降,氧逸度渐增、H2和CO逃逸、氧化,上述钴的化合物分解、氧化、硫化、砷化,沉淀富集形成内生钴矿床,并在以后地质事件中进一步叠加富集,形成更富更大的钴矿床。  相似文献   

吉林老岭大横路式热水沉积叠加改造型钴矿床     

杨言辰  冯本智  刘鹏鹗 《吉林大学学报(地球科学版)》2001,31(1):40-45

大横路式钴矿床位于辽吉元古宙裂谷带中部的老岭金、多金属成矿带中 ,是国内近年来发现和查明的新类型钴矿床。该类矿床产于古元古代老岭群富硼、碳千枚岩夹石英岩 (硅质岩 )建造之中 ;矿体由含碳绢云千枚岩、含电气石绢云千枚岩、石英岩、电英岩组成 ,呈层状、鞍状产出 ,产状与围岩一致 ;矿石中钴呈独立矿物硫钴镍矿、辉钴矿、方钴矿和含钴黄铁矿等产出。通过对矿床层控特征、矿体产状与矿石组合、矿石沉积组构、容矿岩石地球化学、热水沉积岩、稀土元素及同位素组成等几方面的研究 ,证明该矿床具有明显的海底热水沉积成因特征 ,矿床受后期热液改造叠加强烈。从而提出大横路式钴矿床为海底热水沉积 -热液叠加改造型矿床  相似文献   

新疆新源县铁梅粒克至巴依图马一带找矿前景再认识     

陈元正 《新疆地质》1994,(2)

铁梅粒克至巴依图马一带位于阿吾拉勒山脉火山岩带中西段，是规模巨大的中晚石炭世海相火山机构。该火山机构主要由火山杂岩（多偏碱性）、浅成－超浅成小侵入岩体、火山构造和成矿产物组合构成。其中有多种成矿显示，主要是金、铜、硫、铁、银等；各类地质异常、物探异常、化探异常、遥感影象特征异常、地下水特征异常等为重要的找矿标志；成矿类型比较复杂，构成以矽卡岩型、斑岩型、浅成热液型（含热泉型）为主的成矿组合；找矿前景特佳，可能找到规模巨大的斑岩型铜、金等多金属矿床、浅成热液型硫、钻矿床和金、铜等多金属矿床。  相似文献   

化探样品中微量铅、锡、铬、钼和钴的发射光谱法同时测定     

张明恭  陈梅一  苏勇 《矿物岩石》1993,(1)

本文以CdCl_2·2.5H_2O为反应剂,采用“下垫上滴”缓冲刺的装样形式,通过大量镉盐的蒸发控制电极温度,使被测元素预先分馏,有效地改善了它们的蒸发行为,同时,减小了基体效应、光谱背景。本法其有良好的精密度和准确度,各元素的检出限(×10~(-5))分别为:Pb(1),Sn(0.37),Cr(1.8),Ni(3.51,Mo(0.1)和Co(0.38),其相对标准偏差(RSD)为±3.7—9.5%  相似文献   

Genesis of sediment-hosted stratiform copper–cobalt deposits, central African Copperbelt   总被引：3，自引：0，他引：3  

J.L.H. Cailteux  A.B. Kampunzu  C. Lerouge  A.K. Kaputo  J.P. Milesi 《Journal of African Earth Sciences》2005,42(1-5):134

The Neoproterozoic central African Copperbelt is one of the greatest sediment-hosted stratiform Cu–Co provinces in the world, totalling 140 Mt copper and 6 Mt cobalt and including several world-class deposits (10 Mt copper). The origin of Cu–Co mineralisation in this province remains speculative, with the debate centred around syngenetic–diagenetic and hydrothermal-diagenetic hypotheses.The regional distribution of metals indicates that most of the cobalt-rich copper deposits are hosted in dolomites and dolomitic shales forming allochthonous units exposed in Congo and known as Congolese facies of the Katangan sedimentary succession (average Co:Cu = 1:13). The highest Co:Cu ratio (up to 3:1) occurs in ore deposits located along the southern structural block of the Lufilian Arc. The predominantly siliciclastic Zambian facies, exposed in Zambia and in SE Congo, forms para-autochthonous sedimentary units hosting ore deposits characterized by lower a Co:Cu ratio (average 1:57). Transitional lithofacies in Zambia (e.g. Baluba, Mindola) and in Congo (e.g. Lubembe) indicate a gradual transition in the Katangan basin during the deposition of laterally correlative clastic and carbonate sedimentary rocks exposed in Zambia and in Congo, and are marked by Co:Cu ratios in the range 1:15.The main Cu–Co orebodies occur at the base of the Mines/Musoshi Subgroup, which is characterized by evaporitic intertidal–supratidal sedimentary rocks. All additional lenticular orebodies known in the upper part of the Mines/Musoshi Subgroup are hosted in similar sedimentary rocks, suggesting highly favourable conditions for the ore genesis in particular sedimentary environments. Pre-lithification sedimentary structures affecting disseminated sulphides indicate that metals were deposited before compaction and consolidation of the host sediment.The ore parageneses indicate several generations of sulphides marking syngenetic, early diagenetic and late diagenetic processes. Sulphur isotopic data on sulphides suggest the derivation of sulphur essentially from the bacterial reduction of seawater sulphates. The mineralizing brines were generated from sea water in sabkhas or hypersaline lagoons during the deposition of the host rocks. Changes of Eh–pH and salinity probably were critical for concentrating copper–cobalt and nickel mineralisation. Compressional tectonic and related metamorphic processes and supergene enrichment have played variable roles in the remobilisation and upgrading of the primary mineralisation.There is no evidence to support models assuming that metals originated from: (1) Katangan igneous rocks and related hydrothermal processes or; (2) leaching of red beds underlying the orebodies. The metal sources are pre-Katangan continental rocks, especially the Palaeoproterozoic low-grade porphyry copper deposits known in the Bangweulu block and subsidiary Cu–Co–Ni deposits/occurrences in the Archaean rocks of the Zimbabwe craton. These two sources contain low grade ore deposits portraying the peculiar metal association (Cu, Co, Ni, U, Cr, Au, Ag, PGE) recorded in the Katangan sediment-hosted ore deposits. Metals were transported into the basin dissolved in water.The stratiform deposits of Congo and Zambia display features indicating that syngenetic and early diagenetic processes controlled the formation of the Neoproterozoic Copperbelt of central Africa.  相似文献   

渗水地膜节水增产效益试验   总被引：2，自引：0，他引：2  

季枫  张明  张玲  李富先 《沙漠与绿洲气象(新疆气象)》2002,25(2):21-23

渗水地膜具有调温、增温、加快发育进程，提高土吉湿度，增加单铃重，改善品质的作用。可提高棉花产量8．4％，具有广泛的推广应用前景。  相似文献   

铜钴矿样品X荧光快速测定技术的初步研究     

林延畅  葛良全  姜海静  赖万昌  张庆贤  曾兵  程锋  王广西 《物探化探计算技术》2007,29(3):256-259

使用基于Si-PIN探测器和嵌入式计算机的便携式高能量分辨率X荧光(XRF)分析仪,对采自刚果(金)的铜钴矿样品进行测量。通过对实测数据的处理与分析,分含量段建立目标元素的工作曲线,同时求出相应的基体效应校正模型,并编制到仪器内置X荧光分析应用软件中。实现仪器根据实测多道微分谱线中相关元素的特征X射线计数率,自动切换工作曲线与基体效应修正模型,快速输出Cu和Co的含量的测定结果。通过与化学分析结果比较,快速测定结果精确度较高。  相似文献   

兰坪盆地水泄铜(钴)矿床石英的⁴⁰Ar-³⁹Ar快中子活化年龄   总被引：2，自引：2，他引：0  

黄震  徐晓春  谢巧勤  陈天虎  岳书仓 《地质科学》2005,40(1):125-128

选取水泄铜(钴)矿床主成矿阶段的石英样品进行⁴⁰Ar-³⁹快中子活化法同位素地质年龄测定,获得坪年龄59.2±0.8Ma,对应的等时年龄为59.8±0.5Ma,反等时线年龄为59.9±0.1Ma,三者在误差范围内完全一致,都可代表矿石的形成年龄。该年龄与兰坪盆地铜多金属矿集区的矿床形成时代一致,反映包括水泄铜(钴)矿床在内的区域矿床形成于喜马拉雅造山运动早期统一的构造地质背景之下,受同一期构造—热演化事件的制约。  相似文献   

驼路沟喷气沉积型钴(金)矿床的地质-地球化学   总被引：19，自引：3，他引：16  

张德全  王彦  丰成友  李大新  阎升好  崔艳合 《矿床地质》2002,21(3):213-222

驼路沟矿床是容矿于震旦－寒武纪富钠火山－沉积岩系中的钴（金）矿床。矿床地质－地球化学特征,矿体的产态,矿石结构构造以及金属矿物的标型表明,驼路沟钴（金）矿床主要与震旦－－寒武纪海底喷气沉积成矿作用有关,在加里东和晚华力西－印支碰撞造山过程中,喷气沉积型矿体被构造改造,并导致金在局部地段进一步富集。元素地球化学研究揭示,Au,As,Pb,Cu,Zn,Mo,Co是圈定含矿层的化探异常元素组合,而Co-Ni-Au-Pb-Mo-As组合异常可以指示矿体。建议在矿床勘查的初期注意可能出现于喷气沉积成矿中心附近的铜钴矿。  相似文献   

Cobalt Deposits in the Central China Orogenic Belt   总被引：2，自引：0，他引：2  

XU Yong Bureau of Geology  Exploration  B Fuxing Rd. Beijing  and ZHU Xinyou Beijing Institute of Geology for Mineral Resources  Anwai Beiyuan  Beijing 《《地质学报》英文版》2000,74(3):540-543

Cobalt mostly occurs as an associated metal in Cu-Ni sulphide deposits, skarn Fe-Cu-Pb-Zn deposits and volcanic-hosted massive sulphide (VHMS) or sedex deposits. There are different types of cobalt deposits in the Central China orogenic belt. In the Tamu-Kalangu Mississippi-valley type Pb-Zn deposits, many cobalt-nickel sulphide minerals were found. The cobalt content of the ore is 0.064%-0.46% in sedex-type Kendekeke Fe-Pb-Zn-Au deposits, and cobalt sulphide veins with Co contents of 4%-9% have also been found. About 28000 tons of cobalt reserves were delineated in the Dur'ngoi Cu-Co-Zn deposit of VHMS type in the A'nyemaqen Mountains. It is considered that the exploration potential for cobalt is attractive in this district, especially in sedex-type deposits and Co-rich sulphide veins in sedex-type Fe, Cu and Pb-Zn deposits and their surroundings.  相似文献