共查询到19条相似文献，搜索用时 234 毫秒
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红旗岭镍矿田是我国岩浆岩型铜镍硫化矿床的主要矿化集中区之一,茶尖矿区是其重要组成部分之一.在茶尖矿区已往勘查中共发现20余个镁铁-超镁铁质岩体,并在1号、新6号、9号、18号岩体中发现小型铜镍矿床,2号、10号、14号等岩体中发现铜镍矿化.从岩体岩石学及蚀变矿化特征、岩体常量元素、微量元素、稀土元素特征方面进行分析,并与红旗岭镍矿区进行对比,认为其与红旗岭区镁铁-超镁铁岩具同源性,矿床属熔离-贯入型成因,后期热液叠加又是茶尖区独有的成矿特征,通过分析、对比,确定了该区找矿意义和前景区. 相似文献
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吉林红旗岭铜镍矿床综合找矿模型 总被引：3，自引：0，他引：3
董耀松 《吉林大学学报(地球科学版)》2003,33(2):152-155,177
以矿区地质背景、含矿岩体地质特征为基础，分析了吉林红旗岭钢镍矿床的成矿过程。提出含矿岩体是受构造控制的海西期镁铁—超模铁质岩体，岩体具有轻稀土富集、重稀土亏损的特征的地球化学信息和低阻、高磁、高重力的地球物理异常等信息。结合地球化学与地球物理勘查方法建立了红旗岭钢镍矿床综合找矿模型，利用找矿模型评价了红旗岭矿区的岩体，确定沿老砬子-付家-黄瓜营子断裂带分布的镁铁-超模铁质岩体是找寻矿床的有利靶区。其中1号、7号岩体的深部应作为找寻大中型富矿岩体或隐代富矿岩体的有利靶区。 相似文献
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红旗岭镁铁-超镁铁岩侵入体及铜镍硫化物矿床的成岩成矿机制 总被引：7，自引：0，他引：7
红旗岭铜镍矿床地处华北地台与吉黑地槽系接触带--辉发河断裂北侧.区内出露30多个镁铁-超镁铁质岩体,其中1、7号超镁铁岩体中赋存铜镍硫化物矿(床)体.含矿岩体分相明显,各类岩石均具堆积结构.铜镍矿体呈似板状、脉状、透镜状及囊状赋存于超镁铁岩体底部橄榄辉岩相中.岩石学和地球化学研究表明,7号岩体形成以流动分异为主,1号岩体为重力分异;原始岩浆属拉斑玄武质,块状矿石系压滤作用产物,后续岩浆的补给和混合补充了成矿物质,硫化物不混溶程度受挥发分制约,矿床属岩浆深部熔离分异成因,成矿时代为印支期. 相似文献
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东昆仑夏日哈木铜镍矿床Ⅱ号岩体辉长岩形成年龄与找矿潜力 总被引：1，自引：0，他引：1
东昆仑夏日哈木铜镍矿床以赋存110万吨Ni金属成为全球镍床近二十年来最重要的发现之一,也是仅次于金川岩浆铜镍矿床的中国第二大铜镍矿床。矿区发育5个镁铁-超镁铁质岩体,目前仅Ⅰ号镁铁-超镁铁岩体内发现了具有经济价值的超大矿体,110万吨Ni金属均赋存Ⅰ号岩体内;其他4个岩体中仅Ⅱ号岩体发现了矿化,是多种构造体制叠加岩浆活动的结果。调查发现Ⅱ号岩体的主要岩性是辉长岩,LA ICP-MS锆石U-Pb测试获得Ⅱ号岩体辉长岩的成岩年龄为385.2 Ma,比Ⅰ号岩体成岩成矿时代稍年轻,属于早泥盆世岩浆活动的产物。岩浆铜镍矿体多赋存于辉石岩与橄榄岩中,辉长岩内一般无经济价值的矿体存在。在夏日哈木矿区,辉长岩基本是含矿辉石岩及橄榄岩的围岩,辉长岩中所见的铜镍矿化也是后期岩浆活动贯入的表现。结合区域年代学综合分析认为,夏日哈木超大型岩浆铜镍硫化物矿床的形成,是早泥盆世早期岩浆活动于柴达木盆地边缘东昆仑造山带夏日哈木地区具体的成矿表现。目前所发现的Ⅱ号岩体以辉长岩为主,不具备成镍矿良好条件,较难发现有经济价值的铜镍矿体。 相似文献
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最新的矿产调查工作在冈底斯西段火山岩区新发现了拔隆银锡多金属矿床,地表矿体表现为受火山沉积断陷盆地边缘逆冲断隆带、火山机构及次级断裂控制的脉状矿体.为了查明该矿床的成因,开展了含矿火山岩锆石U-Pb年代学、矿石矿物学、地球化学及S-Pb同位素等研究.结果表明:拔隆矿床含矿火山岩锆石LA-ICP-MS U-Pb加权平均年龄为126.5±1.2 Ma,矿物组合以中低温为主、兼有少量中高温矿物,闪锌矿Zn/Cd和Zn/Fe比值变化分别介于321~17 407、2.4~4.4,黄铁矿Co/Ni比值为2.2~3.6,硫化物样品δ34S值变化于2.94‰~4.48‰,206Pb/204Pb比值为18.590~18.779,207Pb/204Pb比值为15.636~15.865,208Pb/204Pb比值为38.883~39.991,具有岩浆硫、上地壳铅特征,矿床的形成与冈底斯西段早白垩世火山活动晚期的次火山热液密切相关.经与世界典型银锡多金属矿床的对比认为,拔隆矿床的成矿特征与世界大型-超大型银锡多金属矿床较相似,地表矿体属于浅成低温热液型银多金属矿体,向下可能发育有斑岩型锡多金属矿体.拔隆矿床富银含锡的成矿特征在冈底斯西段属于首次发现,该发现不仅为研究冈底斯西段火山岩区矿床成因类型提供了新的资料和约束,还极大地拓宽了冈底斯西段火山岩区的找矿视野. 相似文献
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胶东地区大型、特大型金矿都严格受构造控制,具有多期多阶段叠加成晕特点,一般都有1~2个主成矿阶段.在矿体周围能形成异常的元素有Au、Ag、Cu、Pb、Zn、As、Sb、Bi、Mo、Hg、Co、Mn、Ni、W（F、B）等元素.单阶段形成的晕具有明显的垂直分带,Hg、As、Sb（B、F）强异常总是分布在矿体上部及前缘,而Bi、Mo、Mn、Co、Ni的强异常总是分布于矿体下部及尾晕,Au、Ag一般正相关,Cu、Pb、Zn有时偏于矿体上部,有时偏于下部.典型金矿床的元素组合及矿床地球化学异常垂直分带特征是研究金矿床原生叠加晕叠加结构、建立矿床叠加晕模型、确定盲矿体预测的重要标志. 相似文献
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Although the Tongling district is one of the most important Cu districts in China, exploration strategies need to be urgently updated to achieve a more predictive method for discovering hidden ore bodies. This paper presents a case study showing how new exploration strategies were developed and successfully used to discover a hidden ore body in the Fenghuangshan ore field of the Tongling district. All previously discovered ore bodies in the Fenghuangshan ore field were Cu skarn deposits located where dilational fault zones cut the contact zone of the Xingwuli granitoid complex. The features of the ores and the related magmatic rocks and hydrothermal alteration suggest that porphyry copper deposits are also likely to be present in the ore field. After assessing spatial controls on ore formation, ore-related indicators numerical simulating the coupled thermal–hydrological–mechanical processes during syn-deformation cooling of the Xingwuli Intrusion were used to choose a target area to the south of the Fenfhuangshan mine. In this target area, we have carried out an exploration program involving mapping, rock chip sampling for Cu in the fractured and altered rocks, and pesu-random triple frequency induced polarization (IP) and the controlled source audio-frequency magnetotellurics (CSAMT) surveys. Synthesis of the data obtained in this program identified a target that was subsequently drilled. This test hole demonstrated the presence of high grade Cu ores typical of both skarn and porphyry copper deposits. 相似文献
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云南澜沧老厂矿区含铜黄铁矿体
的确认及其资源意义 总被引：1，自引：0，他引：1
[摘 要] 云南澜沧老厂多金属矿床是滇西昌宁-孟连晚古生代裂谷带中的重要矿床之一。2008 年以来,在矿区玉号铅锌银矿体群之下发现和确认新的含铜黄铁矿体群(V 号矿体群)。该类矿体群受地层及岩性控矿明显,赋存于下石炭统裂谷型火山-沉积建造中(C+615),产状与含矿地层一致,围岩主要为凝灰岩、沉凝灰岩和白云质灰岩。矿石中常见微细粒结构和纹层状构造。它与玉号矿体群之间构成“上黑下黄冶的矿体分带。尽管矿体受后期构造影响变形,并受新生代岩浆热液成矿作用的改造-叠加,但仍具有火山喷流成因块状硫化物矿床的基本特征。研究还表明,本类矿体中铜的资源储量达到中型规模,是矿区重要的成矿类型和资源类型之一,可作为良好的近期接替资源,对其开发利用,能大幅缓解矿山的资源危机。 相似文献
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P. Hakanen 《Journal of Geochemical Exploration》1983,19(1-3)
The Outokumpu region in eastern Finland is an integral part of the Precambrian formations of the Karelidic orogeny. The copper-cobalt ore deposits discovered in the region are associated with a lithologic complex that consists of serpentinites, skarns, carbonate rocks and quartzites. The outer zone of this rock association adjacent to the surrounding mica schists is commonly occupied by black schists. The association constitutes the coherent stratigraphic sequence known as the Outokumpu zone, which is the environment in which the ore deposits of the Outokumpu type occur. The total length of the ribbon-like zone is about 240 km. Three Cu---Co ore deposits: Outokumpu, Vuonos and Luikonlahti are currently being exploited and four sub-economic ore showings have been found in the zone. All the deposits and ore showings are of the polymetallic sulphide type with copper, zinc, cobalt and nickel. There are also small amounts of silver, gold, tin and selenium in the orebodies. These stratabound ore deposits are submarine volcanic exhalative in origin. The immediate host rock of the ore is commonly quartzite, interpreted as a chemical silica precipitate.The Outokumpu copper-cobalt ore deposit was discovered in 1910. Owing to its economic potential, the Outokumpu zone is one of the most thoroughly studied parts of the Finnish Precambrian. More than 1000 holes have been drilled from the surface into the zone and provide a large source of material for lithogeochemical studies.The association does not lend itself easily to geophysical investigations because of its complex geology, characterized by black schists and other rocks giving a strong geophysical response. For this reason, and because of the extensive drilling, lithogeochemistry has become an important exploration tool in the region.The discovery of the blind Vuonos ore deposit in 1965 was the result of a comprehensive lithogeochemical study carried out in the early 1960's. Several old prospects were sampled in the Outokumpu zone and the sulphide phase was analyzed for Cu, Co, Ni and Zn.Clustering of the analytical data gives five groups of rock types: (1) quartzite-skarn-dolomite; (3) black schists; (4) mica schists; (5) copper-cobalt ore (Huhma and Huhma, 1970). The locations of these groups in Ni---Co and Cu---Co diagrams and in an Co---Cu---Ni triangular diagram are shown in Figs. 1, 2 and 3. The nickel content of serpentinites varies between 1500 and 2200 ppm and that of cobalt between 70 and 110 ppm. Thus the Ni/Co ratio averages 20:1. In the quartzite-skarn-dolomite-group the nickel content ranges from 900 to 3000 ppm and the cobalt content from 50 to 120 ppm. The Ni/Co 150 to 500 ppm and the cobalt content from 20 to 60 ppm. The Ni/Co ratio is about 10:1. Mica gneisses are poor in sulphides. Their nickel content averages from 40 to 90 ppm and the cobalt content from 15 to 30 ppm.The copper-cobalt ore occupies a discrete area in the Ni---Co diagram. Its nickel content varies between 1000 and 2000 ppm and the cobalt content between 1000 and 3000 ppm. The copper-cobalt diagram shows that the cobalt content of the serpentinites and the quartzite-skarn-dolomite group is fairly constant varying between 60 and 140 ppm. The copper content ranges from zero to 100 ppm in the former and from 10 to 100 ppm in the latter. In black schists the copper content varies from 100 to 300 ppm, the cobalt content being some tens of ppm. The mica gneisses are somewhat poorer in their Cu and Co contents. In this case too, the copper-cobalt ore has a Cu---Co content distinctly apart from those of the other groups.In the Cu---Co---Ni triangular diagram the serpentinite and the quartzite groups plot near the Ni apex of the triangle, the relative Ni content being 94–96% and that of Cu less than 1%. The black schists and mica gneisses have their own area near the centre of the Cu---Ni join with the Co content not exceeding 10%. There are several exceptions where points in the diagrams described above plot outside the normal field. Most of these anomalous points are located between the normal area of the rock type and that of the Cu---Co ore. The Ni---Co diagram in particular demonstrates that the deviations are due to the increase in the Co content.In summary, the anomalies of the Outokumpu type have: (1) a Ni/Co ratio lower than 15:1; and (2) a Cu percentage of the sum Cu+Co+Ni = 100 higher than 5. These anomaly units are applied to rank the analytical data of the Outokumpu zone. It is evident from the diagrams that the increase in cobalt content outside its normal field is the prime indication of the proximity of the ore. Being rather constant, the nickel content is used as a reference. Thus a decrease in the Ni/Co ratio indicates the presence of the ore. In some cases the decrease in the Ni/Co ratio may be due to a local decrease in the Ni content. The anomaly can be checked by the Cu/Cu+Ni+Co ratio. Except when testing the anomalies with Co, Cu and Ni as described above, the Co content alone can be used as an indicator of the proximity of a Cu---Co orebody. This was tested in one section of the Vuonos orebody (Fig. 4). The pyrite phase of the quartzites was selectively leached and its Co content analyzed. It was noted that the Co content of pyrite increased somewhat when the orebody was approached along strike.Before this method can be used more widely, the stratigraphic position and the structure of the potential ore horizon must be known fairly accurately. The proximity of an orebody can also be evaluated by means of the Co content of the black schists. As shown above, the Co content of the black schists is usually considerably under 100 ppm; it is usually over 100 ppm only adjacent to an orebody. Consequently, the extensive data on black schists in the Outokumpu zone can be sorted into potential and less potential ones. 相似文献
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Geochemical Characteristics,Genesis of Concealed Cu-rich Ore Body in the Jinchuan Deposit,Northwestern China,and Its Prospecting 总被引：1，自引：1，他引：0
Abstract: The Jinchuan deposit is hosted by the olivine-rich ultramafic rock body, which is the third-largest magmatic sulfide Ni–Cu deposit in the world currently being exploited. Seeking new relaying resources in the deep and the border of the deposit becomes more and more important. The ore body, ore and geochemistry characteristics of the concealed Cu-rich ore body are researched. Through spatial analysis and comparison with the neighboring II1 main ore body, the mineralization rule of the concealed Cu-rich ore body is summed up. It is also implied that Cu-rich magma may exist between Ni-rich magma and ore pulp during liquation differentiation in deep-stage chambers, which derives from deep-mantle Hi–MgO basalt magma. It is concluded that the type of ore body has features of both magmatic liquation and late reconstruction action. It has experienced three stages: deep liquation and pulsatory injection of the Cu- and PPGE-rich magma, concentration of tectonic activation, and the later magma hydrothermal superimposition. In addition, the Pb and S isotopes indicate the magma of I6 concealed Cu-rich ore body originates predominantly from mantle; however, it is interfused by minute crust material. Finally, it is inferred that the genesis of the Cu–Ni sulfide deposit is complex and diverse, and the prospect of seeking new deep ore bodies within similar deposits is promising, especially Cu-rich ore bodies. 相似文献
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哀牢山长安金矿成因机制及动力学背景初探：来自LA-ICP-MS锆石U-Pb定年和黄铁矿原位微量元素测定的证据 总被引：3，自引：3，他引：0
长安金矿床是哀牢山成矿带南段大型矿床之一,金矿化位于志留系、奥陶系之间发育的不整合面内,矿体整体呈透镜状。矿区内脉岩广布,矿体与脉岩共生或被脉岩切穿,表明金成矿与金沙江-哀牢山新生代富碱斑岩的侵入关系密切。本文在较为详细的野外观察基础上,对侵入矿体内的脉岩进行LA-ICP-MS U-Pb测年表明,细晶正长岩脉和正长斑岩的成岩年龄分别为32.5±0.1Ma和33.0±0.1Ma,与哀牢山的新生代富碱斑岩金多金属矿床的成矿时代(34±2Ma)基本一致。通过对长安金矿床、铜厂铜钼金矿床、长安冲铜钼金矿床中黄铁矿的LA-ICP-MS原位微量元素分析,发现黄铁矿中成矿元素含量随Co/Ni比值的下降而上升,呈一定的负相关性,可能指示其成矿物质主要来源于岩浆流体。结合前人的研究成果,表明喜山期强烈的壳幔作用导致大规模的富碱岩浆上侵,不仅为含矿流体的上升提供了动力和热能,而且还是成矿物质和成矿流体的主要来源。 相似文献