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1.
Trace element and REE geochemistry of the Zhewang gold deposit,southeastern Guizhou Province,China 总被引：1，自引：0，他引：1
The quartz vein-type gold deposits are widely hosted by the Neoproterozoic （Xiajiang Group） epimeta- morphic clastic rock series in southeastern Guizhou Province, China. The Zhewang gold deposit studied in this paper occurs in the second lithologieal member of the Pinglue Formation of the Xiajiang Group. Trace element geochemis- try of host rocks, quartz veins and arsenopyrite has revealed that ore-forming fluid was enriched in sulphophile ele- ments such as Au, Ag, As, Sb, Pb and Zn, and simultaneously concentrated some magmaphile elements such as W and Mo, which probably provides some evidence for multi-stage mineralization or overprinting of magmatic hydro- therm. Quartz veins and arsenopyrite were characterized by depletion in HFSE and enrichment in LREE. Hf/Sm, Nb/La and Th/La imply that the ore-forming fluid was probably a NaC1-H20 solution system enriched in more C1 than F; Th/U values reflect the strong reducibility of the ore-forming fluid, coincident with the sulfide assemblages. The values of Co/Ni reflect that magmatic fluids may have partly participated in the ore-forming process and Y/Ho values have proved that the ore-forming fluid was associated with metamorphism and exotic hydrotherm which has reformed former quartz veins during late mineralization. The concentrations of REE, Eu anomalies and Ce anomalies of this deposit display that ore-forming elements mainly were derived from host rocks and possibly from a mixed deep source, and the ore-forming fluid was mixed by dominant metamorphic fluid and minor other sources. The physical-chemical conditions of ore-forming fluid changed from the initial stage to the late stage. The metamorphic fluid is responsible for the mineralization. Therefore, the Zhewang gold deposit is classified as a quartz vein-type gold deposit which may have been reformed by magmatic fluids during the late stage. 相似文献
2.
CAO Yi DU Yangsong PANG Zhenshan DU Yilun KOU Shaolei CHEN Linjie GAO Fuping ZHOU Guibi 《《地质学报》英文版》2015,89(3):746-765
The Datuanshan deposit is one of the largest and most representative stratabound copper deposits in the Tongling area,the largest ore district in the Middle-Lower Yangtze River metallogenic belt.The location of the orebodies is controlled by the interlayer-slipping faults between the Triassic and Permian strata,and all the orebodies are distributed in stratiform shape around the Mesozoic quartz monzodiorite dikes.Based on field evidence and petrographic observations,four mineralization stages in the Datuanshan deposit have been identified:the skarn,early quartz-sulfide,late quartzsulfide and carbonate stages.Chalcopytite is the main copper mineral and mainly formed at the late quartz-sulfide stage.Fluid inclusions at different stages were studied for petrography,microthermometry,laser Raman spectrometry and stable isotopes.Four types of fluid inclusions,including three-phase fluid inclusions(type 1),liquid-rich fluid inclusions(type 2),vapour-rich fluid inclusions(type 3) and pure vapour fluid inclusions(type 4),were observed.The minerals from the skarn,early and late quartz-sulfide stages contain all fluid inclusion types,but only type 2 fluid inclusions were observed at the carbonate stage.Petrographic observations suggest that most of the inclusions studied in this paper are likely primary.The coexistence of different types of fluid inclusions with contrasting homogenization characteristics(to the liquid and vapour phase,respectively) and similar homogenization temperatures(the modes are 440-480℃,380-400℃ and 280-320℃ for the skarn,early and late quartz-sulfide stages,respectively) in the first three stages,strongly suggests that three episodes of fluid boiling occurred during these stages,which is supported by the hydrogen isotope data.Laser Raman spectra identified CH_4 at the skarn and early quartz-sulfide stages.Combined with other geological features,the early ore-forming fluids were inferred to be under a relatively reduced environment.The CO_2 component has been identified at the late quartz-sulfide and carbonate stages,indicating that the late ore-forming fluids were under a relatively oxidized environment,probably as a result of inflow of and mixing with meteoric water.In addition,microthermometric results of fluid inclusions and H-O isotope data mdicate that the ore forming fluids were dominated by magmatic water in the early stages(skarn and early quartz-sulfide stages) and mixed with meteoric water in the late stages(late quartz-sulfide and carbonate stages).The evidence listed above suggests that the chalcopyrite deposition in the Datuanshan deposit probably resulted from the combination of multiepisode fluid boiling and mixing of magmatic and meteoric water. 相似文献
3.
LEE Hyun Koo 《《地质学报》英文版》2003,77(1):116-124
A comprehensive contrast of ore-forming geological background and ore-forming fluid features, especially fluid ore-forming processes, has been performed between the Tianmashan and the Datuanshan ore deposits in Tongling, Anhui Province. The major reasons for the formation of the stratabound skarn Au-S ore deposit in Tianmashan and the stratabound skarn Cu ore deposit in Datuanshan are analyzed in accordance with this contrast. The magmatic pluton in Tianmashan is rich in Au and poor in Cu, but that in Datuanshan is rich in Cu and Au. The wallrock strata in Tianmashan contain Au-bearing pyrite layers with some organic substance but those in Datuanshan contain no such layers. Moreover, the ore-forming fluids in Tianmashan are dominantly magmatic ones at the oxide and sulfide stages, but those with high content of Cu in Datuanshan are mainly groundwater fluids. In addition, differences in compositional evolution and physicochemical condition variation of the ore-forming fluids result in gradual dispersion 相似文献
4.
He–Ar Isotopic Tracing of Pyrite from Ore-forming Fluids of the Sanshandao Au Deposit, Jiaodong Area
HAN Zhenyu YU Xiaowei LI Shoujun Tian Jingxiang WANG Zhongliang YU Xiaojing WANG Ligong 《《地质学报》英文版》2019,93(6):1797-1807
The Sanshandao Au deposit is located in the famous Sanshandao metallogenic belt, Jiaodong area. To date, accumulative Au resources of 1000 t have been identified from the belt. Sanshandao is a world-class gold deposit with Au mineralization hosted in Early Cretaceous Guojialing-type granites. Thus, studies on the genesis and ore-forming element sources of the Sanshandao Au deposit are crucial. He and Ar isotopic analyses of fluid inclusions from pyrite(the carrier of Au) indicate that the fluid inclusions have 3 He/4 He=0.043–0.21 Ra with an average of 0.096 Ra and 40 Ar/36 Ar=488–664 with an average of 570.8. These values represent the initial He and Ar isotopic compositions of ore-forming fluids for trapped fluid inclusions. The comparison of H–O isotopic characteristics combined with deposit geology and wall rock alteration reveals that the ore-forming fluids of the Sanshandao Au deposit show mixed crust–mantle origin characteristics, and they mainly comprise crust-derived fluid mixed with minor mantle-derived fluid and meteoric water during the uprising process. The ore-forming elements were generally sourced from pre-Cambrian meta-basement rocks formed by Mesozoic reactivation and mixed with minor shallow crustal and mantle components. 相似文献
5.
Kamal SIAHCHESHM Nasrin KHAJEMOHAMMADLO Ali Asghar CALAGARI Ali ABEDINI 《《地质学报》英文版》2021,95(3):846-859
The Aghbolaq skarn deposit is located in the Urumieh-Golpayegan plutonic belt,NW Iran.The garnetite skarn(stage I) has been intensely cross-cut by the magnetite-garnet skarn (stage II) which were,in turn,cut and offset by the orehosting quartz veins/veinlets (stage III).The predominance of andradite (Adr_(82.5–89.1)) and its high Fe~(3+)/Al ratio (up to 1685)apparently supports the high f O_2,salinity and prevalence of magmatic/hydrothermal fluids involved,rather than meteoric waters,during the magnetite-garnet skarn formation.Two major groups of fluid inclusions,namely aqueous (LV,LVS) and aqueous–carbonic (LV_C,LL_CV_C),were recognized in garnet and quartz veins that,especially in growth zones and along intra-granular trails,better display fluid inclusion assemblages (FIAs) than those in clusters.The prograde magnetite-garnet skarn was formed by the metasomatic fluid at relatively high T_h (209–374℃),under a lithostatic pressure of～200 bars.The retrograde mineralized quartz veins were formed at temperatures ranging from 124℃to 256℃,by dilute and less saline(2.57–11.93 wt%Na Cl eq.) hydrothermal fluids under a hydrostatic pressure of～80 bars.The fluid evolution of the Aghbolaq skarn began with an earlier simple cooling of metasomatic fluid during the prograde stage,followed by the later influx of low salinity meteoric fluids during the retrograde stage. 相似文献
6.
The Sin Quyen-Lung Po district is an important Cu metallogenic province in Vietnam, but there are few temporal and genetic constraints on deposits from this belt. Suoi Thau is one of the representative Cu deposits associated with granitic intrusion. The deposit consists of ore bodies in altered granite or along the contact zone between granite and Proterozoic meta-sedimentary rocks. The Cu-bearing intrusion is sub-alkaline I-type granite. It has a zircon U-Pb age of ~776 Ma, and has subduction-related geochemical signatures. Geochemical analysis reveals that the intrusion may be formed by melting of mafic lower crust in a subduction regime. Three stages of alteration and mineralization are identified in the Suoi Thau deposit, i.e., potassic alteration; silicification and Cu mineralization; and phyllic alteration. Two-phase aqueous fluid inclusions in quartz from silicification stage show wide ranges of homogenization temperatures(140–383℃) and salinities(4.18wt%–19.13wt%). The high temperature and high salinity natures of some inclusions are consistent with a magmatic derivation of the fluids, which is also supported by the H-O-S isotopes. Fluids in quartz have δD values of –41.9‰ to –68.8‰. The fluids in isotopic equilibrium with quartz have δ~(18)O values ranging from 7.9‰ to 9.2‰. These values are just plotted in the compositional field of magmatichydrothermal fluids in the δD_(water) versus δ~(18)O_(water) diagram. Sulfide minerals have relatively uniform δ~(34)S values from 1.84‰ to 3.57‰, which is supportive of a magmatic derivation of sulfur. The fluid inclusions with relatively low temperatures and salinities most probably represent variably cooled magmatic-hydrothermal fluids. The magmatic derivation of fluids and the close spatial relationship between Cu ore bodies and intrusion suggest that the Cu mineralization most likely had a genetic association with granite. The Suoi Thau deposit, together with other deposits in the region, may define a Neoproterozoic subduction-related ore-forming belt. 相似文献
7.
The Zhaxikang Pb-Zn-Ag-Sb deposit, the largest polymetallic deposit known in the Himalayan Orogen of southern Tibet, is characterized by vein-type mineralization that hosts multiple mineral assemblages and complicated metal associations. The deposit consists of at least six steeply dipping veintype orebodies that are hosted by Early Jurassic black carbonaceous slates and are controlled by a Cenozoic N–S-striking normal fault system. This deposit records multiple stages of mineralization that include an early period(A) of massive coarse-grained galena–sphalerite deposition and a later period(B) of Sb-bearing vein-type mineralization. Period A is only associated with galena–sphalerite mineralization, whereas period B can be subdivided into ferrous rhodochrosite–sphalerite–pyrite, quartz–sulfosalt–sphalerite, calcite–pyrite, quartz–stibnite, and quartz-only stages of mineralization. The formation of brecciated galena and sphalerite ores during period A implies reworking of pre-existing Pb–Zn sulfides by Cenozoic tectonic deformation, whereas period B mineralization records extensive openspace filling during ore formation. Fluid inclusion microthermometric data indicate that both periods A and B were associated with low–medium temperature(187–267°C) and low salinity(4.00–10.18% wt. Na Cl equivalent) ore-forming fluids, although variations in the physical–chemical nature of the period B fluids suggest that this phase of mineralization was characterized by variable water/rock ratios. Microprobe analyses indicate that Fe concentrations in sphalerite decrease from period A to period B, and can be divided into three groups with Fe S concentrations of 8.999–9.577, 7.125–9.109, 5.438–1.460 mol.%. The concentrations of Zn, Sb, Pb, and Ag within orebodies in the study area are normally distributed in both lateral and vertical directions, and Pb, Sb, and/or Ag concentrations are positive correlation within the central part of these orebodies, but negatively correlate in the margins. Sulfide S isotope compositions are highly variable(4‰–13‰), varying from 4‰ to 11‰ in period A and 10‰ to 13‰ in period B. The Pb isotope within these samples is highly radiogenic and defines linear trends in 206 Pb/204 Pb vs. 207 Pb/204 Pb and 206 Pb/204 Pb vs. 208 Pb/204 Pb diagrams, respectively. The S and Pb isotopic characteristics indicate that the period B orebodies formed by mixing of Pb–Zn sulfides and regional Sbbearing fluids. These features are indicative of overprinting and remobilization of pre-existing Pb–Zn sulfides by Sb-bearing ore-forming fluids during a post-collisional period of the Himalayan Orogeny. The presence of similar ore types in the north Rhenish Massif that formed after the Variscan Orogeny suggests that Zhaxikang-style mineralization may be present in other orogenic belts, suggesting that this deposit may guide Pb–Zn exploration in these areas. 相似文献
8.
GONG Xiaodong YAN Guangsheng YE Tianzhu ZHU Xinyou LI Yongsheng ZHANG Zhihui JIA Wenbin YAO Xiaofeng 《《地质学报》英文版》2015,89(3):822-835
The Dahutang tungsten polymetallic ore field is located north of the Nanling W-Sn polymetallic metallogenic belt and south of the Middle—Lower Yangtze River Valley Cu-Mo-Au-Fe porphyry-skarn belt.It is a newly discovered ore field,and probably represents the largest tungsten mineralization district in the world.The Shimensi deposit is one of the mineral deposits in the Dahutang ore field,and is associated with Yanshanian granites intruding into a Neoproterozoic granodiorite batholith.On the basis of geologic studies,this paper presents new petrographic,microthermometric,laser Raman spectroscopic and hydrogen and oxygen isotopic studies of fluid inclusions from the Shimensi deposit.The results show that there are three types of fluid inclusions in quartz from various mineralization stages:liquid-rich two-phase fluid inclusions,vapor-rich two-phase fluid inclusions,and three-phase fluid inclusions containing a solid crystal,with the vast majority being liquid-rich two-phase fluid inclusions.In addition,melt and melt-fluid inclusions were also found in quartz from pegmatoid bodies in the margin of the Yanshanian intrusion.The homogenization temperatures of liquid-rich two-phase fluid inclusions in quartz range from 162 to 363℃ and salinities are 0.5wt%-9.5wt%NaCI equivalent.From the early to late mineralization stages,with the decreasing of the homogenization temperature,the salinity also shows a decreasing trend.The ore-forming fluids can be approximated by a NaCl-H_2O fluid system,with small amounts of volatile components including CO_2,CH_4 and N_2,as suggested by Laser Raman spectroscopic analyses.The hydrogen and oxygen isotope data show that δ5D_(V-smow) values of bulk fluid inclusions in quartz from various mineralization stages vary from-63.8‰ to-108.4‰,and the δ~(18)O_(H2O) values calculated from the δ~(18)O_(V-)smow values of quartz vary from-2.28‰ to 7.21‰.These H-O isotopic data are interpreted to indicate that the ore-forming fluids are mainly composed of magmatic water in the early stage,and meteoric water was added and participated in mineralization in the late stage.Integrating the geological characteristics and analytical data,we propose that the ore-forming fluids of the Shimensi deposit were mainly derived from Yanshanian granitic magma,the evolution of which resulted in highly differentiated melt,as recorded by melt and melt-fluid inclusions in pegmatoid quartz,and high concentrations of metals in the fluids.Cooling of the ore-forming fluids and mixing with meteoric water may be the key factors that led to mineralization in the Dahutang tungsten polymetallic ore field. 相似文献
9.
The Dahongshan Fe-Cu (-Au) deposit is a superlarge deposit in the Kangdian metallogenic belt, southwestern China, comprising approximately 458 Mt of Fe ores (40% Fe) and 1.35 Mt Cu. Two main types of Fe-Cu (-Au) mineralization are present in the Dahongshan deposit: (1) early submarine volcanic exhalation and sedimentary mineralization characterized by strata-bound fine-grained magnetite and banded Fe-Cu sulfide (pyrite and chalcopyrite) hosted in the Na-rich metavolcanic rocks; (2) late hydrothermal (-vein) type mineralization characterized by Fe-Cu sulfide veins in the hosted strata or massive coarse-grained magnetite orebodies controlled by faults. While previous studies have focused primarily on the early submarine volcanic and sedimentary mineralization of the deposit, data related to late hydrothermal mineralization is lacking. In order to establish the metallogenic age and ore-forming material source of the late hydrothermal (-vein) type mineralization, this paper reports the Re-Os dating of molybdenite from the late hydrothermal vein Fe-Cu orebody and H, O, S, and Pb isotopic compositions of the hydrothermal quartz-sulfide veins. The primary aim of this study was to establish the metallogenic age and ore-forming material source of the hydrothermal type orebody. Results show that the molybdenite separated from quartz-sulfide veins has a Re-Os isochron age of 831 ± 11 Ma, indicating that the Dahongshan Fe-Cu deposit experienced hydrothermal superimposed mineralization in Neoproterozoic. The molybdenite has a Re concentration of 99.7–382.4 ppm, indicating that the Re of the hydrothermal vein ores were primarily derived from the mantle. The δ34S values of sulfides from the hydrothermal ores are 2‰–8‰ showing multi-peak tower distribution, suggesting that S in the ore-forming period was primarily derived from magma and partially from calcareous sedimentary rock. Furthermore, the abundance of radioactive Pb increased significantly from ore-bearing strata to layered and hydrothermal vein ores, which may be related to the later hydrothermal transformation. The composition of H and O isotopes within the hydrothermal quartz indicates that the ore-forming fluid is a mixture of magmatic water and a small quantity of water. These results further indicate that the late hydrothermal orebodies were formed by the Neoproterozoic magmatic hydrothermal event, which might be related to the breakup of the Rodinia supercontinent. Mantle derived magmatic hydrothermal fluid extracted ore-forming materials from the metavolcanic rocks of Dahongshan Group and formed the hydrothermal (-vein) type Fe-Cu orebodies by filling and metasomatism. 相似文献
10.
XIE Guiqing MAO Jingwen ZHU Qiaoqiao HAN Yingxiao LI Wei DUAN Chao YE Hui 《《地质学报》英文版》2020,94(6):1797-1807
Cu and Fe skarns are the world’s most abundant and largest skarn type deposits, especially in China, and Au-rich skarn deposits have received much attention in the past two decades and yet there are few papers focused on schematic mineral deposit models of Cu–Fe–Au skarn systems. Three types of Au-rich deposits are recognized in the Edongnan region, Middle–Lower Yangtze River metallogenic belt: ~140 Ma Cu–Au and Au–Cu skarn deposits and distal Au–Tl deposits; 137–148 Ma Cu–Fe; and 130–133 Ma Fe skarn deposits. The Cu–Fe skarn deposits have a greater contribution of mantle components than the Fe skarn deposits, and the hydrothermal fluids responsible for formation of the Fe skarn deposits involved a greater contribution from evaporitic sedimentary rocks compared to Cu–Fe skarn deposits. The carbonate-hosted Au–Tl deposits in the Edongnan region are interpreted as distal products of Cu–Au skarn mineralization. A new schematic mineral deposit model of the Cu–Fe–Au skarn system is proposed to illustrate the relationship between the Cu–Fe–Au skarn mineralization, the evaporitic sedimentary rocks, and distal Au–Tl deposits. This model has important implications for the exploration for carbonate–hosted Au–Tl deposits in the more distal parts of Cu–Au skarn systems, and Fe skarn deposits with the occurrence of gypsum-bearing host sedimentary rocks in the MLYRB, and possibly elsewhere. 相似文献
11.
缅甸佤邦糯巴矿区锡多金属矿是近年来在缅甸东部第二特区探明的中型锡矿, 锡矿石品位较高并伴生铅锌等多种有色金属。矿床类型为典型高-中温度热液脉型矿床, 矿体形体规模严格受区内近南北向和近东西向两组断裂构造控制。本文介绍了缅甸佤邦糯巴矿区锡多金属矿的地质特征, 从区域地层、构造、围岩蚀变、矿石类型、控矿特征等方面对矿产进行综合分析。 相似文献
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麻利索克(Maniitsoq)位于格陵兰首府努克以北约160km处,是近年新发现的超大型高品位镍铜矿床。北美镍业公司对该矿床进行了一系列的勘查活动,累计施工钻探29840m,其中MQ-16-117钻孔268.70~342.75m段长74.05m的岩心中,Ni含量1.08%,Cu含量0.54%。由于中国科技界和企业对走出去参与格陵兰地区的矿产勘查开发甚感兴趣,因此系统研究该矿床的地质特征与资源潜力很有必要。全面收集、分析了该矿床的有关资料,并和中国的金川镍矿进行对比,结果显示,麻利索克镍铜矿为"小岩体成大矿"的典型代表,属于深部"熔离-贯入成矿"成矿机制;根据以往的勘查资料,评价其镍的金属量为195×104t,为世界级规模,建议中国企业重点关注。 相似文献
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福建省紫金山铜金矿床成矿物理化学条件的研究 总被引：4，自引：0，他引：4
紫金山高硫浅成低温热液型铜金矿床以一套独具特色的由地开石、明矾石组成的高级泥质蚀变和由硫砷铜矿、蓝辉铜矿、铜蓝组成的铜矿物组合为特征。本文根据矿床的蚀变矿物和矿石矿物组合及矿物的相互关系，着重应用热力学的原理与方法研究矿床形成的物理化学条件。认为形成这一类型矿床的流体是一种高氧逸度、高硫逸度的中低温酸性流体。 相似文献
16.
内蒙古黄岗梁锡铁多金属矿床层状夕卡岩的喷流沉积成因 总被引：6，自引：1，他引：6
内蒙古自治区黄岗梁矿床是大兴安岭中南段的一个大型Sn-Fe多金属矿床,燕山期火山侵入岩广泛出露,通过对矿床地球化学特征的系统研究,并结合矿床地质特征,得出的主要研究成果为:①与含微细浸染胶状锡的磁铁矿层共生的层状夕卡岩与海底火山活动关系密切,是一种很具特色的喷流岩;②REE地球化学特征表明,该矿床层状夕卡岩与典型岩浆热液接触交代夕卡岩存在较大差异,而与现代海底热流体和喷流型矿床及其共生的热水沉积岩有较大的相似性,应属热水喷流成因;③层状夕卡岩的碳、氧同位素组成关系可与许多沉积喷流型块状硫化物矿石及其共生的喷流岩相对比,暗示了两者具有相似的形成机理。 相似文献
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三江特提斯叠加成矿作用样式及过程 总被引：78，自引：64，他引：14
三江地区经历了特提斯洋的多期洋-陆俯冲和新生代以来的陆-陆碰撞;成矿主要集中在大洋生长与俯冲造山阶段以及碰撞造山主碰撞向晚碰撞的转换阶段,控制了区域喜马拉雅期斑岩型铜金矿带、沉积岩容矿型铅锌多金属矿带与造山型金矿带等。在不同时期构造环境作用下,在矿田与矿床范围内形成了复杂多样的叠加成矿作用。叠加成矿作用可划分为3种类型及9种方式:(1)VMS-岩浆热液叠加型。包括喜马拉雅期岩浆热液型矿体叠加海西期-燕山期"VMS型"矿体(老厂式Pb-Zn-Mo矿床和鲁春式Cu-Pb-Zn矿床),印支/燕山期岩浆热液型矿体叠加海西期VMS型矿体的羊拉式Cu-Mo-Pb-Zn矿床;(2)沉积-热液叠加型。包括喜马拉雅期岩浆热液型矿体叠加燕山期沉积矿源层的白秧坪式Cu-Pb-Zn矿床,喜马拉雅期建造热液型Ge矿体叠加沉积煤层的大寨/中寨式Ge矿床,燕山期岩浆热液叠加加里东期分水岭式Fe-Cu矿床;(3)多期热液叠加型。主要为喜马拉雅期与印支期两期叠加成矿作用的老王寨床式Au矿床,燕山期叠加印支期普朗-红山式Cu矿床,喜马拉雅期多期次叠加的金满Cu矿床。叠加成矿作用增加矿床的资源储量,丰富了矿种类型;但是现在仅有部分年代学与矿田-矿床尺度地质现象的某些证据,叠加矿床的矿体-矿石结构特征、形成条件与地球化学及矿物学约束仍有待于进一步研究。 相似文献
19.
莫能锰矿为元古代形成的与含铁建造密切相关的锰矿床。本文系统总结了区域地质背景、锰矿床地质特征,并对含锰地层的岩相古地理进行了分析,认为含矿岩系为滨外浅海陆棚沉积。在此基础上,初步建立了矿床的成因模式,提出矿床成因属浅海沉积变质型。与世界上最大的锰矿田卡拉哈里锰矿田进行对比后,认为它们在成矿背景、成矿时代、矿床特征、岩相古地理条件及后生改造等方面均有相似之处,莫能锰矿具有成为大型锰矿床的找矿潜力。 相似文献
20.
西藏羌塘中部独泉沟地区发现青藏高原首例富锰矿 总被引：1，自引：0，他引：1
独泉沟锰矿是青藏高原发现的首例富锰矿,成矿元素分析结果表明,矿石中Mn平均品位为41.95%,达到了Ⅰ级富锰矿石的品位标准。该锰矿体主要呈层状、似层状产出于上二叠统—下三叠统天泉山组复理石碎屑岩内;矿体地表部分为残坡积,残坡积范围宽20~30m,长约50m。根据产状及结构构造的差异,将研究区锰矿体分为层状锰矿体和脉状锰矿体,二者的矿石矿物皆是硬锰矿,脉石矿物以石英为主。初步研究认为,独泉沟锰矿是海相热水沉积型锰矿。作为青藏高原地区发现的首例富锰矿,独泉沟锰矿的发现填补了区内锰矿找矿工作的空白,对其成因的研究能为今后的找矿工作提供重要的线索和依据,在区域找矿方面具有一定的指示意义。 相似文献