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1.
INTRODUCTIONShoshonitesarepotassicigneousrockswhichoccurmain-lyinsubduction-relatedtectonicsettings(Morrison,1980).Theyarecom...  相似文献   

2.
The purpose of this study is to evaluate the Spectral Angle Mapper (SAM) classification method for determining the optimum threshold (maximum spectral angle) to unveil the hydrothermal mineral assemblages related to mineral deposits. The study area indicates good potential for Cu-Au porphyry, epithermal gold deposits and hydrothermal alteration well developed in arid and semiarid climates, which makes this region significant for Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) image processing analysis. Given that achieving an acceptable mineral mapping requires knowing the alteration patterns, petrochemistry and petrogenesis of the igneous rocks while considering the effect of weathering, overprinting of supergene alteration, overprinting of hypogene alteration and host rock spectral mixing, SAM classification was implemented for argillic, sericitic, propylitic, alunitization, silicification and iron oxide zones of six previously known mineral deposits: Maherabad, a Cu-Au porphyry system; Sheikhabad, an upper part of Cu-Au porphyry system; Khoonik, an Intrusion related Au system; Barmazid, a low sulfidation epithermal system; Khopik, a Cu-Au porphyry system; and Hanish, an epithermal Au system. Thus, the investigation showed that although the whole alteration zones are affected by mixing, it is also possible to produce a favorable hydrothermal mineral map by such complementary data as petrology, petrochemistry and alteration patterns.  相似文献   

3.
论述了额尔古纳河-黑龙江上游两岸金、铜、钼成矿作用特点、分布和研究程度.提出了金、铜、钼最具找矿远景的工业类型矿床:斑岩型金(-铜)或含金斑岩型铜矿床;浅成低温热液型金-银及金-碲矿床;微细浸染型金-硫化物-石英矿床;斑岩型铜、铜钼矿床.此外,对今后区域普查找矿和成矿预测提出了建议.  相似文献   

4.
与火山—潜火山作用有关的浅成热液金(铜银)矿床可以分为低硫型和高硫型两个亚类,所对应的流体成矿系统分别为贵金属(地热)成矿系统和火山热液成矿系统。由于成矿位置和流体成矿过程不同,形成了各具特色的成矿元素组合、围岩蚀变特征和成矿类型。  相似文献   

5.
The geotectonic units of Zhejiang Province include the Yangtze Plate in the northwest juxtaposed against the South China fold system in the southeast along the Jiangshan–Shaoxing fault. The South China fold system is further divided into the Chencai–Suichang uplift belt and the Wenzhou–Linhai geotectogene belt, whose boundary is the Yuyao–Lishui fault. The corresponding metallogenic belts are the Mo–Au(–Pb–Zn–Cu) metallogenic belt in northwest Zhejiang, the Chencai–Suichang Au–Ag–Pb–Zn–Mo metallogenic belt, and the coastal Ag–Pb–Zn–Mo–Au metallogenic belt. The main Mesozoic metal ore deposits include epithermal Au–Ag(Ag), hydrothermal vein-type Ag–Pb–Zn(Cu), and porphyry–skarn-type Mo and vein-type Mo deposits. These ore bodies are related to the Mesozoic volcanic-intrusive structure: the epithermal Au–Ag(Ag) deposits are represented by the Zhilingtou Au–Ag deposit and Houan Ag deposit and their veins are controlled by volcanic structure; the hydrothermal vein-type Ag–Pb–Zn deposits are represented by the Dalingkou Ag–Pb–Zn deposit and also controlled by volcanic structure; and the porphyry–skarn-type Mo deposits are represented by the Tongcun Mo deposit and the vein-type Mo deposits are represented by the Shipingchuan Mo deposit, all of which are related to granite porphyries. These metal ore deposits have close spatio-temporal relationships with each other; both the epithermal Au–Ag(Ag) deposits and the hydrothermal vein-type Ag–Pb–Zn deposits exhibit vertical zonations of the metallic elements and form a Mo–Pb–Zn–Au–Ag metallogenetic system. These Jurassic–Cretaceous deposits may be products of tectonic-volcanic-intrusive magmatic activities during the westward subduction of the Pacific Plate. Favourable metallogenetic conditions and breakthroughs in the recent prospecting show that there is great resource potential for porphyry-type deposits (Mo, Cu) in Zhejiang Province.  相似文献   

6.
中亚成矿域中的斑岩型铜(钼金)矿,有别于滨太平洋区的斑岩铜矿,它们大部分是形成于大洋消亡之后,与A型俯冲或后碰撞阶段的构造岩浆作用有关,并非都形成于岛弧发展阶段,且常与浅成低温热液型金矿(产于陆相-亚陆相火山岩内)时间相随、空间相伴,两者属于一个统一的岩浆系统;浅部是浅成低温热液型金矿,深部是高温斑岩型铜(钼金)矿,其成矿特点表现出两者元素组合连续、过渡与转化,两者类型相随相伴。  相似文献   

7.
继20世纪80年代以来低硫型和高硫型浅成低温金矿床概念提出及成矿模型建立之后,相继发现一些浅成低温热液矿床不具上述两类矿床端元的成矿特点,相反兼具过渡性质;很多学者将其作为单一矿床类型,定义为中硫型浅成低温热液矿床。作为一个新的矿床类型,中硫型矿床是否有单独划分的必要?该类矿床具有什么样的地质特征?长期以来这些问题令人困惑。本文从大量文献中,在全球范围内甄别出24个比较明确的中硫型浅成低温热液金(多金属)矿床,基于其基本特征和研究进展的系统梳理与分析,从中硫型矿床的时空展布、地质特征、矿物组合、金属源区特征、中硫型与高硫型金(铜)矿和低硫型金矿的主要区别,以及目前国际研究进展及难点等方面进行总结阐述。中硫型金多金属矿床具有如下六大特征:(1)发育富碳酸盐-贱金属硫化物成矿体系,碳酸盐矿物可见于各成矿阶段热液脉系中,尤其在热液晚阶段以碳酸盐矿物为主;贱金属硫化物主要为Cu、Pb、Zn、Fe等的硫化物;(2)发育中硫化态矿物组合,如贱金属硫化物黄铜矿、闪锌矿、方铅矿、黄铁矿、黝铜矿等;可少量发育明矾石和冰长石;(3)含矿脉系中富硫化物(总量大于5%),且在斑岩铜矿系统中较富黄铜矿;(4)普遍发育浅色贫铁闪锌矿(有待进一步证实);(5)普遍赋存在挤压岛弧背景下斑岩Cu-Au-Mo矿的外围;(6)空间上可与高硫型和低硫型金多金属矿床共存。普遍发育斑岩型Cu-Au-(Mo)矿床和浅成低温热液型矿床的世界著名三大成矿域(滨太平洋成矿域、古亚洲洋成矿域和特提斯-喜马拉雅成矿域),同样具有形成中硫型矿床的有利成矿条件。未来关于中硫型矿床的研究亟需解决以下几个关键问题:(1)目前尚未有文献对"富碳酸盐-贱金属(Cu、Pb、Zn、Fe等)"进行详细报道,这种成矿体系是如何形成的?流体中CO_2、H_2S及贱金属元素对Au的运移和沉淀有何影响?此问题是认识中硫型金多金属矿床成矿机制的关键所在。(2)中硫化态矿物的矿物(黄铁矿、闪锌矿、方铅矿、黝铜矿、砷黝铜矿、黄铜矿等)的沉淀环境?与高硫化态、低硫化态矿物有何区别?(3)从成矿系统、成矿过程和矿物形成的复杂性来考虑,显然以闪锌矿中Fe S的含量多少作为区别IS型、HS型、LS型矿床的特征地化标志过于简单,且与已有关于闪锌矿的矿物学研究成果相矛盾,因此仍需进一步工作。(4)早期形成的作为赋矿围岩的火山岩地层或者次火山岩体是否提供了成矿物质?是否充当了浅成低温热液矿物沉淀的地球化学屏障?其具体过程是怎样的?以上问题的解决可辅助揭示IS型矿床的成因机制和形成过程,并为同类型矿床的勘查工作提供支持。  相似文献   

8.
http://www.sciencedirect.com/science/article/pii/S1674987114000711   总被引:1,自引:0,他引:1  
The West Junggar region,located in the loci of the Central Asian Orogenic Belt,is a highly endowed metallogenic province with >100 tonnes Au,>0.7 Mt Cu,>0.3 Mt Mo,and >2.3 Mt chromite as well as significant amounts of Be and U.The West Junggar region has three metallogenic belts distributed systematically from north to south:(1) late Paleozoic Saur Au-Cu belt;(2) early Paleozoic XiemisitaiSharburt Be-U-Cu-Zn belt;(3) late Paleozoic Barluk-Kelamay Au-Cu-Mo-Cr belt.These belts host a number of deposits belonging to at least eight economically important styles,including epithermal Au,granite-related Be-U,volcanogenic massive sulfide(VMS) Cu-Zn,podiform chromite,porphyry Cu,hydrothermal quartz vein Au,porphyry-greisen Mo(-W),and orogenic Au.These deposit styles are associated with the tectonics prevalent during their formation.Five tectonic-mineralized epochs can be recognized:(1) Ordovician subduction-related VMS Cu-Zn deposit;(2) Devonian ophiolite-related podiform chromite deposit;(3) early Carboniferous subduction-related epithermal Au and porphyry Cu deposits;(4) late Carboniferous subduction-related granite-related Be-U,porphyry Cu,and hydrothermal quartz vein Au deposits;and(5) late Carboniferous to early Permian subduction-related porphyry-greisen Mo(-W) and orogenic Au deposits.  相似文献   

9.
The Da Hinggan Mountains mineral province (DHMP), northeastern China, is divided into three tectonic units and corresponding metallogenic belts. The tectonic units of the Da Hinggan Mountains are the Erguna fold zone on the northwest, the Hercynian fold zone on the north, and the Hercynian fold zone on the south. The corresponding metallogenic belts are the Erguna Cu-Pb-Zn-Ag-Mo-Au belt of the NW DHMP, the Cu-Pb-Zn-Mo-Fe-Au belt of the northern DHMP, and the Pb-Zn-Ag-Cu-Sn-Fe-Mo belt of the southern DHMP. Distinct ore bodies, mostly associated with Mesozoic granites and volcanics, comprise (1) hydrothermal vein deposits including Pb-Zn-Ag-(Cu) and W‐Sn-Cu, (2) exhalative (Pb-Zn-Ag, Cu) deposits, (3) porphyry (Cu, Au, Mo), (4) skarn (Fe, Zn, Cu), and (5) epithermal Au-Ag deposits. The hydrothermal veins are hosted by a range of different rock types, whereas the exhalative ores are confined to Permian strata. The porphyry deposits occur within granite porphyries. The epithermal deposits are related to Mesozoic volcanic-subvolcanic rocks and occur within superjacent igneous structures. The first type, represented by the Bairendaba deposit, shows many characteristics of hydrothermal deposits. The second type occurs in a Permian clastic-chemical sedimentary sequence. Most Fe-Zn-Cu deposits related to granites and granodiorites are skarns. Granodiorite and granite-related deposits are typical porphyry ores, formed during Hercynian and Mesozoic time. Promising metallogenic conditions and the recent discovery of many large metal deposits indicate that this mineral province has a great exploration potential.  相似文献   

10.
在前人研究的基础上,通过系统的野外考察,论证了位于赣东北德兴地区德乐中生代火山盆地中的德兴铜矿、银山银铜铅锌矿和金山金矿及蛤蟆石金矿属于同一成矿系统。德兴铜矿是典型的斑岩铜矿,成矿流体和金属元素主要来自岩浆;银山银铜铅锌矿是一个下部为斑岩铜矿、上部为浅成低温热液型银铅锌矿,成矿流体早期以岩浆为主,晚期有较多的大气降水参与,成矿物质主要来自岩浆;金山和蛤蟆石金矿是远接触带热液矿床,成矿流体为岩浆热液与大气降水的混合产物,金主要来自围岩——双桥山群浅变质岩。这3套矿床以中酸性花岗斑岩或石英斑岩(高钾钙碱质花岗岩)为核心具有明显的分带性,自中心向外或深部向浅部为:斑岩铜金钼矿、浅成低温热液型银铅锌矿和远接触带热液型金矿。这种矿床组合关系不同于已知的经典斑岩铜矿模型和斑岩铜矿一浅成低温热液金银矿床模型,因而,有必要提出一个新的模型:斑岩铜矿一浅成低温热液银铅锌矿一远接触带热液金矿模型。这套矿『末形成于中侏罗世,抑或是古太平洋俯冲板片局部重熔或撕裂重熔的产物,抑或是在活动大陆边缘岩浆弧后伸展带由地幔底侵的结果。  相似文献   

11.
二十一站-宝兴沟( 铜) 金矿床( 点) 位于上黑龙江断陷盆地的东南部。区域地质背景及典型矿床研究表明,矿床不仅受NE 向断裂构造控制,还受其同期的岩浆岩控制。对宝兴沟金矿床的流体包裹体测试结果、矿床围岩蚀变和与火山穹窿构造间的关系等研究,表明宝兴沟金矿可能是中硫型浅成低温热液型矿床,二十一站和十五里桥( 铜) 金矿床可能是高硫型浅成低温热液型矿床( 点) 。区域地质特征、遥感解译、航磁异常及Au、Ag、Cu 化探异常分布特征显示了本区可能存在两种环境的斑岩型--浅成低温热液型成矿热液系统。在此基础上,结合铜元素化探异常和火山穹窿等特征,提出了在十五桥金矿床、二十一站铜金矿一带寻找斑岩型铜钼矿化类型,在NW、NNE 向构造带内找寻与浅成低温热液系统有关的矿床。  相似文献   

12.
加强埃达克岩研究,开创中国Cu、Au等找矿工作的新局面   总被引:36,自引:27,他引:36  
埃达克岩与浅成低温热液Au-Ag及斑岩型Cu、Cu-Au矿床有密切的关系,环太平洋地区多数大型和世界级的斑岩铜矿均与埃达克岩有关。埃达克岩有利于成矿的关键因素与埃达克岩形成时角闪石转变为石榴石的脱水作用有关,而水能萃取出在地幔和基性岩中富集的金属元素。因此,埃达克岩集中分布的地区有利于铜、金等矿化的聚集。中国铜矿资源严重不足,解决这个紧迫问题的出路在寻找斑岩铜矿。全球铜矿主要分布在环太平洋地区,中国与环太平洋类似的地区不是中国东部,而是古亚洲洋造山带、东北吉黑东部和西藏冈底斯。从国家目标出发,建议实施铜、金等找矿工作的战略转移,把浅成低温热液和斑岩型Au、Cu、Ag等矿床找矿的重点放在古生代的古亚洲洋造山带、晚古生代-中生代的吉黑东部和中-新生代的冈底斯地区。古亚洲洋造山带首选阿尔泰西南缘-东准噶尔、东天山和内蒙古中部3个地区。埃达克岩可以作为找矿标志来使用,因此,在找矿思路上也应当有一个变化,即:先找埃达克岩,再找矿。  相似文献   

13.
The spatial coexistence and synchronous formation of magmatogene porphyry Cu–Mo mineralization and epithermal gold mineralization are due to the genetic relationship between their formation processes. This relationship might be due to the generation of metal-bearing fluids of different geochemical compositions by the porphyry ore-magmatic system, which then participate in the formation of magmatogene porphyry Cu–Mo(Au) and associated epithermal gold deposits. Synthesis of fluid inclusions in quartz was performed for experimental study of the behavior of Cu, Mo, W, Sn, Au, As, Sb, Te, Ag, and Bi in heterophase fluids similar in composition and aggregate state to natural ore-forming fluids of porphyry Cu–Mo(Au) deposits. We have established that at 700 °C, a pressure decrease from 117 to 106 MPa leads to a significant enrichment of the gas phase of heterophase chloride fluid with Au, As, Sb, and Bi. The heterophase state of carbonate–chloride–sulfate fluids is observed at 600 °C and 100–90 MPa. It characterizes the highly concentrated liquid carbonate–sulfide phase–liquid chloride phase–low-density gas phase equilibrium. A decrease in the pressure of heterophase carbonate–chloride–sulfate fluid leads to a noticeable enrichment of its chloride phase with Cu, Mo, Fe, W, Ag, Sn, Sb, and Zn relative to the carbonate–sulfate phase. The processes of redistribution of ore elements between the phases of heterophase fluids can be considered a model of generation of metal-bearing chloride fluids, which occurs in nature during the formation of porphyry Cu–Mo(Au) deposits, as well as a model of generation of gas fluids supplying Au, Te, As, and other ore elements to the place of formation of epithermal Au–Cu and Au–Ag mineralization.© 2015, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.  相似文献   

14.
安徽铜陵狮子山矿田铜金多金属矿床的成矿模式   总被引:8,自引:3,他引:5  
狮子山矿田是铜陵矿集区最具代表性的铜金多金属矿田。本文选择狮子山矿田中的几个典型矿床进行地质和地球化学研究,系统阐述了矿床的控矿构造和赋矿岩石、矿体和矿石、蚀变和矿化等地质特征,确定了矿床成因类型;深入研究了侵入体与矿床矿体的时空关系以及主要矿床的流体包裹体地球化学特征及氢-氧、碳-氧、硫和铅同位素地球化学特征,探讨了成矿流体、成矿金属元素(铅)及其化合元素(碳和硫)的来源;结合成岩成矿大地构造背景分析,确定了不同矿床类型间的成因联系,建立了斑岩型-矽卡岩型-浅成热液型矿床成矿模式,为狮子山矿田边部和深部及铜陵矿集区及其邻区的找矿勘查提供了理论依据,并据此建议在铜陵矿集区以往以矽卡岩型矿床为主要找矿目标的基础上,进一步加强研究和寻找由统一的岩浆热液系统控制的斑岩型铜(-钼、-金)矿床和浅成热液型金(-银多金属)矿床。  相似文献   

15.
倪培  迟哲  潘君屹 《地学前缘》2020,27(2):60-78
斑岩型和浅成低温热液型矿床是全球铜、钼、金、银的主要来源之一,具有重要经济价值。这两类矿床之间通常存在紧密的时空关系,对其成矿流体性质和演化的解剖不仅有利于探究金属沉淀机制,也有助于揭示两者之间的内在成因联系。本文在综述国内外重要研究前沿基础上,以中国华南富家坞斑岩型铜钼(金)矿、桐村斑岩钼矿,以及邱村和安村浅成低温热液金矿为例,系统总结了斑岩型和浅成低温热液型矿床流体特征、演化规律和金属沉淀机制、探讨了从斑岩型到浅成低温热液型流体演化的“气相迁移”模型,并以福建紫金山铜金矿床为例,介绍了应用流体填图进行找矿预测的实例。  相似文献   

16.
孙豪  宋扬  李发桥  李子琛  王旭  李阳  郑明  方颖 《矿床地质》2023,42(2):287-309
西藏具有形成巨型斑岩铜成矿系统的地质背景。浅成低温热液型金矿常发育于斑岩铜成矿系统上部,极具经济价值,但由于形成深度较浅,易于剥蚀,目前西藏地区尚未发现独立的浅成低温热液型金矿床。多龙超大型铜金矿集区位于西藏班公湖-怒江成矿带西段,产出有大型-超大型斑岩-浅成低温热液型铜金矿床,而是否存在独立的浅成低温热液型金矿,既是重大科学问题,也是勘查的重点方向。文章运用超景深高分辨数码显微镜、扫描电镜及电子探针等手段,系统研究了多龙矿集区尕尔勤矿区内的残坡积物和外围水系沉积物中746颗砂金的大小、形貌、核部元素及不透明矿物包体特征,发现尕尔勤矿区内广泛分布的砂金不是表生环境下生物化学或化学成因金,而是尕尔勤产出的金矿(化)体剥蚀的产物。砂金普遍含有较高的w(Bi)、极低的w(Cu),部分含有高的w(Hg)、w(Te);砂金w(Ag)变化较大(0.05%~40.21%);金成色变化范围较大(588~999);砂金富含Bi-Pb-Te-S系列矿物包体等,显示尕尔勤矿区可能存在一个遭受过剥蚀的浅成低温热液金矿床。  相似文献   

17.
牟云 《吉林地质》2010,29(3):6-8
吉林东部地区与火山岩-斑岩有关的金(铜银)矿床可分为浅成低温热液型金(银)矿和浅成中温斑岩。热液型金(铜)矿两个亚类。浅成低温热液型矿床的特征矿物组合为黄铁矿、石英、方解石、冰长石和重晶石,成因上与高钾的钙碱性火山岩。斑岩(137~177Ma)有关,成矿流体属浅成低温氧化流体,在成矿过程中大气降水混入的程度大。浅成中温斑岩,热液型矿床的特征矿物组合为黄铁矿、黄铜矿、磁黄铁矿和石英,成因上与钙碱性火山岩。斑岩(130~140Ma)有关,成矿流体属浅成中温还原流体,在成矿过程中大气降水混入的程度相对较小。由于火山岩,斑岩的来源深度不同,斑岩体在矿床的形成中所起的作用不同,成矿流体的性质不同,造成金矿床的类型不尽相同。  相似文献   

18.
新疆东部金矿床类型、成矿特点及找矿方向   总被引:6,自引:2,他引:6  
据金矿类型划分标准,结合新疆东部金成矿特点,划分出韧性剪切带型金矿、浅成低温热液型金矿、岩浆热液型金矿、斑岩型金(铜)矿、硅化帽型金矿及变质岩型或绿片岩型银金矿6种成因类型,8种工业类型。通过研究,划分出以斑岩型金矿为主的大南湖-三岔口成矿带、以韧性剪切带型金矿为主的康古尔塔格-黄山成矿带、以浅成低温热液型金矿为主的马庄山-南金山成矿带、以绿片蚀变岩型银金、铅锌矿以及硅铁建造型金矿为主的玉西-铅炉子成矿带、以岩浆热液型金矿为主的金窝子-照壁山成矿带和依热达坂-红山成矿带、以韧性剪切带型和硅帽型金矿为主的头苏泉-塔林成矿带7个金矿成矿带,在此基础上确定该区区找矿主要类型和远景区。  相似文献   

19.
作为目前我国规模第一的冈底斯巨型铜多金属成矿带,其东段斑岩铜多金属找矿已取得历史性重大突破,发现了驱龙、甲玛等一系列大-超大型矿床。而西段由于复杂的构造背景、不便的交通条件、极低的地质研究和矿产工作程度,相对于东段具有不同的地壳结构和性质,不均一的地幔属性及壳幔作用方式,以及大面积的火山岩覆盖,使得冈底斯西段的成矿类型、找矿潜力等存在很大的不确定性和争议。在科学技术部、中国地质调查局等大力支持下,通过应用赵鹏大院士的“地质异常成矿预测理论”及开展的一系列技术方法创新、靶区优选与应用示范,在厘清区域成矿规律、发现新矿种、新类型、新矿床等方面均取得重大进展或突破,新发现了帮布勒铅锌银铜、拔隆银铅锌锡、打加错银铅锌、诺仓铅锌银钨、桑莫拉锡金等一批具有中-大型以上找矿前景的银锡金铜铅锌钨矿床,而且还发现冈底斯东、西段成矿存在极大差异:西段除了传统的斑岩型铜钼金、夕卡岩型铁铅锌铜(银)等矿床外,与陆相(次)火山岩有关的浅成低温热液型银锡(金)多金属矿床、特别是银锡或独立银矿床,是冈底斯西段最有找矿潜力的矿床类型(类似于东段的斑岩型),主要受古老基底、逆冲推覆构造、火山机构及次火山岩、晚古生代地体建造等的耦合控制。化探异常元素主要为Ag、Pb、Zn、Sn、Cu、Au、As、Sb、Mn等,其中高强度的Ag、Sn、Au是特征性异常元素,从而可以与单纯的夕卡岩型、岩浆热液型矿床相区别。这些矿床主要分布在冈底斯火山岩浆弧和弧背断隆带,与不同期次和成因的火山岩浆活动密切相关,据此划分出与晚三叠世弧岩浆作用有关的斑岩型铜金、与早白垩世弧岩浆作用有关的夕卡岩-浅成低温热液型铁银铅锌(锡)、与晚白垩世岩浆作用有关的夕卡岩型铁铜铅锌(银)、与古新世—始新世中酸性侵入岩有关的斑岩-夕卡岩型铁铜钼铅锌(银)、与古新世陆相(次)火山岩有关的浅成低温热液型银铅锌(锡金)、与中新世岩浆作用有关的斑岩-夕卡岩-浅成低温热液型铜钼金铅锌银6大成矿系列,明确了冈底斯西段的矿种、找矿类型及找矿方向,并客观评价了其资源潜力。根据成矿地质条件、已知矿床的分布以及找矿前景等要素,在冈底斯西段进一步划分出隆格尔铅锌铁铜、尼雄—日阿铁铜、朱诺—罗布真铜钼金、查个勒—诺仓银锡铅锌铜钼、热布喀银锡铅锌等5个矿集区,特别是朱诺—罗布真、查个勒—诺仓2个矿集区呈现出巨大的找矿前景,将会成为冈底斯西段最重要、最能取得重大突破的铜多金属、银锡多金属勘查基地,为该带进一步的找矿勘查工作部署提供了决策依据及目标。  相似文献   

20.
秦岭成矿带成矿特征和找矿方向   总被引:15,自引:10,他引:15  
秦岭成矿带是我国有色、贵金属工业的重要矿产资源基地,也是最具成矿潜力和找矿远景的地区之一。近年的综合研究工作表明,秦岭造山带是一个多旋回复合大陆碰撞造山带,自太古代以来经历了多种构造体制的转化和多期构造热事件发生,伴随有多个构造成矿旋回,所形成的含矿建造、成矿作用及矿床组合具有多样性。根据成矿时代、构造、建造、成矿作用及矿床组合特征分析,认为秦岭造山带铜、钼、铅、锌、银、金、汞、锑等内生金属矿床主要受7个主要的成矿系统控制,形成了18个主要成矿系列,并对各成矿系列及其典型矿床的地质特征和近几年找矿新发现进行了系统的论述,建立了铜、金、铅、锌、银等矿床系列的区域成矿模式。对区域优势矿种的成矿谱系研究表明,本区成矿在时间演化上表现出明显多旋回性、继承性、新生性和叠加性特征,华力西期与印支末-燕山期是成矿大爆发期,最有利于大型超大矿床形成;在空间分布上,具有明显的侧向和垂向分带性。在此基础上,对秦岭成矿带的成矿潜力及成矿远景区进行了评价和划分,指出秦岭地区热水喷流沉积型与密西西比型铅锌银矿床、微细浸染型与石英脉构造蚀变岩型金矿床、斑岩型钼钨铜矿床及低温热液型汞锑矿床等具有很大的找矿前景。并划分出5个区域成矿远景带和17个重要成矿预测区。  相似文献   

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