共查询到20条相似文献，搜索用时 492 毫秒
1.
2.
福建省金矿床成矿时代特点 总被引：4，自引：1，他引：4
福建是我国东南沿违法乱纪半区金矿产区之一，既是古特提期成矿域东缘的组成部分，又受中国东部中生代环太平洋成矿带成矿作用的强烈叠加，且与基底变质岩（前寒武系）关系密切。福建金矿床总体具有成矿物质主要来源于基底变质岩，后期岩浆液改造富集，与不同层次的剪切带有关，受区域构造控制等特点。其成矿时代特征则具有“一老一新两期（元古宙和中生代且以中生代为主）成矿”和“成矿物质来源老，矿床定位时代新”等特点，金矿床成矿时代普遍为中生代或与中生代岩浆活动关系密切。此外，福建与华南地区的金矿床在地质特征上具有比较多的一致性，而与华北和西北地区在成矿时代特点上存在一定的差异性。 相似文献
3.
中亚地区南天山大型金矿带的地质特征、成矿模型和勘查准则 总被引：14，自引：1，他引：14
概要介绍了中亚南天山大型金矿带的构造环境、地质特征和分布特点。中亚南天山是世界重要的金成矿带,其中发育有一系列世界级矿床。在该带中,除了剪切带型(造山型)金矿外,还有夕卡岩型、细网脉型以及爆破角砾岩型。成矿围岩是前寒武纪和早古生代浅变质岩系,成矿与二叠纪花岗质岩石密切相关,成矿流体以富CO2为特征,与矿化有关的围岩蚀变强烈发育,通常以Au,Ag,Sb,Te,As,W和Bi元素组合为地球化学找矿标志。 相似文献
4.
武当—桐柏—大别Mo- REE- Au- Ag- Pb- Zn多金属成矿带主要地质成矿特征及资源潜力分析 总被引：2，自引：0，他引：2
武当—桐柏—大别成矿带近期找矿成果显著,先后发现多个大型超大型矿床,具备成为国家级重要成矿带的条件,后经专家论证确定为全国重要成矿区带。该成矿带夹持于华北和扬子地块间,地层发育齐全,岩浆活动频繁,变质作用强烈,地质构造极其复杂,裂谷、区域隆起、深大断裂、剪切带等构造控矿特征突出,新元古代和燕山期两次岩浆作用成矿意义大,变质成矿作用强。矿床主要受矿源建造、燕山期中酸性岩浆侵入活动、岩相古地理、后生改造等因素制约,空间上有"北西西成带,北东东成行"和多矿种共生分布规律,时间上存在燕山等5个成矿高峰期。预期金、银、铜、铅、锌、钼等主攻矿种的找矿潜力巨大。在全国矿产资源潜力评价及找矿新突破基础上,在该区带内划分了四个重点远景区作为国家整装勘查区的后备选区。 相似文献
5.
辽宁省大地构造位置处于华北陆块北缘东段,省内金矿资源较为丰富.在研究典型金矿的基础上,总结了辽宁省金矿的成因类型、矿产预测类型以及金矿的时空分布规律.基于对辽宁省大地构造演化与金矿成矿关系的新认识,结合重大构造事件与金矿成矿效应的耦合关系,运用成矿系列理论揭示了省内金矿的成矿动力学演化机制,将全省金矿划分为3个成矿系列... 相似文献
6.
非造山带型金矿--胶东型金矿的陆内成矿作用 总被引：42，自引：2，他引：40
综合了全球有关金矿床的资料 ,Goldfarb和Groves等发表了著名的造山带金矿的论述 ,提出了与造山带有关的金矿在全球范围和从中太古代到整个显生宙的地质时期有广泛的分布和周期性。该类金矿的特点是与变形和变质的中地壳岩块共生 ,特别是在空间上与相应的地壳构造一致。金矿出现在造山带的不同构造部位 ,与不同的金属共生或伴生成矿。胶东作为一个重要的金矿矿集区 ,以不到中国领土面积的 0 .2 % ,而金矿产量占全国的 1 /4。国内一些地质学家也将胶东型金矿划归为造山带型金矿。最近的研究表明 ,胶东矿集区的东界与华北克拉通的东界吻合 ,金矿以华北克拉通变质岩及其有关的侵入岩为控矿围岩。主成矿期成矿时代为 (1 2 0± 1 0 )Ma ,约在不到 1 0Ma的短时限内。成矿物质具有多元性 ,既来自于控矿围岩———花岗片麻岩和变质岩 ,又来自于幔源的岩浆岩 ,特别是与中基性脉岩、偏碱的钙碱性花岗岩的侵入关系密切。除胶东金矿集区之外 ,华北克拉通的边缘和内部普遍含有金矿 ,而且金矿的物质来源、成矿方式、矿产类型、成矿围岩和成矿年龄都是一致的。这种大规模、短时限、高强度的成矿 ,被中国地质学家所重视并称为中生代成矿大爆发或金属异常巨量堆积。深部结构和成分的研究表明 ,华北东部的岩石圈在中生代急 相似文献
7.
CHEN Zhenghui SHENG Jifu LIU Lijun WANG Denghong LIANG Ting WANG Chenghui 《《地质学报》英文版》2015,89(3):1021-1035
China is rich in tin resources,and contains many types of tin deposits.Among the tin deposit types,the cassiterite-sulfide type,skarn type and quartz vein type occupy a large proportion of tin resources and reserves.From the aspect of exploitation and utilization,the most important types are cassiterite-sulfide type and quartz vein type.The cassiterite-sulfide type tin deposits are mainly located in Northern Guangxi and Eastern Yunnan,skarn type deposits are mainly distributed in the ore-concentration areas of South Hunan in Middle Nanling,and the quartz vein type tin deposits are mainly distributed in South China,such as Western Fujian,Middle Jiangxi,Northern Guangzhou and Southern Hunan.The most important metallogenic epoch for tin deposits is the Mesozoic era.The metallogenic geotectonic background is mainly continental environments after orogeny process,with strong tectonic changes,interlaced deep fracture and frequent magmatism.And the most distinctive feature is the well developed Mesozoic granites,which have a close relationship with tin mineralization.Based on the detailed study of the data from 873 tin deposits in China,this paper summarized the metallogenic regularity of tin deposits,classified 20 important metallogenic series of tin or tin-associated deposits,and inferred that the cassiterite-sulfide type,skarn type,quartz vein type and greisen type are the main prediction types of tin resources.Forty-four tin-mineralization belts were divided,among which,19 belts are the most important.In addition,a series of maps about tin metallogenic belts and tin metallogenic regularity were compiled,aiming to provide theoretical basis for potential estimation and prediction of tin mineral resources. 相似文献
8.
东南亚地区是地处特提斯成矿域、环太平洋成矿域交汇部位的全球重要成矿区带,其优势矿产资源铜、金、铁、镍、铬、铝、钾盐、锡、铅、锌等与我国矿产资源结构具有较强互补性;成矿类型多样,斑岩型铜金矿、中低温热液型金矿、矽卡岩型铁矿、热液-矽卡岩型钨锡矿、红土型铬镍矿、红土型铝土矿等非常发育,不少矿床为世界级矿床;成矿时代以中、新生代为主,矿产空间分布多成群成带,部分矿床聚集区为世界级巨型成矿带,岩浆岩成矿专属性特征明显。在上述特征分析的基础上,对10个具代表性的重要成矿带找矿潜力进行了概略性评价,结果显示该区仍具有较大的矿产勘查开发潜力。 相似文献
9.
试论中国东部中生代成矿大爆发 总被引：143，自引：22，他引：121
中国东部在中生代尤其是燕山期发生了大规模的金属成矿作用,形成了一批重要矿床,其成矿强度之高,密度之大,矿种之丰富,在全球中生代成圹作用中首屈一指,故可称为中生代成矿大爆发。研究表明,中国东部中生代成矿大爆发是该地区在特定地质背景下下发生岩石圈大减薄和构造格局大转折相结合,从而导致大规模壳幔相互作用和构造圈热侵蚀事件的产物。深入研究中国东部中生代成矿大爆发的背景和过程,不仅能解决矿床学学院发展中的许 相似文献
10.
Located in the southeastern margin of the Yangtze Block and generally interpreted as the Neoproterozoic collisional product of the Yangtze with the Cathaysia Blocks of South China, the Jiangnan Orogenic Belt (JOB) contains a number of gold (Au) (-polymetallic) ore deposits and mineral showings, mostly hosted by Neoproterozoic low-grade metamorphic volcaniclastic and sedimentary rocks. The mineralization styles mainly include auriferous quartz veins and disseminated mineralization in altered mylonite and cataclasite that are developed along shear zones, fracture zones and inter- or intra-formational fault zones closely related to regional folding and shearing deformation. Three gold mineralizing epochs are recognized in the JOB. The ca. 423–397 Ma mineralization was associated with the early Paleozoic tectonothermal event(s), which induced widespread emplacement of Silurian S-type granites, low-grade metamorphism and enrichment of gold in the Neoproterozoic rocks (i.e., forming Au source beds). The second Au mineralization epoch, occurring at ca. 176–170 Ma (Jurassic), was related to the subduction of the Paleo-Pacific plate beneath the South China continental margin. The third and most important Au mineralization epoch took place at ca. 144–130 Ma (early Cretaceous), when a Basin-and-Range tectonic pattern was developed, characterized by NE–NNE-trending strike-slip faults, granitic domes and metamorphic core complexes (MCC), and basins filled with red bed lithologies. C, H, O, He-Ar, S and Pb isotopic and fluid-inclusion data suggest that the ore fluids were predominantly metamorphic and/or magmatic, with variable input of mantle-derived fluids and the progressive involvement of meteoric waters in the later stages of mineralization. Ore materials were mostly contributed by the Neoproterozoic source beds, plus a possible contribution from mantle- or magma-derived components. The Au (-polymetallic) deposits in the JOB, particularly those formed in the early Cretaceous, share many geological and geochemical features with the orogenic-type and Carlin-type deposits. In the context of tectonic evolution of South China, the gold mineralization in the JOB may be considered an “intracontinental reactivation type”, characterized by synchronous development of Au–polymetallic mineralization, reactivation of stuctures developed in Neoproterozoic metamorphic rocks, and widespread granite emplacement in the late Mesozoic. 相似文献
11.
胶东中生代金成矿系统 总被引：74，自引：50，他引：24
胶东是我国最重要的金矿集区,其内已发现金矿床150余处,探明金资源储量4000余吨。虽然其金矿床数量众多、资源储量巨大、分布地域广泛、产出空间各异、矿化类型多样,但它们的成矿地球动力学背景、赋矿围岩环境与产出条件及其成矿作用特征总体一致:(1)胶东是一个主要由前寒武纪基底岩石和超高压变质岩块组成、中生代构造-岩浆作用发育的内生热液金矿集区,约130~110Ma的金成矿事件比区域变质作用晚约2000Myr;(2)区域金成矿系统形成于早白垩世的陆缘伸展构造背景,大规模金成矿事件发生在区域NW向伸展转换为NE向伸展后的NEE向挤压变形作用过程中,对应于中国东部岩石圈大规模减薄、华北克拉通破坏和大陆裂谷作用的高峰;(3)金矿床群聚于NNE向玲珑、鹊山和昆嵛山变质核杂岩周边,主要沿前寒武纪变质岩与中生代花岗岩体接触带形成的区域NE-NNE向拆离断层带分布;(4)控矿断裂带经历了早期的韧-脆性变形和晚期的脆性变形构造叠加,在三维空间上呈舒缓波状延展,控制了金矿体的侧伏和分段富集;(5)矿化样式以破碎带蚀变(砾)岩型、(硫化物-)石英脉型和复合脉带型为主,矿石普遍发育压碎、晶粒状和填隙结构,浸染状、细脉浸染状、网脉状、脉状、团块状和块状构造,反映其形成于韧-脆性→脆性变形环境;(6)矿石中金属矿物以黄铁矿、黄铜矿、方铅矿和闪锌矿为主,非金属矿物以石英、绢云母、钾长石、斜长石和方解石为主;金矿物以银金矿和自然金为主、含少量金银矿,主要以可见金的形式赋存于黄铁矿和石英裂隙中、含少量晶隙金和包体金;热液蚀变主要为黄铁矿化、硅化、钾长石化、绢云母化和碳酸盐化;成矿元素为Au-Ag(-Cu-Pb-Zn);呈现出中-低温蚀变矿化组合特征;(7)成矿流体为壳-幔混合来源,以壳源变质流体为主;成矿物质总体来源于中生代活化再造的前寒武纪变质基底岩石,并混入了少量浅部地壳和地幔组分。这种区域成矿特征的一致性,表明胶东金矿集区早白垩世大规模金成矿作用受控于统一的地质事件,属于后生的中-低温热液脉金成矿系统。这些金矿床具有明显的时空群聚分布特征,主要沿三个变质核杂岩周边的岩相接触带产出,且自西向东,金成矿作用年龄由老变新。据此,可划分为胶北隆起蚀变岩-石英脉型、苏鲁超高压变质带硫化物-石英脉型和胶莱盆地北缘蚀变砾岩型三个金成矿子系统。其矿化样式由浸染-细脉、细脉-网脉型和石英脉型→硫化物-石英脉型→蚀变(角)砾岩型变化,矿石结构、构造以细脉浸染状构造为主→环带结构与梳状构造→角砾状构造为特色,反映其成矿作用分别发生于脆-韧性转换带(约15km)→脆性张剪性断裂带→脆性角砾岩带(约5km)环境;矿化、蚀变规模和强度逐渐减弱,成矿物质中浅部壳源组分逐渐增多,可能与其矿床定位空间越来越远离源区有关;成矿温度和压力依次降低、成矿流体中大气降水和/或盆地卤水贡献逐渐增大,与其成矿深度越来越浅、成矿构造环境越来越偏张性的变化趋势一致。这种成矿特征的区域规律性变化反映至少在拆离断层韧-脆性转换带附近→脆性角砾岩带之间的地壳剖面中、在不同的垂向深度上连续成矿。胶东中生代金成矿系统的上述特征明显区别于典型的"与侵入岩有关的金矿"和"造山型金矿",也不同于全球其它已知的金矿床类型,不能被已有成矿模式所涵盖。为合理解释胶东中生代金成矿系统独特的地质与成矿特征,我们提出新的"胶东型金矿"成矿模式,指出古太平洋Izanagi俯冲板片的回转作用可能是引起区域前寒武纪变质基底岩石中成矿物质大规模活化再造的主要驱动机制,成矿流体主体来源于俯冲板片变质脱水,金可能主要以Au(HS)2-络合物的形式在流体中沿拆离断层系输运,在韧-脆性转换带附近→脆性角砾岩带,由于构造空间急剧增大、成矿流体的温度和压力突然降低,CO2、H2S逸出和硫化作用导致Au(HS)2-等金络合物失稳分解,金大规模沉淀富集成矿。 相似文献
12.
巽他群岛大地构造位置位于欧亚板块、印度-澳大利亚板块与太平洋板块结合的部位,板块间长期的相互作用引发多期次构造-岩浆事件,在这一地区形成了丰富的矿产资源。根据矿床产出的大地构造背景、矿产种类、矿床类型、矿床规模、矿床组合等,将巽他群岛划分为苏门达腊-爪哇成矿带、苏拉威西成矿带、东加里曼丹成矿带、南西加里曼丹成矿带、古晋成矿带、帝汶岛成矿带,并对各成矿带的矿产概况、地质背景及某些典型矿床地质特征进行了总结,认为在六大成矿带中,苏门达腊-爪哇成矿带和苏拉威西成矿带研究程度最高、发现矿床最多、最具找矿前景。 相似文献
13.
中国东北部陆缘内生金矿床成因类型、成矿时代及地球动力学背景 总被引：2，自引：0，他引：2
中国东北部陆缘是我国内生金矿床较为发育的地区之一,以成矿作用复杂、蕴藏丰富的金资源量倍受国内外地质学家关注。通过对该区内生金矿的地质和成矿年代的系统研究,初步将该区内生金矿床划分为中温热液金矿床、接触交代-热液金矿床、斑岩型/类斑岩型金铜矿床和浅成低温热液金矿床4种主要成因类型和3个重要成矿期（170～160 Ma、130～110 Ma和110～90 Ma）。结合同位素地球化学特征,进一步确定中温热液金矿床的成矿物质主要来自下地壳源,成矿作用与中生代燕山早期古太平洋板块俯冲作用引发的中国东部大陆边缘岩石圈减薄及拆沉的动力学过程密切相关;接触交代-热液金矿床的成矿物质来源于年轻地壳,成矿作用与古太平洋板块俯冲引起的岩石圈减薄拆沉的伸展构造背景下的岩浆接触交代作用更为密切;而斑岩型/类斑岩型金铜矿床和浅成低温热液金矿床的成矿物质来源为壳幔混合源,其成矿发生在古太平洋板块向亚洲大陆正北向俯冲转入Izanagi Farallon板块西向俯冲的构造转换期。 相似文献
14.
辽东-吉南Fe- 菱镁矿 Cu-Au成矿带主要地质成矿特征及潜力分析 总被引：1，自引：0，他引：1
辽东-吉南成矿带是2008年确定的首批16个重要成矿带之一,随着新的找矿进展和预测成果不断涌现,需要对其开展新一轮研究总结。本文以新的研究成果和找矿突破为基础,通过综合分析,将其命名为"辽东-吉南Fe-菱镁矿-Cu-Au成矿带"并对其开展成矿作用类型及勘查部署综合研究。该区带范围与III级成矿带辽东(隆起)Fe-Cu-Pb-Zn-Au-U-硼-菱镁矿-滑石-石墨-金刚石成矿带一致,结合区域成矿地质背景、成矿作用类型及典型矿床的综合研究,初步建立了辽东-吉南Fe-菱镁矿-Cu-Au成矿带成矿谱系,并将其主要成矿期归纳为三期:新太古代、古元古代和中生代燕山期;在典型矿床成矿地质特征及潜力评价综合分析的基础上,总结了研究区主要成矿类型为沉积变质型铁-菱镁矿、火山沉积-变质改造型铜锌矿、沉积变质-叠加改造型铅锌矿、岩浆型铜镍硫化物矿、岩浆热液型金矿以及造山带型金矿。结合区域找矿进展和潜力评价最新成果,认为本区Fe、菱镁矿、Cu、Au潜力巨大,为下一步勘查部署的主攻矿种,同时在本区划分了12个远景区,其中10个为重点远景区,2个为远景调查区,对研究区下一步矿产勘查部署工作有一定指导意义。 相似文献
15.
16.
《International Geology Review》2012,54(3):287-310
The continental margin of Northeast China, an important part of the continental margin-related West Pacific metallogenic belt, hosts numerous types of gold-dominated mineral deposits. Based on ore deposit geology and isotopic dating, we have classified hydrothermal gold–copper ore deposits in this region into four distinct types: (1) gold-rich porphyry copper deposits, (2) gold-rich porphyry-like copper deposits, (3) medium-sulphidation epithermal copper–gold deposits, and (4) high-sulphidation epithermal gold deposits. These ore deposits formed during four distinct metallogenic stages or periods, at 123.6 ± 2.5 Ma, 110–104 Ma, 104–102 Ma, and 95.0 ± 2 Ma, corresponding to periods of Cretaceous intermediate–acid volcanism and late-stage emplacement of hypabyssal magmas along the northern margin of the North China platform. The earliest stage of mineralization (123.6 ± 2.5 Ma) corresponds to the formation of medium-sulphidation epithermal copper – gold deposits and was associated with a continental margin magmatic arc system linked to subduction of the Pacific Plate beneath the Eurasia. This metallogenesis is closely related to high-K calc-alkaline intermediate–acid granite and pyroxene – diorite porphyry magmatism. The second and third stages of mineralization in the study area (110–104 Ma and 104–102 Ma, respectively) correspond to the formation of gold-rich porphyry copper, porphyry-like copper, and high-sulphidation gold deposits, with metallogenesis closely related to sodic or adakitic magmatism. These magmas formed in a continental margin magmatic arc system related to oblique subduction of the Pacific Plate beneath the Eurasia, as well as mixing of crust-derived remelted granitic and mantle-derived adakitic magmas. During the final stage of mineralization (95.0 ± 2 Ma), metallogenesis was closely related to sodic or adakitic magmatism, with diagenesis and metallogenesis related to the disintegration or destruction of the Pacific Plate, which was subducted beneath the Eurasian Plate during the Mesozoic. 相似文献
17.
18.
SHENG Jifu LIU Lijun WANG Denghong CHEN Zhenghui YING Lijuan HUANG Fan WANG Jiahuan ZENG Le 《《地质学报》英文版》2015,89(4):1359-1374
Tungsten ore resources are abundant in China with relatively complete types of deposits. Skarn type and quartz vein type deposits are dominated in the tungsten resources, whereas quartz vein type wolframite deposits are most important in terms of exploitation and utilization. Skarn type tungsten deposits are concentratedly distributed in the central Nanling region, such as South Hunan, South Anhui and the eastern Qinling region, while quartz vein type tungsten deposits occur mainly in South China, such as West Fujian, South Jiangxi, North Guangdong and South Hunan. The most important metallogenic epoch of tungsten is the Mesozoic, while the metallogenic tectonic setting is featured by an intracontinental environment after orogeny with sever tectonic movements, deep-seated faults and frequent magmatic activities, especially Mesozoic granitoids closely related to tungsten-tin mineralization. 22 metallogenic series of ore deposits characterized by or significantly related to tungsten were defined based on precise statistic information of 1199 tungsten mining areas and thorough the summary of metallogenic regularities. Based on studies of the metallogenic regularity of tungsten deposits, skarn type (or greisen type), quartz vein type and massif-type of tungsten deposits are thought to be the key prediction types. 65 tungsten-forming belts and 22 key ore concentration areas were ascertained and a distribution map of tungsten-forming belts of China was compiled, which provided a theoretical basis for evaluation and prediction of potential tungsten resources. 相似文献
19.
《China Geology》2021,4(1):1-16
Many large and super-large copper deposits have been discovered and explored in the Tibet Plateau, which makes it the most important copper resource reserve and development base in China. Based on the work of the research team, the paper summarizes the geological characteristics of the main copper deposits in Tibet and puts forward a further prospecting direction. A series of large accumulated metal deposits or ore districts from subduction of Tethys oceanic crust to India-Asia collisionhave been discovered, such as Duolong Cu (Au) ore district and Jiama copper polymetallic deposit. The ore deposits in the Duolong ore district are located in the lowstand domain, the top of lowstand domain, and the highstand domain of the same magmatic-hydrothermal metallogenic system, and their relative positions are the indicators for related deposits in the Bangong Co-Nujiang metallogenic belt. The polycentric metallogenic model of the Jiama copper polymetallic deposit is an important inspiration for the exploration of the porphyry mineralization related to collision orogeny. Further mineral exploration in the Tibet Plateau should be focused on the continental volcanic rocks related to porphyry-epithermal deposits, orogenic gold deposits, hydrothermal Pb-Zn deposits related to nappe structures, skarn Cu (Au) and polymetallic deposits, and the Miocene W-Sn polymetallic deposits.©2021 China Geology Editorial Office. 相似文献
20.
北太行山—燕山区中生代金属矿床成矿系统 总被引：5，自引：1，他引：4
太行山北段—燕山地区位于中朝板块中部及其北部边缘,以铁、铜、钼、金、银、铅、锌、铀等金属矿产为特色。中生代本区进入陆内造山作用阶段,花岗质岩浆作用及与之有关的成矿作用是克拉通活化的结果。在已研究了与花岗质岩浆作用有关的成矿系列划分、特征和控制因素等基础上,本文重点探讨了成矿系统的划分、时空结构及其控制因素,指出其作为中生代陆内造山作用的结果,明显受到两期不同成矿动力机制的控制,主要由古欧亚构造域成矿系统和西太平洋构造域成矿系统组成。根据构造应力环境,可进一步划分出５个成矿亚系统和Ⅰ～Ⅳ４个成矿系列。成矿系列或矿床具有多期性,不同时代矿床空间分布成带或集中区,三叠纪矿床主要分布于燕辽沉降带北侧,早侏罗世时以辽西为主,中侏罗世时向西扩展到冀东,晚侏罗世时则以太行—燕山西段为主,早白垩世矿床广泛分布于全区,但Ⅲ成矿系列集中等间距分布在几条ＮＷ向带中。矿床这种时空分布规律受控于中生代花岗岩类岩浆活动,而中生代造山作用决定了岩浆岩的时空分布,岩浆起源演化与成矿有关。 相似文献