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藏南特提斯喜马拉雅前陆断褶带新生代构造演化与锑金多金属成矿作用 总被引：9，自引：1，他引：8
特提斯喜马拉雅前陆断褶带由近东西向展布的藏南拆离系主拆离带和洛扎、绒布-哲古两条断裂带及一系列倒转复式褶皱组成,是始喜马拉雅期印度板块与欧亚大陆发生大规模陆-陆碰撞,导致特提斯喜马拉雅前陆盆地发生大规模缩短、沉积盖层以藏南拆离系为底界自北向南大规模逆冲推覆、褶皱,以及新喜马拉雅期高喜马拉雅结晶岩系自北向南挤出导致藏南拆离系主拆离带和洛扎、哲古两条次级构造带上盘地层自南向北伸展的产物.特提斯喜马拉雅前陆断褶带内的锑金多金属矿床在空间上具有明显的分带性,自北向南依次构成沙拉岗-查拉普锑金成矿带、错美-隆子锑铅锌多金属成矿带和拉康-错那银铅锌成矿带,其间分别以绒布-哲古和洛扎两个次级断裂带为界.矿体主要受褶皱翼部近东西向层间破碎带和近南北向构造带控制,成矿类型为浅成低温热液型,成矿时代为新喜马拉雅期.成矿作用与新生代构造演化和新喜马拉雅期岩浆活动关系密切.在新喜马拉雅期高喜马拉雅结晶岩系向南挤出过程中,特提斯喜马拉雅前陆断褶带沿着始喜马拉雅期形成的逆冲推覆构造带发生自南向北伸展,诱发地壳部分熔融,形成的岩浆沿构造带侵位,并促使沿构造带下渗地下水循环对流.当这些循环的地下水与沿构造带上升的岩浆期后含矿热液混合时,成矿流体的物理化学条件发生改变,成矿物质沉淀形成沿褶皱翼部近东西向层间破碎带和近南北向构造带分布的似层状、脉状和透镜状锑金多金属矿床. 相似文献
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甘肃北山南带西段金成矿带控矿因素及成矿预测 总被引：1，自引：0，他引：1
概述了北山南带西段金矿的成矿环境和控制因素,讨论了矿床的成矿时代和空间分布规律.区内金成矿主要受地层岩性、岩体和构造控制.奥陶系、石炭系和二叠系富金的火山-沉积岩为金矿的矿源层,晚加里东—海西期花岗岩侵入体与金矿密切相关,深断裂和区域性大断裂控制了矿带部位.这些矿带由一系列不同成因和类型的金矿床组成,金矿床是在矿源层、矿源岩的基础上,经过海西期构造-岩浆活动的改造和富集而形成.依据找矿信息及化探异常、重砂异常的分布范围,归纳出16处具有较大金资源潜力的找矿远景区. 相似文献
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甘南西部金矿床成矿地质特征 总被引：3，自引：0，他引：3
甘南西部中间地带是三叠纪秦岭海槽褶皱回返的碌曲一卓尼（印支）断褶带,其南、北两侧是同熔型岩浆活动带,也是该区的两条金成矿带。依据成矿主要矿质来源和产出地质特征,区内金矿床可划分为岩浆热液型、构造蚀变岩型和卡林型等3种矿化类型,并按赋矿主岩进一步分为九个亚类。通过揭示区域金矿化地质特征和南、北带金成矿构造地质条件的对比分析,阐明了甘南百部的金成矿基本规律和找矿方向。 相似文献
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通过对北山南带西段金矿的成矿环境和控制因素的分析,讨论了矿床的成矿时代和空间分布规律。区内金成矿主要受地层岩性、岩体和构造控制。奥陶系、石炭系和二叠系富金的火山—沉积岩为金矿的矿源层,晚加里东—海西期花岗岩侵入体与金矿密切相关,深断裂和区域性大断裂控制了矿带部位。这些矿带由一系列不同成因和不同类型的金矿床组成,金矿床是在矿源层、矿源岩的基础上,经过海西期构造—岩浆活动的改造和富集而形成。依据找矿信息及化探异常、重砂异常的分布范围,提出16处具有较大金资源潜力的找矿远景区。 相似文献
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滇中龙岗地区多金属矿带成矿地质特征及找矿方向 总被引：2，自引：0，他引：2
文章总结了滇中龙岗地区金、铜、铁、铅-锌、银等多金属矿床的类型和成矿规律,指出该区成矿演化有4个时期:早元古代铁-铜成矿期,中元古代-中三叠世古风化壳铁(金)矿成矿期,燕山期-早喜马拉雅期金、铅-锌(银)成矿期,晚喜马拉雅期金成矿期;相应地在空间上自下而上形成了4种成因类型的矿床组合:海相火山喷发-沉积-变质铁-铜矿床,古风化壳型铁(金)矿床,构造破碎带热液蚀变脉状金矿床和铅-锌(银)矿床,沉积-热液改造砂砾岩型金矿床。文章指出了该区找矿主攻矿种和有利找矿地段。 相似文献
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赛什腾金矿位于青海省海西州冷湖镇,是复合内生石英脉型金矿床。赛什腾金矿赋存于加里东期石英脉及其接触带和剪切蚀变带中,具有石英脉集中发育、矿化集中、金含量高、水系异常套合好的特征。处在同一构造单元(柴达木北缘结合带)和同一成矿亚带(赛什腾山-阿尔茨托山同-成矿亚带)中的滩涧山蚀变岩型金矿、野骆驼泉构造蚀变岩型-石英脉型金矿床、红柳沟石英脉型金矿床和赛什腾复合内生石英脉型金矿在不同成矿时代、不同位置形成不同类型的金矿床。通过对比研究该地区金矿床的特征,对总结成矿规律和综合找矿具有重要的现实指导意义。 相似文献
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新疆东准噶尔地区金矿床矿石矿物的直接定年研究比较缺乏.顿巴斯套金矿床位于该地区阿尔曼泰构造带东段北东侧,为该构造带中规模最大的金矿床.应用Rb-Sr同位素定年方法对该矿床9件黄铁矿样品进行了成矿时代测定,获得等时线年龄为268±3 Ma（MSWD=0.7）,该年龄与矿区西北部高钾钙碱性花岗岩成岩时代一致,成矿与中二叠世构造岩浆活动具有密切关系.同时结合近些年来金矿床成岩成矿年代学研究成果,认为中二叠世（270~260 Ma）为东准噶尔地区一个重要的金成矿时限.黄铁矿Rb-Sr年龄的厘定,显示顿巴斯套金矿床为中二叠世东准噶尔地区后碰撞伸展背景下构造-岩浆-流体活动的产物,也为东准噶尔金矿床成矿作用对比和找矿实践提供了参考. 相似文献
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《地质通报》2019,(Z1)
邦卓玛金矿是藏南冈底斯-喜马拉雅金锑多金属成矿带最具找矿潜力的矿床之一,分析和研究邦卓玛地区金矿床成因、成矿模式对于确定该区成矿类型及进一步找矿具有重要的指导和借鉴意义。收集邦卓玛地区金矿床成矿大地构造背景、区域地层、构造、岩浆岩等方面的资料,对该区的地层和岩浆岩地球化学特征与含矿性进行了分析。研究表明,邦卓玛金矿床以上三叠统涅如组为容矿地层和初始矿源,早白垩世中基性侵入岩和古近纪、新近纪的酸性侵入岩体提供热能、动能和部分成矿物质。其次,从地层、岩浆岩、构造、氢氧硫铅同位素等方面对控矿因素和矿床成因进行分析,初步圈定了5个金矿体,揭示了成矿物质和成矿流体来源。综合分析认为,该矿床属浅成低温热液型矿床。在上述基础上,初步建立了该矿床的成矿模式和综合找矿模型。 相似文献
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WANG Denghong MAO Jingwen YAN Shenghao YANG Jianmin XU Jue CHEN Yuchuan XUE Chunji Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing Chinese Academy of Geological Sciences Beijing Department of Geological Sciences Chang''an University Xi''an Shaanxi 《《地质学报》英文版》2005,79(2):233-253
A lot of new gold deposits have been found on the eastern margin of the Qinghai-Tibet Plateau during the past two decades. Among them, three main types of gold deposits have been recognized, including quartz-vein-type, shearzone-type and porphyry-type. The former two types of gold deposits are mainly hosted within metamorphic rocks, while the latter is related to Cenozoic magmatism. Although all of these gold deposits are believed to have been formed during the uplift process of the Qinghai-Tibet Plateau in the Cenozoic era (Wang et al., 2002b), precise isotopic age constraints have still been lacking until quite recently. This paper presents new ^40Ar/^39Ar data of some gold deposits on the eastern margin of the Qinghai-Tibet Plateau, which indicate that gold mineralization in the region occurred in response to the episodic stages of the orogenies. Recently obtained ^40Ar/^39Ar data on quartz and feldspars from several gold deposits, such as the Sandiao deposit, the Baijintaizi deposit, the Pusagang deposits, provide new constraints on gold mineralization on the eastern margin of the Qinghai-Tibet Plateau. Geochronological studies of gold deposits along the Daduhe River indicate that there are three stages of gold mineralization. The early two stages occurred as early as 65.1 Ma in the Shuibaiyang deposit and 58.95 Ma in the Ruoji deposit, while the latter stage occurred as late as 25.35 Ma in Baijintaizi and 24.70 Ma in Sandiao. Isotopic dating of three plagioclases from the Beiya deposit, Zhifanggou deposit and Luobodi deposit and a K-feldspar from the Jinchangqing deposit in Yunnan Province indicates that these deposits were formed at two stages. The Zhifanggou and Jinchangqing deposits have early stage records as old as 58.82 Ma in Zhifanggou and 55.49 Ma in Jinchangqing, but all of the above four deposits in Yunnan have late stage records of 23.18 Ma in Jinchangqing, 24.54 Ma in Zhifanggou, 24.60 Ma in Luobodi and 24.56 Ma in Hongnitang. The above results suggest that the gold deposits on the eastern margin of the Qinghai-Tibet Plateau were formed concentratedly at two main episodes, i.e. the end of the Paleocene (about 58 Ma) and the boundary between the Paleogene and the Neogene (about 25 Ma). The later episode appears to be looks like more important and was coupled with the Sichuan movement, which was extensively activated at that period. The beginning of the Cenozoic Era (about 65 Ma) might be another episode of gold mineralization, but only one deposit (Shuibaiyang) in this study has been proved to have been be formed at this stage and might be earlier than the initial collision between the Indian Plate and the Eurasia Plate. In view of geology, the above three episodes of gold mineralization are associated with three events of tectonicmagmatism and/or fluid events. Even though the gold deposits (for example, the Shuibaiyang deposit, Ruoji deposit and Pusagang deposit) were formed at different episodes, all of them are genetically related to tectonic movements in largescale shear zones. It looks like theat tectonic events (including large-scale strike-slip) between Paleogene and Neogene had a wide influence upon gold mineralization, with new deposits formed and old deposits enriched or superimposed to be a higher grade by new stage of mineralization. The above data suggest that gold deposits were not only concentrated in some areas, but also formed mainly at different boundaries of geological times, indicating that there existed some peak stages of gold mineralization (metallogenic episodes), and that the gold deposits were formed mainly by episodic mineralization. 相似文献
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羊坪湾金矿床是在南秦岭造山带石泉-汉阴北部地区继黄龙金矿床和鹿鸣金矿床开发之后近年来新发现的金矿床,对该金矿床的研究对于该区域找矿实践及金成矿理论研究具有重要意义.笔者通过野外调研和室内测试相结合对羊坪湾金矿床地质、地球化学特征及金的富集规律进行了研究.羊坪湾金矿产于下志留统梅子垭组(S1m)含炭二云母石英片岩中,目前矿区圈出南、北两条平行展布的金矿化蚀变带,在矿带内圈出3条平行展布的金矿体.金矿化特征为硅化、黄铁矿化.金粒度较粗,主要为明金,以粒间金、裂隙金等形式赋存.含炭二云母石英片岩夹石英岩互层有利岩性段和韧(脆)性剪切构造控制着金矿的产出.流体包裹体研究表明:均一温度为170～220℃,属中-低温;氢、氧同位素的特征显示,成矿热液中的水介质是以大气降水和变质分泌水为主的混合水.硫同位素的变化范围是7.5‰～11.7‰,说明成矿物质主要来源于地层.综合地质地球化学特征认为该矿床为沉积-改造型中低温热液矿床. 相似文献
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Re-Os Dating of the Pulang Porphyry Copper Deposit in Zhongdian,NW Yunnan, and Its Geological Significance 总被引：1，自引：0，他引：1
ZENG Pusheng HOU Zengqian WANG Haiping QU Wenjun MENG Yifeng YANG Zhusen LI Wenchang Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing National Research Center of Geoanalysis Chinese Academy of Geological Sciences Beijing Yunnan Institute of Geological Survey Kunming Yunnan 《《地质学报》英文版》2004,78(2):604-609
The Pulang porphyry copper deposit is located in the Zhongdian island arc belt, NW Yunnan, in the central part of the Sanjiang area, SW China, belonging to the southern segment of the Yidun island arc belt on the western margin of the Yangtze Platform. In the Yidun island arc, there occur well-known "Gacun-style" massive sulfide deposits in the northern segment and plenty of porphyry copper deposits in the southern segment, of which the Pulang porphyry copper deposit is one of the representatives. Like the Yulong porphyry copper deposit, this porphyry copper deposit is also one of the most important porphyry copper deposits in the eastern Qinghai-Tibet Plateau. But it is different from other porphyry copper deposits in the eastern Qinghai-Tibet Plateau (e.g. those in the Gangdise porphyry copper belt and Yulong porphyry copper belt) in that it formed in the Indosinian period, while others in the Himalayan period. Because of its particularity among the porphyry copper deposits of China, this porphyry copp 相似文献
14.
新疆西天山新发现新源县卡特巴阿苏大型金铜矿床 总被引：4，自引：1，他引：3
乌兹别克斯坦-吉尔吉斯斯坦中天山不乏世界级金铜矿床,新疆西部中天山及其南北缘是值得高度关注的金铜找矿方向。最近,新疆地质矿产勘查开发局第一区域地质调查大队在新疆西天山新发现新源县卡特巴阿苏大型金铜矿床。矿床位于新源县城南东直线距离30km处,产在新疆西部中天山北缘,矿体主体形成于石炭纪二长花岗岩热液蚀变体内,呈板状和透镜状,长度几米到几千米,厚度几米到几十米,上部以金矿体为主,下部铜矿体增多。矿石中黄铁矿和黄铜矿可能是主要的载金矿物,矿石平均品位金 3.84g/t、铜 0.65%。金铜成矿作用受控于二长花岗岩等岩体侵入期后热液蚀变过程。矿床的发现具有重要的经济价值,同时证实新疆西部中天山及其南北缘具备金、铜矿的巨大潜力;是地质调查先行、引导商业勘探、实现找矿突破的典范。 相似文献
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豫西栾灵金矿床地处熊耳山金多金属矿集区南部马超营断裂带北侧,金矿体产于构造破碎带中,呈钾长石石英脉体和蚀变岩产出,为本区一种新的金矿化类型。文章为厘定栾灵金矿床的成矿时代,采用辉钼矿Re-Os同位素定年方法,测得栾灵金矿6件辉钼矿样品的Re-Os同位素模式年龄为(161±3)Ma~(164±2)Ma,加权平均年龄(163±1)Ma(MSWD=0.68),等时线年龄(163±2)Ma(MSWD=1.5),表明栾灵金矿床形成于晚侏罗世早期。与祁雨沟、前河金矿等早白垩世(125 Ma)金矿相比,栾灵金矿的成矿作用早约38 Ma。这些年龄数据表明,该矿床在区域上可能与南泥湖-三道庄、上房沟钼矿等形成于同一成矿系统,它的发现为在熊耳山地区寻找相似成矿地质条件的金、钼矿床提供了依据。 相似文献
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为深入研究甘肃南祁连党河南山北坡金铜矿产的成矿规律和控矿因素，笔者采用地质地球化学方法首次对区内黑刺沟和贾公台两个金矿床进行了较为系统的研究，发现它们的成矿特征有很大差异：黑刺沟金矿床以富As，Sb的微细浸染蚀变岩型金矿化为主，其次为辉锑矿石英脉型金矿化；而贾公台金矿床则以少硫化物石英脉型金矿化和蚀变岩型金矿化为特征，As，Sb含量不高。研究认为黑刺沟金矿床与矿区石英正长闪长岩类有成因联系，贾公台金矿床与矿区斜长花岗岩有成因联系，不同的岩浆活动造成了金矿化特征的差异。 相似文献
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LA-ICP-MS trace element analysis of pyrite from the Xiaoqinling gold district, China: Implications for ore genesis 总被引：7，自引：0，他引：7
Hai-Xiang Zhao Hartwig E. Frimmel Shao-Yong Jiang Bao-Zhang Dai 《Ore Geology Reviews》2011,43(1):142-153
The Xiaoqinling district, the second largest gold producing district in China, is located on the southern margin of the North China Craton. It consists of three ore belts, namely, the northern ore belt, the middle ore belt and the southern ore belt. Pyrite from the Dahu gold deposit in the northern ore belt and Wenyu and Yinxin gold deposits in the southern ore belt were investigated using a combination of ore microscopy and in-situ laser-ablation inductively-coupled plasma-mass spectrometry (LA-ICP-MS). A range of trace elements was analyzed, including Au, Te, Ag, Pb, Bi, Cu, Co, Ni, Zn, Mo, Hg, As and Si. The results show that there are no systematic differences between the trace element compositions of pyrite in the three deposits from different ore belts. In general, Au concentrations in pyrite are low (from < 0.01 ppm to 2.2 ppm) but Ni concentrations are rather high (up to 8425 ppm). A four-stage mineralization process is indicated by microscopic and field observations and this can be related to the systematic trace element differences between distinct generations of pyrite. Stage I precedes the main gold mineralization stage; pyrite of this stage has the lowest Au concentrations. Stages II and III contributed most of the gold to the ore-forming system. The corresponding pyrite yielded the highest concentrations of Au and Ni. Our microscopic observations suggest that pyrite in the main gold mineralization stage precipitated simultaneously with molybdenite that has been previously dated as Indosinian (~ 218 Ma by Re–Os molybdenite dating), indicating the Indosinian as the main gold mineralization stage. The Indosinian mineralization age and the geological and geochemical features of these gold deposits (e.g., low salinity, CO2-rich ore fluids; spatial association with large-scale compressional structures of the Qinling orogen; δ18O and δD data suggestive of mixing between metamorphic and meteoric waters; δ34S and Pb-isotopic data that point to a mixed crustal-mantle source) all point to typical orogenic-type gold deposits. High Ni concentrations (up to 8425 ppm) of pyrite possibly linked to deep-seated mafic/ultramafic metamorphic rocks provide further evidence on the orogenic gold deposit affinity, but against the model of a granitic derivation of the mineralizing fluid as previously suggested by some workers. Generally low Au concentration in pyrite is also consistent with those from worldwide orogenic gold deposits. Therefore, the gold mineralization in the Xiaoqinling district is described as orogenic type, and is probably related to Indosinian collision between the North China Craton and the Yangtze Craton. 相似文献
18.
中国浅成低温热液金矿床 总被引：2，自引：0，他引：2
浅成低温热液金矿床在中国传统上称为陆相火山岩型金矿床,主要发现在中国东部,后来在北疆地区也有新的发现.根据产出的大地构造背景,它们集中分布在3个带,并分属于3个成矿时期.它们包括:(1)新生代台湾东部岛弧带;(2)晚古生代北疆岛弧带;(3)中生代沿中朝克拉通北界的大陆边缘带;(4)中生代中国东南沿海地区的大陆边缘带.绝大多数矿床是低硫化型的,只有3个是高硫化型的,另有1个是与碱性岩系有关的Au-Te型矿床.除了中国最大的金矿床金瓜石矿床外,迄今为止中国大陆上的浅成低温热液金矿床总的来说只有较小的经济重要性.在中国东部发现的浅成低温热液金矿床的总储量,与区内广泛分布的中生代陆相火山岩十分巨大的体积极不相称.较古老的成矿年龄,中国东部的中生代和北疆的晚古生代,是中国大陆浅成低温热液金矿床的一个鲜明的特点.根据中国的成矿条件和保存条件的分析,以及与美国西部和俄国东部的对比,提出了中国浅成低温热液金矿床成矿潜力的一个初步评估.北疆可能有较大的寻找浅成低温热液金矿床的潜在重要性. 相似文献
19.
Zhao Hailing Deng Jinfu Li Kaiming Xu Liquan Department of Geology Mineral Resources China University of Geosciences Beijing 《中国地质大学学报(英文版)》1999,10(1):67-71
ＴｈｅｅａｓｔｅｒｎＨｅｂｅｉＰｒｏｖｉｎｃｅｏｆＣｈｉｎａｉｓｏｎｅｏｆｔｈｅｍａｊｏｒｃｏｎｃｅｎｔｒａｔｉｎｇａｒｅａｓｏｆｇｏｌｄｍｉｎｅｒａｌｉｚａｔｉｏｎｉｎｅａｓｔｅｒｎＣｈｉｎａ,ｗｈｉｃｈｉｓａｎｉｍｐｏｒｔａｎｔｐａｒｔｏｆｔｈｅ... 相似文献
20.
黑龙江嘉荫-萝北地区金矿构造控矿特征分析 总被引：2，自引：0，他引：2
黑龙江嘉荫-萝北成矿带是我国比较重要的金成矿带，该成矿带上分布有团结沟特大型斑岩型金矿以及杜家河等中、小型金矿床(点)和矿化点，其中绝大部分严格受控于近sN和sN向的乌拉嘎-嘉荫河深断裂带和保兴-四方山林场断裂带。利用应力理论对控矿构造性质进行了分析，发现斑岩型金矿矿体主要产于不同方向断裂的交汇区，而破碎带蚀变岩石英脉型金矿矿体则平行于主断裂呈雁行状排列或密集平行斜列。对矿床产出地质背景的分析认为柳树河花岗岩体、团结沟南部斜长花岗斑岩体、葡萄沟和长脖山花岗斑岩体的接触带为寻找斑岩型金矿的首选靶区．而朝阳沟、中兴沟、德胜沟、横道河子和杜家河上游为寻找破碎带蚀变岩石英脉型金矿的首选靶区。 相似文献