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四平银（金）矿床石英包裹体 Rb－Sr等时线年龄 187± 4 Ma，表明首期成矿作用发生在燕山早期，矿床 Rb－Sr等时线年龄与蚀变绢云母 K－Ar年龄差异及不同矿段矿化特征差异表明，蚀变绢云母 K－Ar年龄反映后期热液成矿事件时代，四平银（金）矿床至少经历了两期热液成矿事件，首期成矿事件发生在燕山早期，晚期成矿事件发生在燕山中期，成矿热液活动时间跨度约 33 Ma。 相似文献
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阿尔山地区是大兴安岭中南段多金属成矿带的重要地段。该区热液脉型铁锰多金属矿、热液脉型钼（铜）矿和矽卡岩型铅锌多金属矿等3种代表性矿床（点）的成矿花岗岩的形成时代一直是研究的薄弱环节。通过多种高精度的U-Pb年龄测定,区内成矿花岗岩的形成时代分别为印支早期（(237.8±2.3) Ma）和燕山中期（(152.2±2.9) Ma）、燕山晚期（(135.1±0.4) Ma）,与邻区乌兰浩特－索伦地区基本可以对应。而前人划定的海西期花岗岩,实际为燕山晚期;划定的燕山早期花岗岩,实际为印支早期、燕山中期。研究成果对于区内花岗岩浆及期后热液与多金属成矿作用在时间上的关系提供了重要依据,对确定区內相应多金属矿类型的成矿花岗岩时代亦提供了可资对比的依据。 相似文献
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郴临深大断裂带及其两侧的矿床成矿系列 总被引：8，自引：1，他引：7
在对该区进行岩浆岩、地球化学、矿床物质组分特征研究的基础上,根据所处构造区带、岩浆岩及成矿特征,划分出三个矿床成矿系列,即：东部后加里东隆起区与燕山期中浅成酸性花岗岩有关的钨锡银矿床成矿系列、西部海西－印支坳陷区燕山期中浅成酸性中酸性花岗岩有关的铜钼铅锌银（金）矿床成矿系列和中部过渡带钨锡铋钼（铅锌银）矿床成矿系列。 相似文献
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新疆阿尔泰印支期伟晶岩的成矿年代学研究 总被引：10，自引：0，他引：10
阿尔泰的伟晶岩长期以来被认为是海西期造山过程的产物。为了查明伟晶岩矿床的成矿时代,本文通过对伟晶岩型稀有金属矿床中白云母的40Ar 39Ar法同位素定年研究,首次在阿尔泰中部的大喀拉苏大型稀有金属矿床和小喀拉苏稀有金属矿床获得了新的同位素年龄数据,其坪年龄分别为248.42±2.11Ma和233.79±0.41Ma,从而证实了印支期稀有金属成矿作用的存在,提出了伟晶岩型矿床形成于多个时代,且稀有金属成矿作用主要发生在海西期造山运动之后的看法。 相似文献
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成矿年代研究对于金矿成矿规律总结和找矿勘查工作具有重要意义。本文系统整理了全国610个大、中、小型金矿的近4000个成岩、成矿年代学数据(数据来源为截至2021年12月公开发表的相关文献资料)。在此基础上, 划分了我国金矿7个主要成矿期, 即新太古代—古元古代成金期(五台期)、中元古代—新元古代成金期(晋宁—雪峰期)、早古生代成金期(加里东期)、晚古生代成金期(海西期)、早中生代成金期(印支期)、晚中生代成金期(燕山期)和新生代成金期(喜马拉雅期); 文章探讨了我国不同地质时期金矿的分布特征、矿床类型和成矿环境。研究结果表明, 中国金矿床在各个地质时期都有产出, 最早的金矿形成于太古宙, 燕山期是我国金矿成矿的高峰期(主要集中于105~145 Ma), 其次为印支期。同时, 近年来的同位素年代学资料表明, 喜马拉雅期金矿不断被发现, 也是我国金矿重要的成矿期之一。总结出中国不同时代金矿的特点为: 成矿强度老弱新强、叠加成矿时间跨度大、新生代金矿资源潜力大。 相似文献
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冀北（京津）地区金（银）矿的成矿主要受古隆起及长期活动的东西向深大断裂带控制.在古隆起内部及边缘发育的近东西向和北东向深断裂的交汇部位,形成了多个金（银）等多金属矿化集中区.与金（银）矿成矿关系密切的岩浆活动主要为燕山期,其次为海西期.金（银）矿化多位于岩浆作用形成的中酸性岩体附近或岩体之间.太古宙变质岩系中的“角闪质”岩石的金（银）元素背景值普遍较高,为本区的主要矿源层,角闪岩相是含金（银）的主要岩相.金矿成矿为多期、多次叠加,主要成矿时代为海西期和燕山期,其中燕山期较为重要,是区域金、银、铜、铅、锌成矿的主要时期. 相似文献
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小西南岔金-铜矿床为一主体产于海西期花岗闪长岩-石英闪长岩体内的大型石英脉-蚀变岩型矿床,目前对其金、铜成矿时代认识主要有海西期、燕山期(148～123.35±0.8)Ma及108～98Ma等3种不同观点。本文利用矿区新发现的穿切金-铜矿体的辉钼矿-石英脉辉钼矿Re-Os同位素定年方法,对该矿床成矿时代进行了重新限定,确定了矿区金-铜成矿作用时代上限为109 Ma,提出了矿床形成时代介于(123.35±0.8)～109 Ma,金-铜矿化与燕山晚期细粒(花岗)闪长岩活动有关的认识。 相似文献
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Abstract. Intrusion‐related gold deposits are widely distributed within the North China craton or along its marginal fold belts. Presently, about 200 individual intrusion‐related gold deposits (prospects) have been discovered, among which Yuerya, Anjia‐yingzi, Linglong, Jiaojia, Chenjiazhangzi, Qiyugou, Jinjiazhuang, Dongping, Hougou, Huangtuliang, Guilaizhuang, Wulashan and Donghuofang are the most important ones. In general, the intrusion‐related gold deposits can be classified into three major groups according to their host rocks: (1) hosted by or related to felsic intrusions, including (la) calc‐alkaline granitoid intrusions and (lb) cryptoexplosion breccia pipes; (2) related to ultramafic intrusions, and (3) hosted by or related to alkaline intrusions. The first group contains the Yuerya, Anjiayingzi, Linglong, Jiaojia, Chenjiazhangzi and Qiyugou gold deposits. Gold mineralization at these deposits occurs within Mesozoic Yanshanian calc‐alkaline granitoid intrusions or cryptoexplosion breccia pipes as gold‐bearing quartz veins and replacement bodies. Pyrite, galena, sphalerite, chalcopyrite, native gold and electrum are major metallic minerals. The Jinjiazhuang deposit belongs to the second group, and occurs within Hercynian diopsidite and peridotite as quartz veins and replacement bodies. Pyrite, marcasite, arsenopyrite, native gold and electrum are identified. The third group includes the Dongping, Hougou, Huangtuliang, Guilaizhuang, Wulashan and Donghuofang deposits. Gold mineralization at these deposits occurs predominantly within the Hercynian alkaline intrusive complexes as K‐feldspar‐quartz veins and replacement bodies. Major metal minerals are pyrite, galena, chalcopyrite, tellurides, native gold and electrum. All these pyrite separates from Hercynian and Yanshanian intrusions or cryptoexplosion pipes associated with the gold deposits show a broad range in δ34S value, which is overall higher than those Precambrian rocks and their hosted gold deposits. For the alkaline intrusion‐related gold deposits, the δ34S values of the sulfides (pyrite, galena and chalcopyrite) from the deposits increase systematically from orebodies to the alkaline intrusions. All of these intrusion‐related gold deposits show relatively radiogenic lead isotopic compositions compared to mantle or lower crust curves. Most lead isotope data of sulfides from the gold ores plot in between the fields of the intrusions and Precambrian metamorphic rocks. Data are interpreted as indicative of a mixing of sulfur and lead from magma with those from Precambrian metamorphic rocks. Isotopic age data, geological and geochemical evidences suggest that the ore‐forming materials for the intrusion‐related gold deposits were generated during the emplacement of the Hercynian or Yanshanian intrusion. The calc‐alkaline or alkaline magma may provide heat, volatiles and metals for the intrusion‐related gold deposits. Evolved meteoric water, which circulated the wall rocks, was also progressively involved in the magmatic hydrothermal system, and may have dominated the ore fluids during late stage of ore‐forming processes. Therefore, the ore fluid may have resulted from the mixing of calc‐alkaline or alkaline magmatic fluids and evolved meteoric water. All these intrusion‐related gold deposits are believed to be products of Hercynian or Yanshanian calc‐alkaline and alkaline igneous processes along deep‐seated fault zones within the North China craton or along its marginal belts. 相似文献
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湖南省内生金属矿产资源颇为丰富。钨、锡、铅、锌、锑为省内优势矿种；稀土、稀有、金、银、铜、汞也占有十分重要的地位。按照成矿过程中的主导地质作用，省内金和有色金属矿床可以划分为五个矿订成矿系列。本文对各矿床成矿系列的形成地质背景、产出构造条件、赋矿围岩、矿床类型进行了总结；并对其时空展布规律进行了讨论。 相似文献
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中国侵入岩中改造成因金矿床基本特征及成矿机制 总被引：5，自引：1，他引：5
侵入岩中的金矿床多为改造作用形成。赋矿侵入体岩性多样，从超镁铁－镁铁到中性－酸性－碱性成分均有发现。岩体发育在克拉通、克拉通边缘活化带及褶皱带中，其时代从太古宙到燕山期都有发现。其中超镁铁岩－镁铁岩－闪长岩－碱性岩－斜长岩为上地幔或上地幔－下地壳的重熔或混染的产物，中－酸性岩为地壳深部含金火山沉积岩系重熔形成。金矿床有细脉浸染、石英脉、细脉浸染＋石英脉等类型。在大岩体中矿床发育在内接触带的断裂系中 相似文献
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内蒙古白乃庙地区金矿成矿作用 总被引：5，自引：1，他引：5
内蒙古白乃庙金矿床为石英脉型和石英脉+蚀变岩型金矿,赋存于海西期的岩浆岩和白乃庙组的绿片岩中。海西期的石英闪长岩和斜长花岗岩的金丰度值为9 0×10-9～15 0×10-9,矿石铅同位素与海西期斜长花岗岩的铅同位素组成相似,反映成矿母岩可能为矿区的海西期岩浆岩;硫化物铅同位素的Δγ和Δβ值及硫同位素δ34S值显示成矿物质来源于深部,与岩浆岩有关;石英流体包裹体的δD水值、计算得出的δ18O水值和方解石的δ13C值表明成矿流体起源于岩浆,演化过程中有大气降水的加入。成矿作用是在区域构造体制发生转换后,于伸展地球动力学环境下进行的,成矿期控矿构造均呈张性,具有多阶段活动的特点。Au在成矿热液体系中可能与Cl-、HS-结合形成络合物或与H3SiO-4结合形成AuH3SiO4并发生迁移而形成金矿。 相似文献
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闪长岩类侵入体中改造型金矿床形成分析 总被引：4，自引：1，他引：3
赋金闪长岩类侵入体主要发育于褶皱带中,形成时代在晋宁期至印支期,金矿主要以石英硫化物型主于岩体硫碎带中,成矿时期在印支期到喜山期之间,成岩成矿之间存在巨大时关茂矿物质主要来自岩体及含金沉积岩系,成矿流体以大握降水及建造水为主。闪长岩类侵入体中的金矿床主要是改造作用形成的。 相似文献
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文章在梳理分析相关文献的基础上,综合考虑区域构造成矿背景、超大型金矿形成条件、金矿脉形成深度及隆升剥蚀幅度等方面的因素,认为哈达门沟—柳坝沟金矿田经历了漫长的地质演化,是多期次叠加成矿;在海西中、晚期初步富集,到印支期大规模成矿,再到燕山期进一步叠加富集并遭受后生改造;主成矿期为印支期,主成矿年代集中于217～240 Ma之间. 相似文献
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Gold Deposits in Beishan Mountain, Northwestern China 总被引：2，自引：0，他引：2
Abstract. The Beishan Mountain spans three provinces ‐ Gansu, Xinjiang and Inner Mongolia, having an area of 120,000 km2 Tectonically, it transverses three different tectonic units, i.e. Siberia, Kazakhstan and Tarim plates, and is composed of nine ter‐rains with widely exposed Precambrian and Paleozoic strata, complex structures, intensive magmatic activities and widespread ore deposits. It is not only a main part of Tianshan‐Yinshan‐Great Hinggan metallogenic belt in China, but also a key to under‐stand the evolution of central‐Asian orogenic system. At present, more than 100 gold deposits and prospects have been discovered, explored and mined, among which Nanjinshan, Mazhuangshan, Liushashan, Jinwozi, Zhaobishan and Xiaoxigong are the most important ones. Based on the host rocks and the geological features, all these gold occurrences can be subdivided into three groups (or types): (1) hosted by Carboniferous or Permian volcanic or subvolcanic rocks; (2) hosted by or related to plutonic intrusions; and (3) hosted by Precambrian metamorphic rocks. The first group includes the Mazhuangshan gold deposit, which occurs in Hercynian quartz por‐phyry and rhyolite porphyry as gold‐bearing quartz veins. The second group is composed of the Liushashan, Nanjinshan Zhaobishan and Jinwozi gold deposits. Gold mineralization at these four deposits occurs within Hercynian granitoids intrusion: or late Paleozoic sedimentary rocks as quartz veins, veinlets and altered rocks. The Xiaoxigong gold deposit belongs to the third group, and is hosted by Precambrian schist, amphibolite and migmatite as quartz veins and altered rocks. Isotopic age dating data, geological and geochemical evidence suggest that most of the groups 1 and 2 gold deposits were generated during the emplacement of the Hercynian or partly Indosinian intrusions. These intrusions may provide both heat and metals for groups 1 and 2 deposits. In contrast, although the formation is closely related to the Hercynian magma‐tism, the ore‐forming materials of the group 3 deposits may not only come from the intrusions, but also from the Precambrian metamorphic rocks. 相似文献
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五台山区金矿床的多金源多期次多成因多类型叠加成矿特征 总被引：1，自引：0，他引：1
五台山区的金矿床都是叠加成因的矿床。金源层的微量分散金，被构造热事件所活化，迁移到容矿构造中重新，同一容矿构造多次活动和成矿，致使金品位逐次升高，形成矿床。这些金矿床具多源性、多期性、多成因和多类型叠加之特征。 相似文献
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西天山地区金矿床主要成因类型及找矿方向 总被引：13，自引：4，他引：13
西天山地区地处古亚洲构造域天山-兴蒙成矿带的西段，经历了漫长复杂的构造演化过程，尤其是海西期强烈的构造岩浆活动，为金成矿创造了有利的条件．近几年，本区找金工作取得了突破性的进展，相继发现了阿希、望峰、大山口等金矿床，显示了良好找金前景．根据前人和笔工作，讨论了本区主要金矿化类型浅成低温热液型(又进一步划分为冰长石-绢云母型和硅化岩型)斑岩型、韧性剪切带型穆龙套型等的成矿特征，在综合分析基础上，指出找矿方向． 相似文献