共查询到19条相似文献，搜索用时 453 毫秒
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内蒙古狼山—渣尔泰山中元古代被动陆缘热水喷流成矿特征 总被引：22，自引：1，他引：21
狼山—渣尔泰山中元古代被动陆缘产有东升庙、炭窑口、霍各乞和甲生盘等热水喷流沉积矿床 ,与世界中元古代的SEDEX型矿集区有许多相似之处 :①矿床的产出受华北古陆北缘裂陷槽内三级断陷盆地控制 ;②各大矿床都具有鲜明的层控特征 ,所有矿体总体呈层产在中元古界的白云石大理岩、碳质千枚岩 (或片岩 )中 ;③矿石具有细纹层状、条带状构造 ,喷流沉积成矿特征十分明显 ;④成矿过程中伴有明显的同生断裂活动 ,它在一定程度上控制了矿体的空间分布及其组合 ;但不同矿床同生断裂活动的强度、时限、规模都不同 ,从而导致不同矿床在相同含矿岩组中矿体产出的先后顺序不同和大量层间砾岩与同生角砾状矿石的形成 ;⑤厚大Zn ,Pb ,Cu复合矿体具有明显的分带性 ,自下至上 ,Cu/ (Zn +Pb +Cu)比值由高→低 ;⑥重晶石层发育 ,多与黄铁矿层互层状产出 ,也有与闪锌矿层互层 ,但与世界典型SEDEX型矿床又有重要差别。成矿期间火山活动明显 ,在霍各乞、东升庙、炭窑口矿床惟一容矿的狼山群第二岩组中先后发现了具有变余斑状或聚斑状结构、变余杏仁构造的基性火山岩、钠质“双峰式”火山岩和钾质“双峰式”海相火山岩及凝灰岩夹层。结合①各种硫化物的铅同位素主要分布在地幔和下地壳铅演化曲线附近 ;②部分黄铁矿的Co/Ni值远 相似文献
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内蒙古狼山—渣尔泰山中元古代SEDEX型矿带火山活动与成矿的关系 总被引：2，自引：2，他引：0
狼山—渣尔泰山中元古代SEDEX型成矿带与世界典型SEDEX型矿床有重要差别 ,成矿期间火山活动明显,在霍各乞、东升庙、炭窑口矿床唯一含矿岩组中各有岩类不同的变质海相火山岩夹层。依据：① 基性火山岩的SmNd等时线年龄为1491～1824 Ma（稍老或接近各矿床的铅模式年龄）,εNd(t)＝3.48～6.4、轻稀土富集、重稀土亏损,其成岩物质来自地幔或下地壳;② 一些矿石也是轻稀土富集、重稀土亏损、与火山岩夹层的稀土球粒陨石标准化曲线具有相似性;③ 各种硫化物的铅同位素都有一些分布在地幔和下地壳铅演化曲线附近;④ 部分黄铁矿的Co/Ni1;⑤ 在有些矿石中还新见到火山岩块与岩屑、凝灰岩块和晶屑;⑥各矿床的Zn、Pb、Cu、Fe硫化物矿体都是在火山岩夹层的上覆地层中大量产出,甲生盘矿床缺少火山岩（只有凝灰岩）夹层时,没有铜矿体,而霍各乞、东升庙、炭窑口矿床含矿岩组中有火山岩夹层时,便都有铜矿体,可以推测同沉积期内间歇性的小规模海底火山喷发与成矿关系密切：它既直接提供了一部分成矿物质（与火山岩夹层同源）,又导致长期存在地热异常,极有利于海底热水对流系统的形成与循环,使深部富含Zn、Pb、Cu、Fe的成矿流体不断地顺同生断裂上升至海盆喷流沉积成矿。这也证明元古宙SEDEX型矿床成矿作用的多样性和复杂性。 相似文献
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内蒙古狼山-渣尔泰山矿集区海底喷流成矿特征与勘查 总被引：4，自引：0，他引：4
狼山-渣尔泰山矿集区内的东升庙、炭窑口、霍各乞和甲生盘等大型-超大型矿床的产出受华北古陆北缘裂陷槽内三级断陷盆地控制，都具有鲜明的层控与岩控特征、矿体总体呈层产在中元古界的白云石大理岩、炭质千枚岩（或片岩）中，成矿过程中的同生断裂活动与强度在一定程度上控制了矿体的空间分布与矿床规模。狼山地区的霍各乞、东升庙、炭窑口矿床成矿期间伴有明显的火山喷发活动，可归于SEDEX-VMS型之间、但靠近SEDEX型一侧的矿床，而甲生盘矿床则表现出较典型的SEDEX型矿床的成矿特点。古生代以来的造山过程对本类矿床有明显的改造与叠加成矿。新区与现有矿床深部及外围的找矿宜注重对容矿岩组中同生断裂活动遗迹与同沉积期火山活动产物的识别以及后期蚀变特征的追踪。 相似文献
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新疆阿舍勒铜锌块状硫化物矿床成矿条件和成矿特点 总被引：3，自引：0，他引：3
阿舍勒铜锌矿床是一个典型的火山岩型块状硫化物矿床。大陆边缘裂谷带是矿床形成的大地构造环境。早中泥盆世火山活动形成了含矿的双峰式火山岩套。矿床产于近喷发间歇期的石英角斑质角砾凝灰岩中，受火山洼地和同生断裂控制。 相似文献
5.
经研究确认,内蒙古查干哈达庙铜矿床属于块状硫化物型富铜矿床。该矿床类型的首次确认,为华北陆块北缘寻找古生代块状硫化物型富铜矿床提供了例证。查干哈达庙铜矿床位于华北陆块北缘,赋矿地层（即含矿岩系）为石炭系上统本巴图组流纹质凝灰岩、凝灰质板岩,其上为条带状结晶灰岩、生物碎屑结晶灰岩。含矿岩系中存在硅质岩、含铁硅质岩、碧玉岩及萤石重晶石矿层。硫化物矿体呈层状、似层状,产于流纹质凝灰岩、凝灰质板岩岩层中,产状与岩层产状一致。矿床含矿岩系具有＂火山碎屑岩、硫化物矿体、碧玉岩＂的＂三位一体＂特征。矿石具有条带状、层纹状构造。矿石中主成矿元素为Cu,伴生有益元素为Au,S,Pb,Zn,铜矿石品位较高,属富铜矿。矿床地质特征表明其属块状硫化物型铜矿床。该类型矿床的找矿标志是,在海相酸性火山岩及碳酸盐岩之间,地表存在与硅质岩共存的黄钾铁矾、铁帽型硫化物氧化带;具有以铜为主的铜、锌组合的化探异常;具有低阻高极化的物探异常。 相似文献
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内蒙狼山成矿带东升庙多金属硫铁矿床成矿特征及成因探讨 总被引：1，自引：0，他引：1
东升庙多金属硫铁矿床产于中元古界狼山群一套细碎屑-碳酸盐岩含矿建造中。矿床受元古宙裂陷槽次级断陷盆地控制,具时控、层控性。据容矿岩石、矿石矿物微量元素和硫、碳、氧、铅同位素及稀土元素分析研究,认为矿床具有多阶段成矿特点,矿床成因类型属海底喷气沉积一弱改造型矿床。 相似文献
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东升庙矿床是内蒙古狼山-渣尔泰山成矿带上最大的锌多金属矿床,主要含矿岩系是狼山群第2岩组。通过对矿区地质现象的野外观察和钻孔样品地球化学特征的研究,结合国际上同类矿床最新研究进展,对东升庙矿床主矿体的成矿过程提出了新观点。岩、矿石样品的岩相学研究结果显示,不同岩段的岩、矿石有不同的组构特征：第4岩性段中部菱铁矿矿石为典型的细粒镶嵌结构和块状构造,具明显的化学沉积特征;第4岩性段底部②号矿体中的闪锌矿矿石具半自形-它形晶粒结构或溶蚀结构,多为角砾状构造或块状构造,有明显的充填-交代现象;第3岩性段以绢云石墨片岩为主的黑色岩系网脉状矿化普遍,常见后期热液充填现象。岩矿石样品的地球化学研究结果显示,菱铁矿矿石和闪锌矿矿石有相似的微量元素富集特征和稀土元素配分曲线,可能具有同一物质来源。而第3岩性段的绢云石墨片岩有不同的微量元素富集特征和稀土元素配分曲线,可能是多期热液活动作用的结果。值得一提的是,在②号主矿体硫化物矿石中不但发现有来自于矿体下部的有一定磨圆度的绢云石墨片岩碎屑角砾,还有一些来自上部围岩的含炭质白云大理岩角砾。此类碎屑角砾可能是交代残余或者交代过程中垮塌的产物,无法用同时沉积解释。综合分析认为第3岩性段的网脉状矿化是后期热液充填的结果,而第4岩性段底部的②号矿体是含矿热液选择性交代碳酸盐地层而成矿,菱铁矿矿体是富铁热液运移到海底后沉积生成。相对于传统的喷流沉积成矿方式,本文认为交代作用对东升庙主矿体的形成起到了关键作用。 相似文献
8.
内蒙古东升庙矿床火山作用新证据的发现及其意义 总被引：2，自引：0，他引：2
东升庙硫－多金属矿床狼山群二组含矿地层中，除已发现的变质石英角斑岩之外，又找到具有变余斑状结构（斑晶主要为钠质斜长石，另有少量辉石和角闪石）的变质基性火山岩和变质凝灰岩夹层以及火山岩屑与晶屑。这既直接证实本矿在成岩成矿期有明显的间歇性火山喷发活动、成矿与火山喷发作用有关，又可为研究本矿床成矿地质构造背景、成岩成矿历史，进而判别矿区古火山口的位置，进行区域对比与确认同生断层等问题提供岩石学的基本素材。此外，它们还可作为本区有效的找矿标志 相似文献
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内蒙狼山成矿带东升庙多金属硫铁矿床成矿特征及成因探讨 总被引：6，自引：1，他引：6
东升庙多金属硫铁矿床产于中元古界狼山群一套细碎屑-碳酸盐岩含矿建造中。矿床受元古宙裂陷槽次级断陷盆地控制，具时控、层控性。据容矿岩石、矿石矿物微量元素和硫、碳、氧、铅同位素及稀土元素分析研究，认为矿床具有多阶段成矿特点，矿床成因类型属海底喷气沉积-弱改造型矿床。 相似文献
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PENGRunmin ZHAIYusheng 《《地质学报》英文版》2004,78(2):534-547
Most ore-forming characteristics of the Langshan-Zha‘ertaishan hydrothermal exhalation belt, which consists of the Dongshengmiao, Huogeqi, Tanyaokou and Jiashengpan large-superlarge Zn-Pb-Cu-Fe sulfide deposits, are most similar to those of Mesoproterozoic SEDEX-type provinces of the world. The characteristics include: (1) All deposits of this type in the belt occur in third-order fault-basins in the Langshan-Zha‘ertaishan aulacogen along the northern margin of the North China Platform; (2) these deposits with all their orebodies hosted in the Mesoproterozoic impure dolomite-marble and carbonaceous phyllite (or schists) have an apparent stratabound nature; ores display laminated and banded structures, showing clear depositional features; (3) there is some evidence of syn-sedimentary faulting, which to a certain extent accounts for the temporal and spatial distribution and the size of the orebodies in all deposits and the formation of intrabed conglomerates and breccias; (4) they show lateral and vertical zonation of sulfides; (5) The Cu/(Pb Zn Cu) ratio of the large and thick Pb Zn Cu orebodies gradually decreases from bottom to top; and (6) barite is interbedded with pyrites and sometimes with sphalerite. However, some characteristics such as the Co/Ni radio of the pyrites, the volcanism, for example, of the Langshan-Zha‘ertalshan metallogenic belt, are different from those of the typical SEDEX deposits of the world. The meta-basic volcanic rock in Huogeqi, the sodic bimodal volcanic rocks in the Dongshengmiao and potassic bimodal-volcanic rocks with blastoporphyfitic and blasto-glomeroporphyritic texture as well as blasto-amygdaloidal structure in the Tanyaokou deposits have been discovered in the only ore-bearing second formation of the Langshan Group in the past 10 years. The metallogeny of some deposits hosted in the Langshan Group is closely related to syn-sedimentary volcanism based on the following facts: most of the lead isotopes in sphalerite, galena, pyrite, pyrrhotite and chalcopyrite plot on both sides of the line for the mantle or between the lines for the mantle and lower crust in the lead isotope composition diagram; cobalt content of some pyrites samples is much higher than the nickel content (Co/Ni= 11.91-12.19). Some volcanic blocks and debris have been picked out from some pyritic and pyrrhotitic ores. All Zn-Pb-Cu-Fe sulfide orebodies in these deposits occur in the strata overlying metamorphic volcanic rocks in the only ore-bearing second formation. In the Jiashengpan deposit that lacks syn-sedimentary volcanic rocks in the host succession only Pb and Zn ores occur without Cu ore, but in the Dongshengmiao, Tanyaokou and Huogeqi deposits with syn-sedimentary volcanic rocks in the host succession Cu ores occur. This indicates a relatively higher ore-forming temperature. The process of synsedimentary volcanic eruption directly supplied some ore-forming elements, and resulted in secular geothermal anomaly favorable for the circulation of a submarine convective hydrothermal system, which accounts for the precipitation of deep mineralizing fluids exhaling into anoxidic basins along the syn-sedimentary fault system in the Langshan-Zha‘ertai rift. The Dongshengmiao, Tanyaokou, and Huogeqi deposits hosted in the Langshan Group appear to be a transitional type of mineral deposit between SEDEX and VMS-types but with a bias towards SEDEX, while the Jiashengpan deposit hosted in the Zha‘ertai Group is of a characteristic SEDEX type. This evidence, together with other new discoveries of Mesoproterozoic volcanic rocks and the features of lithogeny and metallogeny of the Bayun Obo deposit in the neighborhood emphasize the diversity, complexity and uniqueness of the Mesoproterozoic Langshan-Zha‘ertal-Bayun Obo ore belt. 相似文献
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PENG Runmin ZHAI YushengKey Laboratory of Lithospheric Tectonics Lithoprobing Technology China University of Geosciences Ministry of Education Beijing 《《地质学报》英文版》2004,78(2)
Most ore-forming characteristics of the Langshan-Zha'ertaishan hydrothermal exhalation belt, which consists of the Dongshengmiao, Huogeqi, Tanyaokou and Jiashengpan large-superlarge Zn-Pb-Cu-Fe sulfide deposits, are most similar to those of Mesoproterozoic SEDEX-type provinces of the world. The characteristics include: (1) All deposits of this type in the belt occur in third-order fault-basins in the Langshan-Zha'ertaishan aulacogen along the northern margin of the North China Platform; (2) these deposits with all their orebodies hosted in the Mesoproterozoic impure dolomite-marble and carbonaceous phyllite (or schists) have an apparent stratabound nature; ores display laminated and banded structures, showing clear depositional features; (3) there is some evidence of syn-sedimentary faulting, which to a certain extent accounts for the temporal and spatial distribution and the size of the orebodies in all deposits and the formation of intrabed conglomerates and breccias; (4) they show lateral and vertical 相似文献
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PENG Runmin ZHAI YushengKey Laboratory of Lithospheric Tectonics Lithoprobing Technology China University of Geosciences Ministry of Education Beijing 《《地质学报》英文版》2004,78(2)
Most ore-forming characteristics of the Langshan-Zha'ertaishan hydrothermal exhalation belt, which consists of the Dongshengmiao, Huogeqi, Tanyaokou and Jiashengpan large-superlarge Zn-Pb-Cu-Fe sulfide deposits, are most similar to those of Mesoproterozoic SEDEX-type provinces of the world. The characteristics include: (1) All deposits of this type in the belt occur in third-order fault-basins in the Langshan-Zha'ertaishan aulacogen along the northern margin of the North China Platform; (2) these deposits with all their orebodies hosted in the Mesoproterozoic impure dolomite-marble and carbonaceous phyllite (or schists) have an apparent stratabound nature; ores display laminated and banded structures, showing clear depositional features; (3) there is some evidence of syn-sedimentary faulting, which to a certain extent accounts for the temporal and spatial distribution and the size of the orebodies in all deposits and the formation of intrabed conglomerates and breccias; (4) they show lateral and vertical 相似文献
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狼山-渣尔泰山是华北克拉通北缘西段元古宙伸展构造体制下被动陆缘的重要热水喷流成矿带,内产东升庙、炭窑口、霍各乞、甲生盘等大型-超大型矿床,其含矿建造是元古宇渣尔泰山群。该成矿带的主体在狼山山脉主峰地区,产有东升庙、炭窑口、霍各乞三大矿床。自2010年在狼山西南原渣尔泰山群阿古鲁沟组地层中发现新元古代酸性火山岩(锆石年龄816~805 Ma)以来,其东部狼山主峰地区的渣尔泰山群及产在其中的炭窑口、东升庙、霍各乞矿床是否也都可以归于新元古代形成是需要进一步研究的重要科学问题。本文依据的事实有:(1)狼山西南新元古界的碎屑锆石最小年龄为1 155 Ma与碳酸盐岩是方解石大理岩;(2)炭窑口矿区渣尔泰山群顶部刘鸿湾组地层的碎屑锆石年龄的两个年龄峰值分别为1 862~1 762 Ma(最小年龄为1 732 Ma)和2 448 Ma,所含碳酸盐岩全部是白云石大理岩类;(3)狼山北侧狼山群含矿岩组中发现年龄为887 Ma±的新元古代基性火山岩; (4)霍各乞矿床含重晶石与微晶长石的硅质层发育,多与黄铁矿层互层状产出,也有与闪锌矿+磁黄铁矿及方铅矿层互层,激光原位分析得到的黄铁矿、方铅矿、闪锌矿和磁黄铁矿的δ34S为17.60‰~21.97‰,显示喷流成矿的硫同位素组成特征。根据以上事实可以确认:(1)狼山西南含酸性火山岩与方解石大理岩的前寒武纪地层是与狼山南侧炭窑口矿区含白云石大理岩的渣尔泰山群在不同盆地中沉积而成;(2)狼山南侧是中元古代裂谷带,产有以炭窑口、东升庙矿床为代表的中元古代喷流-沉积成矿系统;(3)狼山北侧是新元古代裂谷带,产有以霍各乞矿田为代表的新元古代热水喷流成矿系统。产在新元古代狼山群中的霍各乞矿是介于SEDEX型与VMS型之间、但靠近SEDEX型一侧的热水喷流-沉积矿床。 相似文献
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The giant Dongshengmiao Zn–Pb–Cu deposit is located in the Langshan district, northern China. The ores are hosted within a Proterozoic rift sequence, which underwent lower greenschist facies metamorphism and shear deformation during development of Early Cretaceous intraplate orogenic belt. Northwest-dipping thrust faults, which share similar orientations and dip angles with the orebodies, are well developed in the mining area. Syngenetic stratabound sulfides were formed during the Proterozoic rifting event, but syngenetic ore textures have seldom been preserved except for some pretectonic fine-grained pyrite. Petrological observation, 39Ar/40Ar geochronology, combined with previous isotopic and fluid inclusion studies indicates that significant Zn–Pb–Cu remobilization took place as a result of thrust faulting associated with metamorphic devolatilization of ore-hosting rocks at ca. 136 Ma, coeval with the intraplate orogeny and regional crustal shortening. Sulfides were redistributed in shear structures or along grain boundaries of ore-hosting carbonates, and Fe-rich carbonates were ideal sites for Zn–Pb–Cu precipitation. 相似文献
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Peng Runmin Zhai Yusheng Deng Jun Xiao Rongge Wang Jianping Faculty of Earth Sciences Mineral Resources China University of Geosciences Beijing China 《中国地质大学学报(英文版)》2000,11(3)
INTRODUCTIONThe L angshan- Zhaertai metallogenic belt is a typicalSEDEX belt of the Mesoproterozoic passive continental m ar-gins in the west section of the northern margin of the NorthChina platform(Zhai et al.,1997) (Fig.1) .The ore- form inggeological setting,the division and correlation of the host suc-cession,the geological features of typical ore deposits andtheir genesis of the belt have been described in references(Zhai et al.,1997;Wang and Zhao,1994;Wang et al.,1992 ;L i et… 相似文献
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Xiaofeng Li Yasushi Watanabe Jingwen Mao Shengxiang Liu Xiankui Yi 《Resource Geology》2007,57(3):325-337
The Yinshan deposit in the Jiangnan tectonic belt in South China consists of Pb‐Zn‐Ag and Cu‐Au ore bodies. This deposit contains approximately 83 Mt of the Cu‐Au ores at 0.52% Cu and 0.8 g/t Au, and 84 Mt of the Pb‐Zn‐Ag ores at 1.25% Pb, 1.02% Zn and 33.3 g/t Ag. It is hosted by low‐grade metamorphosed sedimentary rocks and mafic volcanic rocks of the lower Mesoproterozoic Shuangqiaoshan Group, and continental volcanic rocks of the Jurassic Erhuling Group and dacitic subvolcanic rocks. The ore bodies mainly consist of veinlets of sulfide minerals and sulfide‐disseminated rocks, which are divided into Cu‐Au and Pb‐Zn‐Ag ore bodies. The Cu‐Au ore bodies occur in the area close to a dacite porphyry stock (No. 3 stock), whereas Pb‐Zn‐Ag bodies occur in areas distal from the No. 3 stock. Muscovite is the main alteration mineral associated with the Cu‐Au ore bodies, and muscovite and chlorite are associated with the Pb‐Zn‐Ag ores. A zircon sensitive high‐resolution ion microprobe U‐Pb age from the No. 3 dacite stock suggests it was emplaced in Early Jurassic. Three 40Ar‐39Ar incremental‐heating mineral ages from muscovite, which are related to Cu‐Au and Pb‐Zn‐Ag mineralization, yielded 179–175 Ma. These muscovite ages indicate that Cu‐Au mineralization occurred at 178.2±1.4 Ma (2σ), and Pb‐Zn‐Ag mineralization at 175.4±1.2 Ma (2σ) and 175.3±1.1 Ma (2σ), which supports a restricted period for the mineralization. The Early Jurassic ages for the mineralization at Yinshan are similar to that of the porphyry Cu mineralization at Dexing in Jiangnan tectonic belt, and suggest that the polymetallic mineralization occurred in a regional transcompressional tectonic regime. 相似文献
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在充分研究已有资料的基础上,通过野外实地调研,以内蒙古中西部渣尔泰山地区为主要研究对象,对渣尔泰山群地层进行了划分,并探讨了该地层地球化学特征,最后就该地层含矿性进行了评价。结果表明：中元古界渣尔泰山群为一套浅变质岩系,属裂谷系中的碎屑岩、炭质页岩、粉砂岩和碳酸盐岩建造,自下而上分为书记沟组、增隆昌组、阿古鲁沟组和刘鸿湾组,主要含矿层为阿古鲁沟组;渣尔泰山群沉积环境呈现由陆相→正常海相→半封闭海相或次深海相→滨海相的正常海进海退序列变化特征;渣尔泰山群地层在纵向上自下而上表现为亲碎屑元素组合→亲碳酸盐元素组合→亲铁、亲硫元素组合→亲碳酸盐、亲碎屑岩的混合组合;岩石组分与成矿元素有显著相关性,泥质、钙镁质岩富含铅、锌及硫铁,高硅质岩石富含铜,有机碳含量往往与矿层的规模、质量成正消长关系;不同的构造演化阶段和沉积环境致使元素分布不均匀,体现在含矿性在东西走向的规律性变化,即东部甲生盘—山片沟矿床贫铜富锌,少伴生元素,而西部狼山地区铜、铅、锌共生,贫铅锌富铜,伴生元素较多。 相似文献