共查询到19条相似文献，搜索用时 140 毫秒
1.
河南桐柏围山城层控金银成矿带同位素地球化学 总被引：8，自引：2，他引：6
河南省桐柏山区的围山城金银成矿带包括破山特大型银矿、银洞坡大型金矿、银洞岭大型银多金属矿床及一些矿点,赋矿地层是新元古界歪头山组,矿体产状与地层产状一致,形态呈似层状、鞍状或透镜状,层控特征显著。氢-氧-碳同位素地球化学研究指示早、中阶段的成矿流体主要为变质水,晚阶段有大量大气降水加入成矿流体系统。碳-硫-铅同位素指示成矿物质来自于歪头山组地层;钾-氩同位素表明成矿作用(100~140Ma)发生在秦岭陆陆碰撞造山的高峰期之后碰撞挤压向伸展转变的背景下。综合考虑矿带的成矿流体来源、成矿物质来源以及矿床地质特征,认为围山城成矿带属典型的层控造山型金银成矿系统,形成于中生代扬子与华北板块的陆陆碰撞造山体制。 相似文献
2.
河南省桐柏县银洞坡金矿床同位素地球化学 总被引：11，自引：10，他引：11
银洞坡金矿床位于河南肖桐柏地区围山城金银多金属矿带内,矿体定位受新元古界歪头山组地层控制。各成矿阶段热液石英中流体的δ~(18)O_w值为0.0‰～10.8‰,晚期碳酸盐中流体的δ~(18)O_W 值为-5.3‰～-9.7‰,流体的δD值为-65‰～-84‰,显示早阶段成矿流体以来自赋矿地层的变质水为主,晚阶段大气降水不断混入。包裹体的δ~(13)C_(CO)_2值介于-3.7‰～ 6.7‰,指示流体的碳主体来自碳酸盐储库。硫化物的δ~(34)S 值介于 1.3‰～ 3.1‰,具塔式分布特征,硫主要源自围岩歪头山组。~(206)Pb/~(204)Pb=16.540～17.216,~(207)Ph/~(204)Pb=15.056～15.612,~(208)Pb/~(204)Pb=37.336～38.861,显示较明显的铀铅亏损特征,矿石铅ω值介于39.50～48.62,显示铅源的物质成熟度高,为赋矿地层歪头山组,矿石铅同位素与歪头山组地层的一致性及其与南、北秦岭其它构造岩石单元的差异表明,银洞坡金矿的成矿物质主要来自歪头山组地层。无论在成矿流体和物质来源方面,还是在矿床地质特征方面,银洞坡金矿都应属于典型的层控造山型金矿,并形成于扬子与华北大陆板块的碰撞体制。 相似文献
3.
河南桐柏围山城金银成矿带成矿物质来源:
铅同位素证据 总被引：1，自引：0，他引：1
围山城金银成矿带出露有破山银矿床、银洞坡金矿床和银洞岭银矿床等三个大型金银矿床,均受地层和构造的双重控制,赋矿地层为新元古界歪头山岩组,河前庄背斜是成矿带的主要控矿构造.围岩地层歪头山岩组的铅同位素组成具有整体富Th亏U、低μ高ω的特征,与围山城金银成矿带的矿石铅整体富Th亏U、低μ高ω的特征一致.经过年龄校正后,把成矿带内的围岩地层和岩体的全岩铅同位素样品与矿石铅同位素对比分析发现,围岩歪头山岩组与矿石关系最为接近,其次为燕山期梁湾花岗岩体.成矿带的矿石铅具有混源特征.可以认为围岩歪头山岩组和梁湾花岗岩体共同为成矿带提供了铅源及成矿物质. 相似文献
4.
青海虎头崖铜铅锌多金属矿床硫、铅同位素组成及成因意义 总被引：11，自引：0，他引：11
[摘 要] 青海虎头崖铜铅锌多金属矿是东昆仑祁漫塔格成矿带内多金属矿床的典型代表之一。本文对该矿床硫、铅同位素组成进行详细研究,探讨了成矿物质来源和矿床成因。结果表明,该矿床黄铜矿、方铅矿、闪锌矿、黄铁矿等硫化物的δ34S 值变化于+0.6‰～+8.3‰,平均+4.4‰,反映成矿流体中的硫为海水硫酸盐的地层硫和深源岩浆硫的混合硫,而不同矿带硫同位素均值的差别,可能与围岩地层硫的差异及参与程度有关。矿石矿物铅同位素组成总体变化较小(206Pb/204Pb、207Pb/204Pb 和208Pb/204Pb比值分别为18.476～18.688、15.560～15.688 和38.261～38.599),主要分布于造山带和上地壳铅演化线范围内,为岩浆作用导致的上地壳和地幔混合成因。由于赋矿层位及主控矿因素不同,各矿带的矿石铅同位素出现一定的差异。比如滩间山群内6号铜多金属矿点207Pb/204Pb 值和产于岩体与缔敖苏组接触带上的域矿带207Pb/204Pb 值相比,后者的上地壳铅参与程度较高,进一步证明壳幔混合作用对本矿区的影响。该矿床为与岩浆侵入活动密切相关的矽卡岩型铜铅锌多金属矿床。 相似文献
5.
湘西地区铅锌矿成矿物质来源——来自S、Pb同位素的证据 总被引：2，自引：1，他引：1
湘西地区铅锌矿床位于湘西-鄂西成矿带西南段,具有良好的成矿地质背景和控矿条件,有望成为中国最大的铅锌矿基地。S和Pb同位素组成分析结果表明,湘西地区矿床的δ~(34)S值变化范围为6.30‰~34.66‰,平均值为19.64‰,明显富重硫,具有双塔式分布特征,矿石硫主要来源于容矿地层中的海相硫酸盐类和海水。8个矿床矿石矿物的~(206)Pb/~(204)Pb值范围为17.689~18.295,~(207)Pb/~(204)Pb值变化于15.535~18.848之间,~(208)Pb/~(204)Pb值介于37.294~38.630之间。区内铅锌矿床Pb同位素成分具有造山带和上地壳Pb同位素特征,成矿物质来源于造山带和上地壳的混合作用,铅成因类型为上地壳和地幔因岩浆作用而混合的俯冲铅。提出了湘西地区铅锌矿成矿作用的两阶段演化模式,认为区内铅锌成矿作用经历了成矿流体形成和成矿流体迁移富集2个演化阶段。 相似文献
6.
赋存于泥盆系望城坡组白云岩中的乐开铅锌矿床位于扬子地块西南缘川滇黔接壤铅锌矿集区,主要发育似层状矿体,具有典型的“逆(逆断裂)导-张(张断裂)运-岩(受断裂影响的碳酸盐岩破碎空间被碳质黏土岩圈闭形成的有利岩性组合)储”构造控矿模式。矿石矿物主要为闪锌矿、方铅矿、黄铁矿,发育(网)脉状、角砾状、浸染状等构造与交代、充填、共边等结构,后生成矿特征明显。硫化物δ34S值为11.1‰~18.1‰(均值约14.7‰),明显高于幔源岩浆硫的δ34S值,与泥盆纪同期海水硫酸盐的δ34S值相近,显示硫化物中的还原硫可能是赋矿地层中的高溶解度硫酸盐热化学反应(TSR)的产物。硫化物铅同位素206Pb/204Pb值为18.400‰~18.767‰(均值为18.565‰);207Pb/204Pb值为15.660‰~16.058‰(均值为15.791‰);208Pb/204Pb值为38.580‰~39.432‰(均值为39.059‰),变化范围相对较大。铅同位素的207Pb/204Pb-206Pb/204Pb图解与△γ-△β图解显示明显的壳源特征,同时暗示沉积岩石与基底岩石共同提供了成矿物质。综合矿床地质、硫化物硫、铅同位素特征,笔者认为乐开铅锌矿床的成矿过程为盆地流体循环萃取沉积岩石与基底岩石的金属元素后形成含矿流体,含矿流体被深大断裂导入上覆沉积地层的特殊构造部位(被碳质黏土岩圈闭的碳酸盐岩破碎空间)时,富含的热量导致沉积盖层中硫酸盐发生热化学反应(TSR),生成大量的S2-,与含矿流体中的Pb2+、Zn2+、Fe2+等金属阳离子结合成矿。乐开铅锌矿床的地质地球化学特征与MVT型矿床类似,因此,乐开铅锌矿床属于MVT型铅锌矿床。成矿物质来源与矿床类型的确定有利于川滇黔接壤铅锌矿集区同类型铅锌矿床的勘查与开发。 相似文献
7.
川滇黔铅锌多金属成矿域内,碳酸盐岩容矿的热液铅锌矿床多达400个。松梁铅锌矿床地处滇东北与川东南的交接处,位于川滇黔铅锌多金属成矿域的核心部位;铅锌矿体赋存于震旦系灯影组白云岩内,矿体产出明显受断裂控制;矿石矿物组成简单,主要由闪锌矿、方铅矿和黄铁矿组成。文章重点研究了松梁铅锌矿床硫化物的S、Pb、Zn同位素组成,进而探讨了其成矿物质来源及矿床成因。研究表明,松梁铅锌矿床的硫化物δ34SCDT值在+4.6‰~+13.7‰之间,平均值为+10.5‰,显示硫来源于赋矿围岩,为震旦系灯影组硫酸盐经TSR的产物;硫化物的Pb同位素比值为206Pb/204Pb=18.158~18.513、207Pb/204Pb=15.633~15.895、208Pb/204Pb=38.096~38.786,反映成矿物质为壳源铅,源自震旦系灯影组白云岩与结晶基底的混合;闪锌矿的δ66Zn为-0.126‰~+0.082‰,揭示成矿物质可能源自震旦系灯影组碳酸盐岩和结晶基底的混合。松梁铅锌矿床为后生碳酸盐岩容矿型铅锌矿床。 相似文献
8.
驱龙-甲玛-邦铺铜多金属矿集区是西藏冈底斯成矿带上的重要矿集区,铜资源量超过1500万吨。前人研究认为三个矿床成矿物质来源于岩浆,但未讨论不同时代、不同矿化的岩浆岩铅同位素与矿石铅同位素组成的关系,并缺乏从矿集区尺度来分析。本文通过分析已发表的矿石、岩浆岩和地层铅同位素数据,认为驱龙、甲玛、邦铺矿床矿石铅与中新世含矿斑岩铅同位素特征基本一致,区别于与成矿无关的岩浆岩铅同位素组成。空间上,从南西的驱龙,至甲玛,至北东的邦铺,成矿年龄从老到新,铅同位素演化规律明显,放射成因铅递增(矿石206Pb/204Pb平均值18.521→18.644→18.684)。这种铅同位素地球化学特征不仅指示了成矿物质来自岩浆,并可区分与成矿有关和无关的岩浆岩,同时指示了成矿期岩浆岩与成矿关系的密切程度。 相似文献
9.
会泽超大型铅锌矿床位于川滇黔铅锌成矿带的核心部位,矿体主要赋存于下石炭统大埔组白云岩中,少量产于上泥盆统宰格组白云岩中,近年来在深部上震旦统灯影组白云岩中新发现了铅锌矿化线索。本文在详细的野外地质调查与矿相学显微观察的基础上,针对灯影组矿石开展了系统的硫化物微区LA-MC-ICP-MS原位硫、铅同位素分析。结果表明,灯影组矿石的硫同位素值集中于－29.6‰~－22.2‰和+6.3‰~+18.8‰两个变化范围,表明硫主要来自碳酸盐岩地层中海相硫酸盐的热化学还原反应,少量由细菌化学还原反应生成。灯影组矿石的铅同位素比值206Pb/204Pb、207Pb/204Pb、208Pb/204Pb分别介于18.480~18.909、15.714~15.747、38.427~38.959,暗示铅为单一来源或混合较为均一的多源,并具有壳源特征。综合前人研究成果及成矿地质与地球化学特征,本文认为,会泽铅锌矿床应归属于MVT矿床。灯影组矿石的硫、铅同位素组成特征指示会泽铅锌矿床在“新层位”灯影组具有较好的找矿潜力。 相似文献
10.
甘肃厂坝-李家沟铅锌矿床位于西秦岭多金属成矿带内的西成矿集区,为矿集区内重要的超大型铅锌矿床。矿体赋存在中泥盆统安家岔组的白云石化大理岩及石英片岩中,其成因认识一直存在争议,主要分歧集中在是同生还是后生。文章对不同成矿阶段的闪锌矿,采用多接收电感耦合等离子体质谱(MC-ICP-MS)测定Zn同位素组成、采用激光剥蚀-多接收电感耦合等离子体质谱(LA-MC-ICP-MS)原位微区分析技术测定S、Pb同位素组成,示踪成矿物质来源,并分析矿物沉淀机制,为深入理解矿床成因提供新的精细证据。研究结果显示,Ⅰ、Ⅱ、Ⅲ三个成矿阶段闪锌矿的δ66Zn分别为0.08‰~0.29‰,平均0.20‰;0.19‰~0.37‰,平均0.30‰;0.36‰~0.37‰,平均0.37‰。其中,Ⅰ阶段的闪锌矿δ34SⅠ值为20.9‰~26.1‰,平均24.4‰;Ⅱ阶段的闪锌矿δ34SⅡ值为12.2‰~21.9‰,平均19.1‰;Ⅲ阶段的闪锌矿δ34SⅢ值为18.2‰~24.7‰,平均21.5‰。3个阶段的矿石矿物Pb同位素组成变化不大,206Pb/204Pb为17.922~18.013,207Pb/204Pb为15.567~15.647,208Pb/204Pb为37.990~38.266。δ66Zn同位素值显示,成矿金属早期来源于围岩海相碳酸盐岩,由于混合了岩浆热液或者是瑞利分馏作用,在成矿作用中后期δ66Zn同位素逐渐上升。δ34S同位素值显示,早期硫源主要为地层中的硫酸盐,中后期的δ34S同位素值降低,可能是成矿流体中岩浆热液中的S2-成分逐渐增多导致,闪锌矿为硫酸盐通过TSR反应沉淀成矿。Pb同位素指示成矿物质来源于上地壳,并混入了部分古老的变质基底的成分。笔者研究发现,厂坝-李家沟铅锌矿的成矿机制为不同来源的流体混合,随着pH值、成矿流体的温度发生变化而沉淀成矿。 相似文献
11.
Comparison of the Typical Metallogenic Systems in the North Slope of the Tongbai‐East Qinling Mountains and its Geologic Implications 总被引：4，自引：0，他引：4
The Tongbai-East Qinling Mountains, an important part of the Central orogenic belt, is one of the most important metallogenic belts in China and contains lots of orogenic-type and VMS-type (Volcanogenic Massive Sulfide type) metallogenic systems. The Dahe and Shuidongling VMS-type Cu-Zn deposits, located in the Erlangping Group in Tongbai and East Qinling Mountains, respectively, show similar geological and geochemical features. The Huoshenmiao Formation in the East Qinling region and the Liushanyan Formation in the Tongbai region are spilite-keratophyre sequences occurring in the western and eastern sides of the Nanyang Basin, respectively, and are interpreted to be equivalent to each other. The orogenic-type Au-Ag deposits can be subdivided into two styles; namely, fault- or structure-controlled (e.g. Yindonggou) and stratabound (e.g. Poshan). The Poshan and Yindongpo orogenic-type Au-Ag deposits, whose ore bodies are strictly hosted in carbonaceous strata in the Tongbai Mountains, show obvious stratabound characteristics. Their ore-fluids are enriched in K+ and SO42? and are regarded as K+-SO42? types. The Pb-isotope ratios of sulfides of the ores are extremely uniform and significantly different from those of the tectonostratigraphic terranes of the Qinling orogens except for the ore-hosting strata of the Waitoushan Formation. The Yindonggou and Xuyaogou orogenic Au-Ag deposits in the East Qinling Mountains, whose ore bodies are hosted in the faults cutting the hosting strata or granite body, show fault-controlled characteristics. Their ore-fluids belong to the Na+-Cl? type. The Pb-isotope ratios of sulfides of ores are similar to those of the northern Qinling orogenic belt. The Waitoushan Formation, dominated by carbonaceous sericite-rich schists and only occurring in Tongbai region, should be detached from the Erlangping Group, which occurs both in the western and eastern sides of the Nanyang Basin. Future ore exploration in the Tongbai-East Qinling Mountains should focus on fault-controlled Au-Ag lodes. 相似文献
12.
The Yindongpo gold deposit is located in the Weishancheng Au–Ag-dominated polymetallic ore belt in Tongbai Mountains, central China. The ore bodies are stratabound within carbonaceous quartz–sericite schists of the Neoproterozoic Waitoushan Group. The ore-forming process can be divided into three stages, represented by early barren quartz veins, middle polymetallic sulfide veinlets and late quartz–carbonate stockworks, with most ore minerals, such as pyrite, galena, native gold and electrum being formed in the middle stage. The average δ18Owater values changed from 9.7‰ in the early stage, through 4.9‰ in the middle stage, to − 5.9‰ in the late stage, with the δD values ranging between − 65‰ and − 84‰. The δ13CCO2 values of ore fluids are between − 3.7‰ and + 6.7‰, with an average of 1.1‰. The H–O–C isotope systematics indicate that the ore fluids forming the Yindongpo gold deposit were probably initially sourced from a process of metamorphic devolatilization, and with time gradually mixed with meteoric water. The δ34S values range from − 0.3‰ to + 5.2‰, with peaks ranging from + 1‰ to + 4‰. Fourteen sulfide samples yield 206Pb/204Pb values of 16.990–17.216, 207Pb/204Pb of 15.419–15.612 and208Pb/204Pb of 38.251–38.861. Both S and Pb isotope ratios are similar to those of the main lithologies of the Waitoushan Group, but differ from other lithologic units and granitic batholiths in the Tongbai area, which suggest that the ore metals and fluids originated from the Waitoushan Group. The available K–Ar and 40Ar/39Ar ages indicate that the ore-forming process mainly took place in the period of 176–140 Ma, during the transition from collisional compression to extension and after the closure of the oceanic seaway in the Qinling Orogen. The Yindongpo gold deposit is interpreted as a stratabound orogenic-style gold system formed during the transition phase from collisional compression to extension.The ore metals in the Waitoushan Group were extracted, transported and then accumulated in the carbonaceous sericite schist layer. The carbonaceous sericite schist layer, especially at the junction of collapsed anticline axis and fault structures, became the most favorable locus for the ore bodies. 相似文献
13.
西藏冈底斯-念靑唐古拉成矿带典型矿床硫化物Pb同位素特征——对成矿元素组合分带性的指示 总被引：4，自引：0，他引：4
冈底斯-念青唐古拉成矿带矿床成矿元素组合由南向北存在着Cu-Au、Cu-Mo向Pb-Zn-Cu-Fe、Pb-Zn过渡的变化规律,但引起该变化规律的原因目前少研究。本文通过对成矿带典型矿床Pb同位素特征较为系统的总结,并结合成矿年代学和区域构造演化研究成果,从成矿物质来源的角度对该分带性进行了初步探讨。研究表明成矿带由南到北成矿物质来源存在着差异:最南端Cu-Au矿床Pb同位素组成具幔源特征(207Pb/204Pb和208Pb/204Pb平均值分别为15.490和38.016),反映成矿物质来自于俯冲过程中的交代地幔楔;最北端的Pb-Zn矿床Pb同位素组成与念青唐古拉群基底片麻岩相近(207Pb/204Pb和208Pb/204Pb分别变化于15.641～15.738和38.976～39.362),反映成矿物质来自于基底片麻岩。Pb-Zn-Cu-Fe矿床Pb同位素组成介于幔源Pb和上地壳Pb之间,且具混合线特征,反映了同碰撞期成矿物质同时从俯冲板片和念青唐古拉基底片麻岩活化的混源模式;而Cu-Mo矿床不具混合线特征的造山带Pb同位素组成,反映了成矿物质来源于俯冲阶段楔形地幔部分熔融并底侵到地壳底部与地壳发生物质交换后所形成的新生下地壳源区。甲马Cu多金属矿床Pb同位素组成具幔源和造山带两个端元,推测除新生下地壳源区提供成矿物质外,叶巴组火山岩也提供了部分成矿物质。由南向北成矿物质来源的差异很大程度上与板片俯冲的"距离效应"有关,正是由于成矿物质来源的差异导致成矿带成矿元素分带性的形成。 相似文献
14.
15.
ZHANG Jing CHEN Yanjing QI Jinping GE Jun State Key Laboratory of Geological Process Mineral Resources China University of Geosciences Beijing China Key Laboratory of Metallogenic Dynamics Guangzhou Institute of Geochemistry the Chinese Academy of Sciences Guangzhou China 《《地质学报》英文版》2009,83(2)
The Tongbai-East Qinling Mountains,an important part of the Central orogenic belt,is one of the most important metallogenic belts in China and contains lots of orogenic-type and VMS-type (Volcanogenic Massive Sulfide type)metallogenic systems.The Dahe and Shuidongling VMS-type Cu-Zn deposits,located in the Erlangping Group in Tongbai and East Qinling Mountains,respectively, show similar geological and geochemical features.The Huoshenmiao Formation in the East Qinling region and the Liushanyan Formation i... 相似文献
16.
河南省桐柏银洞岭银矿床地质地球化学特征 总被引：6，自引：0，他引：6
银洞岭银矿床属变质碎屑岩型银(金)矿床, 其成矿元素含量变化与歪头山岩组地层层序、岩石类型密切相关, 歪头山岩组下部变粒岩、云母石英片岩Ag含量相对较高, 成为银矿体的直接赋矿围岩;蚀变作用导致成矿元素显著带入, 而对稀土元素的迁移影响不大;成矿热液的运移以渗流作用为主、渗透作用为辅;通过对银洞岭银矿床地质地球化学评价标志的建立, 为该类型矿床的普查评价起到借鉴作用。 相似文献
17.
河南银洞沟造山型银矿床碳硫铅同位素地球化学 总被引：19，自引：8，他引：11
河南内乡县银洞沟大型脉状银多金属矿床产于北秦岭造山带朱夏断裂北侧的二郎坪地体内,含矿围岩是二郎坪群火山岩-碎屑岩建造,矿体定位于断裂构造带内,产状受断裂构造控制,矿石组构、矿物组合、围岩蚀变类型和分带等地质特征均与典型造山型金矿一致,应属造山型银矿.矿床硫化物δ~(34)S介于+4.7～+8.1‰,高于有机物和岩浆岩.流体包裹体中CO_2的δ~(13)C介于-0.2～+0.9‰,与海相碳酸盐一致,高于其它所有地质体.矿石硫化(206)Pb/~(204)Pb=18.2026～18.4462,~(207)Pb/~(204)Pb=15.5835～15.7739,~(208)Pb/~(204)Pb=38.5478～39.0890,显示铀铅富集,钍铅微弱亏损.这些同位素地球化学特征均指示夹杂沉积硫酸盐的碳酸盐-碎屑岩沉积建造是最为理想的物源,对比研究东秦岭北坡相关地质单元,认为成矿物质和流体主要来自二郎坪群和秦岭群,尤其是雁岭沟组含碳酸盐岩地层对于成矿流体和物质的贡献不可替代.中生代华北与华南板块碰撞造山过程中,秦岭群沿朱夏断裂向北陆内俯冲到二郎坪地体之下,并通过俯冲变质脱水而为银洞沟矿床的形成提供了大量成矿物质和流体.朱夏断裂北侧依次出现银洞沟银矿、许瑶沟金矿、松垛隐伏花岗岩基、栾川斑岩钼矿带,构造-成岩-成矿空间格局与CMF模式(碰撞造山成岩成矿和流体作用模式)完全一致,证明了CMF模式的科学性和普适性和同位素示踪成矿物质和流体来源的有效性.银洞沟矿床的发现和研究结果证实了前人预测的朱夏断裂北侧"桑坪-米坪-许瑶沟铜金铅锌银等多金属矿化带"的客观存在,该带应作为银金多金属矿床勘查的重点区带. 相似文献
18.
The Heilangou gold deposit is located in the northern QixiaePenglai gold belt, which is one amongst the three large gold belts in the eastern Shandong Province （Jiaodong Peninsula）. The ore body has formed within the Guojialing granite. In this study, we report the mineral chemistry of pyrite, as well as the S, Pb, and HeO isotope data of the Heilangou gold deposit. The chemical composition of pyrite in the Heilangou gold deposit indicates that the associated gold deposit is a typical magmatic hydrothermal one. The geochemical signatures and crystal structure of pyrite show that the ore-forming materials have been derived from the crust. The S isotope data of the pyrites from Heilangou show an overall range from 5.5 to 7.8＆amp;and an average of 6.7＆amp;. The S isotope data in this deposit are similar to those from the deposits in the Jiaodong gold belt. The Pb and S isotope variations are small in the Heilangou gold deposit. The 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratios are 17.4653e17.5958, 15.5105e15.5746 and 38.0749e38.4361, respec-tively. These data plot between the lower crust and the orogenic belt. The Pb isotope data in the Heilangou gold deposit are similar to those in the Linglong gold deposit. From the Qixia gold area （the Liukou and Majiayao gold deposits） to the MupingeRushan gold belt （Rushan gold deposit） to the ZhaoeYe gold belt （the Linglong, Sanshandao and Jiaojia gold deposits）, the 206Pb/204Pb ratios progressively increase. The DeO isotope data obtained from quartz separates suggest that the ore-forming fluid was similar to a mixture of magmatic and meteoric waters. These results suggest that the ore-forming elements were primarily from source fluids derived from the lower crust. 相似文献
19.
河南破山银矿床地质地球化学特征及成因研究 总被引：5，自引：0，他引：5
破山特大型银矿床位于桐柏围山城金银多金属矿带的西端。矿床赋存在新元卉界歪头山组上部的炭质绢云石英片岩中,矿体产出受地层和褶皱构造双重控制,多呈似层状、脉状和透镜状,矿石以蚀变岩型矿石为主。成矿流体属于中温、低盐度、低密度、富CO2的K^＋-SO4^2-型流体,成矿早中阶段以变质流体为主,晚阶段逐渐演化为以大气水为主。成矿物质主要来自于歪头山组地层。热液绢云母和云煌岩脉的钾氩年龄分别为103．6Ma和134Ma,指示矿床形成于早白垩世,即秦岭一桐柏地区的构造环境从挤压向伸展转变的构造背景下。 相似文献