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1.
详细的流体包裹体研究表明．正岔矿床矿物中流体包裹体十分丰富．主要有G型富气体包裹体、P型多相包裹体和F型两相气液包裹体。矽卡岩阶段(尤其是早期)以发育P型包裹体为特征，其内子晶种类多、体积大；成矿高峰期的石英-硫化物阶段F型包裹体最多，少数G型；成矿晚期石英-方解石阶段包裹体数量少，主要为气液比小的富液相包裹体．通过包裹体的低温试验和成分分析得出，本区成矿液体有两类：①高温度、高盐度、高密度含CaCl3、MgCl3、KCl的NaKCl-H2O溶液，来自岩浆热液；②低温度、低盐度、低密度NaCl-H2O溶液，来自大气降水．成矿早期以岩浆热液为主；晚期大气降水占优势。成矿作用温度范围为180-640℃；矽卡岩阶段为280-640℃,成矿的最佳温度为260-400℃。成矿压力为5-20MPa，当流体沸腾、盐度为7-12WNaCl%、密度为0．5-0．8(g／cm^3)时对成矿最有利。 相似文献
2.
详细的流体包裹体研究表明．正岔矿床矿物中流体包裹体十分丰富．主要有G型富气体包裹体、P型多相包裹体和F型两相气液包裹体。矽卡岩阶段(尤其是早期)以发育P型包裹体为特征，其内子晶种类多、体积大；成矿高峰期的石英-硫化物阶段F型包裹体最多，少数G型；成矿晚期石英-方解石阶段包裹体数量少，主要为气液比小的富液相包裹体．通过包裹体的低温试验和成分分析得出，本区成矿液体有两类：①高温度、高盐度、高密度含CaCl3、MgCl3、KCl的NaKCl-H2O溶液，来自岩浆热液；②低温度、低盐度、低密度NaCl-H2O溶液，来自大气降水．成矿早期以岩浆热液为主；晚期大气降水占优势。成矿作用温度范围为180-640℃；矽卡岩阶段为280-640℃,成矿的最佳温度为260-400℃。成矿压力为5-20MPa，当流体沸腾、盐度为7-12WNaCl%、密度为0．5-0．8(g／cm^3)时对成矿最有利。 相似文献
3.
西藏南木斑岩铜钼矿床的流体包裹体研究 总被引：15，自引：2，他引：15
南木斑岩铜钼矿床是西藏冈底斯东段铜多金属成矿带中的典型斑岩矿床。流体包裹体研究显示与成矿有关的包裹体可以分为液相包裹体、气相包裹体和含子晶多相包裹体三类，它们的均一温度为315～526℃，盐度变化大，含石盐子矿物包裹体的盐度ω(NaCleq)33．1％～52．98％。激光拉曼探针成分分析表明，黄铜矿等子矿物相存在于高盐度包裹体中，部分液相包裹体和气相包裹体含有一定量的CO2。含子矿物包裹体与液相包裹体、气相包裹体共存．且均一温度相近，盐度相差很大，表明成矿流体经历了沸腾作用。成矿流体是富含成矿金属元素的高盐度、高温岩浆流体，岩浆热液提供了主要金属物质。 相似文献
4.
赛博铜多金属矿位于西天山赛里木湖—四台海泉铜铅锌成矿带内,是该区域新突破的中-大型铜矿床.通过光薄片鉴定及流体包裹体分析得出,该矿床矽卡岩化发育,成矿期次可划分为退蚀变矽卡岩阶段(S1)、石英-硫化物阶段(S2)和石英.碳酸盐阶段(S3);包裹体类型为纯液相Ⅰ型、富液两相Ⅱa型、富气两相Ⅱb型、含子矿物Ⅲa型(含石盐子晶)和含子矿物Ⅲb型包裹体(不含石盐子晶);成矿流体显示初期以高温、高盐度,金属物质少量出现,成矿期大气降水混入,温度、盐度逐渐降低,流体沸腾、金属物质大量析出,再至晚期温度、盐度衰减并发育碳酸盐化的演化过程.C-H-O同位素显示,成矿流体早期以初始岩浆水为主,晚期以大气降水为主.S、Pb同位素表明成矿物质为壳-幔混源.总体上,赛博铜多金属矿是形成于活动陆缘岩浆弧环境的典型钙矽卡岩型矿床. 相似文献
5.
邹平地区与火山岩浆热液作用有关的铜矿床主要可划分为2种类型：一类为斑岩-火山角砾岩型,另一类为浅成低温热液型;代表性矿床分别为王家庄斑岩一火山角砾岩型铜（钼）矿床和南洞子浅成低温热液型铜（金）矿床。流体包裹体研究表明：王家庄铜（钼）矿床成矿流体的均一化温度和盐度偏高,出现了富气相的两相水溶液包裹体、富液相的两相水溶液包裹体和含子晶的三相水溶液包裹体共存现象,加温后,富气相包裹体均一到气相,同期富液相包裹体均一到液相的特征,这表明成矿流体在形成和演化过程中曾发生过沸腾作用。南洞子铜（金）矿床成矿流体均一温度和盐度偏低,以上3种包裹体共存的现象不明显,说明成矿流体在形成和演化过程中沸腾作用不强。上述2类矿床矿化脉石英中的δ^18OH2O-δD投影点飘离岩浆水范围,参照流体包裹体研究结果,证明邹平地区与火山岩浆热8液作用有关的铜矿成矿流体主要来源于岩浆水,后期混人大气降水。相比之下,浅成低温热液铜矿成矿流体中的大气降水混入量多。 相似文献
6.
江西武山铜矿床是长江中下游多金属成矿带内重要的矽卡岩型矿床之一。文章对该矿床中的流体包裹体进行了详细研究,重点分析了成矿流体的演化过程及其成矿意义。根据野外地质产状和室内岩相学特征,将武山矽卡岩型铜矿床热液成矿过程分为气成-高温热液期和热液期,前者包括矽卡岩阶段和磁铁矿阶段,后者包括石英-硫化物阶段和碳酸盐阶段。其中,石英-硫化物阶段是该铜矿形成的主要阶段,可进一步细分为辉钼矿-石英和黄铁矿-黄铜矿-石英2个阶段。岩相学观察显示,包裹体类型有Ⅰ型含子矿物包裹体(L+V+S)、Ⅱ型气液两相包裹体(L+Ⅴ)和Ⅲ型气相包裹体(Ⅴ)。气成-高温热液期的石榴子石中流体包裹体数量不多,但Ⅰ型、Ⅱ型和Ⅲ型包裹体都有;而热液期的石英与方解石中流体包裹体数量众多,以Ⅱ型包裹体为主。从早期矽卡岩阶段至碳酸盐阶段,成矿热液经历了从高温(378~518℃)、高盐度[ω(NaCl_(eq))介于17.3%~45.1%)向低温(113~250℃)、低盐度[ω(NaCl_(eq))介于3.4%~11.9%]的持续演化。热液演化过程中发生了流体沸腾作用和岩浆热液与大气降水的混合作用。其中,矽卡岩阶段的水-岩作用、沸腾作用与矽卡岩的形成密切相关,而成矿阶段的沸腾作用与混合作用可能是铜矿床形成的重要机制。H、O同位素研究表明,各成矿阶段的成矿流体以岩浆水为主,但随着成矿作用的进行,大气降水在成矿流体中的体积质量逐渐增大。 相似文献
7.
安庆铜铁矿床是长江中下游成矿带内重要的矽卡岩型矿床之一。本文对该矿床中的成矿流体进行了系统研究,分析
了成矿流体性质、来源及其演化过程,探讨了成矿机制。流体包裹体岩相学观察显示,矿床中的包裹体类型有Ⅰ型含子矿
物三相包裹体（L+V+S）、Ⅱ型气液两相包裹体（L+V）及少量Ⅲ型气相包裹体（V）;气成- 高温热液期的透辉石与石榴子
石中流体包裹体数量相对较少,以Ⅰ型包裹体为主;而热液期的石英与方解石中流体包裹体大量发育,以Ⅱ型包裹体为主。
激光拉曼探针分析和流体包裹体显微测温结果表明,成矿流体可近似地看作不饱和的NaCl-H2O 体系。从早矽卡岩阶段至碳
酸盐阶段,成矿流体经历了从高温（456.1~578.1℃）、高盐度（39.37%~54.58% NaCleq）向低温（112.3~312.4℃）、低盐度（7.59%~31.75% NaCleq）的持续演化。演化过程中经历了流体沸腾作用和岩浆热液与大气降水的混合作用,其中,早矽卡岩阶段的水- 岩作用、沸腾作用与矽卡岩成岩作用有关,水- 岩作用,而石英- 硫化物阶段的沸腾作用与混合作用可能是铜矿形成
的重要机制。氢、氧同位素研究表明气成- 高温热液期的成矿流体以岩浆水为主,而在热液期中石英- 硫化物阶段至碳酸
盐阶段大气降水在成矿流体中的比重逐渐增大。 相似文献
8.
安徽铜陵胡村南铜钼矿床流体成矿过程 总被引：1，自引：0，他引：1
胡村南铜钼矿床是在安徽铜陵铜(金)矿集区中发现的第一个矽卡岩-斑岩复合型铜钼矿床,在长江中下游成矿带具有特殊性和典型性。文章对该矿床进行了矿床地质和流体包裹体研究,旨在查明该矿床的流体成矿过程。胡村南铜钼矿床流体成矿过程可以划分为高温气成热液期、中高温热液期和低温热液期3个成矿期。高温气成热液期发育钾长石化和矽卡岩化,中高温热液期发育绿泥石化、绿帘石化和绢云母化,而低温热液期主要发育碳酸盐化。其中,中高温热液期为主要矿化期,形成辉钼矿和黄铜矿等多种硫化物网脉。高温气成热液期矿物中发育富液相和含子晶多相包裹体,中高温热液期矿物中也主要发育富液相包裹体和含子晶多相包裹体,但可见少量的富气相包裹体,低温热液期矿物中只发育富液相包裹体。从高温气成热液期经中高温热液期到低温热液期,成矿流体均一温度从435℃以上,经203~458℃,降低到156~276℃;盐度w(NaCleq)从14.0%~64.9%,经4.6%~47.5%,降低到1.0%~15.5%。成矿流体在其演化过程中发生过不混溶作用和沸腾作用。不混溶作用发生在气成热液期,使成矿流体中的成矿元素大量富集。沸腾作用发生在中高温热液期,导致成矿流体中的成矿元素卸载而沉淀出大量金属硫化物。 相似文献
9.
内蒙古维拉斯托铜多金属矿床流体包裹体研究 总被引：4，自引：2，他引：2
对内蒙古维拉斯托铜多金属矿床地质特征、流体包裹体和氢、氧同位素的研究表明,成矿具有多阶段性,根据矿脉穿插关系和矿石结构构造特征可以分为4个阶段:石英-黄铁矿阶段、多金属硫化物阶段、黄铜矿-磁黄铁矿-石英阶段和石英-碳酸盐阶段。流体包裹体类型以富液相包裹体为主,含有少量富气相包裹体和含子矿物包裹体以及含CO2三相包裹体。包裹体形态多为椭圆形、负晶形或近圆形,数量较多,呈不规则分布。均一温度变化区间为106~389℃,盐度为1.23%~9.86%NaCl eqv.,显示成矿流体具有中温、低盐度和低密度的特点。激光拉曼光谱分析包裹体成分主要为CO2、CH4和H2O。氢、氧同位素分析结果表明成矿热液是岩浆水和大气降水的混合作用来源。综合对比研究认为,维拉斯托铜多金属矿床与该区燕山期中酸性岩浆活动密切相关,为深部岩浆在上升过程中与下渗的大气降水发生混合,矿质在构造有利部位沉淀富集的结果。矿床为与燕山期岩浆活动有关的中温热液矿床。 相似文献
10.
甘肃天祝干沙鄂博稀土矿床产于霓辉正长岩和霓辉正长斑岩中,矿体形态呈不规则脉状、透镜状和板状。成矿过程可分为岩浆期、岩浆-热液期、热液期和表生期,其中岩浆-热液期为主要成矿期。本矿床中的包裹体有熔体包裹体、流体-熔体包裹体、H_2O包裹体、CO_2包裹体、CO_2-H_2O包裹体、含子矿物H_2O包裹体和含子矿物CO_2-H_2O包裹体7类,并以富含流体-熔体包裹体、CO_2-H_2O包裹体为显著特征。包裹体组合从熔体包裹体→流体-熔体包裹体、H_2O包裹体、CO_2包裹体和CO_2-H_2O包裹体→H_2O包裹体的变化,反映本矿床的形成经历了从岩浆→岩浆+热液→热液的演化过程。岩浆期熔体包裹体均一温度为780℃;岩浆-热液期均一温度为191~700℃,盐度为5.26%~22.24%,属中低盐度,成矿压力为68~95 MPa,相应的成矿深度为2.6~3.6 km;热液期均一温度为129~225℃,盐度为0.35%~7.73%,为低盐度。从岩浆期到岩浆-热液期再到热液期,温度逐渐降低,矿化作用主要发生在岩浆-热液期,属中高温、中深成岩浆-热液过渡型矿床。 相似文献
11.
岩浆热液出溶和演化对斑岩成矿系统金属成矿的制约 总被引：29，自引：1，他引：29
岩浆热液过渡阶段对于与岩浆热液有关矿床的形成非常重要。以往的研究多侧重于岩浆结晶阶段和低于固相线的热液阶段过程和演化 ,但对于流体从熔体出溶到熔体最后固结过程的理解却很有限。基于流体包裹体冷热台研究、单个流体和熔体包裹体原位无损成分分析技术 ,并结合挥发份和成矿元素在共存相间分配的实验和质量平衡计算模拟 ,岩浆热液出溶和演化对金属成矿制约的研究取得了很大进展。文中从岩浆中挥发份的出溶和演化、成矿元素在岩浆热液过渡体系各相之间的分配、斑岩矿床成矿流体及与金属成矿的关系、浅成热液矿床成矿流体及与金属成矿的关系几个方面进行了阐述。研究表明 :( 1)岩浆熔体不仅含有足够的挥发性组分 ,而且出溶的挥发份能够被圈闭在流体包裹体中而成为岩浆出溶热液的实物证据。 ( 2 )挥发份和成矿元素不仅在岩浆熔体和出溶的溶液间分配 ,还将在熔体与盐水溶液、熔体与气相以及盐水溶液与气相间进行分配。Cu在岩浆蒸气中比在共存的熔体中要富集数百倍 ,而Cu ,As,Au(可能作为HS配合物 )则偏向于分配进入与液体相共存的蒸气相中。 ( 3 )成矿元素在熔体 /溶液间的分配系数受控于熔体中初始水含量与饱和水含量之比值和岩浆熔体与共存出溶水溶液的w(Cl) /w(H2 O)和w(F) /w(Cl)比值。 ( 4 )斑岩 相似文献
12.
江西银山多金属矿床高盐度包裹体及其成因意义 总被引：13，自引：1，他引：13
流体包裹体岩相学和显微测温学研究表明，银山矿床石英斑岩和金金属矿床中都发现须含石盐的高盐度流体包裹体，表明至少在成矿作用的早期成矿流体为高盐度流体，高盐度流体不是由热水溶液的不混溶作用或沸腾作用形成的，而是直接从饱和水的结晶岩浆熔体中出溶的，银山矿床的成矿流体与斑岩铜矿的成矿流体具有相似性，证实矿床深部可能有隐伏斑岩铜矿。 相似文献
13.
大兴安岭锡矿带是中国北方唯一成型的锡多金属成矿带。新近发现的内蒙古维拉斯托锡多金属矿床位于大兴安岭南段,隶属中亚造山带东段的兴蒙造山带。该矿床为一典型的大型斑岩型热液脉型锡多金属矿床,矿区内锡矿化主要赋存于石英斑岩体顶部及其上部的石英脉中。矿床成矿阶段包括石英斑岩体内的滴状锡锌矿化阶段、石英斑岩体上部石英脉中的辉钼矿矿化阶段、石英锡石黑钨矿阶段和石英多金属硫化物阶段。流体包裹体研究结果显示：流体包裹体类型主要为气液两相包裹体,尤其是富液相包裹体,其次为含子矿物的三相包裹体。斑岩体内矿化阶段流体包裹体均一温度为324~333 ℃,盐度为6.5%~7.5% NaCleqv,密度为0.73~0.74 g/cm3;石英脉型矿化阶段包裹体均一温度为201~324 ℃,盐度为3.4%~9.9% NaCleqv,密度为0.73~0.92 g/cm3。包裹体显微测温分析结果显示该矿区成矿流体具有中高温、低盐度、中密度的特征。激光拉曼光谱分析表明,气液两相包裹体液相成分主要为H2O,气相成分主要有H2O、CO2和CH4。氢氧同位素研究结果表明该矿床石英斑岩体上部石英脉矿化阶段的成矿流体为岩浆水和大气降水混合来源,以岩浆水为主。岩浆流体与大气降水的混合以及流体演化中的降温过程是该矿床矿石沉淀的主要机制。 相似文献
14.
云南普朗斑岩型铜矿床成矿流体特征及矿床成因 总被引：3，自引：0，他引：3
普朗铜矿床为滇西北地区一超大型斑岩型铜多金属矿床,它产于印支晚期石英闪长玢岩-石英二长斑岩-花岗闪长斑岩复式侵入体内,已有研究表明其形成于印支期。本次流体包裹体岩相学、显微测温及碳、氢、氧同位素综合研究表明:黄铜矿±黄铁矿-石英脉石英中主要发育含NaCl子矿物三相、气液两相及富气相3种类型的包裹体,成矿流体属中高温、高盐度(w(NaCl))NaCl-H2O热液体系,来源于印支晚期岩浆活动;辉钼矿±黄铜矿-石英脉石英中发育含NaCl子矿物三相、气液两相及含CO2 3种类型的包裹体,成矿流体属中高温、高盐度NaCl-CO2-H2O热液体系,推测来源于后期岩浆活动;晚期黄铜矿±辉钼矿-方解石脉中主要发育气液两相包裹体,成矿流体为中低温、低盐度NaCl-H2O热液体系,系NaCl-CO2-H2O型成矿流体演化产物。据此,结合区域广泛叠加发育燕山期斑岩钼矿化成矿背景,提出普朗超大型斑岩矿床可能存在燕山期Mo、Cu成矿作用叠加的认识。 相似文献
15.
Phase equilibria in the system H2O-NaCl have been determined to 1000°C and 1500 bars using synthetic fluid inclusions formed by healing fractures in inclusion-free Brazilian quartz in the presence of the two coexisting, immiscible H2O-NaCl fluids at various temperatures and pressures. Petrographic and microthermometric analyses indicate that the inclusions trapped one or the other of the two fluids present, or mixtures of the two. Salinities of the two coexisting phases were obtained from heating and freezing studies on those inclusions which trapped only a single, homogeneous fluid phase.Results of the present study are consistent with previously published data on the H2O-NaCl system at lower temperatures and pressures, and indicate that the two-phase field extends well into the P-T range of most shallow magmatic-hydrothermal activity. As a consequence, chloride brines exsolved from many epizonal plutons during the process of “second-boiling” should immediately separate into a high-salinity liquid phase and a lower salinity vapor phase and produce coexisting halite-bearing and vapor-rich fluid inclusions. This observation is consistent with results of numerous fluid inclusion studies of ore deposits associated with shallow intrusions, particularly the porphyry copper deposits, in which halite-bearing and coexisting vapor-rich inclusions are commonly associated with the earliest stages of magmatic-hydrothermal activity. 相似文献
16.
深源富碱硅热流体与斑岩铜矿含矿斑岩体的成因联系及流体包裹体、斑晶结构证据 总被引：6，自引：0，他引：6
通过中国几个主要斑岩铜矿含矿斑岩体中斑晶结构及斑晶中流体包裹体的详细研究得出 :斑岩体中的斑晶具明显的包含、筛状、间隙、聚合及次生加大等变斑晶结构。斑晶 (石英 )中流体包裹体具有饱和及过饱和盐水蒸气沸腾流体包裹体组合的特征 ,缺乏熔融包裹体。该沸腾流体包裹体组合(全岩 )中过饱和盐水包裹体占 2 9% ,饱和盐水包裹体占 2 % ,不饱和盐水包裹体占 4 5 % ,气相包裹体占 2 4 %。根据饱和盐水包裹体的均一温度确定斑晶的形成温度区间为 3 11～ 4 0 7℃。流体包裹体的成分主要为H2 O ,CO2 ,K+,Na+,Cl-,SO2 -4等 ,从而进一步论证了斑岩铜矿中含矿斑岩体并非岩浆直接结晶的产物 ,而很可能是由深部富K ,Na ,Si的热流体交代或局部熔融上部含Cu硅酸盐地壳的结果。 相似文献
17.
The Middle–Lower Yangtze River Valley is one of the most important metallogenic belts in China, hosting numerous Cu–Fe–Au–Mo deposits. The Taochong deposit is located in the northern part of the Fanchang iron ore district of the Middle–Lower Yangtze River metallogenic belt. The Fe-orebody is hosted by Middle Carboniferous to Lower Permian limestones. Skarns and Fe-orebodies occur as tabular bodies along interlayer-gliding faults, at some distance from the inferred granitic intrusions. Field evidence and petrographic observations indicate that the three stages of hydrothermal activity—the skarn, iron oxide (main mineralization stage), and carbonate stages—all contributed to the formation of the Taochong iron deposit. The skarn stage is characterized by the formation of garnet and pyroxene, with high-temperature, hypersaline hydrothermal fluids with isotopic compositions similar to those of typical magmatic fluids. These fluids were probably generated by the separation of brine from a silicate melt instead of the product of aqueous fluid immiscibility. The iron oxide stage coincides with the replacement of garnet and pyroxene by actinolite, chlorite, quartz, calcite and hematite. The hydrothermal fluids at this stage are represented by saline fluid inclusions that coexist with vapor-rich inclusions with anomalously low δD values (− 66‰ to − 94‰). The decrease in ore fluid δ18Owater with time and decreasing depth is consistent with the decreases in fluid salinity and temperature. The fluid δD values also show a decreasing trend with decreasing depth. Both fluid inclusion and stable isotopic data suggest that the ore fluid during the main period of mineralization was evolved by the boiling of various mixtures of magmatic brine and meteoric water. This process was probably induced by a drop in pressure from lithostatic to hydrostatic. The carbonate stage is represented by calcite veins that cut across the skarn and orebody, locally producing a dense stockwork. This observation indicates the veins formed during the waning stages of hydrothermal activity. The fluids from this stage are mainly represented by a variety of low-salinity fluid inclusions, as well as fewer high-salinity inclusions. These particular fluids have the lowest δ18Owater values (− 2.2‰ to 0.4‰) and a wide of range of δD values (− 40‰ to − 81‰), which indicate that they were originated from a mixture of residual fluids from the oxide stage, various amounts of meteoric water, and possibly condensed vapor. Low-temperature boiling probably occurred during this stage.We also discuss the reasons behind the anomalously low δD values in fluid inclusion water extracted by thermal decrepitation from quartz at high temperatures, and suggest that calcite data provide a possible benchmark for adjusting low δD values found in quartz intergrown with calcite. 相似文献
18.
Abstract. The occurrence of a distinct type of multi-solid, highly-saline fluid inclusions, hosted in igneous quartz phe-nocrysts from the Llamo porphyry, in the Zaldivar porphyry copper deposit of northern Chile is documented. Total homoge-nization of the multi-solid type inclusions occurs at magmatic temperatures (over 750C), well above the typical temperatures of hydro thermal fluids (less than 600C) usually recorded in porphyry copper systems. The analysis of this type of fluid inclusions, using a combination of non-destructive microthermometry, Raman and PIXE techniques and the identification of daughter minerals by SEM method, indicates that the trapped fluid was a dense, complex chloride brine in which Cl, Na, K, Fe, Cu, and Mn are dominant. The high chlorine and metal contents indicate that the metals were separated from the crystallizing magma as homogeneous aqueous chloride-rich solutions that represent the primary magmatic fluids exsolved at high temperatures and depth during the crystallization of the parental intrusive.
The multi-solid type inclusion illustrates the mechanism by which ore components are sequestered from the crystallizing parental magma and concentrated in the exsolved magmatic aqueous fluids. These fluids are significant with respect to the origin of porphyry copper deposits, as they are responsible for the first enrichment of metals and represent the precursors of metal-bearing hydrothermal fluids in a porphyry copper system. 相似文献
The multi-solid type inclusion illustrates the mechanism by which ore components are sequestered from the crystallizing parental magma and concentrated in the exsolved magmatic aqueous fluids. These fluids are significant with respect to the origin of porphyry copper deposits, as they are responsible for the first enrichment of metals and represent the precursors of metal-bearing hydrothermal fluids in a porphyry copper system. 相似文献
19.
Jingwen Mao Jiandong Zhang Franco Pirajno Daizo Ishiyama Huimin Su Chunli Guo Yuchuan Chen 《Ore Geology Reviews》2011,43(1):203-216
Based on previous studies and detailed field investigations of the Dexing porphyry copper deposit, the Yinshan Ag-Pb-Zn deposit and the Jinshan shear zone – hosted gold deposit in the Dele Jurassic volcanic basin, in the northeastern Jiangxi province, East China, we propose that the three deposits share spatial, temporal and genetic relationships and belong to the same metallogenic system. Dexing is a typical porphyry Cu–Au–Mo deposit in which both ore-forming fluid and metals are derived from the granite porphyry. The Yinshan deposit consists of a porphyry copper ore located in the cupola of a quartz porphyry stock, in the lower part, and Ag–Pb–Zn ore veins in the upper part. The hydrothermal fluids were mainly derived from the magma in the early stages of the mineralizing event and became mixed with meteoric waters in the late stages. Its ore metals are magma-derived. Both the Jinshan base metal veins and the Hamashi, Dongjie and Naikeng quartz vein-type gold deposit are hosted by brittle–ductile structures, which are distal in relation to the porphyry intrusions and were formed by mixed magmatic fluids and meteoric water, whereas the gold was mainly leached from the country rocks (Mesoproterozoic Shuangqiaoshan Group phyllite and schist). The deposits show a distinct spatial arrangement from porphyry Cu, to epithermal Ag–Pb–Zn and distal Au. We suggest a porphyry–epithermal–distal vein ore system model for this group of genetically related mineral deposits. They were formed in a back-arc setting in a Middle Jurassic active continental margin, with magmas derived from the subducted slab. 相似文献