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本文系统地研究了锡矿山锑矿床的围岩、蚀变围岩和热液成因方解石的碳、氧同位素组成。研究表明，相对于区域地层，矿区灰岩明显亏损^18O；围岩蚀变过程中，围岩的δ^18O值趋于减小并有明显的空间变化趋势。不同期次方解石的碳、氧同位素特征明显不同：成矿早期显示出深特征；成矿晚期方解石的碳、氧同位素组成呈正相关，为水－岩反应和温度降低耦合作用所致；成矿期后方解石的碳、氧同位素组成呈明显的负相关，这种方解石的沉淀介质成成矿流体明显不同。水－岩反应的理论模拟显示，成矿流体不可能为未经深部循环的大气降水；成矿流体中的可溶性碳以H2CO3为主；早期成矿流体的δ^13C、δ^18O分别为－6‰、＋10‰，晚期成矿流体的δ^13C、δ^18O分别为0‰、4‰。 相似文献
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湖南锡矿山锑矿床是目前世界上已发现的最大的锑矿床,其硅化非常发育且与矿化关系密切,根据硅化蚀变程度的强弱,从围岩到矿石大致划分为4个带:灰岩→弱硅化灰岩→强硅化灰岩→矿石。为揭示锡矿山锑矿的成矿过程及成矿流体信息,利用Isocon标准化方法,以Al_2O_3为惰性组分,对各蚀变带围岩及矿石的主、微量元素进行质量平衡计算。结果表明,热液蚀变过程中,Si、Sb、Li和Bi等大量迁入,而Ca、Mg、Na和大离子亲石元素Sr、Ba、Rb等大量迁出;成矿热液呈酸性并富硅,其中Hg、As、Au、Tl等元素含量极低,这可能是导致锡矿山锑矿床矿种单一的原因之一。稀土元素除Eu外,其他元素未发生明显的活化迁移,水岩反应并未影响原岩的稀土元素配分模式;蚀变岩及矿石中的Eu负异常可能表明成矿过程是在相对还原的环境下进行的。 相似文献
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对湘中盆地热液方解石和灰岩的微量元素研究显示,盆地盖层地层中矿床热液方解石的稀土元素含量特征更多受流体本身控制。锡矿山锡矿的方解石相对富集Sb,但严重亏损Pb和Zn,而禾青铅锌矿的方解石,相对富集Pb、Zn和Sb,且两者的稀土元素特征差异明显,说明禾青铅锌矿与锡矿山锡矿是两种成分差异较大的流体,可能是同源成矿流体演化的不同阶段。基底和盖层中蚀变灰岩的微量元素特征,指示湘中盆地成矿流体为深循环古流体,即深循环热流体从基底地层中萃取Cu、Zn、Pb和Sr等元素,经历再循环到盖层的演化过程。同样方解石和围岩灰岩的稀土元素特征,指示研究区在基底和盖层形成了不同深循环流体,分别淋虑基底和盖层,在深部岩浆热驱动下形成成分差异的热流体,其中基底热流体相对经历了长期和远距离的萃取-迁移-沉淀过程,导致湘中盆地成矿元素形成垂向上的分带。本研究进一步印证和完善了基底-盖层成矿系统成矿模型,有利于认识湘中盆地大规模流体成矿作用及精细成矿过程。 相似文献
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对湘中盆地热液方解石和灰岩的微量元素研究显示,盆地盖层地层中矿床热液方解石的稀土元素含量特征更多受流体本身控制。锡矿山锡矿的方解石相对富集Sb,但严重亏损Pb和Zn,而禾青铅锌矿的方解石,相对富集Pb、Zn和Sb,且两者的稀土元素特征差异明显,说明禾青铅锌矿与锡矿山锡矿是两种成分差异较大的流体,可能是同源成矿流体演化的不同阶段。基底和盖层中蚀变灰岩的微量元素特征,指示湘中盆地成矿流体为深循环古流体,即深循环热流体从基底地层中萃取Cu、Zn、Pb和Sr等元素,经历再循环到盖层的演化过程。同样方解石和围岩灰岩的稀土元素特征,指示研究区在基底和盖层形成了不同深循环流体,分别淋虑基底和盖层,在深部岩浆热驱动下形成成分差异的热流体,其中基底热流体相对经历了长期和远距离的萃取-迁移-沉淀过程,导致湘中盆地成矿元素形成垂向上的分带。本研究进一步印证和完善了基底-盖层成矿系统成矿模型,有利于认识湘中盆地大规模流体成矿作用及精细成矿过程。 相似文献
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江苏栖霞山铅锌多金属矿床深部碳-氧-锶同位素地球化学特征及其指示意义 总被引：1，自引：0，他引：1
以栖霞山铅锌多金属矿床深部找矿钻孔岩心为对象,开展碳-氧-锶同位素地球化学研究。结果表明,栖霞山矿床矿石样品δ13CV-PDB同位素值为-5.1‰～1.9‰,且由浅部至深部,矿石样品的δ13C、δ18O值处于增大的趋势,指示成矿流体中的碳起源于碳酸盐岩、源自地幔和岩浆的深源碳。对锶同位素的研究显示,栖霞山矿石~(87)Sr/~(86)Sr值为0.704816～0.71405,部分大于矿体围岩黄龙组灰岩的~(87)Sr/~(86)Sr值(0.708329～0.709685),部分小于矿体围岩黄龙组灰岩的~(87)Sr/~(86)Sr值,并与不同来源的Sr同位素对比,揭示栖霞山矿石中Sr兼具基底地层Sr和幔源Sr的混合来源特征,且在围岩蚀变过程中~(87)Sr/~(86)Sr的变化应主要由成矿流体引起。结合本区成矿地质特征认为,栖霞山矿床成矿流体可能来自花岗岩的期后热液,在热动力作用下,流经元古宇基底地层,形成具有混合物质来源的成矿流体,成矿作用过程主要为成矿流体与围岩碳酸盐岩发生水-岩反应所致。 相似文献
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通过对Kashan区块上库姆组碳酸盐围岩与裂缝或晶洞充填方解石的^87Sr／^86Sr，δ^18O和δ^13C对比研究，确定含烃流体的可能来源。裂缝或晶洞充填方解石的^87Sr／^86Sr，δ^18O／‰（PDB）和δ^18O／‰（PDB）分别为：0．7074～0．7087，-12．7～-6．214和0．630～1．883。方解石的。^87Sr／^86Sr，δ^18O特征和流体包裹体较高的均一温度（120℃～217℃），说明舍烃流体为来自休罗系Shemshak组的贫锶贫氧流体（^87Sr／^86Sr=0．7074，δ^18OPDB=-12．17‰）、富锶富氧流体（^87Sr／^86Sr=0．7087，δ^18OPDB=-6．214‰）及这两种流体混合形成的混合流体。 相似文献
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湖北徐家山锑矿床方解石C、O、Sr同位素地球化学 总被引：4，自引：0，他引：4
湖北通山的徐家山锑矿床产在上震旦统陡山沱组和灯影组的海相碳酸盐岩中.对该矿床中成矿前和成矿期方解石进行了较系统的C、O、Sr同位素地球化学研究,结果表明,成矿前方解石具相对较高的δ13CPDB(-0.7‰～ 2.0‰)、δ18OSMOW( 18.6‰～ 19.6‰)和Sr含量(2645-8174 μg/g,平均5656μg/g),及较低的87Sr/86Sr比值(0.7096～0.7097);而成矿期方解石具相对较低的δ13CPDB(-3.9‰～-2.1‰)、δ18OSMOW( 11.5‰～ 15.3‰)、Sr含量(785～2563μg/g,平均1571μg/g),和较高的87Sr/86Sr比值(O.7109～0.7154,平均0.7141).分析认为,成矿前方解石的C、O和绝大部分Sr来源于赋矿围岩--震旦系海相碳酸盐岩;而成矿流体为富H2CO3的溶液,它来自或流经富放射成因87Sr的下伏基底碎屑岩--中元古界冷家溪群浅变质岩;该流体与围岩发生水.岩反应导致成矿期方解石和辉锑矿的沉淀. 相似文献
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甘肃大水金矿是我国近年新发现的一类金矿,矿物成分简单,矿石品位高,易采、易选,经济效益极好。矿区主要出露中三叠统灰岩、白云质灰岩和印支期闪长玢岩株、闪长玢岩脉。金矿石可分似碧玉岩型、灰岩型、脉岩型和岩溶型四类;主要矿石为似碧玉岩,即赤铁矿化隐晶质硅质岩,似碧玉岩又可分纹层状、块状和角砾状等亚型。区内围岩蚀变主要是硅化、赤铁矿化和碳酸盐化。成矿期、尤其是成矿后方解石脉十分发育。岩矿石地球化学特征表明,硅化灰岩矿石、似碧玉岩主要为含金富硅盆地流体充填、交代作用的产物,形成于近地表、开放的氧化环境。 相似文献
9.
湘中锡矿山式锑矿稀土元素地球化学研究 总被引：1，自引：0，他引：1
湘中锡矿山式锑矿与硅化关系密切。稀土元素地球化学研究表明,存在着灰岩硅化和砂泥质岩硅化不同原岩型的成矿围岩蚀变。硅化岩的稀土元素含量要林未蚀变原岩稍低,但是仍具有与原岩一致的相对关系,据此,可以恢复硅化岩原岩。硅化灰岩的稀土元素含量低,硅化砂岩（包括硅化泥质粉砂岩）相对较高。硅化灰岩的稀土元素配分型式有负Ｅｕ异常和Ｃｅ异常;而硅化砂岩稀土元素配分型式类似原则岩,只有负Ｅｕ异常,无Ｃｅ异常。辉锑矿稀 相似文献
10.
老挝帕奔金矿床成矿流体来源与矿床成因:稀土元素和C、O、S同位素证据 总被引：3，自引：0，他引：3
帕奔金矿床位于老挝西北部,为韧-脆性剪切带控制的方解石脉型金矿床。文章在系统的野外和镜下工作基础上,对比了方解石脉、红化蚀变岩、弱碳酸盐化蚀变灰岩、未蚀变灰岩以及方解石脉内雄黄和雌黄的稀土元素特征,结合灰岩和方解石的C、O同位素组成以及雄黄/雌黄的S同位素组成,探讨了成矿流体的性质、来源及矿床成因。载金方解石、蚀变岩和灰岩的稀土元素配分曲线总体相近,均表现出重稀土元素平坦以及Eu、Ce负异常特征;但方解石轻微亏损轻稀土元素,且具有较高的Tb/La和Sm/Nd比值。在Y/Ho-La/Ho和Tb/Ca-Tb/La图解中,灰岩→蚀变岩→方解石投点分别与重结晶趋势线和重新活化趋势线基本吻合,灰岩和方解石C、O同位素组成也表现出了基本一致的海相碳酸盐岩成因。因此,推断帕奔金矿的含金方解石脉及相关的热液蚀变是同一成矿期内同源流体体系的产物,相对形成顺序由早到晚为弱蚀变灰岩、红化蚀变岩、方解石大脉,且与赋矿灰岩存在继承性。结合矿床地质特征,认为帕奔金矿床成矿流体可能主要来源于区域动力变质作用过程中,下二叠统灰岩的脱水和脱碳酸盐化作用。雄黄和雌黄δ34S值接近0‰,且方解石脉稀土元素总量较低,表明可能混入了深部岩浆流体和大气降水。综合区域地质背景,认为帕奔金矿床成矿作用很可能发生于晚三叠世—侏罗纪的滇缅马泰地体与印支陆块碰撞导致的区域韧-脆性构造活动,并受到岩浆活动驱动。 相似文献
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Neng‐Ping Shen Jian‐Tang Peng Rui‐Zhong Hu Shen Liu Ian M. Coulson 《Resource Geology》2011,61(1):52-62
The Xujiashan antimony deposit is hosted by marine carbonates of the Upper Sinian Doushantuo and Dengying Formations in Hubei Province, South China. Our Sr isotopic data from pre‐ and syn‐mineralization calcites that host the mineralization show that the pre‐mineralization calcite displays a narrow range of 87Sr/86Sr ratios (0.7096 to 0.7097), similar to the ratios of the Sinian seawater, and high Sr concentrations (2645 to 8174 ppm). In contrast, the syn‐mineralization calcite exhibits low Sr concentrations (785 to 2563 ppm) and high 87Sr/86Sr ratios (0.7109 to 0.7154), which is interpreted as the result of addition of radiogenic strontium during the antimony mineralization. The study of Sr isotopes suggests that their Sr component to the pre‐mineralization calcite derived directly from the host rocks (i.e. the Sinian marine carbonates), while radiogenic 87Sr for the syn‐mineralization calcite derived from the underlying Mesoproterozoic Lengjiaxi Group basement through hydrothermal fluid circulation along the major fault that hosts the mineralization. The Pb isotopic ratios of stibnite are subdivided into two groups (Group A and Group B), Group A is characterized by higher radiogenic lead, with 206Pb/204Pb = 18.874 to 19.288, 207Pb/204Pb = 15.708 to 15.805, and 208Pb/204Pb = 38.642 to 39.001. Group B shows lower lead isotope ratios (206Pb/204Pb = 17.882 to 18.171, 207Pb/204Pb = 15.555 to 15.686, and 208Pb/204Pb = 37.950 to 38.340). The single‐stage model ages of Group A are mainly negative or slightly positive values (‐258 to 3 Ma), while those of Group B range from 636 to 392 Ma, with an average of 495 ± 65 Ma. In addition, there are positive linear correlations among Pb isotopic ratios. These results suggest that the lead of Group A stibnite was mainly derived from the Sinian marine carbonates, and that of Group B stibnite from the underlying Lengjiaxi Group basement. This conclusion is consistent with the results of the Sr isotopes. These results indicate that the Xujiashan deposit is not syngenetic sedimentary and in situ reworked origin as previously considered. The metal (mainly Sb) of this deposit was not only derived from the Sinian host rocks, but also partly derived from the underlying Mesoproterozoic Lengjiaxi Group basement. 相似文献
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湖南锡矿山锑矿床中石英是与矿化作用密切相关的硅化作用的产物。通过野外地质调查和室内矿物学研究表明石英可分为 3个世代 :Ⅰ世代石英产于由交代作用形成的早期硅化岩中 ,Ⅱ、Ⅲ世代石英产于由充填作用形成的矿体中。石英的微量元素成分分析、红外吸收光谱、包裹体红外相对光密度、稀土元素含量比值揭示了成矿溶液的某些重要信息 ;石英的晶胞参数与其类质同象元素Al、Ti、Na的含量呈正相关关系 ;主矿化阶段形成的Ⅱ世代石英的发光强度随矿化强度呈现明显的变化规律 ,可以作为矿区石英的找矿标型特征。石英的稀土元素配分模式显示热液中的硅质很可能来源于壳源花岗岩浆。该研究成果对分析锑矿床的形成过程及机制和找矿具有十分重要的意义。 相似文献
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Numerous Fe-Cu deposits with mineralization styles similar to iron oxide-copper gold (IOCG) deposits form the Kangdian Fe-Cu metallogenic province, southwestern (SW) China. As one of the largest deposits in the region, the ~ 1.0 Ga Lala Fe-Cu deposit is hosted in a Paleoproterozoic volcanic-sedimentary succession named the Hekou Group which is alternately intruded by ~ 1.0 Ga doleritic plutons. This deposit has a paragenetic sequence evolving from Stage I of Na-alteration to Stage II of Fe mineralization, and finally to Stage III of Cu-(Mo, REE) mineralization, coeval with mafic-felsic intra-plate magmatism in the region. This study conducted in-situ Sr isotopic analyses on apatite and carbonate, aiming to resolve the long controversial issue regarding the origin of the Fe and Cu mineralizing fluids in the deposit. Apatite of Stage II has 87Sr/86Sr ratios varying from 0.71380 to 0.72733, much higher than those of synchronous igneous rocks in the region (0.7074 to 0.7091), but similar to the Paleoproterozoic host rocks (0.71368 to 0.71837 at ~ 1.0 Ga). This similarity indicates that radiogenic Sr of the Fe mineralizing fluid was dominantly sourced from the host rocks. Apatite and calcites of Stage III have 87Sr/86Sr ratios (0.75758–0.79293) much higher than apatite of Stage II and the host rocks but similar to the Archean basement rocks (as high as 0.80 at ~ 1.0 Ga) beneath the cover of the Yangtze Block, suggesting that the highly radiogenic Sr isotopic composition of the Cu mineralizing fluid was mainly inherited from the old basement rocks. In combination with previous C-O-S isotopic data indicating a magma-hydrothermal origin, it was suggested that the Fe mineralizing fluid was exsolved from a mafic magma that generated the ~ 1.0 Ga doleritic plutons, and inherited radiogenic Sr from the host rocks during fluid-rock interaction. By contrast, the Cu mineralizing fluid might have been sourced from another pulse of magmatic, Cu-Mo-REE- and CO2-rich fluid which have once interacted with Archean basement rocks prior to mineralization. The source of such a Cu-Mo-REE-rich fluid was not well constrained in current study but was inferred to be exsolved from a hidden felsic magma. We propose that intrusions of the bimodal magmas in Kangdian are responsible for regional hydrothermal circulation which led to Fe-Cu-(Mo, REE) mineralization in the Kangdian province. 相似文献
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江西广丰杨村超大型滑石矿床成因探讨 总被引：1，自引：0，他引：1
江西广丰杨村滑石矿储量达上亿吨,是世界上超大型滑石矿床之一。矿石主要由鲕粒状滑石组成,含少量石英和碳酸盐矿物及浸染状有机质,具有典型的沉积鲕粒状结构;赋矿围岩白云岩硅化较强烈。研究结果表明,白云岩与滑石矿页岩标准化稀土元素分配模式基本一致,重稀土元素相对轻稀土元素弱富集,稀土元素总量低,弱负铈异常,并且它们具有相同的87Sr/86Sr比值(0.7092~0.7101),白云岩的δ13CV-PDB值变化范围在-4.9‰~+0.7‰之间,与同期海水大体一致。这些地球化学特征暗示了滑石矿和白云岩具有相同的物质来源,滑石成矿所需的镁可能来源于海水。部分样品显示正铕异常,且白云岩中δ18OV-SMOW值(+14.5‰~+19.7‰)较同期海水偏低,87Sr/86Sr比值比同期海水稍高,暗示成矿物质并非由海水单一提供,可能还有高87Sr/86Sr比值、富硅的热液提供了成矿所需的硅。综合滑石和白云岩岩相学和地球化学特征,认为江西广丰杨村滑石矿为同生热水沉积成因,滑石中镁来源于富镁海水,硅来源于海水下渗淋滤古老硅铝质地层形成的富硅、高87Sr/86Sr比值的热液,海水中镁与热液中硅结合形成滑石。滑石矿在经历了同生沉积-热液期之后,又受到了后期强烈的变质变形作用的叠加,形成了具片理构造的滑石片岩。 相似文献
16.
The Jinshan gold deposit is located in the Northeast Jiangxi province,South China,which related to the ductile shear zone.It contains two ore types,i.e.the alteration-type ore and the goldbearing quartz vein ore.Rb-Sr age dating is applied to both gold-bearing pyrite in the alteration-type ore and fluid inclusion in the gold-bearing quartz vein to make clear the time of the gold mineralization of the Jinshan deposit.Analytical results of this study yielded that the age of the alteration-type ore bodies is about 838±110Ma,with an initial 87Sr/86Sr value of 0.7045±0.0020.However,the age of the gold-bearing quartz vein-type ore is about 379±49Ma,and the initial 87Sr/86Sr is 0.7138±0.0011.Based on the age data from this work and many previous studies,the authors consider that the Jinshan gold deposit is a product of multi-staged mineralization,which may include the Jinninian,Caledonian,Hercynian,and Yanshanian Periods.Among them,the Jinninian Period and the Hercynian Period might be the two most important ore-forming periods for Jinshan deposit.The Jinninian Period is the main stage for the formation of alteration-type ore bodies,while the Hercynian Period is the major time for ore bodies of gold-bearing quartz vein type.The initial values of the 87Sr/86Sr from this study,as well as the previous isotope and trace element studies,indicate that the ore-forming materials mainly derived from the metamorphic wall rocks,and the ore-forming fluids mainly originated from the deep metamorphic water. 相似文献
17.
Jean M. Richardson John Blenkinsop Keith Bell 《Contributions to Mineralogy and Petrology》1990,104(5):516-529
Magmato-hydrothermal cassiterite-topaz ore at the Carboniferous East Kemptville (EK) greisenhosted tin deposit (Nova Scotia, Canada) is cross-cut by veins containing apatite, triplite, vivianite and fluorite. Initial 87Sr/86Sr ratios of these minerals have an extreme range (0.7135 to 0.8284). The initial ratios of the host rocks, EK quartz-topaz rock and Davis Lake biotite monzogranite (0.729±0.001, 0.727±0.004), are also high. The adjacent Meguma Group metasedimentary rocks are more typical of crustal material (0.712–0.719 at 330 Ma). Rb and Sr contents of EK fluorite (max.: 13.0, 1420 ppm) and apatite (max.: 88.1, 6660 ppm) are unusually high and variable. Unexpectedly, high Sr contents correlate positively with the high initial 87Sr/86Sr ratios. Fluorite and phosphate minerals from the first set of post-greisen veins at East Kemptville reflect the unusual chemistry of a high 87Sr/86Sr fluid present in the deposit after ore formation. The most extreme composition of this fluid was characterized by 87Sr/86Sr>0.8284, high Rb/Sr, high P, Rb, Cu, Zn and Fe contents, but low abundances of Ca, Pb and Sn with respect to the Davis Lake monzogranite. Such a fluid could have been derived from the greisen fluid and modified by reaction with the overlying Meguma metawacke. A second alternative, which cannot be well constrained at present, is that an extremely radiogenic fluid entered the deposit after ore formation and mixed with the postore fluid. In either case, the modified fluid subsequently mixed with meteoric water and precipitated the minerals with much lower 87Sr/86Sr ratios and Rb and Sr contents. 相似文献
18.
湘中是全球最大的锑金矿集区,近年来又陆续探明了一批钨矿床,但这些钨矿和锑金矿之间的关系目前尚不明确。曹家坝钨矿床是目前该矿集区内规模最大的钨矿床(19.03Mt@0.37%WO3),矿体与矽卡岩密切共生,成矿作用划分为矽卡岩阶段、退化蚀变阶段和石英-白钨矿-硫化物阶段。不同阶段白钨矿δ18OV-SMOW变化范围为6.0‰-7.9‰,δDV-SMOW变化范围为-79.1‰--68.9‰,对应的δ18OH2O变化范围为3.3‰-5.2‰。白钨矿(87Sr/86Sr)t变化范围为0.72215-0.73049,εNd(t)变化范围为-12.8--10.6。龙山锑金矿床是矿集区内发育的大型脉状锑金矿床(4.2Mt@3.4%Sb和3.7g/t Au),矿体赋存在震旦系江口组板岩中,发育两个世代的白钨矿与辉锑矿共生。白钨矿δ18OV-SMOW变化范围为5.4‰-9.0‰,δDV-SMOW变化范围为-72.9‰--60.2‰,对应的δ18OH2O变化范围为3.1‰-6.7‰。Sr-Nd-H-O多元同位素特征显示,曹家坝钨矿床的成矿物质和成矿流体以岩浆来源为主,龙山锑金矿床有岩浆流体参与成矿,两者均有少量板溪群基底地层和大气降水的加入。综合本次及前人研究成果,曹家坝钨矿床和龙山锑金矿床具有成因联系,二者均是湘中矿集区晚三叠世岩浆热液W-Sb-Au成矿系统的重要组成部分。 相似文献
19.
湘西渣滓溪钨锑矿床白钨矿的Sm-Nd和Sr同位素地球化学 总被引：4，自引：0，他引：4
渣滓溪钨锑矿床位于湘西雪峰山弧形构造带的中段,是我国典型的脉状充填型锑矿床。本文对渣滓溪矿区不同产状产出的白钨矿进行了Sm-Nd和Sr同位素研究。研究表明,渣滓溪矿区白钨矿Sm/Nd变化范围相对较宽（0.36~0.63）,143Nd/144Nd为0.51211~0.51288;在147Sm/144Nd-143Nd/144Nd图解中,该矿白钨矿样品没有明显的线性分布趋势,无法厘定出该矿的准确成矿时间。该矿白钨矿的Nd(t)明显可分为两组（-10.2~-14.7和-3.79~+0.01）,其成矿流体中的Nd主要有两个来源,一部分可能来自晚元古代地层或下伏陆壳基底的碎屑岩,另一部分很可能与冷家溪群的基性、超基性岩有关。与Nd同位素不同,渣滓溪成矿流体中Sr同位素组成均一化程度较高,该矿白钨矿87Sr/86Sr为0.7304~0.7329;该矿这种明显富放射成因87Sr的成矿热液,排除了成矿流体来自海水和赋矿围岩作为唯一矿源层的可能性,下伏陆壳的结晶基底很可能是这种高放射成因Sr的提供者。沃溪和渣滓溪矿区白钨矿Sr-Nd同位素组成的对比研究表明,两矿区的成矿物质来源有所不同,前者应来自一种更古老、更成熟、更富放射成因Sr的下伏陆壳基底。 相似文献
20.
江西银山多金属矿床伊利石的形成与流体成矿作用的初步研究 总被引：4，自引：0，他引：4
江西银山多金属矿床的热液蚀变粘土矿物主要由伊利石组成,伊利石主要由流体作用过程中长石的伊利石化形成,其结晶度与成矿流体作用密切相关.银山第1期铅锌银成矿作用,水/岩比相对较低,成矿流体以孔隙渗透为主,溶质迁移慢,形成含有少量膨胀层的伊利石;第2期铜金成矿作用,水/岩比相对较高,流体的运移方式以通道式或裂隙式为主,溶质迁移的速度快,形成不含膨胀层的伊利石.研究表明成矿作用过程中的伊利石化主要与铅锌银矿化有关,而绿泥石化与铜金矿化有关. 相似文献