辽宁青城子矿集区铅锌-银-金矿床硫化物化学成分及找矿意义

对辽宁青城子铅锌-银-金矿床的主要矿石矿物方铅矿、闪锌矿和黄铁矿进行了显微鉴定、电子探针和ICP-MS分析,获得它们的固结顺序为：黄铁矿早于闪锌矿,二者早于方铅矿（闪锌矿交代黄铁矿,方铅矿交代前两者）。从硫化物成分空间分布可以判断成矿流体以甸南-榛子沟为中心分别向二道-喜鹊沟和大地-白云迁移。根据方铅矿固结温度（327℃）参考石英流体包裹体均一温度（322℃）,限定以方铅矿为主的矿床其硫化物形成温度约为322～327℃;利用Cd在方铅矿-闪锌矿分配系数温度计获得铅锌矿成矿温度在344～464℃之间,结合闪锌矿出溶黄铜矿温度（高于350℃）,参考石英流体包裹体均一温度（300～360℃）,并参考黄铁矿发生脆性变形温度（400℃）,获得以闪锌矿为主的矿床硫化物形成温度约为360～400℃,银铅锌矿床的成矿温度被限定在390～400℃;由于自然金主要赋存在黄铁矿微裂隙中,利用黄铁矿发生脆性变形温度并结合石英流体包裹体温度（230～370℃）约束金成矿温度约为370～400℃。成矿温度较高可能归因于样品采集位置较深所致;最后利用矿石矿物、侵入岩、围岩微量元素对比分析判断成矿流体与中生代（特别是印支期）侵入岩具有亲缘性,根据印支期岩浆混合特征认为岩浆混合作用可能对本地区成矿作用具有重要贡献。     

辽宁青城子矿集区金银矿成矿流体特征和成矿物质来源示踪

青城子矿集区地处辽东-吉南裂谷带西端,是金银多金属的重要矿集区,其成矿作用复杂,为了深入揭示其成矿流体特征和成矿物质来源,近期作者对矿集区内典型的金银矿床(高家堡子银矿、小佟家堡子金矿、杨树金矿和林家三道沟金矿)的地质特征研究的基础上,开展了流体包裹体测温和激光拉曼成分分析,H、O、C、S、Pb同位素的分析,进行了多元同位素体系的综合示踪。青城子矿集区金银矿床最为发育富液相包裹体,局部发育气相包裹体,个别石英脉中少量发育H_2O-CO_2三相包裹体和CO_2两相包裹体,成矿温度范围大,是多阶段成矿作用发展演化的反映,主成矿温度在120~210℃之间。成矿流体为中温低盐度低密度的水盐流体。激光拉曼成分特征,成矿流体总体属于含H_2的H_2O-NaCl-CH_4-CO_2体系,属于还原性流体,具有深源的特征。氢氧同位素结果显示,成矿热液主要来源于岩浆水和大气降水。碳氧同位素结果显示,成矿流体起源或流经含有大量有机质的地层,地层中的有机质可能参与了金的富集成矿。硫同位素特征表明,矿体中的硫来自海水硫酸盐还原硫与深部岩浆热液来源的混合,可能主要来自海水硫酸盐的还原。铅同位素结果表明,金银矿石中铅是地层与岩浆岩的混合铅。     

青城子铅锌矿床成因分析

青城子铅锌矿床是我国北方的大型铅锌矿床,矿区赋矿层位下部产出层状矿体,上部产出脉状及不规则状矿体。经过对矿区矿石及岩石的铅、硫同位素研究表明,层状及脉状矿体成矿物质来源相同,主要来自地层。根据矿区内含硫矿物的组合特征、成矿流体的pH值及含硫矿物δ34S分布特征可以推断矿床成因不属于海相沉积成因。矿石中石英流体包裹体特征表明矿床形成后未遭受区域变质作用,成矿流体的温度180～280℃,流体成分Na+K+,Ca2+Mg2+,K+/Na+为0.66,Ca2+/Mg2+为6.67,(CH4+H2+N2)/CO2值为0.012～0.048,为Na+?Ca2+?Cl-弱还原型溶液,pH值为6.31。流体特征与矿区内的花岗岩相差较大,与变质热液有所差异,经流体的氢氧同位素测定,成矿热液具地热水氢氧同位素特征相似。综合研究表明,矿床的成因与区域变质期后局部地区的的混合岩化作用关系密切,由混合岩化作用分异的气水热液与地下水、层间水等混合后沿早期形成的层间滑脱部位和断裂充填成矿,形成了青城子矿田‘下层上脉’的空间组合。     

铜山口斑岩-矽卡岩型铜钼矿床流体包裹体特征研究

<正>斑岩铜矿床的形成与岩浆期后流体活动关系密切,是成矿的必要条件。深入研究成矿流体演化和矿质沉淀的机制是进一步探讨矿化富集规律及指导找矿的重要依据(Wang et al.,2004,2006;Hou et al.,2011)。流体包裹体是保存在矿物中成矿流体的直接样本,矿床不同蚀变带内矿石矿物和脉石矿物中所含流体包裹体代表了成矿流体演化的不同阶段,对不同蚀变带内流体包     

桂东南金银矿床成矿规律与成矿模式

根据桂东南金银矿床成矿地质条件，典型金银矿床的硫、氢、氧、铅同位素、稀土元素、矿物包裹体流体组份和成矿物理化学条件，提出了桂东南金银矿床的混合岩化－岩浆热液型和变质－岩浆热液型的成因类型，并建立了桂东南金银矿床的成矿模式。即地槽发展时期形成矿源层；变质－混合岩化作用促进金银组份活化迁移与初始富集；剥离作用使金银组份再次迁移富集；燕山期构造－岩浆作用成矿。     

岩石钾质变化及钾交代与成矿关系

钾质高低及变化可反映岩石演化程度和钾交代作用。发生钾交代的岩石为成矿有利岩石和找矿标志。岩石钾交代与钾质升高归根于富碱的地幔流体活动。上升的地幔流体交代上地幔和地壳岩石形成富碱岩石和碱交代岩,并活化迁移不同围岩中成矿元素形成各种矿床。大地构造单元边缘与陆内张裂活动带是地幔流体交代活动场所和大型矿床形成地。许多矿床包括金矿床和钾交代关系密切。     

西天山达巴特斑岩型铜矿床流体地球化学特征和成矿作用

本文对西天山地区达巴特斑岩铜钼矿床矿石中石英的流体包裹体进行了均一法和冷冻法测温,对相应的石英单矿物进行了氢氧同位素测定,据此判断了成矿流体的来源和成矿物理化学条件。结果表明含铜钼矿石中的流体包裹体主要为气液两相包裹体和含子矿物三相包裹体,不同样品中同类包裹体具有基本一致的均一温度、子矿物溶化温度、冰点、盐度和密度值, 数据显示成矿流体均呈中温低盐度的特点。矿石氢氧同位素组成表明矿床的成矿流体属于岩浆水范畴,而且具有深部来源甚至幔源的可能性。根据矿体主要分布在火山机构南北两侧与地层的接触带及其内发育的断裂构造中这一空间关系,结合流体包裹体测温结果,推测尽管该矿床成矿流体具有深源特征,但成矿作用发生在中浅部环境,成矿与火山机构最晚期的花岗斑岩具有密切的成因关系。     

柴北缘阿日特克山斑岩型铜钼矿床流体包裹体、稳定同位素特征及其地质意义

阿日特克山铜钼矿床位于柴北缘中北段,为近年来新发现的隐伏斑岩型矿床,矿体产出于海西晚期—印支期花岗闪长（斑）岩和古元古代达肯大坂岩群接触部位。为探讨该矿床成矿流体特征和成矿机制,本文对矿床野外地质特征、流体包裹体及稳定同位素组成进行了系统的研究。根据不同类型矿脉之间的相互关系,可将热液成矿期次划分为成矿早期石英阶段、成矿期辉钼矿-多金属硫化物-石英阶段和成矿晚期石英-方解石阶段。流体包裹体岩相学研究表明,阿日特克山铜钼矿床流体包裹体以Ⅰ型（富液相L+V两相水溶液包裹体）、Ⅱ型（富气相L+V两相水溶液包裹体）和Ⅲ型（含子矿物三相水溶液包裹体）为主。显微测温及包裹体拉曼光谱分析结果显示,成矿流体体系为中高温、中低盐度、中高密度的NaCl-H₂O体系,至成矿晚期,流体性质变化为低温、低盐度、高密度流体,矿床形成深度为0.40~4.00 km。氢氧同位素分析测试结果显示,δD_V-SMOW值为-92.9‰~-78.4‰,δ¹⁸O_H2O值为-7.4‰~2.0‰,表明成矿流体以混合流体为主,随着成矿流体的演化,有更多的大气降水不断混入。矿石中金属硫化物δ³⁴S值处于9.4‰~11.7‰之间,平均值为10.2‰,表现出明显的地层硫特征,为岩浆热液与围岩地层相互作用所致。综上认为,阿日特克山铜钼矿床为矽卡岩型-斑岩型矿床,形成于海西晚期—印支期俯冲碰撞构造环境,混合成矿流体强烈的不混溶作用为斑岩型铜钼矿床形成的主要机制。     

辽宁青城子矿田高家堡子银矿成矿流体特征及地质意义

高家堡子银矿是产于辽宁青城子矿田内的大型银矿床。利用从该矿床所采集的含银石英脉及脉状铅锌银矿石样品,对矿床成矿流体进行了详细显微测温、激光拉曼光谱、群体包裹体成分及氢氧同位素测试研究。结果表明高家堡子银矿存在纯液相及水盐气液两相流体包裹体;流体包裹体显微测温揭示水-盐气液两相流体包裹体均一温度为122℃~202℃,主要集中在122℃至185℃之间;成矿流体盐度为1.05%~9.34%Na Cleq;激光拉曼测试显示包裹体主要由H2O、CO2、CH4等组成,与流体包裹体气相成分测试结果基本一致;成矿流体液相分析显示Na+、Mg2+、Ca2+、K+、Cl-、SO2-4为主要成矿流体的阴阳离子。结合矿田内已有H-O同位素测试分析结果,认为青城子矿田内金银矿成矿流体来自岩浆活动驱动的热液系统。高家堡子银矿为岩浆热液叠加早期沉积变质大理岩的浅成低温银矿床,岩浆活动在成矿中起了重要作用。     

江西德兴铜厂斑岩铜矿成矿物质来源的再认识——来自流体包裹体的证据

本文从江西德兴斑岩铜矿铜厂矿床的流体包裹体研究出发,讨论了矿床成矿物质来源与矿床成因。矿床中流体包裹体分为6类,即富液包裹体、富气包裹体、含石盐多相包裹体、含CO2多相包裹体以及熔体包裹体和熔体-流体包裹体。富气包裹体、含石盐多相包裹体和熔体与熔体-流体包裹体代表了成矿早期岩浆热液的特征。在这些包裹体中发现黄铜矿等金属矿物,表明成矿金属主要源自岩浆。含石盐多相包裹体和富气包裹体与矿体关系不甚密切,但其中所含有的金属矿物特别是黄铜矿,暗示早期来自岩浆的热液流体金属含量较高,形成于大气降水与岩浆热液混合之前。成矿中晚期大气降水流体在冷却和稀释岩浆流体方面对于矿床的形成作出了一定贡献,但是来自围岩的大气降水可能并没有向成矿体系提供大量金属。     

Geology and mineralogy of ore at the hidden Engteri Au-Ag deposit,the Magadan Region

The Engteri is a new hidden Au-Ag deposit in the Russian segment of the Pacific ore belt. The discovery of this deposit merits special attention, because it involves repeated attempts to reappraise a lowprospective ore occurrence, which were crowned with success as a result of fulfillment of large-scale drilling project. The average Au grade is 18.6 gpt. The deposit is classified as the gold geochemical type of Au-Ag deposits. The major ore mineral is pyrite, which amounts to no less than 95% of the total ore minerals. The native phases comprise electrum and to a lesser extent native gold of low fineness (730). The homogenization temperature of fluid inclusions is 125–255°C with a distinct maximum at 145–150°C. Despite blind localization of some orebodies, the Engteri deposits bears evidence for a deep erosion level: (1) small vertical range of economic mineralization (50–100 m); (2) predominant occurrence of massive sugarlike quartz with a low sulfide content; (3) prevalence of massive and brecciated textures above rhythmically banded textures; and (4) lack of low-temperature propylites. The southern part of the ore field distinguished by occurrence of rhythmically banded, framework-tabular, and brecciated texture has the best prospect for revealing new orebodies. The Engteri deposit allowed us to outline the following prospecting guides and methods of prospecting for hidden Au-Ag deposits: (1) these deposits are regularly arranged in ore clusters between heavy concentrate anomalies of cinnabar and gold-silver or silver-base-metal occurrences (method of missed link); (2) findings of fragments of ore mineral assemblages with sporadically high Au and Ag contents in barren calcite-quartz veins (method of indicators); (3) linear zones of ankeritization in the fields of low- and mediumtemperature propylites (mapping of metasomatic rocks); and (4) pyrite-quartz veinlets with rhythmically banded pockets (mineralogical mapping of halos of stringer-disseminated mineralization).     

黑龙江乌拉嘎金矿的次火山岩浆-热液成矿:熔体-流体包裹体证据

黑龙江乌拉嘎金矿是我国陆相火山岩区的重要金矿之一。构造位置处于古亚洲构造域与滨太平洋构造域交接复合部位的东北缘,矿体主要分布于团结沟斜长花岗斑岩接触带部位的隐爆角砾岩带和黑龙江群变质岩的层间裂隙中。斜长花岗斑岩的石英斑晶中发育3类包裹体:熔体包裹体、原生的L-V包裹体(及少量的L-V-S包裹体)和次生的L-V包裹体。玻璃质熔体包裹体相当于酸性殘浆的成分(SiO2达69.5%～73.8%),其捕获温度大于800℃。石英斑晶中次生L-V包裹体均一温度集中在210～350℃、盐度5%～7%NaCleqv,代表了次火山岩浆热液的特征,与黄铁矿-早期白色玉髓状石英阶段中Q1的包裹体均一温度范围很接近,而盐度略高于白色玉髓状石英Q1的。乌拉嘎金矿的金成矿可划分3个成矿阶段,发育盐水溶液包裹体:(1)黄铁矿-早期白色玉髓状石英阶段,包裹体均一温度为154～355℃,集中在190～330℃,盐度为1.3%～8.2%NaCleqv,密度为0.53～0.88g/cm3。(2)烟灰色玉髓状石英-多金属硫化物阶段,石英中包裹体均一温度为159～196℃,集中在170～190℃,盐度为2.2%～3.2%NaCleqv,密度0.79～0.92g/cm3。(3)碳酸盐-石英阶段,方解石中包裹体均一温度集中在170～270℃;盐度0.5%～2.9%NaCleqv。成矿流体以中低温、低盐度、贫CO2的盐水体系为特征,与国内外陆相火山-次火山热液矿床十分相似。石英斑晶中熔体、流体包裹体及其共存反映了次火山岩浆活动晚期,由硅酸盐熔体通过不混溶产生含矿的盐水溶液的可能,说明了金成矿与斑岩的成因联系,乌拉嘎金矿应该属于陆相火山-次火山活动有关的中低温浅成热液金矿床。     

辽南丹东地区中生代金成矿的FIP的证据

辽南丹东地区产出有五龙、四道沟两个大型金矿床,两矿床与中生代燕山期三股流花岗岩体存在密切的空间华生关系。长期以来,对这一地区金的成矿作用时代存在有不同的认识,一种观点认为金的成矿作用只有一期,即中徨代（燕山期）;另一种观战认为金的成矿作用有两期,即元古代和中生代（燕山期）分别以四道沟金矿和五龙金矿为代表,作者利用流体包裹体面（ＦＩＰ）研究的新方法对金矿床及伴生花岗岩进行了研究。结果表明,三股流花岗     

Ore-bearing hydrothermal metasomatic processes in the Elbrus volcanic center, the northern Caucasus, Russia

Precaldera, caldera, and postcaldera cycles are recognized in the geological evolution of the Pleistocene-Holocene Elbrus volcanic center (EVC). During the caldera cycle, the magmatic activity was not intense, whereas hydrothermal metasomatic alteration of rocks was vigorous and extensive. The Kyukyurtli and Irik ore-magmatic systems have been revealed in the EVC, with the former being regarded as the more promising one. The ore mineralization in rocks of the caldera cycle comprises occurrences of magnetite, ilmenite, pyrite and pyrrhotite (including Ni-Co varieties), arsenopyrite, chalcopyrite, millerite, galena, and finely dispersed particles of native copper. Pyrite and pyrrhotite from volcanics of the caldera cycle and dacite of the Kyukyurtli extrusion are similar in composition and differ from these minerals of the postcaldera cycle, where pyrite and pyrrhotite are often enriched in Cu, Co, and Ni and millerite is noted as well. The composition of ore minerals indicates that the hydrothermal metasomatic alteration related to the evolution of the Kyukyurtli hydrothermal system was superimposed on rocks of the caldera cycle, whereas the late mineralization in rocks of the postcaldera cycle developed autonomously. The homogenization temperature of fluid inclusions in quartz and carbonate from crosscutting veinlets in the apical portion of the Kyukyurtli extrusion is 140–170°C and in quartz from geyserite, 120–150°C. The temperature of formation of the chalcopyrite-pyrite-pyrrhotite assemblage calculated using mineral geothermometers is 156 and 275°C in dacite from the middle and lower portions of the Malka lava flow and 190°C in dacite of the Kyukyurtli extrusion. The hydrothermal solutions that participated in metasomatic alteration of rocks pertaining to the Kyukyurtli ore-magmatic system (KOMS) and formed both secondary quartzite and geyserite were enriched in fluorine, as evidenced from the occurrence of F-bearing minerals-zharchikhite, ralstonite, α-ralstonite, and fluorite-identified in these metasomatic rocks for the first time. By analogy with porphyry Cu-Mo deposits in Chile and the United States, the ore mineralization of the KOMS may be classified by composition and textural and structural attributes as a supraore level of porphyry copper genetic type. The volcanic rocks of the KOMS and the EVC as a whole are enriched in Ag, Mo, Zn, As, Sb, Se, and Ba. Judging from the scale of argillic alteration and taking into account the data on porphyry Cu-Mo ore-magmatic systems of the Greater Caucasus, veined Pb-Zn ore mineralization may be expected in the propylitic zone at a depth down to 1000 m from the present-day erosion level of the KOMS. Stringer-disseminated Au-Ag, Cu, and Cu-Mo ore mineralization of the upper part of the porphyry ore-magmatic system related to subvolcanic dacitic intrusions may be localized somewhat deeper.     

Characteristic Features of Tin–iron–copper Mineralization in the Anle-Huanggangliang Mining Area, Inner Mongolia, China

Abstract: The Anle Sn‐Cu and Huanggangliang Fe‐Sn deposits have been exploited in the Linxi district, which is located 165 km northwest of Chifeng City in northern China. In this study the formation mechanisms of the tin deposits in the Anle and Huanggangliang mining area were investigated to understand the mechanisms of tin mineralization in northern China. The veins of the Anle deposit are divided into cassiterite–quartz–chlorite veins, chalcopyrite‐bearing quartz veins, cassi–terite–chalcopyrite–bearing quartz veins and sphalerite‐quartz veins. The sequence of mineralization is tin mineralization (stage I), copper mineralization (stage II), and lead‐zinc mineralization (stage III). The Huanggangliang tin deposit consists of magnetite skarn orebodies and many cassiterite‐bearing feldspar–fluorite veins and veinlets cutting the magnetite orebodies. The fluid inclusions in quartz and fluorite in ores from the Anle and Huanggangliang tin deposits are divided into two‐phase fluid inclusions, vapor‐rich fluid inclusions and poly‐phase fluid inclusions. The final homogenization temperatures of fluid inclusions of quartz in the ores of the Anle deposit and fluorite of tin‐bearing feldspar veins in the Huanggangliang tin deposit range from 195 to 425C and from 215 to 450C, respectively. The fluids responsible for the Anle and Huanggangliang tin deposits were of very high temperature and NaCl‐rich ones containing K, Ca, Al, Si, Ti, Fe and Cl in addition to ore metals such as Sn and Cu. The temperature and chemical composition of fluid in fluid inclusions of igneous rocks in the mining area are very similar to those of fluid in fluid inclusions in the ores of these deposits. The fluid for these ore deposits had a close relation with the fluid coexisting with melt of Late Jurassic granitic rocks in this mining area. Salinities of fluid inclusions from these ore deposits and granitic rocks in the mining area were estimated to range from 35 to 50 wt % NaCl equivalent. Based on arsenopy‐rite geothermometry and fluid inclusion studies, a fluid containing 40 wt% NaCl (eq.) could be formed by phase separation of fluid having 6 wt% NaCl (eq.) at a temperature of 420 to 500C and a pressure of 0.3 to 0.4 kb. The temperatures and pressures presented above indicate an NaCl‐rich magmatic fluid derived from granitic melt that had intruded into a shallow level of crust caused the Sn–Fe–Cu mineralization of the mining area. The geological relationship between these ore deposits and granitic bodies around the ore deposits, and the similarity of fluids forming these ore deposits and coexisting with granitic melt, suggest that these ore deposits were formed by the activity of fluid derived from granitic melt in Late Jurassic age.     

朱拉扎嘎金矿地质特征及成因研究

朱拉扎嘎金矿是一个大型矿床,赋矿围岩为中元古界变质钙质砂岩、粉砂岩、板岩、大理岩、流纹岩.主矿体和围岩产状基本一致.划分出两个矿带,总体走向35°.矿体受层间裂隙控制,共发现56个矿体,规模为长10余米到300 m,厚度几十厘米到4.5 m,延伸可达200 m.主要蚀变有透辉石化、阳起石化、绿帘石化、冰长石化,还有碳酸盐化、绿泥石化、硅化.矿石类型有蚀变变质砂岩型、蚀变火山岩型、交代岩型、喷流沉积岩型和石英脉型.自然金和银金矿是矿石中金的最主要赋存形式.含金较高的原始沉积岩层,比较发育的层间裂隙或破碎带,与多次构造活动相伴的多次热液活动和多次矿化作用,便形成本区的岩浆热液蚀变型金矿床.     

广西富贺钟钨锡多金属矿集区稀有气体同位素特征及其地质意义

桂东北富贺钟地区是广西重要的有色金属基地之一, 在姑婆山复式岩体的西南缘产出有新路、水岩坝和珊瑚3个主要钨锡多金属矿田。本文对不同矿田典型矿床分别开展了稀有气体同位素研究, 根据黄铁矿流体包裹体He、Ar、Ne同位素组成, 进一步讨论了区内钨锡成矿流体来源和壳-幔成矿作用过程。结果表明, 黄铁矿流体包裹体3He/4He=0.53~4.53 Ra、40Ar/36Ar=315.58~600.55、38Ar/36Ar=0.18688~0.19102、20Ne/22Ne=9.737~9.848、21Ne/22Ne=0.0291~0.0304, 显示成矿流体为地壳流体、幔源流体和饱和大气水的混合物, 成矿过程中有地幔物质的加入, 地幔He约占8.7%~75.7%。结合区内成岩、成矿的测年资料及岩石成因等综合分析认为, 区内中生代发生了多期次壳-幔相互作用, 且作用强度经历了强→弱→强的演化过程, 分别导致了姑婆山岩体主体岩性(165~160 Ma)和晚期细粒花岗岩(154~151 Ma)的侵位, 以及钨锡多金属成矿作用(136~100 Ma), 成矿与晚期的细粒花岗岩同位但不同时。     

Composition of Fluids Responsible for Gold Mineralization in the Pechenga Structure of the Pechenga–Imandra–Varzuga Greenstone Belt,Kola Peninsula,Russia

This study presents the first fluid inclusion data from quartz of albite–carbonate–quartz altered rocks and metasomatic quartzite hosting gold mineralization in the Pechenga structure of the Pechenga–Imandra–Varzuga greenstone belt. A temperature of 275–370°C, pressure of 1.2–4.5 kbar, and the fluid composition of gold-bearing fluid are estimated by microthermometry, Raman spectroscopy, and LA-ICP-MS of individual fluid inclusions, as well as by bulk chemical analyses of fluid inclusions. In particular, the Au and Ag concentrations have been determined in fluid inclusions. It is shown that albite–carbonate–quartz altered rocks and metasomatic quartzite interacted with fluids of similar chemical composition but under different physicochemical conditions. It is concluded that the gold-bearing fluid in the Pechenga structure is similar to that of orogenic gold deposits.     

吉林小西南岔金-铜矿床成矿流体地球化学特征及矿床成因研究

小西南岔金-铜矿床产于海西期花岗闪长岩-石英闪长岩体之中,其矿化类型以石英大脉及石英细脉带型金-铜矿化为主,局部地段叠加发育有石英脉型辉钼矿化。流体包裹体研究结果表明,矿区金-铜矿脉及辉钼矿脉石英中均主要发育含NaCl子矿物三相、气相-富气相及气液两相三种类型的原生流体包裹体,同类包裹体均一温度、盐度等参数相近,显示两类矿化成矿流体具有相似的地球化学性质,氢-氧同位素研究结果反映它们均主要来源于岩浆热液。辉钼矿Re-Os同位素定年研究表明区内辉钼矿化主要发生于109Ma±,而金-铜矿脉石英的40Ar-39Ar同位素定年结果表明金-铜矿化则主要发生于123.35±0.8Ma。结合矿区已有的岩浆岩年代学研究成果,提出小西南岔矿区金-铜矿化主要与燕山晚期细粒(花岗)闪长岩活动有关,而辉钼矿化则与其后侵位的隐伏花岗斑岩活动有关的认识。     

内蒙古中部大青山新地沟绿岩带型金矿的成矿时代

内蒙古新地沟金矿床产于大青山太古宙花岗岩-绿岩带中,受色尔腾山群柳树沟组中基性火山岩系和韧性剪切带控制.容矿岩石主要是变安山质-英安质火山岩类.为解决主矿体的形成时代,采用石英40Ar/39Ar法,直接测定了含金石英细脉浸染状矿石中石英的形成时代,结果表明新地沟金矿的形成时代为1991.43～1988.93Ma.由此提出新地沟金矿的成因主要与吕梁期韧性剪切带中的变质变形作用有关.