华南火成黄英岩的特征和成因机理

新近在华南发现的黄英岩与富氟花岗岩存在密切的时空联系。黄英岩具典型火成斑状结构。斑晶为黄玉和石英，基质由柱状－针状黄玉微晶和他形石英组成。     

Fluid Inclusions and Stable Isotopic Characteristics of the Yaoling Tungsten Deposit in South China: Metallogenetic Constraints

The Yaoling tungsten deposit is a typical wolframite quartz vein‐type tungsten deposit in the South China metallogenic province. The wolframite‐bearing quartz veins mainly occur in Cambrian to Ordovician host rocks or in Mesozoic granitic rocks and are controlled by the west‐north‐west trending extensional faults. The ore mineralization mainly comprises wolframite and variable amounts of molybdenite, chalcopyrite, pyrite, fluorite, and tourmaline. Hydrothermal alteration is well developed at the Yaoling tungsten deposit, including greisenization, silicification, fluoritization, and tourmalinization. Three types of primary/pseudosecondary fluid inclusions have been identified in vein quartz, which is intimately intergrown with wolframite. These include two‐phase liquid‐rich aqueous inclusions (type I), two‐ or three‐phase CO₂‐rich inclusions (type II), and type III daughter mineral‐bearing multiphase high‐salinity aqueous inclusions. Microthermometric measurements reveal consistent moderate homogenization temperatures (peak values from 200 to 280°C), and low to high salinities (1.3–39 wt % NaCl equiv.) for the type I, type II, and type III inclusions, where the CO₂‐rich type II inclusions display trace amounts of CH₄ and N₂. The ore‐forming fluids are far more saline than those of other tungsten deposits reported in South China. The estimated maximum trapping pressure of the ore‐forming fluids is about 1230–1760 bar, corresponding to a lithostatic depth of 4.0–5.8 km. The δD_H2O isotopic compositions of the inclusion fluid ranges from ?66.7 to ?47.8‰, with δ¹⁸O_H2O values between 1.63 and 4.17‰, δ¹³C values of ?6.5–0.8‰, and δ³⁴S values between ?1.98 and 1.92‰, with an average of ?0.07‰. The stable isotope data imply that the ore‐forming fluids of the Yaoling tungsten deposit were mainly derived from crustal magmatic fluids with some involvement of meteoric water. Fluid immiscibility and fluid–rock interaction are thought to have been the main mechanisms for tungsten precipitation at Yaoling.     

延边杨金沟大型白钨矿矿床流体包裹体特征及成因探讨

延边杨金沟大型白钨矿矿床的成矿过程可划分为黄铁矿-毒砂阶段、石英-粗粒白钨矿阶段、石英-多金属硫化物-细粒白钨矿阶段以及碳酸盐阶段,其中,石英-粗粒白钨矿阶段为主成矿阶段。与粗粒白钨矿共生的石英中主要发育4种类型流体包裹体。Ⅰ型包裹体的气相组分主要由CO₂、CH₄和N₂组成,均一温度为278.5～336.4℃,盐度（w(NaCl)）为3.53%～7.72%;Ⅱ型气液两相包裹体均一温度为144.7~345.9℃,多数为190～220℃,w(NaCl)为3.05%～9.34%;Ⅲ型CO₂包裹体中的气相组分均为CO₂,液相中尚含少量CH₄等组分;Ⅳ型含CO₂三相包裹体由液态CO₂、气态CO₂、盐水溶液三相组成,CO₂相占10%～15%,完全均一化温度为301.6～305.1℃。综合地质条件及矿床特征、包裹体显微测温和成分分析结果认为：杨金沟石英脉型白钨矿矿床的成矿流体为中高温、低盐度的NaCl-H₂O-CO₂（-N₂）体系,初始流体主要来自酸性岩浆热液,并有地层组分的加入。成矿过程中流体发生过不混溶,并对钨的富集起到了重要作用。     

黔西南紫木凼金矿床流体包裹体特征及对成矿的指示意义

紫木凼金矿床是黔西南微细浸染型（卡林型）金矿带上的一个代表性金矿床。本文对该矿床主成矿阶段（Ⅱ）石英和方解石以及晚成矿阶段（Ⅲ）方解石中的流体包裹体进行了岩相学和显微测温研究,结果表明,各成矿阶段包裹体类型有H2O包裹体、CO2包裹体、CO2-H2O包裹体、气相CH4包裹体和CH4-H2O包裹体5类,其中CO2包裹体和CO2-H2O包裹体只在主成矿阶段（Ⅱ）的石英中发育。主成矿阶段和晚阶段流体包裹体均一温度范围分别为180～220℃和100～180℃,盐度分别为0.35%～7.45% NaCl和0.18%～5.71% NaCl,密度分别变化于0.745～0.969 g/cm3和0.868～0.993 g/cm3,总体属于中低温、低盐度、中等密度的H2O-NaCl-CO2流体体系。矿床成矿过程是一个温度退缩、盐度降低、密度增大的过程。主成矿阶段H2O-NaCl-CO2流体发生不混溶作用,是导致矿质沉淀成矿的主要原因。CO2流体、CH4流体在金的成矿过程中起重要作用。     

湘南地区钨锡多金属矿床浆液过渡态熔体类型成因联系及其成矿意义

岩浆液态不混溶形成的浆液过渡态熔体是与高度分异花岗岩有关的钨锡多金属成矿流体的重要形式。湘南地区与钨锡多金属成矿有关的浆液过渡态熔体有两种类型,一种富钠富挥发分,以芙蓉矿田矿化蚀变碱长花岗岩中的钠长石电气石石英囊为代表;另一种富钾富挥发分,以界牌岭矿床矿化蚀变花岗斑岩中的锂白云母萤石囊(团块)为代表。两种浆液过渡态熔体可形成于同一矿床,为同期岩浆活动产物,成分上K₂O与Na₂O负相关,表明它们具有密切的时空和成因联系,熔体-流体包裹体发育,为高度分异的花岗质岩浆液态不混溶产物。两种浆液过渡态熔体富含成矿物质,与成矿关系密切,湘南地区多数钨锡多金属矿床的云英岩型、构造蚀变带型、钾化花岗岩型钨锡多金属成矿可能与富钾富挥发分的浆液过渡态熔体有关,钠化花岗岩型铌钽矿化与富钠富挥发分的浆液过渡态熔体有关。     

内蒙古撰山子金矿床流体包裹体特征与矿床成因

撰山子金矿床位于内蒙古台隆东段北缘华北克拉通与兴蒙造山带的结合部位.矿体赋存于下二叠统于家北沟组灰岩、中二叠世流纹岩和中三叠世花岗斑岩中,被晚三叠世闪长岩所截切.本文在查明矿床地质特征的基础上,对各成矿阶段热液矿物中的流体包裹体开展研究,查明了矿床成矿流体性质、演化特征及其与金成矿的关系.成矿阶段按从早到晚的顺序可分为...     

南海西北陆坡火成岩体地震识别及分布规律

本文根据南海西北陆坡西沙海区及周缘地球物理资料,分析了火成岩体的形态特征及识别特征,并结合南海及周缘地区岩石学测年数据,对该区火成岩进行了期次划分,总结了各期分布规律。研究发现,本区火成岩体代表性产状主要有平柱状、锥状的喷出型,及星状刺穿侵入型。利用地震反射特征通过火成岩体与围岩接触总结了三个判断火成岩形成时代的标准分别为:接触关系、上覆地层沉积厚度及两侧地层对比,从而识别出同扩张期火成岩,并将本区火成岩形成时代分为三期:南海扩张期(32~16 Ma),岩浆活动主要集中在西北次海盆和西沙隆起边界,琼东南盆地及中建盆地也有零星分布;扩张结束后的早期(16~5.5 Ma),岩浆活动规模小、数量少,只零星分布在西沙隆起内,研究区的其他地方并不存在该期岩浆活动;扩张结束后的晚期(5.5 Ma至今),火成岩体个体面积较小、数量众多、分布广泛,几乎在全区都有分布,并可见部分该期火成岩与南海扩张期的火成岩呈明显的继承关系。本研究证实南海扩张期间,陆坡虽有岩浆活动,但较之火山型张裂边缘其规模较小,没有形成大火成岩省,也没有发现火山型张裂边缘中典型的向海倾斜反射(SDR),为南海北部陆缘是岩浆匮乏型张裂陆缘这一观点提供了坚实的依据。扩张结束后的晚期,即自5.5 Ma以来岩浆活动剧烈,与莺歌海盆地、琼东南盆地及西沙海区异常热沉降直接相关,并推测该期岩浆活动可能与海南地幔柱有关。     

陕西省双王金矿床成矿流体特征及其地质意义

双王金矿位于陕西省太白县西南部,矿床赋存于秦岭泥盆系地层中。双王金矿床8号、9号、7号、5号、6号、2号矿体内热液矿物流体包裹体系统研究表明:成矿早期、主成矿期和成矿后期包裹体均一温度主要范围分别为300～463℃、220～340℃和100～279℃。主成矿期成矿流体具有低盐度(2.1%～22.7%NaCleqv)、富CO2和含有N2、CH4等气体的特征。从矿区东部向西部成矿压力有逐渐降低的趋势,流体体系趋于开放。成矿流体来源较为复杂,以岩浆水和变质水为主,后期有大气降水的混入。包裹体的多样性及演化特征和角砾岩型矿化特征显示双王金矿床成矿流体具有不混溶性特征,成矿压力约为100～170 MPa。流体的减压沸腾是导致金沉淀成矿的重要原因。     

Contrasting sulphide contents of the Bushveld and Sudbury Igneous Complexes

The Sudbury Igneous Complex (SIC) contains abundant sulphides, especially near the base, and hosts one of the worlds largest nickel and copper deposits. The Bushveld Complex (BC) contains relatively little sulphide, but hosts the worlds largest platinum-group element deposits. The most recent calculations of the sulphur solubility in magmas that produced the BC are based on the sulphur solubility of mid-ocean ridge basalts that have less SiO₂ than Bushveld magmas. Such a difference may lead to an overestimation of sulphur solubility by as much as 25%. The revised sulphur solubility curve presented here for Bushveld magmas may also have relevance to the SIC in view of its siliceous nature. Sulphur solubility curves can be used to determine the proportion of sulphide expected in cumulate rocks once sulphur saturation is attained. These models are tested using observed sulphide contents in both intrusions. The observed decreasing sulphur contents (>0.3–0.05% S) from the base of the SIC upward are broadly consistent with these sulphur solubility curves, and are consistent with sulphide saturation through the entire mafic portion. In contrast, the lower half of the BC contains extremely little sulphur (generally <0.02% S), except for two thin layers, which is not consistent with sustained sulphide saturation at any level. Previous interpretations of the sulphur content of Bushveld rocks have suggested that the Lower and Critical Zones were sulphide saturated, but that they had then lost some of the sulphide due to various processes. The present sulphide content of the cumulates of the BC is so low that, if they had once been saturated, over 90% of all the sulphide must have been removed. Mass balance calculations indicate that these large amounts of displaced sulphur remain unaccounted for in such models. Instead, the observed sulphur contents are in reasonable agreement with that expected in a cumulate sequence forming from a sulphur-undersaturated magma. Whereas the Merensky Reef and Bastard pyroxenite contain minor sulphides, the compositions of the immediate hanging wall rocks indicate sulphide undersaturation. Such an abrupt return to sulphide undersaturation is not consistent with models involving sulphide formation from large volumes of magma. One possible explanation for these two observations is that intermittent sulphur degassing occurred through a fractured roof of the BC, so that the magma was never continuously sulphur-saturated with respect to an immiscible sulphide liquid.     

厄立特里亚Koka金矿床成矿流体特征及其地质意义

厄立特里亚Koka金矿床产于努比亚地盾新元古代浅变质岩系中,矿体主要赋存于Koka微晶花岗岩内,受剪切构造控制,是在该国发现的大型造山型金矿床。矿床含金石英脉中石英中赋存的原生流体包裹体分为富CO_2包裹体、CO_2-H_2O包裹体和H_2O包裹体共3种类型,以大量发育富CO_2包裹体与CO_2-H_2O包裹体为特征。成矿流体具有富CO_2、中低温(210～360℃)、中低盐度(w(NaCl_(eq))=2.24%～8.51%)的特征。流体中阳离子主要为Na~+与少量K~+,阴离子为Cl~-与少量SO_4~(2-),气相成分主要为CO_2与H_2O,基本不含其他气体组分,流体属于NaCl-H_2O-CO_2体系。成矿流体密度变化范围较大(0.597～0.969 g/cm~3),其中高密度的富CO_2包裹体捕获的最小P-T条件为260～360℃、100～270 MPa,形成于区域变质作用时期。成矿流体的δD_(V-SMOW)范围为-57‰～-50.1‰,δ~(18)O_水范围为1.4‰～3.2‰,表明Koka金矿床成矿流体主要来源于变质热液,并伴有大气降水的混入。成矿流体中CO_2-H_2O包裹体气相分数变化范围很大(15%～80%),与之共生的H_2O包裹体具有相似的盐度以及较低的均一温度,表明初始的CO_2-H_2O型流体发生了不混溶作用,导致相分离,产生的大量富CO_2流体,并使金大量沉淀。     

西藏冈底斯罗布真铅锌矿床成矿流体特征

西藏罗布真铅锌矿床位于冈底斯西缘,其矿体主要产于古新世林子宗群英安岩及斑状二长花岗岩中,并受断裂控制。成矿过程可分为石英-黄铁矿阶段(Ⅰ)和石英-多金属硫化物阶段(Ⅱ)。Ⅰ阶段石英中分布三种类型的包裹体,即:纯气相包裹体(成分为CO2或CH4)、水溶液包裹体(液相组分主要为H2O,含微量CO2,气相组分主要为H2O和CO2)和含子矿物多相包裹体。Ⅱ阶段石英中的包裹体类型及对应的成分与Ⅰ阶段石英大体相似,但部分水溶液包裹体气液相成分均为H2O;Ⅱ阶段闪锌矿中分布水溶液包裹体和含子矿物多相包裹体,二者液相组分和气相组分主要为H2O,子矿物为方解石。Ⅰ阶段包裹体均一温度集中在200~320℃,盐度集中在8%~16%Na Cleqv,Ⅱ阶段包裹体均一温度集中在180~240℃和280~320℃两个区间,盐度集中在6%~12%Na Cleqv。成矿流体为中温、中低盐度的H2O-Na Cl±CO2体系。成矿流体的δDH2O值为-91‰~-125‰,δ18OH2O值为3.9‰~6.6‰,表明其来源主要为岩浆水。以气液相分离为标志的流体不混溶是矿区硫化物沉淀的重要机制。     

贵州太平洞金矿床流体包裹体特征及流体不混溶机制

太平洞金矿床是兴仁-安龙金矿带灰家堡金矿区的重要卡林型金矿之一。流体包裹体研究证明,石英-黄铁矿阶段(Ⅰ)、石英-黄铁矿-毒砂阶段(Ⅱ)、石英-方解石-雄黄阶段(Ⅲ)的包裹体类型丰富,以气液水两相包裹体、CO₂-H₂O包裹体和纯液相水包裹体为主,CO₂两相包裹体、纯气相有机质包裹体和有机质-H₂O包裹体次之,偶见气液有机质包裹体。由Ⅰ→Ⅱ→Ⅲ阶段,气液水包裹体均一温度(200～260℃→180～240℃→100～160℃)呈现逐渐降低的趋势。在Ⅰ阶段的石英中,只在局部偶见到CO₂-H₂O包裹体和气液两相水包裹体共生;在Ⅱ阶段的石英中,纯液相水包裹体、气液两相盐水包裹体、CO₂-H₂O包裹体、CO₂包裹体及纯气相有机质包裹体共存,它们共生在同一平面中且气液两相盐水包裹体和CO₂-H₂O包裹体测温数据相差不大,说明当时捕获的是不均匀成矿流体,它是由含有机质的成矿流体经历了CO₂-低盐度水的不混溶作用形成的。因而认为,太平洞金矿床中成矿早期流体不混溶作用不明显,主成矿阶段流体的不混溶作用是导致金矿质沉淀的重要原因。     

藏南拆离系锑金成矿特征与成因模式

藏南拆离系是一条重要的锑、金成矿带,呈东西向平行于变质核杂岩带展布。通过对典型矿床成矿特征的研究,识别出3种主要矿床类型:1沙拉岗式锑矿床:受南北向正断层和东西向层间断层控制,矿体为石英-辉锑矿脉,围岩蚀变较弱;2马扎拉式锑-金矿床:主要受间断层控制,局部与南北向断层相关,矿体主要由含金石英-辉锑矿脉体群组成,硅化、绢云母化、绿泥石化和碳酸盐化等围岩蚀变发育;3浪卡子式金矿床:位于变质核杂岩周缘,受剥离断层和正断层控制,矿体呈石英细脉和蚀变岩构成的透镜体,硅化、绿泥石化和绢云母化蚀变强烈。石英流体包裹体测温表明,流体主要为低温和低盐度流体。氢、氧、硫同位素研究显示,沙拉岗式锑矿床具有西藏地热水的特征(δD值为-140‰~-166‰),而马扎拉式锑-金矿床为岩浆水与大气降水的混合,两者的硫同位素大多具有岩浆硫的特征。矿床的形成与变质核杂岩驱动的地热系统密切相关,在变质核杂岩附近形成浪卡子式金矿床,向外形成马扎拉式锑-金矿床,远离核杂岩形成沙拉岗式锑矿床。     

Structural Characteristics and Formation Mechanism in the Micangshan Foreland,South China

Lying at the junction of the Dabashan,Longmenshan and Qinling mountains,the Micangshan Orogenic Belt coupled with a basin is a duplex structure and back-thrust triangular belt with little horizontal displacement,small thrust faults and continuous sedimentary cover.On the basis of 3D seismic data,and through sedimentary and structural research,the Micangshan foreland can be divided into five subbelts,which from north to south are:basement thrust,frontal thrust,foreland depression-back-thrust triangle,fore...     

Structural Characteristics and Formation Mechanism in the Micangshan Foreland,South China

Lying at the junction of the Dabashan, Longmenshan and Qinling mountains, the Micangshan Orogenic Belt coupled with a basin is a duplex structure and back-thrust triangular belt with little horizontal displacement, small thrust faults and continuous sedimentary cover. On the basis of 3D seismic data, and through sedimentary and structural research, the Micangshan foreland can be divided into five subbelts, which from north to south are: basement thrust, frontal thrust, foreland depression-back-thrust triangle, foreland fold belt or anticline belt, and the Tongjiang Depression. Along the direction of strike from west to east, the arcuate structural belt of Micangshan can be divided into west, middle and east segments. During the collision between the Qinling and Yangtze plates, the Micangshan Orogenic Belt was subjected to the interaction of three rigid terranes: Bikou, Foping, and Fenghuangshan (a.k.a. Ziyang) terranes. The collision processes of rigid terranes controlled the structural development of the Micangshan foreland, which are: (a) the former collision between the Micangshan-Hannan and Bikou terranes forming the earlier rudiments of the structure; and (b) the later collision forming the main body of the structural belt. The formation processes of the Micangshan Orogenic Belt can be divided into four stages: (1) in the early stage of the Indosinian movement, the Micangshan-Hannan Rigid Terrane was jointed to the Qinling Plate by the clockwise subduction of the Yangtze Plate toward the Qinling Plate; (2) since the late Triassic, the earlier rudiments of the Tongnanba and Jiulongshan anticlines and corresponding syncline were formed by compression from different directions of the Bikou, Foping and Micangshan-Hannan terranes; (3) in the early stage of the Himalayan movement, the Micangshan-Hannan Terrane formed the Micangshan Nappe torwards the foreland basin and the compression stresses were mainly concentrated along both its flanks, whereas the Micangshan-Hannan Terrane wedged into the Qinling Orogenic Belt with force; (4) in the late stage of the Himalayan movement, the main collision of the Qinling Plate made the old basement rocks of the terrane uplift quickly, to form the Micangshan Orogenic Belt. The Micangshan foreland arcuate structure was formed due to the non-homogeneity of terrane movement.     

新疆若羌县柯可•卡尔德钨锡矿床地质特征与流体包裹体研究

地处东、西昆仑与阿尔金构造带结合处的白干湖是近年在我国西北地区勘查发现的一处具超大型远景规模的钨锡矿田,包括柯可卡尔德、白干湖、巴什尔希和阿瓦尔四个矿床。其中,柯可卡尔德钨锡矿勘查程度最高、规模最大,野外调查发现其含矿石英脉体有沿走向扭动、雁列式排列、产状低缓等特征,热液活动则可明显分为成矿前、成矿期和成矿后三期作用。该矿床流体包裹体主要有汽液两相、含子盐汽液三相、单一液相(包括纯水和纯 CO2型)、含 CO2汽液三相、同时含CO2和子盐汽液四相等5种类型,成矿前石英以前两种包裹体为主,亦有少量含 CO2汽液三相型;成矿期可分为早、晚两个阶段,早阶段是钨锡的主成矿阶段,包含五种类型包裹体,晚阶段表现为弱的硫化物矿化,主要为汽液两相型;成矿后石英包裹体主要为汽液两相型。显微测温与激光拉曼探针分析表明成矿流体主要成分为 H2O和 CO2,气相含少量 CH4和 N2;氢、氧同位素研究结果显示三期流体分别主要为变质热液、岩浆热液和大气降水。该矿床系中高温、中低盐度的岩浆热液矿床,流体经历了不混溶作用和混合作用,这可能是促使矿质沉淀的主要因素。     

藏南拉木由塔锑(金)矿床成矿流体特征及成矿机制初探

西藏拉木由塔锑(金)矿床位于藏南Sb-Au成矿带东段,矿(化)体主要赋存于中侏罗统遮拉组地层与辉绿(玢)岩脉接触带上。研究表明：石英中的流体包裹体普遍较小,主要为富液相的气液两相包裹体,形态复杂多样,主要呈长条状、浑圆状、椭圆状及不规则状。方解石中的包裹体普遍较大,也都为富液相的气液两相包裹体,形态简单,以负晶形及不规则状为主。包裹体显微测温结果显示,均一温度范围为150～344 ℃,盐度(NaCl)介于0.53%～9.61%,密度介于0.55～0.93 g/cm³,成矿压力变化于39～83 MPa,表明成矿过程主要在中低温条件下进行,成矿流体为低盐度、低密度流体。从成矿早期到晚期,流体包裹体的均一温度、盐度、压力不断降低。氢-氧同位素地球化学研究表明,含矿石英脉δDV-SMOW变化范围为-137‰～-163‰,δ¹⁸O_H2O变化于9.42‰～14.58‰,含矿方解石δDV-SMOW变化范围为-148‰～-151‰,δ¹⁸O_H2O变化于-9.83‰～-17.02‰,成矿流体中的水主要来自大气降水。该矿床成矿物质的沉淀主要是由水岩反应和混合作用引起的。     

新疆东准噶尔南明水金矿床成矿流体特征：流体包裹体及氢氧同位素证据

新疆东准噶尔南明水金矿床位于卡拉麦里成矿带东段,矿体受NW—NWW向韧-脆性断裂控制,赋矿围岩为下石炭统姜巴斯套组的浅变质海相火山碎屑-沉积岩。以流体包裹体和氢、氧同位素为研究手段,查明了矿床成矿流体性质、来源及其演化特征与金成矿的关系。其热液成矿过程可划分早、中、晚3个阶段,石英中原生包裹体主要有CO2-H2O包裹体、水溶液包裹体和纯CO2包裹体3种类型。早阶段石英中以CO2-H2O包裹体和纯CO2包裹体为主,均一温度变化于257~339 ℃,盐度为04%~22%;中阶段石英中3种类型包裹体均发育,CO2-H2O包裹体和水溶液包裹体均一温度为196~361 ℃,盐度为04%~60%;晚阶段石英中仅见水溶液包裹体,均一温度相对较低,为174~252 ℃,盐度为14%~32%。由CO2-H2O包裹体计算的早、中阶段捕获压力分别为214~371 MPa、236~397 MPa,对应的成矿深度分别为81~140 km、89~150 km。成矿流体由早、中阶段的CO2-H2O-NaCl±CH4体系演化至晚阶段贫CO2的H2O-NaCl体系,成矿温度和流体密度呈逐渐降低趋势,盐度变化不大。流体包裹体和氢、氧同位素研究表明,主成矿阶段成矿流体主要来源于变质水,CO2-H2O-NaCl流体的不混溶是导致Au富集成矿的重要机制,南明水金矿属于中深成造山型金矿床。     

Immiscibility of high salinity fluids in volcanic rocks and the mechanism of magma degassing in the Dongying sag, eastern China

Fluid inclusions that bear halite daughter minerals were discovered in volcanic rocks at Pingnan area in the Dongying sag. The samples of the fluid inclusions collected from the BGX-15 well drill cores are hosted in quartz of diorite-porphyrite. The daughter minerals are identified as NaCl crystals after being observed under a microscope and analyzed by in situ Raman spectroscopy at −185°C. The results of micro-thermal analysis show that the homogenization temperatures of primary fluid inclusions are between 359 and 496°C, and the salinities of fluid inclusions are from 43.26 to 54.51 wt-%. All fluid inclusions in the studied samples can be divided into five types including primary fluid inclusions and secondary fluid inclusions. The fact that five types of fluid inclusions were symbiotic in the same quartz grain implies that immiscibility happened in magma. Due to the decrease in temperature and pressure during the ascent of magma, the fluids became intensively immiscible. This process accelerates the degassing of CO₂ from magma, but the remnant fluids with high salinity are preserved in fluid inclusions. Thus, the primary fluid inclusions are mainly in NaCl-H₂O fluids and poor in CO₂. The results of our study indicate that the degassing of magma and accumulation of CO₂ gas at the Pingnan area are relative to the immiscibility of high salinity fluids. This discovery is important because it can help us have a further understanding of the mechanism of magma degassing and accumulation of the inorganic CO₂ in eastern China. Translated from Acta Geologica Sinica, 2006, 80(11): 1699–1705 [译自: 地质学报]     

尖峰岭似伟晶岩内黄玉中的熔流包裹体

详细叙述了熔流包裹体以及与之密切共生的熔融包裹体和流体包裹在分布关系、组成相态及其比例、流体成分、硅酸盐溶体分子网络聚合结构以及各种包裹体在加热－淬火－冷冻过程中的热变化行为和均一化温度及其途径等各方面的特殊和异同点。认为这种熔流包裹体是在岩浆演化末期从岩浆（熔融体）与水（流体）的不混溶体系中以任意比例同时将其捕获所至,因而,它具有重要的理论意义和实际意义。