海南富文金矿床矿石、围岩及地层元素地球化学特征及地质意义

海南富文金矿床位于华南褶皱系五指山褶皱带北缘，主要出露早白垩世鹿母湾组（K1l）含砾碎屑沉积岩。金矿体呈脉状和似层状赋存于鹿母湾组砂岩层间破碎带中。为进一步探讨富文金矿的成矿物质来源，对石英脉型矿石、赋矿围岩鹿母湾组碎屑沉积岩及岩浆岩进行主量、微量和稀土元素测试分析。结果显示：矿石与围岩地层、岩浆岩具有相似的微量元素变化趋势以及相似的稀土配分模式，预示着成矿与地层、岩浆岩关系密切。早白垩世石英闪长岩、细粒花岗岩和碎屑沉积岩均为矿体的形成提供了成矿物质，矿床类型为岩浆热液型金矿。     

胶东郭城金矿稀土元素地球化学特征及其对成矿的指示意义

郭城金矿位于胶莱盆地东北缘,矿体产出与荆山群地层,矿化类型以黄铁矿化和磁黄铁矿化为主,相比胶东其它金矿床成矿地质条件较为特殊。采用ICP-MS方法分别对郭城金矿矿石、牧牛山岩体和中基性脉岩中的稀土元素的组成进行了测定,探讨了成矿物质和成矿流体来源的问题。结果显示,矿石稀土元素配分曲线具有右倾型和平坦型两种型式。具平坦型配分曲线特征的矿石与花岗岩稀土元素配分曲线型式接近,二者具有较强的相关性;具右倾型配分曲线特征的矿石与脉岩的曲线型式类似,二者的相关性较好。晚期碳酸盐化的矿石具有极高的稀土含量。脉岩Eu异常不明显,矿石和花岗岩均具明显的Eu负异常。表明了成矿物质来源于牧牛山岩体和地壳深部,成矿流体来源于深部岩浆演化,矿床的形成具有多期次性。     

云南金平长安金矿床稀土元素特征及其地质意义

通过长安金矿床不同类型矿石、岩浆岩和白云岩地层稀土元素地球化学对比研究,结合显微镜蚀变矿化特征观察,对该矿床与不同类型地质体成因关系进行讨论。石英正长斑岩、正长斑岩、正长岩、煌斑岩、辉绿岩稀土配分曲线均为右倾型,配分模式相似,指示矿区内三类长英质岩石和中基性煌斑岩、辉绿岩可能为同源岩浆演化产物。毒砂矿化原生矿石与弱黄铁矿化原生矿石相比,Eu负异常程度低,而矿区内煌斑岩与辉绿岩具有弱负Eu异常,指示毒砂矿化作用可能与煌斑岩与辉绿岩岩浆活动有关。黄铁矿化白云岩比无蚀变白云岩稀土元素总量（∑REE）要高,但两者稀土配分模式基本一致,指示黄铁矿化成矿热液稀土元素特征与白云岩稀土元素特征相似,推断黄铁矿化热液可能来源于白云岩变质热液。     

黑龙江省逊克县高松山金矿区岩石地球化学特征

通过对高松山金矿床特征、地球化学特征的分析研究,认为高松山金矿床为浅成低温热液型金矿床,成矿地层是甘河期火山岩,以亚碱性系列之钙碱性高钾火山岩为特征。火山岩稀土元素分析结果表明,该火山岩属轻稀土富集型,铕无明显异常,稀土配分曲线为平缓的右倾。岩石微量元素曲线形态基本相似,表明岩浆具有同源特点。火山岩成因类型为壳-壳幔活动大陆边缘的产物。岩浆演化以分异作用为主,并受一定陆壳混染。     

再论北票二道沟金矿床成矿物质来源

辽宁北票二道沟金矿床成矿物质,来源于太古界片麻岩及燕山晚期岩浆岩。以前曾认为燕山晚期岩浆岩属于重熔型花岗质岩石,但经过笔者对岩石和矿石的稀土元素、同位素及岩石地球化学指标等方面研究表明：不是重熔型花岗质岩石,而是同熔型花岗质岩石。这种新认识为研究二道沟金矿床成矿地质地球化学条件及成因探讨、加强二道沟矿床进一步深入工作及扩大找矿范围．拓宽了思路。     

康定大渡河金矿田稀土元素地球化学特征研究

大渡河金矿田是西南地区重要的金成矿集中区,在该区开展稀土元素地球化学特征研究,可为揭示大渡河金矿田成因提供一定的依据。通过含矿石英脉体与围岩的稀土元素特征来探讨康定大渡河流域金矿床的成矿物质及流体来源。采集相关岩矿石样品,测试其稀土元素组成。研究表明,岩矿石均具有轻稀土富集的特征,这是地幔流体作用成矿的标志。含矿脉石英δEu值小于1,是金矿的主要赋存地质体,闪长岩、花岗岩和角闪岩δEu值小于1或约等于1,构成金脉围岩体系。闪长岩、花岗岩和角闪岩稀土配分曲线比较平缓,轻重稀土元素分馏不明显,说明黄金矿矿体与早期围岩无关,属于后期填充,成矿与中新生代造山过程有关。而源于地幔流体的含矿脉石英以及围岩花岗岩具有与地壳相似的稀土元素特征,说明成矿过程中发生了强烈的壳幔物质交换混染。多数样品中Eu亏损并未见Ce异常情况,这说明大渡河金矿床的成矿流体及围岩形成环境具有中高温并且相对氧化性的特征,表明了大渡河金矿床的成矿流体可能属于源于地幔的中高温热液流体。     

江苏甘家巷铅锌矿区稀土元素地球化学特征及指示意义

对江苏南京甘家巷矿区铅锌矿床不同类型岩石和矿石的稀土元素地球化学特征进行研究,探讨了岩石和矿石中稀土元素地球化学行为。结果显示：矿床中稀土元素的分布较为一致;甘家巷矿区稀土元素总量变化大,总体来看,稀土总量在铅锌矿石、底砾岩和粉砂岩中相对富集;在稀土元素配分模式图上,轻稀土相对富集,稀土配分曲线向右缓倾,轻稀土元素随原子序数的增加富集程度降低,重稀土元素分布比较平坦。相对较稳定;稀土元素地球化学特征指示甘家巷矿区为受F₂断裂和不整合面控制的中低温热液矿床。     

贵州下岳某矿床稀土元素地球化学特征及物源探讨

文章以贵州省下岳矿床为研究对象,从稀土元素地球化学入手,初步总结了下岳矿床矿石的稀土元素地球化学特征,发现其稀土元素总量不高,LREE/HREE值较小,标准化配分曲线近于水平,δCe值较小,具有明显的负异常,这与海水的稀土元素配分模式极其相似,推测铀源可能来自同生沉积的海水,且煤层及有机质在沉积成岩过程中吸附海水中的铀,导致铀的初步富集,在后期受到褶皱构造作用的改造下完成二次叠加富集成矿。     

青城子矿田杨树金银矿床地质特征及成矿机制初探

杨树金银矿床赋存于辽东裂谷辽河群大石桥组大理岩与盖县组变粒岩互层过渡带中，容矿岩石主要为变粒岩、大理岩和硅质岩。矿床分布严格受推覆构造及其剪切作用形成的北东向剪切构造与层间剥离构造控制。成矿物质来源具有多源性，以深成火山喷流体为主，岩浆热液流体叠加混合形成成矿热液。因此杨树金银矿床成矿过程中地层岩性是成矿的基础，韧性剪切构造作用是条件，岩浆热液（硅化）是成矿关键。据此可以认为杨树矿床具有火山喷流-韧性剪切-岩浆热液叠加的成矿模式。     

四川省道孚县农戈山铅锌矿地质特征及找矿方向

农戈山铅锌矿位于青藏川滇缅印尼"歹"字型构造体系与川滇南北构造带西缘交汇处,主要赋存于中生代中三迭统杂谷脑组地层与花岗岩体内接触带及外接触带的角岩内,矿体严格受NNW、近NS断裂带控制,从矿体形态、产状、规模及品位,矿石类型、组成及组构,围岩蚀变等方面论述了矿床的地质特征。主要控矿因素是地层、断裂构造和岩浆活动,其中断裂构造是最主要的控矿因素。通过对矿石S、Pb同位素分析和成矿温度、成矿时代研究表明,成矿物质来源于地层和岩浆岩,成矿温度为中低温,成矿时代为燕山期。认为该矿床成因类型为深源构造-热液成因,并具有多期成矿特征。同时,还归纳了主要找矿标志,为在该区内寻找这一类型矿床提供帮助。     

Rare Earth Element Geochemistry on Magmatic Rocks and Gold Deposits in Shizishan Ore-Field of Tongling, China

REE geochemical characteristics of the magmatic rocks and gold deposits in Shizishan ore-field of Tongling were studied. Three types of the magmatic rocks have almost the same chondrite-normalized REE patterns, Eu and Ce anomalous values, and ∑REE, ∑LREE/∑HREE regular changes, which indicates that their magmas come from the same source and their digenetic mechanism is fractional crystallization. In three gold deposits, the mineral ores and related altered rocks have similar chondrite-normalized REE patterns and sharp Eu positive anomalous values. The REE contents reduced from the magmatic rocks to skamization or alteration magmatic rocks, skam type ores, sulphide type ores, wall-rocks limestone or marble. The REE geochemical characteristics of the ores and related rocks show that primary fluids originated from magmatic differentiation in lower pressure of shallow crust, ore-forming hydrothermal solutions gained REE and mineralization elements further from leaching the magmatic rocks, then superimposed and reformed the limestones or marbles and deposited ore-forming material.     

Rare Earth Elements Geochemistry of Laowan Gold Deposit in Henan Province： Trace to Source of Ore-Forming Materials

The compositions of REE in quartz and pyrite from the main stage of the Laowan gold deposit in Henan Province and that in quartz from Laowan granite were determined by inductively coupled plasma-mass-spectrometry (ICP-MS) to trace the source of ore-forming materials. Meanwhile, the REE compositions of the deposit ore, granite and metamorphic wall rock were also considered for comparative studies in detail. The range of ∑REE of quartz and pyrite from the deposit ores is 4.18×10-6～30.91×10-6, the average of ∑REE is 13.39×10-6, and the average of ∑REE of quartz in the Laowan granite is 6.68×10-6. There is no distinct difference of REE parameters between the deposit ore quartz and granite quartz. The quartz in gold deposit has the same REE particular parameters as quartzes from Laowan granite, such as δEu, δCe, (La/Yb)N and (La/Sm)N, partition degree of LREE to HREE, especially, the chondrite-normalized REE patterns, but no similarity to those from metamorphic wall rock, which shows that ore-forming hydrothermal fluid is mainly the fluid coming from the Laowan granite magma, rather than metamorphic fluid. Meanwhile, comparison studies on REE features between minerals from the deposit ores and related geological bodies in the deposit show that REE characteristics of minerals can serve as an indicator of ore-forming fluid properties and sources, while the REE characteristics of the bulk samples (such as deposit ores, granites and wall rocks) can not trace the source of the ore-forming materials exactly.     

Geochemical characteristics of rare earth elements and their implications for the Huachanggou gold deposit in Shaanxi Province, China

The Huachanggou gold deposit is located in the south part of the Mian-Lue suture zone in the Qinling orogenic belt. Rare earth element (REE) concentrations determined by ICP-MS are shown to characterize the ore samples and their wall rocks in three ore zones in order to reveal the origin of ore-forming materials and fluid. In AuI, REE chondrite normalized patterns of ore are similar to those of ore-controlling spilite; the ore-forming materials originated from deep magma, and magmatic activity offered main hydrothermal source for gold mineralization. The REE characteristics of AuII and AuIII are similar, and most of the ore samples are similar with the wall rocks. The ore-forming fluids of AuII and AuIII were metamorphic hydrothermal fluids which had extracted ore-forming materials part from the wall rocks, and part from the spilite in AuI.     

河南卢氏官坡—五里川锑矿带稀土元素特征及与成矿的关系

为了研究河南省卢氏县官坡—五里川锑成矿带成矿机制,对其稀土元素地球化学特征进行分析。锑矿带内锑矿石及其他类型岩石轻、重稀土元素比值较高,且都呈现为Eu负异常,稀土元素配分模式总体上表现为轻稀土富集型。锑矿带内各种类型岩(矿)石中稀土总量分布表现出一定规律性,大理岩、锑矿石中稀土元素总量较高,构造带岩石及附近围岩的稀土元素总量偏低,说明锑矿带的锑及成矿热液主要来自于下地壳和上地幔,热液上升过程中锑矿床经历了多阶段的分馏、交代作用,导致稀土元素从围岩中大量迁出,并富集于锑矿床内。     

西昆仑塔什库尔干赞坎铁矿成矿物质来源的锶钕同位素约束

西昆仑赞坎铁矿是塔什库尔干地区新发现的大型富铁矿,其赋矿围岩为布伦阔勒群火山—沉积变质岩系。矿体主要呈层状和似层状分布,矿石具有条带状、浸染状和块状构造。通过研究该矿床赋矿地层、矿石的硫化物钕和锶同位素组成特征,获得矿石硫化物I _Sr=0.7100~0.7111,平均值为0.7103;（¹⁴³Nd/¹⁴⁴Nd） _i =0.511555~0.512223,平均值为0.511827;赋矿围岩布伦阔勒群（¹⁴³Nd/¹⁴⁴Nd） _i =0.511552。Sr-Nd同位素特征表明,成矿物质来源具有壳幔混合特征,主要来自海底火山喷发活动。赞坎铁矿属与海底热液有关的铁矿床,形成于早古生代原特提斯洋向南俯冲的岛弧环境。     

刚果(布)Boko Songho-Mindouli成矿带硫、铅同位素特征及其地质意义

Boko Songho-Mindouli成矿带是刚果(布)南部重要的铜多金属矿成矿远景区。以成矿带中Grande、Luangu、Mpassa和Moubiri 4个典型铜多金属矿床的矿石矿物黄铁矿、辉铜矿为研究对象,测定其硫、铅同位素组成,揭示该矿带成矿物质来源并探讨其成矿机制。结果表明:矿石矿物δ~(34)S值变化于-1.4‰~23.0‰,平均7.29‰,反映其兼有幔源岩浆成因和生物成因的特点;矿石矿物的~(206)Pb/~(204)Pb值的变化范围为17.810~18.046,~(207)Pb/~(204)Pb值的变化范围为15.592~15.651,~(208)Pb/~(204)Pb值的变化范围为37.719~38.066,其特征显示铅来源具有多源性,而以壳源为主,同时混有深源地幔铅。硫、铅的来源相同,具有相似的地质演化史,矿床属于沉积—热液改造型矿床,受地层和构造控制。     

Trace Elements and Rare Earth Elements of Sulfide Minerals in the Tianqiao Pb-Zn Ore Deposit, Guizhou Province, China

Trace elements and rare earth elements(REE)of the sulfide minerals were determined by inductively-coupled plasma mass spectrometry.The results indicate that V,Cu,Sn,Ga,Cd,In,and Se are concentrated in sphalerite,Sb,As,Ge,and Ti are concentrated in galena,and almost all trace elements in pyrite are low.The Ga and Cd contents in the light-yellow sphalerites are higher than that in the brown and the black sphalerites.The contents of Ge,Ti,In,and Se in brown sphalerites are higher than that in light-yellow sphalerites and black sphalerites.It shows that REE concentrations are higher in pyrite than in sphalerite,and galena.In sphalerites,the REE concentration decreases from light-yellow sphalerites,brown sphalerites,to black sphalerites.The ratios of Ga/In are more than 10,and Co/Ni are less than 1 in the studied sphalerites and pyrites,respectively,indicating that the genesis of the Tianqiao Pb-Zn ore deposit might belong to sedimentary-reformed genesis associated with hydrothermal genesis.The relationship between LnGa and Lnln in sphalerite,and between LnBi and LnSb in galena,indicates that the Tianqiao Pb-Zn ore deposit might belong to sedimentary-reformed genesis.Based on the chondrite-normalized REE patterns,δEu is a negative anomaly(0.13-0.88),andδCe does not show obvious anomaly(0.88-1.31); all the samples have low total REE concentrations(<3ppm)and a wide range of light rare earth element/high rare earth element ratios(1.12-12.35).These results indicate that the ore-forming fluids occur under a reducing environment.Comparison REE compositions and parameters of sphalerites,galenas,pyrites,ores,altered dolostone rocks,strata carbonates,and the pyrite from Lower Carboniferous Datang Formation showed that the ore-forming fluids might come from polycomponent systems,that is,different chronostratigraphic units could make an important contribution to the ore-forming fluids.Combined with the tectonic setting and previous isotopic geochemistry evidence,we conclude that the ore-deposit genesis is hydrothermal,sedimentary reformed,with multisources characteristics of ore-forming fluids.