凡口铅锌矿床地球化学特征及成矿作用分析

凡口铅锌矿床是发育于碳酸盐岩建造中的海底热泉喷溢沉积矿床,以“一大二富三集中”的特点和典型的地质地球化学特征吸引着中外矿床地质工作者。常量元素和矿化元素的分布、矿物包裹体特征、稀土元素组成和硫同位素组成反映出该矿床与外生作用有关。铅同位素组成具有壳源和地下地壳来源铅的特征,矿物包裹体水氢、氧同位素组成表明,成矿溶液可能与深层建造水有关,后期与大气降水有关。矿区主要矿层经历海底热泉喷溢沉积－成岩的演     

凡口铅锌矿床海底热泉喷溢成矿的物理化学环境

凡口铅锌矿是发育于碳酸盐岩建造中的海底喷溢沉积矿床 ,以“一大二富三集中”的特点和典型的地质地球化学特征吸引着中外矿床地质工作者。叠层状矿体发育于同沉积断裂的旁侧 ,矿层与灰岩呈沉积接触关系。矿石具沉积碎屑组构 ,黄铁矿、闪锌矿具外生特征。稀土元素组成和硫同位素组成反映矿床与同生作用有关。铅同位素组成具有壳源和下地壳来源铅的特征。矿区主要矿层经历海底热泉喷溢沉积—成岩的演化     

喷气沉积矿床特征及找矿标志

本文所探讨的喷气沉积矿床不包括火山或次火山喷气沉积矿床,而是指生于海底环境,与地热体系有关的形成于裂谷及深断裂系统中的矿床。过去将它们与海相火山岩型块状硫化物矿床或其外侧边缘远口相的海底火山热泉型矿床混为一谈,然而近年来经国内外学者的深入研究,发现它们具有独特的形成机制和地质特征,并且往往形成一些大型、超大     

青海省铁矿时空分布、成矿系列及成矿模式

依托青海省矿产地质志研编项目,在收集矿产勘查、科研成果资料以及调研典型矿床的基础上,对青海省铁矿时空分布、成矿系列和成矿模式进行了研究,取得以下主要成果:1)青海省铁矿床主要形成于元古代、寒武纪—奥陶纪和三叠纪,自北向南成矿时代由老变新,空间上主要分布于祁连、东昆仑构造带,祁连构造带以产出寒武纪—奥陶纪海相火山-沉积型铁矿床为特色,东昆仑构造带主要产出元古代沉积变质型和三叠纪接触交代矽卡岩型铁矿床;2)将青海省铁矿床划分为九个矿床成矿系列;3)厘定了青海省主要类型铁矿床产出的构造环境,认为元古代沉积变质型铁矿产于大陆边缘,寒武纪—奥陶纪及二叠纪—三叠纪海相火山-沉积型铁矿产于大陆裂谷、岛弧或弧后盆地,三叠纪接触交代矽卡岩型铁矿产于碰撞-后碰撞造山带;4)概述了九个系列矿床成矿特征,建立了元古代沉积变质型、寒武纪—奥陶纪海相火山-沉积型、二叠纪—三叠纪海相火山-沉积型、三叠纪接触交代矽卡岩型4个主要矿床成矿系列的成矿模式。     

论石门雄黄矿床硅质岩的热水成因

湖南石门雄黄矿床附近存在大片硅质岩。硅质岩是热泉沉积的硅华，其微量元素组成与矿石中以及该区现代热泉体系沉积物类似，成矿溶液富Ｎａ＋、Ｃａ２＋、Ｃｌ－、ＨＣＯ３－、ＳＯ２－４，与该区现代热泉类似。根据岩石学、岩石化学特征，结合微量元素、稀土元素与同位素等综合研究表明：矿床附近硅质岩为热水沉积成因，硅质可能来自下伏及深部地层。     

甘肃白银厂和青海德尔尼黄铁矿型铜矿与塞浦路斯铜矿的成因对比

论述了甘肃省白银厂和青海省德尔尼黄铁矿型铜矿床的地质背景、成矿特征和成因,并与塞浦路斯的一些铜矿床进行了对比,认为这些矿床的特征与现代大洋硫化物矿床的特征基本一致,当属海底热泉成因的硫化物矿床。文中提出了热泉成因矿床的一般模式。同时分析了各矿床成矿作用的特殊性。     

粤北凡口超大型铅锌矿床化流体喷溢中心的确定

凡口铅锌矿床是发育于上古生界碳酸直岩建造中的海底热泉喷溢矿床,在研究矿地质的基础上,使用矿物包裹体测温方法,研究矿体温度场的分布,配合矿化元素的分布状态和矿石组构分带特征,推断成矿流体的喷口位置和运移方向。     

湖北徐家山锑矿床特征、稳定同位素组成及其成矿机理的初步探讨

徐家山锑矿床产在上震旦统陡山沱组和灯影组海相碳酸盐岩地层中。矿石中含有硒。矿床成因类型属于沉积-渗流热水成矿溶液改造富集型层控锑矿床。本文在论述矿床地质特征、成矿阶段的划分、矿物包裹体特征及稳定同位素地球化学等研究成果的基础上,探讨了该矿床的成矿机理。     

西藏南部车穷卓布锑矿矿床成因及成矿规律初探

通过对车穷卓布锑矿的区域地质背景、矿床地质特征总结,探讨了车穷卓布锑矿成因与热泉作用密切相关,为"热泉型"锑矿床。在此基础上,分析了江孜-隆子成矿带锑矿床的成矿规律。     

二连盆地努和廷铀矿床成矿作用及成矿模式

通过研究努和廷铀矿床地质特征、成矿作用及地球化学特征,认为努和廷矿床为同生沉积后生改造型铀矿床。晚白垩世二连期湖泊发育区控制了矿床定位。矿床成矿作用经历了同生沉积成矿、后生改造和表生作用3个阶段,成矿年龄为85Ma、（41±5）Ma和6～13Ma。在总结矿床成矿地质特征、成矿作用及地球化学特征基础上,建立了努和廷铀矿床成矿模式。     

广东凡口铅锌矿成因探讨

广东凡口铅锌矿赋存于晚古生代碳酸盐地层中,矿体严格受NNE向断裂及其次级构造控制.矿物流体包裹体均一温度范围115～300℃,平均温度为189℃.矿物爆裂温度155～330℃,众数值220～280℃.矿物δ34S值总体上有δ34SPy>δ34SSp>δ34SGm的趋势;依据硫同位素矿物对样品获得的硫同位素平衡分馏温度介...     

闽中地区铅锌矿床辉石成分特征及其成因意义

文章在研究闽中地区铅锌矿床蚀变矿物组合的基础上,将辉石矿物的化学成分与典型矽卡岩Pb_Zn矿床的辉石成分进行了对比,认为该区铅锌矿床的辉石与典型矽卡岩中的辉石类似,为透辉石和钙铁辉石,富锰,具有远温端矽卡岩辉石的特征。因此推论本区铅锌矿床大部分类似于矽卡岩型Pb_Zn矿床,少数为受断裂控制的热液脉型矿床,是海底火山喷发沉积形成的初始矿源层经变质作用、燕山期构造_岩浆热液顺层交代、强烈叠加改造或活化并重新定位的矿床。     

Minor elements and ore genesis of the Fankou lead-zinc deposit,China

The Fankou Pb-Zn deposit occurs in the Middle-Upper Devonian and Lower Carboniferous carbonate and argillaceous carbonate formations. In principle, the deposit can be classified as a carbonate-hosted strate-bound deposit. Representative sphalerite, galena, and pyrite separates from Fankou have been analysed. For the purpose of comparison a literature survey on minor elements of other districts have been carried out. The comparison of determined data with the quoted data shows that the Fankou sphalerites are rich in Ga, Ge and Ag, but poor in Se and Te; the Fankou galenas are rich in Ag, Hg, Sb and As, but poor in Se, Te, Tl and Bi; the Fankou pyrites are rich in As, Cd and In, but poor in Se, Te, Co and Ni. Zn/Cd and Se/S×10^–4 ratios for sphalerites, Sb/Ag, Sb/Bi and Se/S×10^–4 ratios for galenas and Co/Ni ratios for pyrites from Fankou and other districts have been calculated. Ga-Ge-Ag atomic ratios in sphalerites, Sb-Bi-Ag atomic ratios in galenas and Co-Ni relations in pyrites have been plotted. The average value (311) of Zn/Cd ratios for sphalerites from Fankou is similar to values of sphalerites from Gaobanhe, Heqing, Accesa and Broken Hill. The average Sb/Ag ratio (0.74) and the Sb-Bi-Ag atomic ratios in Fankou galenas are similar to those in the syngenetic galena from the British Island. The Ga-Ge-Ag atomic ratios for Fankou sphalerites are similar to those for the syngenetic sphalerites and Gorno sphalerites. The average Co/Ni ratio (1.1) for micro to fine-grained pyrites from Fankou laminated-bedded pyrite ore is similar to that (0.8) for the sedimentary pyrites from other districts. As to the fine to medium-grained pyrites from Fankou massive pyritic ores, their higher Co/Ni ratios (1.6–1.8) may relate to the fact that more Ni is lost than Co, during the reformation or recrystallization. Sphalerite, galena and pyrite from Fankou all are rather poor in Se and have very low values of Se/S×10^–4, so they may bear no genetic relation to volcanism. To sum up, the following conclusions can be reached: (1) The Fankou deposit possesses some syngenetic features. (2) Evidently it differs from skarn type, hydrothermal type, and volcanogenic type deposits. (3) Surely it is a reformed sedimentary Pb-Zn deposit.     

粤北覆盖区复杂环境隐伏铅锌矿探测技术集成有效性研究

凡口铅锌矿是粤北地区超大型铅锌矿床,发育独特的覆盖区复杂地质环境。本文以凡口铅锌矿为例,在前人研究的基础上,应用高精度磁法、可控源音频大地电磁法、土壤电吸附、氡气、吸附烃-汞气体测量、及导电率等多种物化探勘查技术。通过对凡口矿床及外围进行对比分析和研究,建立凡口矿区有效探测技术集成,优选方法组合为高精度磁法、CSAMT、土壤吸附烃-汞气体及氡气测量,CSAMT中低阻异常、烃-汞正异常重叠区域、在构造有利部位是矿体的主要赋矿部位。结合矿区资料,预测在212剖面线(120~140)号间,宽度约700~800m,62剖面线(60~80)号间,宽度约800m存在两处有利的赋矿异常,为凡口铅锌矿深部找矿预测研究提供切实可行的勘查技术与方法。     

Organically geochemical characteristics of the Fankou Pb-Zn deposit in North Guangdong Province, China： Implication for Pb-Zn enrichment

The Fankou Pb-Zn deposit is a very important and famous deposit in China. The time of Pb-Zn enrichment has been debated for a long time in this deposit. A total of seventeen samples of three sections were taken from the Fankou mine for the study of mineralization time and the mechanism of ore formation. The samples were analyzed by microscope, Soxhlet-extract, GC, and GC/MS methods. The results indicated that organic bulk parameters vary with the Pb-Zn contents in different samples and clearly were influenced by ore sulfide formation. Organically geochemical parameters (MPI 1, CPI) indicate that the paleotemperatures in the Fankou deposit are lower than 80°C in all three sections. Sulfides in the wall rocks might occur mainly during synsedimentation or early diagenesis by BSR or partly by PR, rather than by TSR at such low temperatures, this stage may be the first mineralization stage. Sulfides near the faults might be formed by TSR after sedimentation, this stage may be the second mineralization stage.     

广东凡口铅锌矿床成矿地质特征及资源预测

凡口铅锌矿属特大型矿床,是粤北最重要的有色金属基地之一。近年来,凡口矿区陆续发现了一些厚大矿体,新增铅锌资源量近100×10^4t,初步显示出该矿区良好的找矿前景。通过对该矿床地质勘查及矿山开采资料的研究表明,凡口铅锌矿除受地层因素的制约外,还受到构造破碎带空间展部的限制,主要矿体受印支一燕山期形成的NE—NNE向构造带及其层间滑脱构造控制;进而指出今后找矿工作应部署在NE向构造带的延伸处以及其与早期NW向构造的交汇地带。     

广东凡口铅锌矿床成矿构造动力研究

凡口铅锌矿床位于粤北曲仁构造盆地的北部活动边缘,区域的旋涡构造与矿区弧形构造为对应的重要成矿构造。矿区辉绿岩属成矿前海西期基性岩墙,是大规模构造岩浆活动和成岩成矿作用的前峰。成矿作用主要发生在印支—燕山期(192—85Ma)。通过构造变形史与成矿期对比分析、构造热变质与退火作用、固态位移及铅锌在构造带中富集规律的研究表明:构造运动是成矿作用的主要动力。作者通过干体系高温高压成矿模拟实验,成功地获得人工糜棱岩和微粒方铅矿,而且铅锌在流变过程中趋于在糜棱岩带中富集,证实构造应力能够驱动成矿元素迁移富集,这对于成矿构造和矿床成因理论研究无疑具有很重要的贡献。     

Fluid inclusion study of Fankou Pb-Zn ore deposit,Fankou, Guangdong,China

The Fankou Pb-Zn ore deposit occurs in Devonian and Carboniferous carbonate rocks. This deposit was thought to be a hydrothermal ore deposit related to a granite, but the present research suggests it is a stratabound, stratiform mineral deposit. As a result of geological studies, primary sedimentary and later replacement features were found. Part of some ore bodies are concordant with the host rocks, but most are discordant lenses and veins in the carbonate rocks. Thus there are two types of ores, primary sedimentary and later replacement. The replacement type is very common. Isotopic studies indicate that most of the Pb and S are of sedimentary origin, but part of Pb is of radioactive origin, possibly introduced during later replacement. A regional geochemical survey indicates that the Pb and Zn contents of the Fankou region are respectively 1.5 and 3 times the primary sedimentary type. Gas-liquid fluid inclusions were found in the replacement type ore but not in the primary sedimentary type. The fluid which replaced the primary sedimentary rocks had temperatures of 100–200°C, with a salinity of 3–6 wt. % NaCl equiv. Under the action of such fluid the original sedimentary rocks were replaced to form the present ore deposit.     

粤北凡口黄铁铅锌矿床地球化学特征

粤北凡口黄铁铅锌矿床是我国著名的以铅锌为主的超大型矿床之一。本文对该矿床岩石和矿石的元素含量,硫,铅,碳,氢,氧同位素组成,以及包裹体化学成分特征进行了分析,并采用对应分析了研究了其元素组合特征。