云南毛坪铅锌（银、锗）矿床流体包裹体特征及成矿流体来源   总被引：8，自引：1，他引：8  

韩润生  邹海俊胡彬胡熠昭  薛传东 《岩石学报》2007,23(9):2109-2118

云南毛坪铅锌(银、锗)矿床是川滇黔成矿域滇东北地区以碳酸盐岩为主岩的中-大型铅锌(银)矿床的典型代表。矿体空间分布严格受 NE 向层间断裂带和猫猫山倒转背斜的控制。主要脉石矿物(铁方解石、方解石及白云岩)中的流体包裹体发育,一般较小(3～15μm),主要为纯液相和液相包裹体,常沿矿物结晶面密集成群展布。成矿流体属 Na~ -K~ -Ca~(2 )-CI~- -F~- 型,流体包裹体均一温度为180～218(C,盐度为4.1 wt%～9.5 wt% NaCl,成矿压力为406×10~5～570×10~5Pa。在主要脉石矿物流体包裹体中,Na~ /K~ (1.54～4.53)与 Cl~-/F~-(0.72～156.33)较高,而重晶石流体包裹体中 Na~ /K~ (0.32～8.36)与 Cl~-/F~-(1.06～16.77)较低。成矿流体的(D 为-23‰～-64‰,方铅矿、闪锌矿和黄铁矿中流体包体(~(18)O_(v-SMOW)依次为0.3‰～6.2‰,-9.0‰～3.4‰和-6.8‰～-12.7‰。脉石矿物的(~(13)C_(v-PDB)为-1.1‰～-3.7‰。以上信息更好地揭示了成矿流体是变质水、岩浆水和建造水混合的产物,它们与沉积作用、昆阳群基底的变质作用及岩浆热液作用有关。该矿床本身可能是富含铅、锌、银等成矿流体对流循环沿构造"贯入"而成。该矿床不同于典型的 MVT 型铅锌矿床,是一碳酸盐岩为主岩的铅锌多金属硫化物矿床。  相似文献   

云南弥渡宝兴厂金矿床成矿模式     

王绍明  和正中 《云南地质》2007,26(3):289-297

宝兴厂矿区地质构造复杂,成矿条件有利。区内北东向响水断裂带是主要的控岩和控矿构造。三类金矿床分别在斑岩成矿期、热液成矿期和表生成矿期成生。文中建立相应的成矿模式。  相似文献   

Using Remote Sensing Data to Delineate the Lineaments for Hydrothermal Mineral Prediction in Heqing Area, Northwest Yunnan Province, China     

Mansour  S  Al-Mokredi  胡光道  Bassam  F  AI  Bassam 《中国地质大学学报(英文版)》2007,18(2):142-147

Lineament extraction and analysis is one of the routine work in mapping medium and large areas using remote sensing data, most of which are satellite images. Landsat Enhanced Thematic Mapper （ETM） of 945×1 232 pixels subscene acquired on 21 March 2000 covering the northwestern part of Yunnan Province has been digitally processed using ER Mapper software. This article aims to produce lineament density map that predicts favorable zones for hydrothermal mineral occurrences and quantify spatial associations between the known hydrothermal mineral deposits. In the process of lineament extraction a number of image processing techniques were applied. The extracted lineaments were imported into MapGIS software and a suitable grid of 100 m×100 m was chosen. The Kriging method was used to create the lineament density map of the area. The results show that remote sensing data could be useful to extract the lineaments in the area. These lineaments are closely correlated with the faults obtained through other geological investigation methods. On comparing with field data the lineament-density map identifies two important high prospective zones, where large-scale deposits are already existing. In addition the map highlights unrecognized target areas that require follow up investigation.  相似文献   

基于GIS的云南哀牢山成矿带南段金矿资源预测研究     

张峰  张桂林  徐涛  常春郊  马德锡  王斌 《矿产与地质》2007,21(1):86-89

在分析云南哀牢山成矿带南段地质特征以及总结该区金矿成矿规律和综合信息找矿模型的基础上,运用“找矿信息量”法对该区金矿资源进行综合成矿预测,共圈定4处找矿远景区,其中A类远景区1个,B类远景区3个。  相似文献   

云南中三叠统Macrocnemus(爬行纲: 原龙目)一新种及其古地理意义     

李淳  赵丽君  王立亭 《中国科学D辑》2007,37(10):1281-1286

记述了产自云南北部中三叠统法郎组竹杆坡段海相沉积中一件比较完整的陆生原龙类化石: Macrocnemus属一新种—Macrocnemus fuyuanensis sp. nov. 该标本以背椎数目, 股骨与胫骨、以及肱骨与桡骨之间相对长度的显著差异区别于欧洲的属型种Macrocnemus bassanii. 这是Macrocnemus化石在瑞士圣乔治山(Monte San Giorgio)地区以外的首次发现, 也是中国南方海相三叠系中第一件真正意义上的陆生爬行动物化石. Macrocnemus在法郎组竹杆坡段的出现, 不仅为颇具争议的竹杆坡段时代归属—中三叠世拉丁期(Ladinian)提供了新的证据, 同时明确显示该地区存在着一个未知的三叠纪陆生动物群, 这个陆地生态系统很可能起源于此前的安尼期(Anisian), 在拉丁期达到成熟阶段. 中生代早期特提斯洋北缘的岛屿和岛链, 是多种爬行动物特别是陆生爬行类东西迁移的重要通道.  相似文献   

云南水汞群体非均匀度异常与成组强震活动关系          下载免费PDF全文

陈燕  石绍先  刘强 《地震工程学报》2007,29(2):161-164

阐述了一种前兆群体异常信息提取新方法前兆群体非均匀度的数学原理,并以云南水汞群体异常信息为例进行了具体计算。结果表明该方法以群体异常分布特征的变化为异常标准(ID≥1),达到异常即自动识别报警。该方法能克服个人经验的局限,易为他人进行检验,可成为本地区成组强震预测对应概率较高的新指标。  相似文献   

云南地区房屋建筑的震害矩阵     

周光全  谭文红  施伟华  非明伦  解丽 《中国地震》2007,23(2):115-123

自1992年4月23日云南孟连西中缅交界6.7、6.9级地震始,地震部门对云南地区的破坏性地震进行了现场灾害调查和经济损失评估。1992~2003年,云南地区共发生50次破坏性地震,积累了丰富的震害资料。本文根据云南地区的主要建筑结构,统计分析了50次地震不同烈度区的破坏比、损失比和震害指数,给出了房屋建筑的震害矩阵。  相似文献   

云南澜沧-耿马Ms7.6地震的完全库仑破裂应力变化与后续地震的动态、静态应力触发   总被引：1，自引：0，他引：1  

吴小平  虎雄林  Michel Bouchon  黄雍  胡家富  解朝娣  王绍晋  胡毅力 《中国科学D辑》2007,37(6):746-752

计算和研究了1988年云南澜沧-耿马Ms7.6地震产生的完全库仑破裂应力变化的时空演化图像, 对继澜沧地震13 min后发生的耿马M7.2地震的应力触发问题进行了分析, 同时也对澜沧-耿马地震后24 d内发生的Ms5.0~6.9后续强余震的应力触发问题进行了探讨. 结果显示, 澜沧地震断层破裂产生的完全库仑破裂应力变化空间分布图像具有很强的非对称性, 正值的动态和静态库仑破裂应力变化区域均具有与强余震分布位置吻合较好的现象. 耿马Ms7.2地震受到了澜沧Ms7.6地震产生动态和静态库仑破裂应力的触发作用; 绝大多数后续强余震受到了动、静态库仑破裂应力的综合触发作用.  相似文献   

中国云南哀牢山含海蓝宝石伟晶岩的起源和成岩模拟实验研究   总被引：1，自引：0，他引：1  

李兆麟 李文季俊峰  王银喜石贵勇 《岩石学报》2007,23(1):39-52

The Ailaoshan aquamarine-bearing pegmatites are associated with Proterozoic metamorphic rocks in the southern portion of the Ailaoshan fault-folded complex.The gem-bearing pegmatite mineralization zones of the region occur in areas generally consistent with the regional tectonic trend.The pegmatites are found in metamorphic rocks,migmatites and in the inner/outer contact zones of gneissoid granites. The Rb-Sr isochron drawn for the pegmatites is 26～31 Ma,(i.e.in Himalayan).The homogenization temperatures of melt and liquid inclusions in minerals vary from 185 to 920℃,which are comparable to the inclusions observed in banded migmatites and ptygmatic quartz veins in the surrounding metamorphic rocks. The mineralization fluids of the pegmatite were rich in HCO_3 and CO_2,and their compositional assemblages are comparable to metamorphic fluids.Results of H,O,C,Si etc.isotopic analyses and REE,and Be analyses indicates that the sources of mineralization components that formed the pegmatites are closely associated with metamorphic fluids and the enclosing metamorphic rocks. A pegmatite structure simulation experiment was conducted at high temperature and pressure(840℃and 1,500×105Pa.),with various metamorphic rock samples in a water-rich and volatile-rich environment.When the liquidus was reached,the temperature was gradually decreased at the rate of 5～10℃/day over a time period of three months.SEM energy-dispersive spectrum analyses were performed on the experimental products.A series of pegmatoid textures were observed including zonal texture,megacryst texture,drusy cavities,crystal druses,and vesicular texture along with more than ten types of minerals including plagioclase,microcline,quartz and biotite.Different metamorphic rock melts generated different mineral assemblages.Experiment results revealed that the partial melting of metamorphic rocks could form melts similar to pegmatite magmas. Based upon the geological characteristics,geochemistry,and pegmatite texture simulation experimental results,it is concluded that the mineralization components of Ailaoshan aquamarine-bearing pegmatites came from metamorphic rocks.The petrogenetic model for the origin of pegmatites is related to ultrametamorphism and metamorphic anatexis.  相似文献   

云南澜沧老厂银铜铅锌矿床地质特征及成因研究   总被引：2，自引：0，他引：2  

李潇雨  王新利  李威  刘道荣  陈春发 《四川地质学报》2007,27(1):25-30

云南澜沧老厂银铜铅锌多金属矿床为我国西南三江地区著名的多金属矿床,对该矿床的成矿地质背景、矿床地质特征、围岩蚀变特征以及矿床分带特征进行了详细的论述,对众说纷纭的矿床成因进行了总结。  相似文献