Genetic Relationship between Natural Gas Dispersal Zone and Uranium Accumulation in the Northern Ordos Basin, China          下载免费PDF全文

GAN Huajun XIAO Xianming LU Yongchao JIN Yongbin TIAN Hui LIU Dehan 《《地质学报》英文版》2007,81(3):501-509

The Ordos Basin is well-known for the coexistence of oil, natural gas, coal and uranium. However, there has been little research to discuss the genetic relationship between them. In this paper, a case study of the Zaohuohao area in Dongsheng, Inner Mongolia, China, is conducted to investigate the genetic relationship between the natural gas and the uranium accumulation. Fluid inclusion data from the uranium-bearing sandstone samples indicate that the fluid inclusions formed in a gas-water transition zone. Using the homogeneous temperatures of aqueous inclusions coeval with hydrocarbon-bearing inclusions, combined with the buried history and paleo-temperature data, the gas-water transition zone reached the area at about 110 Ma. On the basis of this, the contents of Uranium （U） and Total Organic Carbon （TOC） of the samples were analyzed, and there was no obvious relation between them. With regard to the available data from both publications and this study, it is found that the U mineralization has a spatiotemporal accordance with the gas-water dispersal zone. Thus, it is believed that the natural gas in the gas-water zone is an effective reducer to the U-bearing ground water abundant in oxygen, which is the main factor to U accumulation. This result can be used as the reference to the U mines predicting and prospecting.  相似文献   

凤太泥盆纪拉分盆地中硅质铁白云岩—硅质岩特征及成岩成矿方式   总被引：16，自引：2，他引：14  

方维萱  刘方杰 《岩石学报》2000,16(4):700-710

从岩石学、矿物学、地球化学等叫结秦岭凤太地区泥盆纪硅质白云岩－硅质岩的地质地球化学特征。硅质岩类中,ＳｉＯ２〉８０％,（ＦｅＯ＋Ｆｅ２Ｏ３＋ＭｇＯ）〈１０％;硅质铁白云岩类中,ＳｉＯ２为３０％～５０％,（ＦｅＯ＋ＦｅＯ３＋ＭｇＯ）大于２０％,提出该类热水沉积岩热水同生沉积作用、热水温合同生沉积作用,热水同生沉积交代作用,热水爆炸－液压致裂作用及热水充填－交代作用形成。  相似文献   

扫描电镜—能谱在单个包裹体物质组成研究中的应用   总被引：5，自引：3，他引：2  

单强  牛贺才 《岩石学报》2000,16(4):711-714

利用扫描电镜－能谱对四川冕宁稀土矿床早期萤石的单个流体－熔融包裹体的成分进行了分析,发现包裹体内流体相离子以Ｎａ、Ｃａ、Ｂａ为主,阴离子以ＳＯ４、Ｆ、Ｃｌ米,有意义的是在包裹体中发现了Ｌａ、Ｃｅ、Ｎｄ等稀土元素,其中矿化元素素铈的含量最高,研究结果进一步证明四川冕宁稀土矿床是一个与盐熔体有关的热液矿床。  相似文献   

云南会泽铅锌矿床构造控矿及断裂构造岩稀土元素组成特征   总被引：22，自引：3，他引：19  

韩润生  刘丛强  黄智龙  李元  陈进 《矿物岩石》2000,20(4):11-18

云南会泽超大型铅锌矿床是川滇黔铅锌成矿区大型富铅锌矿床的典型代表,本文在研究矿区成矿地质背景,划分断裂构造岩类型及构造体系的基础上,提出ＮＥ构造带（华夏系）是会泽铅放离主要的成矿构造体系,概括了构造控矿特征,以控矿断裂带中的构造岩、矿及为主要研究对象,分析不同方向断裂的构造岩的稀土元素组成特征,按其特征和酝酿民分模式,将构造岩（矿石）划分为７种类型：Ｅｕ富集－开阔“Ｗ”型、Ｃｅ富集－Ｅｕ弱亏损－平缓型、平缓型、ＨＲＥＥ－ＬＲＥＥ较富集－开阔“Ｖ”字型、Ｅｕ强亏损－下斜型,Ｅｕ亏损－下斜型、Ｅｕ亏损－平缓型、其中ＮＥ向断裂带中的Ｃｅ富集－Ｅｕ弱亏损－平缓型与Ｅｕ富集－平缓型模式的构造岩是成矿预测的微观标志之一。  相似文献   

Relation of Isotope Geochemical Steep Zones with Geophysical Fields and Tectonics in the Junction Area of the Cathaysian, Yangtze and Indochina Plates     

ZHU Bingquan  Dong Yunpeng  CHANG Xiangyang  ZHANG ZhengweiGuangzhou Institute of Geochemistry  Chinese Academy of Sciences  Guangzhou  Guangdong 《《地质学报》英文版》2000,74(2):236-240

Through lead isotope geochemical mapping in the Yunnan-Guizhou area geochemical steep zones (GSZ) have been established, which clearly reveal the junction relationship of the Cathaysian, Yangtze and Indo-China plates. GSZ are closey related to gravity Mono gradient zones and lithospheric thickness. The GSZ between the Yangtze and Cathaysian plates is consistent with the Shizong-Mile tectonic belt, where island arc basalts are well developed. The Yangtze-Indo-China GSZ is parallel to the Jingdong-Mojiang volcanic belt in rift-island arc environments. The evidence of geology, geophysics and geochemistry all indicates that Cathaysia was subducted towards the Yangtze plate and that the Yangtze plate was underthrust beneath the Indo-China, which took place from the Early Carboniferous to the Early Triassic.  相似文献   

Tree-Ring Carbon Isotopic Constraints on Carbon-Water Exchanges between Atmosphere and Biosphere in Drought Regions in Northwestern China     

WANG Shilu  WAN Guojiang State Key Laboratory of Environmental Geochemistry  Institute of Geochemistry  CAS  Guiyang 《《地质学报》英文版》2000,74(2):301-305

The comparison between the carbon isotope and the index of ring width of a pine disc from the Tuomuer Peak region in Xinjiang shows that the effects of climate changes on the tree-ring growth and carbon iso-topic fractionation varies with time. The reason is probably relative to the characters of climate changes and adaptability of the tree-ring growth to climate changes. The relationships between the atmospheric CO2 level and the revised δ13Cair by the tree-ring carbon isotope indicate that the carbon cycle is not in a steady state, but under a stage-change condition in this area. It also can be concluded that the ratio of CO2 from the terrestrial eco-system has increased, and the flux of CO2 exchange between the atmosphere and the biosphere was gradually increasing over the past century. In addition, the results also confirm the validity and superiority of the carbon isotope to the research of the water-use efficiency.  相似文献   

广东河台金矿糜棱岩化过程构造-流体成矿研究   总被引：3，自引：0，他引：3       下载免费PDF全文

朱江建  陈广浩  龚贵伦  易金  蔡建新  龚朝阳  黄栋林  曾乔松  林舸 《地学前缘》2011,18(5):67-77

为了探讨糜棱岩化过程中的成矿作用,文章对广东河台金矿进行了构造流体过程的数值模拟研究。根据力的分解、显微构造及运动学涡度分析以及与模拟结果的对比,提出108°方向的双向挤压作用可能是本区糜棱岩化带形成时的力学环境。数值模拟结果结合前人研究成果表明,体积应变增量异常带有利于糜棱岩化和流体的聚集以及糜棱岩化过程中成矿作用的...  相似文献   

Re-Os and U-Pb Geochronology of the Erlihe Pb-Zn Deposit,Qinling Orogenic Belt,Central China,and Constraints on Its Deposit Genesis   总被引：4，自引：0，他引：4  

ZHANG Fan  LIU Shuwen  LI Qiugen  SUN Yali  WANG Zongqi  YAN Quanren  YAN Zhen Key Laboratory of Orogenic Belt  Crustal Evolution  Ministry of Education  Peking University  Beijing  China Guangzhou Institute of Geochemistry  Chinese Academy of Sciences  Guangzhou  China Institute of Mineral Resources  Chinese Academy of Geological Sciences  Beijing  China Institute of Geology  China 《《地质学报》英文版》2011,(3)

The Erlihe Pb-Zn deposit is an important mine of the Pb-Zn metallogenic zone in the South Qinling Orogen.It has been considered a sedimentary exhalative deposit in previous investigations because the ore body occurs concordantly at the transitional location of an upright fold.Re and Os isotopic analyses for paragenetic pyrites with sphalerite and galena from the ore body have been used to determine the timing of mineralization and to trace the source of metallogenic materials.The Re-Os isotopic data of f...  相似文献   

与花岗质岩浆系统有关的石英脉型钨矿和斑岩型铜矿成矿流体特征比较   总被引：9，自引：0，他引：9       下载免费PDF全文

王蝶  卢焕章  毕献武 《地学前缘》2011,18(5):121-131

文中对比了与S型花岗岩有关的石英脉型钨矿和与I型（及少数A型）花岗岩类有关的斑岩型铜矿床的成矿流体特征。它们的共同点在于成矿流体都由岩浆流体演化而来,在后期逐渐有大气降水的加入。差异性在于：（1）石英脉型钨矿成矿流体主要属于中—中高温、中—中低盐度的NaCl-H2O±CO2体系,而斑岩型铜矿属于中高-高温、高盐度的Na...  相似文献   

A Study on the Recovery and Classification of Meteorites from the Mt. Grove Region of Antarctica     

Jian-ZhongLiu  Yong-Liao Zou  Chun-Lai Li  Lin Xu  Zi-Yuan OuyangNational Astronomical Observatories  Chinese Academy of Sciences  Beijing  jzliu@bao. ac. cnInstitute of Geochemistry  Chinese Academy of Sciences  Guiyang 《中国天文和天体物理学报》2004,4(2)

The Antarctic Continent has become the largest natural preservatory of meteorites in the world because of its unique geographical position and climatic conditions. Mt. Grove is located in the inland area of the Antarctic Continent where the conditions are favorable for the preservation of meteorites. During China's 15th, 16th and 19th Antarctic Scientific Explorations a large number of meteorites were recovered in the Mt. Grove region. Especially during the 19th Exploration in 2002/03 a total of 4448 meteorites were recovered, which at one stroke put China among countries that have recovered most numbers of meteorites. Here, we report mainly the results of microscope and electron microprobe studies of 28 meteorites recovered during the 16th Exploration. The meteorites are chemically classified based on their mean Fa contents of olivine, mean Fs contents of low-Ca pyroxene and abundances of Fe-Ni metal. We also give a brief account of the meteorite recovery during the three Explorations and of some preli  相似文献