The Characteristics of Lead Isotope Compositions and Fluid Inclusions of Yutang Pb-Zn Deposit,Western Hunan Province,China and Their Geological Significance

<正>1 Geology of Ore Field and Ore Deposit and Sampling The Yutang Pb–Zn deposit mainly dominated by lower Cambrian Qingxudong Formation limestone and located in southeastern margin of Yangtze block in regional structure,is part of the Huayuan Pb–Zn ore field situated in the western Hunan Province,China(WHPC).Orebodies are controlled by NE–trending     

NONMETALS DEPOSITS

20070359 Guo Xinhua (Qinghai Institute of Geological Survey, Xining 810012, China); Wang Chunnan Influence on the Ore of Development of the Potash Ore and the Laolu Disposing in the First Mine Area of Qarhan Saline Lake, Qinghai Province (Northwestern Geology, ISSN1009-6248, CN61-1149/P, 39(1), 2006, p.98-104, 2 illus., 15 refs.,with English abstract) Key words: potash deposits, magnesium deposits, environmental geology, Qinghai Province     

Chalcopyrite Intergrowths in sphalerite in the Meixian Lead—Zine Deposit,Fujian Province and their Metallogenic Significance

Ore textures and electron microprobe analyses show that in addition to highly scattered blebs in sphalerite grains,intergrown chalcopyrite also occurs as rods,myrmekites and lamellae aligned along cleavages and twin boundaries of the host sphalerite.The majority of the intergrowths could have been formed by replacement of sphalerite by chalcopyrite,albeit part of them may have resulted from exsolution,Not only copper,but also iron were introduced into the sphalerite by replacive fluids.While the front of the replacing fluid was moving forward through a sulphide orebody,Zn and Pb were dissolved and Cu was precipitated,resulting in zonal refining of the sulphide ores,The remobilized zinc and lead were precipitated at favourable sites with changed physico-chemical conditions .This is a possible mechanism for the formation of copper-poor zinc and lead ores above or lateral to the copper orebodies in some of the massive sulphide deposits reworked and overprinted by late-stage granites and their hydrothermal fluids.     

Chemical study of limestone and clay for cement manufacturing in Darukhula,Nizampur District,Nowshera, North West Frontier Province （N.W.F.P.）, Pakistan

Limestone and clay samples were collected from Darukhula and adjoining areas of the Nizampur District Nowshera, N.W.EE, Pakistan, and analyzed for different parameters in order to search for new reserves of suitable material for the manufacture of different types of cements in N.W.F.P. It was found that the area under study contains three types of limestones, including high grade limestone, Darukhula limestone and siliceous limestone, which contain 53%, 49.03% and 45.19% CaO, respectively, and three types of clay, including maroon color, yellow to yel- lowish-green color and green color clay containing 57.76%, 65.47% and 61.24% SiO2, respectively. Chemical analysis of the limestone and clay samples collected from the deposits in the area under study showed that all the elements found in these samples are within the range of permissible limits for the production of high-strength Portland cement, sulphate resisting cement and white cement. This paper covers the detailed version of the potential raw material deposits at Darukhula and adjoining areas of the Nizampur District.     

AbstractsofActaGeologicaSinica(ChineseEdition) Vol.78,No.4,2004

A New Study on the Stratotype and Biostratigraphy of the Yixian Stage in the Yixian-Beipiao Region, Liaoning --Establishment and Study of the Yixian StratotypeWANG Wuli, ZHANG Lijun, ZHENG Shaolin, ZHENG Yuejuan, ZHANG Hong, LI Zhitong and YANG Fanglin (Shenyang Institute of Geology and Mineral Resources, Shenyang, Liaoning 110032)     

Abstracts of Acta Geologica Sinica （Chinese Edition） Vol. 78, No. 4, 2004

A New Study on the Stratotype and Biostratigraphy of the Yixian Stage in the Yixian-Beipiao Region, Liaoning --Establishment and Study of the Yixian StratotypeWANG Wuli, ZHANG Lijun, ZHENG Shaolin, ZHENG Yuejuan, ZHANG Hong, LI Zhitong and YANG Fanglin (Shenyang Institute of Geology and Mineral Resources, Shenyang, Liaoning 110032)     

Abstracts of Acta Geologica Sinica （Chinese Edition） Vol. 80, No. 5, 2006

Space-Time Coordinate of the Evolution and Reformation and Mineralization Response in the Ordos Basin LIU Chiyang, ZHAO Hongge, GUI Xiaojun, YUE Leping, ZHAO Junfeng and WANG Jianqiang (State Key Laboratory of Continental Dynamics (Northwest University), Institute of Oil and Gas of Northwest University, Xi'an, Shannxi 710069) The Ordos Basin developed during the middle-late Triassic and early Cretaceous and has been reformed since the late Cretaceous. It mainly possesses the intra-craton characters and is a residual basin with multi-stage and different reformation. The Ordos Basin     

China’s Technologies for Exploration and Mining of Uranium Deposits Have Stepped into the World’s Top Team

On June 2011, the Beijing Research Institute of Uranium Geology, an Institute within the China National Nuclear Corporation （CNNC）, and the Department of Geology ＆ Mining CNNC carried out a project Scientific Drilling.for Deep Metallogenic Research in the Xiangshan Large Uranium Ore Field. A year later on June 21, the project, representing the first scientific drilling of China＇s uranium, was officially launched, and successfully completed on June 17, 2013. A 2818.88 m of drilling depth has broken the previous record 1200 m of exploration depth.     

Abstracts of Acta Geologica Sinica （Chinese Edition） Vol. 78, No. 6, 2004

Discovery of Parachuaria from the Chuanlinggou Formation of the Changcheng System in the Yanshan Region and Its SignificanceSUN Shufen, ZHU Shixing, HUANG Xueguang, CAO Fang and XIN Houtian(Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170)     

ROCKS & MINERALS DETERMINATION AND ANALYSIS

正20161631 Cao Lifeng(Henan Province Rock and Mineral Testing Center,Zhengzhou450012,China);Wang Minjie Determination of Cu,Pb,Zn,W and Mo in Deep-Penetrating Geochemical Samples of the Luanchuan Ore Concentrated District by ICP-MS with Extraction Elements of Mobile Forms(Rock and Mineral Analysis,ISSN0254-5357,CN11-2131/     

Study on the Physical and Chemical Conditions of Ore Formation of Hetai Ductile Shear Zone—Hosted Gold Deposit and Discovery of Melt Inclusions

The Hetai ductile shear zone-hosted gold deposit occurs in the deep-seated fault mylonite zone of the Sinian-Silurian metamorphic rock series. In this study there have been discovered melt inclusions, fluid-melt inclusions and organic inclusions in ore-bearing quartz veins of the ore deposit and mylonite for the first time. The homogenization temperatures of the various types of inclusions are 160℃, 180 - 350℃, 530℃ and 870℃ for organic inclusions, liquid inclusions, two-phase immiscible liquid inclusions and melt inclusions, respectively. Ore fluid is categorized as the neutral to basic K+ -Ca2+ -Mg2+ -Na+ - SO2- 4-HCO3-Cl- system. The contents of trace gases follow a descending order of H2O＞CO2＞CH4＞(or ＜ ) H2＞CO＞C2H2＞C2I-I6＞O2＞N2.The concentrations of K , Ca2 + ,SO2-4,HCO3-,Cl- H2O and C2H2 in fluid inclusions are related to the contents of gold and the Au/Ag ratios in ores from different levels of the gold deposit. This is significant for deep ore prospecting in the region. Daughter minerals in melt inclusions were analyzed using SEM. Quartz, orthoclase, wollastonite and other silicate minerals were identified. They were formed in different mineral assemblages.This analysis further proves the existence of melt inclusions in ore veins. Sedimentary metamorphic rocks could form silicate melts during metamorphic anatexis and dynamic metamorphism, which possess melt-solution characteristics. Ore formation is related to the multi-stage forming process of silicate melt and fluid.     

Acta Petrologica Mineralogica et Analytica 1980 (Vol. 1) Contents

No.1Petrographic Studie。of The Volcanic Complex in The Xiang。han Caldera …………·……………………………………………………………”Pang Xiheng,ttou Wenyao,Wan Guoliang(10)charactcristic.of The Skarn Zoning of The Makeng and Yeng。han Iron Ore Deposits in Fujian and Thier Relationship with’the Mineralization Zoning………………Zhao Yining,Tan Huifing,Sun Jinghua(22)Mossbauer Study of Bafertisite……·………………··Wu Gongbao,Wang Toutong,Zhang Shuiun,Ding Haohua(29)The Disc…     

Abstracts of Acta Geologica Sinica (Chinese Edition) Vol. 79, No. 6,2005

Morphologic Differentiation and Taxonomy of Anisograptus from the Lower OrdovicianLI Ming, FENG Hongzhen and LIU Bo(Department of Earth Sciences, Nanjing University, Nanjing, Jiangsu 210093; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing, Jiangsu 210008)Specimens from the Hule area of Ningguo County, Anhui Province and data of all 25 known species and subspecies shows that Anisograptus has apparent morphologic differentiation in the length of primary stripes, the…     

Abstracts of Acta Geologica Sinica (Chinese Edition)Vol. 76, No. 2,2002

Reef-building Mechanism in the Early-Middle Permian of the East Kunlun Mountains TIAN Shugang(Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037) and FAN Jiasong(Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029) Reef-building was controlled by the community succession, sea-level elevation and basement changes caused by tectonics. Six kinds of reef-bnilding communities have been sorted out, which possess different compositions and occupy respective ecological sets. Types and thriving of communities were distinctive and replaced one after another in the four stages of reef development. Sedimentary cyclothems are clearly discernible in the reef-facies strata, which could be divided into     

EXPLORATION ENGINEERING

正20141251Ban Junsheng(Central Laboratory,Second Geological Team,Henan Provincial Non-Ferrous Metals Geological and Mineral Resources Bureau,Pingdingshan 467021,China);Ren Jinxin Determination of the Magnetic Material Composition in Magnetite Ore     

Abstracts of Acta Geologica Sinica (ChineseEdition) Vol.78,No.6,2004

Discovery of Parachuaria from the Chuanlinggou Formation of the Changcheng System in the Yanshan Region and Its SignificanceSUN Shufen, ZHU Shixing, HUANG Xueguang, CAO Fang and XIN Houtian(Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170)     

Geology and D-O-C Isotope Systematics of the Tieluping Silver Deposit,Henan, China: Implications for Ore Genesis

The Tieluping silver deposit, which is sited along NE-trending faults within the high-grade metamorphic basement of the Xiong‘er terrane, is part of an important Mesozoic orogenic-type Ag-Pb and Au belt recently discovered. Ore formation includes three stages: Early (E), Middle (M) and Late (L), which include quartz-pyrite (E),polymetallic sulfides (M) and carbonates (L), respectively. The E-stage fluids are characterized by δD=-90%c,δ^13CCO2=2.0‰ and δ^18O=9‰ at 373℃, and are deeply sourced; the L-stage fluids, with δD=-70‰, δ^13C CO2=-1.3%c and δ^18O=-2‰, are shallow-sourced meteoric water; whereas the M-stage fluids, with δD=-109‰, δ^13C CO2=0.1%c and δ^18O2‰, are a mix of deep-sourced and shallow-sourced fluids. Comparisons of the D-O-C isotopic systematics of the Estage ore-forming fluids with the fluids derived from Mesozoic granites, Archean-Paleoproterozoic metamorphic basement and Paleo-Mesoproterozoic Xiong‘er Group, show that these units cannot generate fluids with the measured isotopic composition (high δ^180 and δ^13C ratios and low δD ratios) characteristic of the ore-forming fluids. This suggests that the E-stage ore-forming fluids originated from metamorphic devolatilization of a carbonate-shale-chert lithological association, locally rich in organic matter, which could correspond to the Meso-Neoproterozoic Guandaokou and Luanchuan Groups, rather than to geologic units in the Xiong‘er terrane, the lower crust and the mantle. This supports the view that the rocks of the Guandaokou and Luanchuan Groups south of the Machaoying fault might be the favorable sources. A tectonic model that combines collisional orogeny, metallogeny and hydrothermal fluid flow is proposed to explain the formation of the Tieluping silver deposit. During the Mesozoic collision between the South and North China paleocontinents, a crustal slab containing a lithological association consisting of carbonate-shale-chert, locally rich in organic matter (carbonaceous shale) was thrust northwards beneath the Xiong‘er terrane along the Machaoying fault.Metamorphic devolatilization of this underthrust slab provided the ore-forming fluids to develop the Au-Ag-(Pb-Zn) ore belt, which includes the Tieluping silver deposit.     

Abstracts of Acta Geologica Sinica (Chinese Edition)Vol.75, No.1, 2001

Over the area between Beipiao City and Yixian County, Hebei Province, there outcrop trachyte-trachyandesite volcanic rocks of the Upper Jurassic Zhangjiakou Formation and sedimentary series of the Dabeigou Formation. The ~(40)Ar-~(39)Ar datings of the volcanic rocks give an age of 143. 9 Ma. The most recently defined basalt member in the lower part of the Cretaceous Yixian Formation was dated at 137-129 Ma, while the andesite member in the upper part at 126-120 Ma. It is ascertained that     

Abstracts of Acta Geologica Sinica (Chinese Edition) Vol. 77, No. 1,2003

Distribution of Mid-Cretaceous Orbitolinids in Tibet and ItsPaleobiogeographic ImplicationsWAN Xiaoqiao, WU Yianhua and LI Guobiao (China Universityof Geosciences, Beijing 100083, China)Orbitolinids is a kind of large foraminifera. It occurredfrequently during the late Barremian to Cenomanian of theCretaceous and is distributed worldwide, especially in theshallow marine belts surrounding the Tethys Ocean. Itsdistribution in Tibet is limited to the Lhasa Block and some partsof the Qiangtang Basin. On both sides of this area, the     

Abstracts of Acta Geologica Sinica （Chinese Edition） Vol. 80, No. 10, 2006

Petroliferous Provinces in China and the World: A Compaison from Tectonic Point of View REN Jishun, DENG Ping, XIAO Liwei, NIU Baogui and WANG Jun (Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037) The comparison of petroliferous provinces of China with those of the world indicates marked differences beween them. The world’s oil and gas regions, which, in general, experienced monocyclic evolution in the geological history, are dominated by marine, e…