Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2019 ( 35 )

2018 ( 357 )

2017 ( 322 )

2016 ( 303 )

Custom range...

Search Results: 1 - 10 of 25663 matches for " GU Ju-xing "
All listed articles are free for downloading (OA Articles)
Page 1 /25663
Display every page Item
Algorithms and Technologies for Multispectral,Hyperspectral, and Ultraspectral Imagery Ⅻ

GU Ju-xing,

红外 , 2008,
Abstract: 第一部分 一、探测与识别 1.高光谱图像的结构模型中正交子空间投影探测器与匹配滤光片的分析比较(P.Bajorski,美国罗彻斯特理工学院)
Application of artificial immunity system to geochemical anomaly

CHEN Ling,GUO Ke,TANG Ju-xing,YUAN Yong,WEI You-hua,

地球物理学进展 , 2009,
Abstract: 地球化学元素测量数据中含有噪声,影响了圈定地球化学异常的准确性.本文率先采用人工免疫系统(AIS)对地球化学测量数据进行降噪,在此基础上确定地球化学异常,并绘制了异常等值线图.通过对西藏恒星错测区1:50000水系沉积物测量数据的处理,验证了人工免疫系统在地球化学数据降噪中的实用性和可靠性.圈定的异常基本上消除了各类假异常,使主致矿异常更加突出,更加显著地反映矿化体的分布,尤其是得到的异常与恒星错王i£岩铜钼矿完全叠合,甚至映射了斑岩铜钼矿的边界和形态特征.
Genetic Mineralogy of Andalusite in Xiongcun Porphyry Copper-Gold Oredeposit, Tibet

HUANG Yong,DING Jun,TANG Ju-xing,ZHANG Li,LANG Xing-hai,

地球学报 , 2012,
Abstract: There are abundant andalusites in the Xiongcun porphyry copper-gold deposit.Three major assemblages are recognized,i.e.,quartz-K-feldspar-muscovite/sericite-andalusite assemblage,andalusite-quartz-sericite/muscovite assemblage,and quartz andalusite sulfide veins.The mineral association,texture and composition of andalusites indicate that the andalusites are of hydrothermal type.The quartz-K-feldspar-muscovite/sericite-andalusite assemblage in early K-silicate alteration zone was formed under the conditions of fairly high temperatures(above 550℃) and relatively low + K/+ H ratios.Early K-silicate alteration was replaced by later phyllic/sericitic alteration under lower P-T and higher + K/+ H conditions,and meteoric water probably entered the collapsed hydrothermal system during this period.Quartz-andalusite-sulfide veins with sericite alteration envelope occur rather rarely and are only observed within the phyllic alteration zone.This assemblage was formed under lower P-T and higher + K/+ H condition.Andalusite assemblages are similar to the El Salvador porphyry copper deposit in Chile.Volcanic tuff and porphyry stock had rich Al 2 O 3,which was favorable for the formation of andalusite.The andalusite within different assemblages helps reconstruct the P-T condition of the magmatic-hydrothermal process.
Mineral Chemical Characteristics of Biotites from Hornfels in the Jiama(Gyama) Polymetallic Copper Deposit of Tibet and Their Geological Significance

WANG Wei-ping,TANG Ju-xing,YING Li-juan,

地球学报 , 2012,
Abstract: 甲玛铜多金属矿床角岩中黑云母按其产状可区分为原生黑云母和热液黑云母,本文采用扫描电镜对两类产出状态的黑云母进行了观察,采用电子探针(EPMA)对这两类黑云母进行了微区原位成分分析,并根据电子探针数据计算了黑云母的矿物化学式。角岩中的原生黑云母和热液黑云母均属于镁质黑云母,二者都经受了热液流体的改造作用。从原生黑云母到热液黑云母Fe3+和Fe2+分异程度加大,Fe3+含量升高,Fe2+含量降低,指示了岩浆-热液流体逐渐向氧化态过渡。相比于原生黑云母,Cu元素更易于在热液黑云母中富集。角岩型矿石中的Cu含量与热液黑云母的Fe2+/(Fe2++Mg2+)比值呈正相关,与其Fe3+/Fe2+比值呈负相关,对于热液黑云母所在的角岩型岩矿石样品,其矿化强度或可以黑云母的Fe2+/(Fe2++Mg2+)比值来衡量;而Mo元素在两类黑云母中均广泛分布,不具有选择性赋存的特征。
A Study of Fluid Inclusions and Their Constraints on the Genesis of the Jiama(Gyama) Copper Polymetallic Deposit in Tibet

ZHOU Yun,TANG Ju-xing,QIN Zhi-peng,PENG Hui-juan,

地球学报 , 2012,
Abstract: The Jiama(Gyama) copper polymetallic deposit in Tibet,which is located in the eastern part of the Gangdise porphyry copper belt,is a superlarge porphyry-skarn deposit explored in recent years.A study of fluid inclusions in typical minerals of the mineralization stage from the Jiama(Gyama) deposit through heating/freezing system TEM and Laser Raman analysis shows that the ore-forming fluid was full of volatiles.Fluid homogenization of the critical phase originated from the exsolution of fluid supercritical fluid.The fluid inclusions of the main stage were assemblages of boiling inclusions.Fluorescent effect of organic inclusions are notable.Microthermometry shows that the homogenization temperature of fluid inclusions in quartz phenocrysts from the magmatic-hydrothermal stage was 250-540℃,the salinity concentration of fluid inclusions with halite minerals was 35-61(wt%)NaCl.eq,the salinity concentration of fluid inclusions of homogeneous phase was 3-29(wt%)NaCl.eq,the homogenization temperature in quartz vein from porphyry and hornfels after the magmatic stage was 210-410 ℃,the salinityconcentration was 33-41(wt%)NaCl.eq,the salinity concentration of fluid inclusions in unmixing association with them was 5-25(wt%)NaCl.eq.Homogenization temperature of skarn minerals was 130-360℃,the salinity concentration was 3-41(wt%)NaCl.eq.The homogenization temperatures and salinity decreased step by step from the magmatic-hydrothermal transition stage to the quartz-sulfide stage.There were abundant chalcopyrite daughter minerals in fluid inclusions from quartz phenocrysts,suggesting the enrichment of metallogenic elements at the magma crystallization and differentiation stage.The results of Laser Raman show that the gas compositions were mainly CO 2,CH 4 and N 2 in fluid inclusions from the early mineralization stage to the main mineralization stage.The gas compositions of fluid inclusions in minerals of various stages had close succession.Ore-forming fluids had high temperature and high salinity and were enriched in CO 2 and CH 4.The ore-forming fluids came from magma and were subsequently mixed with atmospheric water.When the magma-hydrothermal solution rose,high temperature ore-forming fluid experienced decompression and boiling due to the sudden release of pressure.Lots of CO 2 and CH 4 escaped,magmatic fluid was mixed with atmospheric water,causing the deposition of metallogenic elements.The deposit was genetically related to magmatic-hydrothermal mineralization.
Sulfur and Lead Isotope Characteristics of No. I Ore Body in the Xiongcun Porphyry Copper-Gold Ore Concentration Area of Tibet: Implications for the Source of Metals in the Ore Deposit

LANG Xing-hai,TANG Ju-xing,LI Zhi-jun,HUANG Yong,DING Feng,WANG Cheng-hui,ZHANG Li,ZHOU yun,

地球学报 , 2012,
Abstract: The Xiongcun porphyry copper-gold ore concentration area,one of the large-size metallogenic areas discovered along the Gangdise porphyry copper belt,occurs in an island arc environment associated with northward intra-oceanic subduction of Neo-Tethys oceanic crust.The ore-forming age of the Xiongcun porphyry copper-gold ore concentration area is middle Jurassic.It is located in the middle of the southern margin of the Gangdise orogenic belt,and its south margin is Shigatse forearc basin.The latest exploration data indicate that there are several potential mineralization-alteration areas and three large-size copper-gold ore bodies(No.Ⅰ,Ⅱ and Ⅲ) in the Xiongcun porphyry copper-gold ore concentration area.In this paper,Xiongcun No.Ⅰ ore body was chosen as the research object.According to sulfur and lead isotope composition of ore-baring porphyry,tuff and main sulfides of the ore,the authors have reached the following two conclusions:1) Sulfur isotopic compositions vary in a narrow range of δ 34 S values from 3.5‰ to +2.7‰(1.07‰ on average) and are close to zero,indicating a mantle sulfur signature.2) They have uniform Pb isotope compositions with low content of radiogenic Pb.The 206 Pb/204 Pb,207 Pb/204 Pb,and 208 Pb/204 Pb ratios vary in the ranges of 18.104-18.432,15.473-15.533 and 37.918-38.3072,respectively.They are located in the transition zone of mantle Pb and orogen Pb but are closer to the former,reflecting a mixing between the mantle material and minor crust material.Through a comparative study of sulfur and lead isotopes of porphyry copper deposits of the island arc environment(e.g.,Xiongcun No.I ore body) and those of the collisional orogenic environment in the Gangdise porphyry copper belt,the authors found that they have similar metal sources,but porphyry copper deposits of the island arc environment have experienced weak contamination of crust materials,whereas porphyry copper deposits of the collisional orogenic environment have experienced strong contamination of crust materials.
Minerogenetic Series of Ore Deposits in the East Part of the Gangdise Metallogenic Belt

TANG Ju-xing,Dorji,LIU Hong-fei,LANG Xing-hai,ZHANG Jin-shu,ZHENG Wen-bao,YING Li-juan,

地球学报 , 2012,
Abstract: The Gangdese metallogenic belt is one of the most important continual basements for mineral resources in China.The Lhasa Terrane(Gangdise magmatic arc,III43) is one of the most significant third-level(Ⅲ) metallogenic belts.There is a region from Lhaze County to Gongbo’gyamda County which is 600 km long and 90 km wide and has been studied in detail.There are five ore concentrated areas with the superlarge size Cu polymetallic deposits based on exploration and evaluation:Xiongcun Cu-Au ore concentrated area,Tinggong-Chongjiang Cu polymetallic ore concentrated area,Jiama-Qulong-Bangpu Cu polymetallic ore concentrated area,Mengyaa-Dongzhongla-Yaguila polymetallic ore concentrated area,and Chengba-Nuri W-Mo-Cu ore concentrated area.The research in recent years shows that there are five groups of minerogenetic series composed of Pb-Zn-Ag minerogenetic series group related to Hercynian volcanism and rift valley,Cu-Au-Fe-Pb-Zn-Ag-Mo minerogenetic series group related to Indo-Chinese and Yanshanian sedimentation-tectonic magmatism,Cu-Au-Fe-Pb-Zn-Ag-Mo-W-U-salt deposits minerogenetic series group related to Himalayan tectonic magmatism and sedimentation in the Gangdise metallogenic belt,which are composed of six minerogenetic series and ten subseries of ore deposits.The major subserieses include Cu-Au-Ag-Pb-Zn subseries related to Early Jurassic-Late Jurassic arc-type intermediate-felsic volcanic-supergene rock formation between 173 Ma and 160 Ma in the Yaba Formation in the periphery of Xiongcun and east of Lhasa with a promising potential;Pb-Zn-Ag-Mo-W-Fe subseries(Sharang style,Yaguila style and Dongzhongla style) related to Paleocene-Eocene intermediate-felsic volcanic rock and intermediate-supergene rock formation between 65 Ma and 38 Ma in the Linzhou Basin-Nanmulin Basin and Longger dislocated upwarping belt in the north with a promising potential;Cu-Mo-Pb-Zn-W-Au-Ag subseries(Qulong style,Jiama style,Chongjiang-Tinggong style,Zhunuo style and Bangpu style) related to Miocene intermediate-felsic supergene rock formation between 17 Ma and 13 Ma in the central zone of the east Gangdise metallogenic belt with a promising potential,especially the skarn-type Cu polymetallic deposits in the contact zone of ore-bearing porphyry.The distribution of metals from south to north are Cu-Au(porphyry type)→Mo-W(Cu)(porphyry-skarn type)→Cu-Mo-Pb-Zn(Au-Ag)(porphyry-skarn type)→Mo(Cu)(porphyry type)→Pb-Zn-Mo-W-Fe(porphyry-skarn type) →Pb-Zn(Ag)(hydrothermal vein type).The metallogenic ages from south to north are 173-154 Ma(Xiongcun)→40-20 Ma(Chongmuda etc.)→17-13 Ma(Qulong,Jiama etc.)→65-38 Ma(Sharang,Yaguila etc.).Biotite granite(granite porphyry,quartz porphyry) magmatic activities of Late Yanshanian and Late Himalayanian periods in Gangdise controls the distribution of skarn type Cu-Pb-Zn-Fe-Mo ore deposits.Most skarn type ore deposits occur in the intrusion or the surrounding area within 0-4 km from the intrusion with Cu,Mo,W mineralizations.There are Mo-W-Cu-Zn
Element Spatial Distribution of the Gaerqiong Copper-gold Deposit in Tibet and Its Geochemical Exploration Model

ZHANG Zhi,TANG Ju-xing,YANG Yi,LI Zhi-jun,YAO Xiao-feng,DENG Shi-lin,WANG Hong-xing,SONG Jun-long,

地球学报 , 2012,
Abstract: The Gaerqiong copper-gold deposit in the western section of the Bangong Co-Nujiang River metallogenic belt is the only deposit that has reached the level of detailed investigation,with its gold resource reaching the large size.According to the analytical results of elements in 30 drill holes,the authors made a systematic analysis of the plane distribution characteristics of ore-forming elements and found that the Gaerqiong deposit has obvious element zoning characteristics related to magmatic hydrothermal metallogenesis.The ore body from southeast to northwest and from the depth to the shallow part has the zoning feature of Mo→Cu(Au)→Cu+ Au+Ag→Au+Cu+Ag →Au+Ag.Through studying the mineralization in the lateral and vertical directions of the II—II’vertical profile and No.8 exploration line,the authors found that the ore body in the section and the plane has similar zoning characteristics.The geochemical exploration model indicates that from southeast to northwest there exists the anomaly zonality of Mo+Bi→Bi+Cu+Au+As→As+Au+Cu+Sb+Zn→Au(Cu)+ Zn→Au+Pb.Researches suggest that the hydrothermal center of the Gaerqiong deposit should be located in the 8—12 lines,the direction of fluid migration was from the southeast to the northwest,and the Gaerqiong copper-gold deposit is a typical porphyry-skarn deposit.
A Tentative Discussion on Ore Fabric and Genesis of the Zhaxikang Zn-polymetallic Deposit, Lhunze County, Tibet

WANG Yi-yun,TANG Ju-xing,ZHENG Wen-bao,LIN Bin,LENG Qiu-feng,CHEN Wei,DING Shuai,SONG Jun-long,XU Yun-feng,

地球学报 , 2012,
Abstract: Based on detailed drilling geological record and microscopic identification, the authors conducted a systematic study of the ore fabric characteristics of the Zhaxikang zinc-polymetallic deposit. In the mining area, the main ore structures are blocky, stockwork, disseminated, brecciated, geode and druse ones, formed by typical filling and metasomatism. The ore textures were formed mainly by crystallization and metasomatism, and subordinately by the influence of the pressure and the solid solution. Tectonism and mineralization of this mining area are of multi-stage and complex characteristics, and thus the textures formed by metasomatism are most common and of various types. Based on the research result of the ore fabric, combined with previous studies, the authors roughly divided the metallogenic periods into diagenesis, middle to low-temperature hydrothermal mineralization and supergene oxidation, with the low-temperature hydrothermal mineralization period being the most important metallogenetic period in this deposit. According to the features of mineral assemblages, six stages of mineralization were recognized, i.e., pyrite-quartz-calcite stage, sphalerite-pyrite-galena-arsenopyrite-iron rhodochrosite stage, galena-sphalerite- sulfosalt minerals stage, quartz-calcite-stibnite stage, quartz-calcite stage and oxidized minerals stage. It is held that the Zhaxikang zinc polymetallic deposit is a middle to low-temperature hydrothermal deposit, formed by filling and metasomatism and controlled by tectonic-magmatic activity.
A Study of Features, Modes of Occurrence and Enrichment Mechanism of Silver-rich Ore Bodies in the Jiama Copper-Polymetallic Deposit of Tibet

HU Zheng-hu,TANG Ju-xing,DING Feng,ZHENG Wen-bao,DENG Shi-lin,YANG Yi,ZHANG Zhi,WANG Yi-yun,LIN Bin,DING Shuai,

地球学报 , 2011,
Abstract: Located in Maizhokunggar County of Tibet, the Jiama copper-polymetallic ore deposit discovered in recent years has silver reserves of over 6000t, constituting a superlarge ore deposit in the eastern part of central Gangdise. According to modes of occurrence, the silver ore bodies in the Jiama copper-polymetallic ore deposit can be classified into skarn-type and marble-type. Mineragraphic studies and electron probe microanalysis reveal that silver exists in two types, i.e., visible silver and invisible silver, with visible silver being dominant. Invisible silver exists in copper minerals in the form of lattice silver besides existing in galena in the form of sub-microinclusions. Visible silver generally replaces sulfides such as bornite and chalcopyrite, or fills in the microsection of sulfides and lodestones in the form of four independent minerals, i.e., hessite, electrum, silver-lead ore and native silver. In the premetallogenic and high temperature phases, the metal ions in the Jiama ore deposit such as Cu, Mo, Au, Pb, Zn, Ag were transported in the form of complex compound. With the lowering of the temperature of metallogenic hydrothermal solution and the rising of the oxygen fugacity and pH value, the complex compound disintegrated due to the falling of its stability. S- and H- complex compounds constituted the main transporting form of Cu, Mo, Au, Pb, Zn, Ag. With the lowering of the temperature, the metal S- and H- complex compounds, such as Cu, Mo complex compounds, started to disintegrate and formed sulfides like molybdenum, chalcopyrite and bornite. And at this time, part of silver was distributed in these sulfides in the form of micro and sub-microinclusions and lattice silver. With the continuous lowering of the temperature, the precipitation of large quantities of Pb and Zn sulfides caused remarkable alteration of the components and properties of metallogenic hydrothermal solution, leading to thorough silver disintegration from S- and H- complex compounds and combination with Cu2+ to form large quantities of independent silver minerals, while the oversaturated silver in the solution was settled in the form of native silver.
Page 1 /25663
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.