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^(40)Ar/^(39)Ar Dating of the Shaxi Porphyry Cu-Au Deposit in the Southern Tan-Lu Fault Zone, Anhui Province 被引量:6
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作者 YANG Xiaoyong ZHENG Yongfei +2 位作者 XIAO Yilin DU Jianguo SUN Weidong 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2007年第3期477-487,共11页
Four samples of plagioclase and biotite from the Shaxi porphyry in the lower part of the Yangtze metallogenic belt were analyzed for age determination with the ^40 Ar/^39Ar method. The results yield reproducible ages ... Four samples of plagioclase and biotite from the Shaxi porphyry in the lower part of the Yangtze metallogenic belt were analyzed for age determination with the ^40 Ar/^39Ar method. The results yield reproducible ages of 126 Ma to 135 Ma with a high level of confidence according to the agreement between isochron and plateau ages. The four Ar-Ar ages are relatively consistent within the analytical error. These ages are also consistent with, but more precise than, previous K-Ar and Rb-Sr ages and thus provide better constraints on the time of porphyry formation and associated Cu-Au mineralization along the middle to lower part of the Yangtze metallogenic belt. The ages of 126 to 135 Ma are interpreted to represent the intrusive time of the Shaxi porphyry, so that the Cu-Au mineralization should have occurred later due to the post-magmatic hydrothermal event. 展开更多
关键词 Shaxi porphyry-type cu-au deposit ^40 Ar/^39 Ar dating Yangtze metallogenic belt Tancheng -Lujiang fault belt East China
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Geological, Alteration and Mineralization Characteristics of Ali Javad Porphyry Cu-Au Deposit, Arasbaran Zone, NW Iran
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作者 Behzad Hajalilou Mehraj Aghazadeh 《Open Journal of Geology》 2016年第8期859-874,共17页
Ali Javad porphyry Cu-Au deposit is located 20 Km north of Ahar city in Arasbaran metallogenic zone which is considered as a part of Alp-Himalayan mineralization belt. Magmatism in this area began in Late Cretaceous, ... Ali Javad porphyry Cu-Au deposit is located 20 Km north of Ahar city in Arasbaran metallogenic zone which is considered as a part of Alp-Himalayan mineralization belt. Magmatism in this area began in Late Cretaceous, followed by extensive magmatism in Cenozoic and Quaternary periods. Porphyry type mineralization developed in Ali Javad quartz monzonitic porphyry stock and Eocene pyroclastic and volcanic country rocks. Ali Javad porphyry intrusion has shoshonitic nature and shows characteristics of volcanic arc granitoids that it is have been emplaced in a post-collision tectonic setting. Alteration zones at the deposit demonstrated zoning which is comparable with Lowel-Guilbert model proposed for quartz-monzonite type porphyry copper deposits. Phyllic, argillic, silicic and propylitic alteration zones were observed at the surface while potassic alteration zone could be observed at depth in drill core samples. Mineralization was recognized both as supergene and hypogene, the latter was as veins, veinlets and disseminations. Dominant hypogene minerals were chalcopyrite, bornite, molybdenite, pyrite and magnetite while chalcocite, covellite and limonite were dominant supergene minerals. Four mineralization zones were observed in the deposit as leached, transitional, supergene and hypogene zones. Average grades were 0.75% for copper and 1.86 ppm for gold with 81.5 Mt proved reserve for copper and 37.8 Mt for gold. 展开更多
关键词 GEOLOGY ALTERATION MINERALIZATION Ali Javad Porphyry cu-au deposit Iran
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Study on Shaxi porphyry copper-gold deposit in Anhui:gold mineralization and occurrence determination by PIXE
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作者 杨晓勇 李勋贵 +1 位作者 黄德志 王奎仁 《Journal of Central South University of Technology》 2003年第4期352-358,共7页
Shaxi porphyry Cu-Au deposit was one of the important discoveries of the exploration in the middle-lower reaches of Yangtze River in China in 1970s. Gold occurrence in the Shaxi porphyry copper-gold deposit (central (... Shaxi porphyry Cu-Au deposit was one of the important discoveries of the exploration in the middle-lower reaches of Yangtze River in China in 1970s. Gold occurrence in the Shaxi porphyry copper-gold deposit (central (Anhui) province, eastern China) was investigated by means of microscope analyses, EPMA and PIXE. Combined with geological and mineralogical methods, the characteristics of occurrence of gold in the large scale sulfide mineralization in this region were fully investigated. The results show that gold distributes in both chalcopyrite and pyrite as submicroscopic inclusions (less than 1 μm) . Au is positively correlated with As, Fe, S, Cu, Zn and Ti. The condition of gold transformation in thermal fluid system controlling deposition of Au in the region is probably the oxidation potential of the red sedimentary rocks of shale and fine grain sandstone which may be crucial as a geochemical barrier to the reducing fluid. This study lays foundation for the further research and exploration of the porphyry copper-gold deposit both theoretically and practically in the lower reaches of Yangtze region. 展开更多
关键词 EPMA PIXE gold OCCURRENCE Shaxi PORPHYRY cu-au deposit ANHUI
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西藏多龙矿集区色那铜金矿地质特征、侵入岩地球化学特征及其地质意义 被引量:6
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作者 高轲 唐菊兴 +5 位作者 方向 张志 王勤 杨欢欢 王艺云 冯军 《矿物学报》 CAS CSCD 北大核心 2016年第2期199-207,共9页
色那铜金矿是多龙矿集区内新近发现的又一个具有巨大找矿潜力的斑岩型矿床。在详细野外地质调查的基础上对区内与成矿具有密切关系的石英闪长玢岩体进行了岩石地球化学特征研究。结果表明区内斑岩为准铝质—过铝质岩类,高钾钙碱性—钙... 色那铜金矿是多龙矿集区内新近发现的又一个具有巨大找矿潜力的斑岩型矿床。在详细野外地质调查的基础上对区内与成矿具有密切关系的石英闪长玢岩体进行了岩石地球化学特征研究。结果表明区内斑岩为准铝质—过铝质岩类,高钾钙碱性—钙碱性系列,属于I型花岗岩类。稀土元素配分曲线显示为以富集轻稀土为特征的右倾型,且轻稀土分馏明显,而重稀土分馏不显著;δEu=0.89~1.05,显示无明显Eu异常,表明斜长石的结晶分异作用不明显;δCe介于0.84~1.51之间,平均值为1.08,无明显Ce异常。微量元素总体富集大离子亲石元素Rb、K、La、Sr、Sm,相对亏损高场强元素Nb、Ta、Zr、Hf、Ti等,显示出岛弧岩浆特征,微量元素构造环境判别显示其形成于岛弧环境。结合区域构造背景演化,表明色那铜金矿床可能形成于班公湖-怒江特提斯洋北向俯冲阶段。 展开更多
关键词 地球化学 石英闪长玢岩 色那铜金矿 西藏
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色那金矿石英二长闪长岩锆石U-Pb年龄与地球化学特征及其对成矿背景的约束 被引量:18
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作者 段志明 李光明 +2 位作者 张晖 李应栩 段瑶瑶 《吉林大学学报(地球科学版)》 EI CAS CSCD 北大核心 2013年第6期1864-1877,共14页
色那金矿是西藏多龙矿集区内发现的一个浅成低温热液型金矿点,其成岩成矿时代一直缺乏精确的年代学约束。对该金矿石英二长闪长岩进行了LA—ICP—MS锆石U—Pb定年、主-微量元素分析和Sr—Nd同位素组成研究,首次获得了多龙矿集区色那... 色那金矿是西藏多龙矿集区内发现的一个浅成低温热液型金矿点,其成岩成矿时代一直缺乏精确的年代学约束。对该金矿石英二长闪长岩进行了LA—ICP—MS锆石U—Pb定年、主-微量元素分析和Sr—Nd同位素组成研究,首次获得了多龙矿集区色那金矿赋矿岩石的成岩时代。石英二长闪长岩LA—ICP—MS锆石U—Pb年龄为(122.0±1.8)Ma,代表岩浆的结晶年龄。石英二长闪长岩具低硅(57.26%~58.88%)、高铝(16.58%~17.50%)、富镁(2.65%~2.98%)特征,铝饱和指数(A/CNK)为0.93~1.09,富集轻稀土元素(LREE/HREE-6.28~7.25),8Eu为0.85~1.05,富集大离子亲石元素Rb、U、La、Sr、Sm,亏损高场强元素Nb、Ta、Zr、Hf等,相对于原始地幔具高Sr[(^87Sr/^86Sr)i=0.705023~0.705453]、低Nd[eNd(t)=-0.18~2.43]的同位素组成和古老的Nd同位素二阶段模式年龄(TDM2=0.78~1.03Ga),属于偏铝质-过铝质岛弧型花岗岩。多龙矿集区色那金矿早白垩世末岩浆活动与成矿作用很可能是班公湖一怒江洋向北俯冲诱发洋壳物质部分熔融,并有少量俯冲沉积物(3.1%~5.1%)和幔源岩浆参与部分熔融混合形成母岩浆,再经一定程度的分异结晶作用和接触交代作用而形成。 展开更多
关键词 锆石U-PB定年 岛弧型花岗岩 成矿背景 色那金矿 班公湖-怒江缝合带 金矿
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西藏色那铜金矿床侵入岩元素地球化学特征研究 被引量:1
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作者 何阳阳 温春齐 刘显凡 《新疆大学学报(自然科学版)》 CAS 2019年第1期98-105,共8页
多龙矿集区是中国第一个世界级超级铜矿矿集区,探获的铜金属量已超过2 000万吨;色那铜金矿床是继多不杂、波龙、铁格隆南、拿若等超大型矿床后,多龙矿集区内发现的又一具有大型前景的矿床.探讨色那铜金矿床侵入岩的元素地球化学特征,分... 多龙矿集区是中国第一个世界级超级铜矿矿集区,探获的铜金属量已超过2 000万吨;色那铜金矿床是继多不杂、波龙、铁格隆南、拿若等超大型矿床后,多龙矿集区内发现的又一具有大型前景的矿床.探讨色那铜金矿床侵入岩的元素地球化学特征,分析成岩成矿构造背景,有助于其矿床成因及成矿机制的认识.选择矿区内相关侵入岩样品,测试其化学成分.研究表明,色那铜金矿区分布着两套侵入岩,一套为中钾强钙碱性花岗闪长岩类,相对富集Cs、Ba、La、Ce、Sr、Zr等元素,相对亏损Rb、Ta、Nb、Hf等元素;另一套为高钾中钙碱性闪长岩类,相对富集Cs、Rb、Th、U、La、Sr、Sm等元素,相对亏损Ba、Ta、Nb、Hf等元素.由闪长岩类→花岗闪长岩类,样品的δCe表现为由弱负异常→弱正异常,这是因为地幔底辟作用引发地壳部分重熔形成长英质岩浆的过程中,逐步消弱了结晶分异导致的负铈异常,并随其比例和强度增大而形成正铈异常.色那铜金矿区侵入岩在成岩成矿过程中,具熔浆性质的幔源含矿流体与地壳深部重熔岩浆是两个性质不同且相互独立的物质体系;二者混合后共同运移并随岩浆结晶成岩过程和环境物化条件的变化而参与成矿. 展开更多
关键词 闪长岩 花岗闪长岩 色那铜金矿床 西藏 地球化学特征
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Geochemistry and genesis of the Nadun Nb-enriched arc basalt in the Duolong mineral district,western Tibet:Indication of ridge subduction 被引量:2
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作者 Tian-Yu Zhang Jianghong Deng +3 位作者 Ming Wang Cai Li Lipeng Zhang Weidong Sun 《Geoscience Frontiers》 SCIE CAS CSCD 2022年第1期230-243,共14页
The Duolong mineral district in western Tibet is one of the largest porphyry Cu–Au deposit fields with significant metallogenic potential in China.Its tectonic environment relevant to Early Cretaceous Cu–Au minerali... The Duolong mineral district in western Tibet is one of the largest porphyry Cu–Au deposit fields with significant metallogenic potential in China.Its tectonic environment relevant to Early Cretaceous Cu–Au mineralization remains controversial.Here we report new whole-rock major and trace element,and Sr-Nd-Hf-Pb isotopic data for the newly discovered basalt in the Nadun area,Duolong mineral district,to decipher their genesis and further constrain the tectonic environment.A contemporaneous rhyolite sample interbedded with the basalt in the lower part of the volcanic section in the Nadun area yields an LA-ICP-MS zircon U–Pb age of 122.5±1.2 Ma.The basalt samples exhibit high-K calc-alkaline/shoshonite properties and are enriched in high field strength elements,e.g.,high Ti O_(2)(1.43–1.79 wt.%)and Nb(14.6–19.5 ppm)contents,with high Nb/La ratios(0.4–0.6),which are compositionally comparable to those of Nb-enriched arc basalts(NEABs).The(^(87) Sr/^(86) Sr)iratios of 0.7052 to 0.7056,negative eNd(t)(-0.7 to-0.2)and eHf(t)values(+6.0 to+6.5),and high(^(206) Pb/^(204)Pb)i,(^(207) Pb/^(204)Pb)i,(^(208) Pb/^(204)Pb)iand ratios(18.522 to 18.561,15.641 to 15.645 and 38.679 to 38.730,respectively)suggest that the Nadun NEABs are more enriched than those of the island arc basalts(IABs)in the area.The slightly enriched radiogenic isotopes for the Nadun NEABs indicate that the subducting sediments play an important role in the source.Furthermore,their high Nb,Ti,and Cu contents indicate that the source mantle wedge was metasomatized by slab melts.The Nadun NEAB and other coeval magmatic rocks in the Duolong mineral district,including adakite,OIB-like basalt,MORB-type basalt,A-type rhyolite,and common IAB,are typical rock assemblages of ridge subduction.We infer that the Duolong mineral district were formed by ridge subduction in the Early Cretaceous. 展开更多
关键词 TIBET Duolong porphyry cu-au deposit Nb-enriched arc basalt Tethys ocean Ridge subduction
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Alunite spectral features and mineral chemistry of the ZijinshanDafanshan lithocap in SE China:Implications for mineral exploration
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作者 Yandong Sun Guiqing Xie Jing Chen 《Acta Geochimica》 EI CAS CSCD 2023年第4期585-602,共18页
Lithocaps are composed of silicic and advanced argillic altered rocks,and represent an important target for porphyry-epithermal Cu-Au exploration.Previous studies showed that integrating alunite spectral and compositi... Lithocaps are composed of silicic and advanced argillic altered rocks,and represent an important target for porphyry-epithermal Cu-Au exploration.Previous studies showed that integrating alunite spectral and composition with lithocap whole-rock geochemistry can effectively aid exploration for concealed Cu-Au mineralization.The Zijinshan Cu-Au and Dafanshan alunite deposits are located in the Coastal Volcanic Belt in SE China,where alunite is an indicator of hypogene mineralization and alteration.Detailed mineralogical studies of alunite from these two deposits were performed with short-wavelength infrared spectroscopy(SWIR),whole-rock geochemistry and laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS).For Zijinshan,wavelength variation of the SWIR alunite absorption peak at 1480 nm is proportional to the whole-rock Na/(Na+K)molar ratio of alunitebearing samples.Different percentage of alunite and mineral assemblages in the lithocap samples would both affect the wavelength of the SWIR alunite absorption peak at1480 nm.We suggest that the alunite Ba-Bi contents and the whole-rock Nb/La value(of alunite-bearing rocks)are reliable vectoring tools for detecting magmatic-hydrothermal mineralization center in the district.Comparing the alunite SWIR spectral and mineral geochemical features and whole-rock geochemistry of alunite-bearing rocks between the Zijinshan and Dafanshan deposits,Au–Ag mineralization may be concealed at depth in northwestern Dafanshan. 展开更多
关键词 Lithocap SWIR Geochemical indicators Zijinshan cu-au epithermal deposit Dafanshan alunite deposit
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西藏改则县色那铜金矿床地质特征及成因
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作者 吴丰 孙振明 +3 位作者 王思成 杨煊 杨枢卿 吕星池 《吉林地质》 2022年第4期7-13,共7页
色那铜金矿床是多龙矿集区重要组成矿床之一。本文在系统分析其矿床地质特征、矿体特征、矿石特征及围岩蚀变等特征,通过野外调研及室内岩相学与矿相学分析,将色那铜金矿的形成划分为石英-多金属硫化物阶段、碳酸盐-黄铁矿阶段和表生成... 色那铜金矿床是多龙矿集区重要组成矿床之一。本文在系统分析其矿床地质特征、矿体特征、矿石特征及围岩蚀变等特征,通过野外调研及室内岩相学与矿相学分析,将色那铜金矿的形成划分为石英-多金属硫化物阶段、碳酸盐-黄铁矿阶段和表生成矿阶段三个成矿阶段。同时分析了色那铜金矿床的围岩蚀变特征,认为色那铜金矿床不具备典型斑岩型矿床的以岩体为中心的中心式面型蚀变特征,通过与区内典型斑岩型铜金矿床和斑岩-高硫化浅成低温热液型矿床地质特征进行对比,推测色那铜金矿床的矿床成因类型为斑岩-高硫化浅成低温热液型矿床。根据矿体产出地质条件,认为具有绢云母化和青磐岩化的早白垩世花岗闪长斑岩与色哇组长石石英砂岩是重要找矿标志。 展开更多
关键词 西藏 改则县 色那铜金矿 地质特征 矿床成因
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Geochronology and Geochemistry of the Granites from the Longtoushan Hydrothermal Gold Deposit in the Dayaoshan Area,Guangxi:Implication for Petrogenesis and Mineralization 被引量:5
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作者 Lihua Qian Jianqing Lai +3 位作者 Lifang Hu Rong Cao Shilong Tao Bei You 《Journal of Earth Science》 SCIE CAS CSCD 2019年第2期309-322,共14页
The gold mineralization in the Longtoushan hydrothermal gold deposit is concentrated within the contact zone of the granitic complex. Whole rock geochemistry and in-situ U-Pb and Hf isotopic data were used to constrai... The gold mineralization in the Longtoushan hydrothermal gold deposit is concentrated within the contact zone of the granitic complex. Whole rock geochemistry and in-situ U-Pb and Hf isotopic data were used to constrain the genesis and age of the granites and related Cu-Au mineralization in the Longtoushan Deposit. The granites mainly consist of the granite porphyry, rhyolite porphyry, porphyritic granite and quartz porphyry. LA-ICP-MS U-Pb dating of zircons from the granite porphyry, rhyolite porphyry and quartz porphyry indicates that they intruded from ca. 94 to 97 Ma. These intrusions exhibit similar trace element characteristics, i.e., right-dipping REE patterns, depletion of Ba, Sr, P and Ti, and enrichment of Th, U, Nd, Zr and Hf. The εHf(t) values of zircons from the granite porphyry, rhyolite porphyry and quartz porphyry range from-26.81 to-8.19,-8.12 to-5.33, and-8.99 to-5.83, respectively, suggesting that they were mainly derived from the partial melting of the Proterozoic crust. The Cu-Au mineralization is mainly related to the rhyolite porphyry and porphyritic granite, respectively. The Longtoushan granites were most likely formed in a post-collisional extensional environment, and the deposit is a part of the Late Yanshanian magmatism related mineralization in the Dayaoshan area and its adjacent areas. 展开更多
关键词 Longtoushan gold deposit RHYOLITE PORPHYRY zircon U-Pb dating Hf isotopes PETROGENESIS cu-au mineralization
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Ridge subduction and porphyry copper-gold mineralization:An overview 被引量:104
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作者 SUN WeiDong LING MingXing +3 位作者 YANG XiaoYong FAN WeiMing DING Xing LIANG HuaYing 《Science China Earth Sciences》 SCIE EI CAS 2010年第4期475-484,共10页
Many large porphyry Cu-Au deposits are connected to adakitic rocks known to be closely associated with ridge subduction. For example, there are several subducting ridges along the east Pacific margin, e.g., in Chile, ... Many large porphyry Cu-Au deposits are connected to adakitic rocks known to be closely associated with ridge subduction. For example, there are several subducting ridges along the east Pacific margin, e.g., in Chile, Peru, and South America, most of which are associated with large porphyry Cu-Au deposits. In contrast, there are much fewer ridge subductions on the west Pacific margin and porphyry Cu-Au deposits are much less there, both in terms of tonnage and the number of deposits. Given that Cu and Au are moderately incompatible elements, oceanic crust has much higher Cu-Au concentrations than the mantle and the continental crust, and thus slab melts with their diagnostic adakitic chemistry have systematically higher Cu and Au, which is favorable for mineralization. Considering the geotherm of subducting slabs in the Phanerozoic, ridge subduction is the most favorable tectonic setting for this. Therefore, slab melting is the likely link in the spatial association between ridge subduction and Cu-Au deposits. Geochemical signatures of slab melting and hence maybe ridge subduction in less eroded regions in eastern China, the central Asian orogenic belt etc. may indicate important exploration targets for large porphyry Cu-Au deposits. 展开更多
关键词 ridge SUBDUCTION PORPHYRY cu-au deposits ADAKITE SLAB melting
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