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Integration of zircon and apatite U–Pb geochronology and geochemical mapping of the Wude basalts(Emeishan large igneous province):A tool for a better understanding of the tectonothermal and geodynamic evolution of the Emeishan LIP

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Geoscience Frontiers 2021年第2期12卷 573-585页

作者： Jia-Nan Fu franco pirajno Fan Yang Espine Shivute Yi-Zhan Sun Ning Ai Kun-Feng Qiu School of Earth Sciences and Resources China University of GeosciencesBeijing100083China The University of Western Australia 35 Stirling HwyCrawleyWA6009Australia Institute of Geophysical and Geochemical Exploration CAGSLangfang065000China Geological Survey of Ningxia YinchuanNingxia750021China

Radiogenic isotopic dating and Lu–Hf isotopic composition using laser ablation-inductively coupled plasma-mass spectrometry(LA-ICP-MS)of the Wude basalt in Yunnan province from the Emeishan large igneous province(ELIP)yielded timing of formation and post-eruption tectonothermal *** lithogeochemistry and elements mapping of basaltic rocks were further reevaluated to provide insights into crustal contamination and formation of the ELIP.A zircon U–Pb age of 251.3±2.0 Ma of the Wude basalt recorded the youngest volcanic eruption event and was consistent with the age span of 251-263 Ma for the emplacement of the *** zircons hadε_(Hf)(t)values ranging from7.3 to+2.2,identical to those of magmatic zircons from the intrusive rocks of the ELIP,suggesting that crust-mantle interaction occurred during magmatic emplacement,or crust-mantle mixing existed in the deep source region prior to deep *** apatite U–Pb age at 53.6±3.4 Ma recorded an early Eocene magmatic superimposition of a regional tectonothermal event,corresponding to the Indian–Eurasian plate *** Nb,Ta,Ti and P anomalies of the Emeishan basalt may reflect crustal *** uneven Nb/La and Th/Ta values distribution throughout the ELIP supported a mantle plume model ***,the ELIP was formed as a result of a mantle plume which was later superimposed by a regional tectonothermal event attributed to the Indian–Eurasian plate collision during early Eocene.

关键词： Emeishan basalt Zircon and apatite Geochronology Lu-Hf isotope Early Eocene superposition Indian-Eurasian plate collision

Zircon U-Pb age,Hf isotopes and geochemistry of Shuichang Algoma-type banded iron-formation,North China Craton:Constraints on the ore-forming age and tectonic setting

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Zircon U-Pb age,Hf isotopes and geochemistry of Shuichang Al...

中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： franco pirajno School of Earth and Environment University of Western Australia

The Shuichang iron deposit is an Algoma-type BIF in the North China *** Shuichang BIF is interlayered with plagioclase-hornblende gneiss,indicating that these two lithologies are temporally closely associated. We use the content of major elements and their ratios in order to define the protolith of the plagioclasehornblende *** U-Pb dating of zircons from the plagioclase-hornblende gneiss suggests that the Shuichang BIF was formed at ca.2547±7 Ma and was subjected to metamorphism at 2513±4 *** major elements and REE data of the ore,as well as individual magnetite and chert bands indicate that the Shuichang BIF precipitated from hydrothermal fluids discharging on the sea floor and that iron and silica may be associated with submarine volcanic ***-situ Lu-Hf analysis of zircons from the plagioclasehornblende gneiss yielded initial Hf/Hf ratios from 0.280903 to 0.281197 andε(t) values from 10.5 to 0.4 with a weighted mean value of -8.72±*** single stage Hf model age ranges from 2836 Ma to 3249 *** infer that the protolith of the plagioclase-hornblende gneiss originated from the enriched mantle mixed with a small amount of subducted crust *** Shuichang BIF formed at 2.5 Ga and is coeval with other BIFs in North China and in other cratons in the *** propose that the Shuichang BIF was formed in a subduction-related back-arc basin or intra-arc basin,based on the geochemical signatures of the wall *** further point out that the 2.5 Ga global BIF formation peak not only predates the amalgamation of the North China Craton,but probably also record an ancient supercontinent event.

关键词： BIFs Zircon U-Pb age Hf isotopes Amalgamation North China Craton

Re-Os and 40Ar/39Ar ages of the Jiguanshan porphyry Mo deposit,Xilamulun metallogenic belt,NE China,and constraints on mineralization events

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Re-Os and 40Ar/39Ar ages of the Jiguanshan porphyry Mo depos...

中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： franco pirajno School of Earth and Environment University of Western Australia

The large Jiguanshan porphyry Mo deposit,with more than 100 Mt of ore and grades ranging from 0.08% to 0.11%,is located in the newly identified Xilamulun metallogenic belt along the northern margin of the North China *** Mo mineralization is predominantly disseminated in the host granite porphyry,but locally occurs as stockworks in lithic tuff and rhyolitic rocks. Ar/Ar dates of samples from groundmass material in the host granite porphyry,post-ore diabase,and quartz porphyry dikes show plateau ages of 155.1±1.9,149.4±0.9, and 147.6±0.9 Ma,with inverse isochron ages of 156.0±1.8,149.3±1.3,and 148.3±1.2 Ma,respectively. Seven samples of disseminated molybdenite yielded a weighted average Re-Os age of 155.3±0.9 Ma, whereas six veinlet-type molybdenite samples yielded a weighted average Re-0s age of 153.0±0.9 Ma, providing direct timing constraints for the Mo mineralization at 153-155 *** regional geological setting together with the emplacement of post-ore diabase and quartz porphyry dikes in the Jiguanshan deposit,are indicative of an extensional regime in Late Jurassic,which was probably linked to lithospheric extension in northeast China.

关键词： Re-Os Molybdenite ~40Ar/~39Ar dates Jiguanshan porphyry Mo deposit Xilamulun metallogenic belt Northeast China

Model for fluid flow during Cininental collision,exemplified by the Qinling Orogen,China

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Model for fluid flow during Cininental collision,exemplified...

First Meeting Asia Current Research on Fluid Inclusion

作者： franco pirajno Geological Survey of Western Australia Perth

Collisional orogens are characterised by imbricate stacking of crustal slabs. During slab stacking in a compressional regime, the underthrust slab is progressively devolatilized, metamorphosed and partially melted, resulting in extensive fluid circulation and granitic magmatism in the overriding slab (Fig. 1). Therefore, orogenic lode deposits (L), batholithic granitoids (G), and porphyries with their associated deposits (P), are zonally arranged in the

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试论大火成岩省与成矿作用

高校地质学报 2007年第2期13卷 148-160页

作者：肖龙 franco pirajno 何琦中国地质大学地球科学学院武汉430074 Geological Survey of Western Australia 100 Plain Street East PerthWA 6004Australia

根据组成大火成岩省的岩浆类型不同,大火成岩省可以分为两类,一是以基性火成岩为主的镁铁质大火成岩省(MLIPs),二是以酸性火成岩为主的长英质大火成岩省(SLIPs)。它们都是由于在异常高的地幔热流参与下导致地幔或地壳大规模熔融形成的... 详细信息

根据组成大火成岩省的岩浆类型不同,大火成岩省可以分为两类,一是以基性火成岩为主的镁铁质大火成岩省(MLIPs),二是以酸性火成岩为主的长英质大火成岩省(SLIPs)。它们都是由于在异常高的地幔热流参与下导致地幔或地壳大规模熔融形成的。大火成岩省独特的巨量岩浆活动是引起多层次物质和能量交换的重要场所。成矿物质的聚集导致成矿作用和矿床的形成是必然的,因此大火成岩省本身就是一个大成矿系统。在这个成矿系统中,由于物源、成分、温度、压力、流体和氧逸度等条件的差异性,形成不同种类的矿化和矿床,并构成一定的成矿系列。镁铁质大火成岩省中形成的矿床类型有岩浆硫化物型Cr-Cu-Ni-PGE矿床和Ti-Fe氧化物型V-Ti-Fe矿床,热液型的Cu-Pb-Zn-Au-Ag矿床,以及远程低温热液矿床等。长英质大火成岩省形成的矿床类型为岩浆和交代型、热液型Cu-Pb-Zn-Au-Ag,W-Sn,U-Th-REE矿床,以及Sb-As矿床等。加强对大火成岩省及其成矿机理的研究,有望形成新的成矿理论和加速超大型矿床的发现。

关键词：大火成岩省镁铁质大火成岩省长英质大火成岩省成矿作用地幔柱

Mesozoic-Cenozoic intraplate tectonics and magmatism in E and NE China: potential for ore deposits

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Mesozoic-Cenozoic intraplate tectonics and magmatism in E an...

International Conference on Continental Volcanism

作者： franco pirajno Geological Survey of Western Australia 100 Plain StreetPerthWA6004Australia

＜正＞Mesozoic-Cenozoic intraplate tectonism and magmatism affected much of the eastern margin of mainland Asia, extending from Far East Russia, through the Baikal and Mongolia regions to north-eastern and eastern China. These phenomena are broadly linked with a complex series of events, involving subduction, collision, post-collision collapse and rifting. The record of Mesozoic magmatism in eastern and northeastern China （Yanshanian tectono-thermal event;mainly 208-98 Ma） is typically bimodal and comprises A-type and alkaline

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Qiyugou auriferous breccia pipes: A low-sulphidation epithermal system linked with transition of tectonic regime from collisional compression to extension, Xiong ershan, Henan, China

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Global Geology 2021年第1期24卷 23-42页

作者： ZHANG Yuanhou ZHANG Shihong pirajno franco College of Earth Sciences Jilin UniversityChangchun 130061China State Key Laboratory of Biogeology and Environmental China University of GeosciencesBeijing 100083China Geological Survey of Western Australia Perth WA6004Australia

The Xiong’ershan area,as a part of a metallogenic province in cetral China,contains substantial Leimengou porphyry molybdenite deposit,Qiyugou breccia gold deposits and vein gold deposit occurred in fault zone,as well as previously refer to as orogenic gold *** or nearby the Mesozoic porphyry granite,the typical porphyry deposit,much more breccia pipes and breccia gold deposit are developed in the *** this paper we focus on reporting preliminary results obtained from field,petrographic work on the Leimengou porphyry molybdenite and the Qiyugou breccia gold deposit,as well as laser Raman microspectroscopy and microprobe analyses carried out on samples from the Au-bearing Qiyugou breccia *** adularia-calcite assemblage is reported in these breccia gold *** stages of hydrothermal alteration,pervasive and vein,are *** first stage consists of the alteration of the breccia clasts and rock flour by actinolite,green biotite,epidote,chlorite and minor *** hydrothermal activity is likely to relate to the molybdenite mineralisation *** second stage is characterised by quartz veining and adularia and calcite filling *** ores associated with quartz,sericite,and minor calcite alteration occur in NE-trending fault that cut the first stage of *** adularia-calcite alteration is genetically associated with gold *** adularia-calcite assemblage in the area suggest that the Qiyugou pipes are of low-sulphidation epithermal in *** Qiyugou breccia pipes are coeval and spatially associated with the nearby Leimengou porphyry Mo deposit,which together conform to an alkalic mineralising *** propose a model for the development and evolution of the breccia pipes in conjunction with a model that describes the genesis of the porphyry Mo and auriferous breccia pipes as a unified magmatic-hydrothermal system,which is linked with transition from collisional compressional to extensional geodyn

关键词： breccia pipe low-sulfidation porphyry Mo magmatic-hydrothermal system Qiyugou

Possible correlation between a mantle plume and the evolution of Paleo-Tethys Jinshajiang Ocean: evidence from a volcanic rifted margin in the Xiaru-Tuoding area, Yunnan, SW China

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Possible correlation between a mantle plume and the evolutio...

2006年全国岩石学与地球动力学研讨会

作者： franco pirajno Geological Survey of Western Australia 100 Plain StreetEast PerthWA 6004Australia

＜正＞Several Paleozoic sutures in Southwestern China provide a record of the history of Paleo-Tethys whose birth and final closure are associated with the breakup and assembly of Gondwanaland. Recent studies indicate that there are widespread OIB-type mafic volcanic rocks within these suture zones and intervening terranes. This paper examines the geology and

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红海VMS矿床黄铁矿微量元素和同位素微区原位分析及其成因和勘查意义

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中国科学：地球科学 2023年第4期53卷 723-750页

作者：孙志远邓小华 franco pirajno 宿州学院资源与土木工程学院宿州234000 北京矿产地质研究院有限责任公司北京100012 长安大学地球科学与资源学院西部矿产资源与地质工程教育部重点实验室西安710054 Centre for Exploration Targeting School of Earth and EnvironmentUniversity of Western AustraliaCrawleyWA 6008Australia

文章对红海火山成因块状硫化物矿床中黄铁矿的结构、微量元素和硫同位素进行研究,以期限定成矿流体的来源和演化,并对矿床成因和勘查提供新的思路.红海矿床具有上部块状矿体和下部(网)脉状矿体的空间结构特征.研究结果表明,上部草莓状... 详细信息

文章对红海火山成因块状硫化物矿床中黄铁矿的结构、微量元素和硫同位素进行研究,以期限定成矿流体的来源和演化,并对矿床成因和勘查提供新的思路.红海矿床具有上部块状矿体和下部(网)脉状矿体的空间结构特征.研究结果表明,上部草莓状黄铁矿(Syn-Py)的结构和同位素特征指示其形成于生物同沉积成因过程.上部块状矿石不同层位的黄铁矿(M-Py1、M-Py2、M-Py3)具有较高的Au、Ag、Cu、Zn、Pb、Sb、Tl含量和较低的Co、Se、Te、Ti、Sn含量,表明其形成于富金属的中高温(200~400℃)氧化性流体环境.块状矿体下层黄铁矿(M-Py4)具有高的Te、Ti、Sn含量和高的Co/Ni值,与之共生的磁铁矿具有高的Ti、V、Cr、Ni含量和低的Al、Mn、Zn含量,表明二者形成于高温(300~500℃)氧化条件.而下部(网)脉状矿石中的黄铁矿(V-Py1、V-Py2、V-Py3)以低Au、Ag、Cu、Zn、Pb、Sb、Tl含量和高Co、Se、Te、Ti含量以及高Co/Ni值为特征,指示其形成于中高温环境.硫同位素组成特征(δ^(34)S=-6.4‰~+29.9‰)表明成矿流体来自深部岩浆源并受海水影响显著.浸染状矿化中的黄铁矿(D-Py)在结构、微量元素和同位素组成特征上具有“过渡”的特征,其核部继承块状矿化特征,而边部继承(网)脉状矿化特征.红海矿床不同深度就位矿体中黄铁矿微量元素及比值(如Co、Te、Ti、Se、As、Au、Pb、Sb、Tl、Ag、Cu、Zn和Co/Ni、Co/Sb、Se/As)在空间上有规律的变化特征,可以作为寻找块状工业矿体的指示标识.此外,尽管上部块状矿体和下部(网)脉状矿体中黄铁矿δ^(34)S值无明显差异,但其δ^(34)S峰值亦可作为寻找块状矿体的重要标识.

关键词：黄铁矿原位微量元素原位硫同位素成矿流体红海VMS矿床