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Acta Geologica Sinica(English Edition) 2024年第3期98卷 641-656页

作者： WANG Qiuyu CHEN Shouming ZHANG Hongrui LI Saisai SinoProbe Laboratory Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China Guangxi Key Laboratory of hidden Metallic ore Deposit Exploration GuilinGuangxi 541004China

High-silica granitoids record the formation and evolution of the continental crust.A new intrusive complex has been recognized among silicic volcanic rocks of the Weixi arc,Southwest *** intrusions consist of granites,granitic porphyries,and *** U-Pb age data indicate that the Weixi granitoids formed at 248-240 Ma and were coeval with silicic volcanic rocks of the Weixi *** Weixi granitoids are enriched in Rb,Th,and U,depleted in Ba,Sr,Nb,Ta,and Ti,and have high light/heavy rare earth element ratios and slightly negative Eu *** Weixi granitoids have negative ε_(Nd)(t)values(-9.8 to-7.8)and negative zircon ε_(Hf)(t)values(-12.02 to-5.11).The geochemical and isotopic features suggest the Weixi granitoids were derived by partial melting of ancient crustal *** Weixi granitoids and silicic volcanic rocks were derived from the same magma by crystal accumulation and melt extraction,respectively,and they record the formation of a continental arc in the central Sanjiang orogenic belt.

关键词： granitoids geochemistry crystal accumulation continental crust Sanjiang orogen

Hot subduction in the southern Paleo-Asian Ocean:Insights from clinopyroxene chemistry and Sr-Nd-Hf-Pb isotopes of Carboniferous volcanics in West Junggar

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Geoscience Frontiers 2024年第1期15卷 155-174页

作者： Yao Xiao Xijun Liu Wenjiao Xiao Xiao-Han Gong Hao Wu Yujia Song Zhiguo Zhang Pengde Liu Guangxi Key Laboratory of hidden Metallic ore deposits Exploration College of Earth SciencesGuilin University of TechnologyGuilin 541004China Collaborative Innovation Center for Exploration of Nonferrous Metal deposits and Efficient Utilization of Resource Guilin University of Technology Guilin 541004China National Key Laboratory of Ecological Security and Resource Utilization in Arid Areas Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China College of Civil Engineering Hexi UniversityZhangye 734000China

The chemical evolution and pressure-temperature conditions of subduction zone magmatism along ancient suture zones in orogenic belts can provide important information regarding plate convergence processes in *** magmatism in West Junggar is key to understanding the tectonothermal and subduction history of the Junggar Ocean,which was a branch of the Paleo-Asian Ocean,as well as the accretionary processes in the southwestern Central Asian Orogenic Belt(CAOB).We undertook a geochronological,mineralogical,geochemical,and Sr-Nd-Hf-Pb isotopic study of volcanic rocks from the Baikouquan area of West *** used these data to determine the petrogenesis,mantle source,and pressure-temperature conditions of these magmas,and further constrain the subduction and tectonic history of the Junggar *** studied volcanic rocks yielded zircon U-Pb ages of 342-337 Ma and are characterized by enrichments of large-ion lithophile elements(LILEs),and depletions in high-field-strength elements(HFSEs),indicative of an island arc *** volcanic rocks have positiveƐNd(t)(5.83-7.04)andƐHf(t)(13.47-15.74)values,87Sr/86Sr(t)ratios of 0.704023-0.705658,and radiogenic 207Pb/204Pb(t)and 208Pb/204Pb(t)ratios at a given 206Pb/204Pb(t)ratio,indicative of a depleted mantle source contaminated by subduction-related *** modeling calculations indicate that≤1%of a subduction component comprising fluid and sediment melt could have generated the source of the parental melts of the Baikouquan volcanic *** phenocrysts in the volcanic rocks are classified as high-and low-Ti clinopyroxene,and pressure-temperature calculations suggest the host rocks formed at high temperatures(~1300℃)and shallow to moderate depths(<2 GPa).The magma was probably generated by hot and hydrous melting in a mantle wedge in response to subduction of young,hot oceanic *** present results,combined with published data,suggest that the Baikouquan volcanic r

关键词： Hot subduction Sr-Nd-Hf-Pb isotopes Clinopyroxene chemistry West Junggar Central Asian Orogenic Belt

The Boundary Between Gondwana and Pacifica and the Suturing Ages of Their Allied Terranes in Southwestern China

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Acta Geologica Sinica(English Edition) 1991年第1期65卷 87-95页

作者： Guo Fuxiang institute of prediction of hidden ore deposits, Guilin College of Metallurgical Geology, Guilin 541004, Guangxi institute of prediction of hidden ore deposits Guilin College of Metallurgical Geology Guilin 541004 Guangxi

Two terranes formed since the Late Palaeozoic can be distinguished in southwestern China. One is charac-terized by the Permo-Carboniferous ice-rafted marine gravel-bearing clastic formation and the cold-water faunaof the Gondwana facies, including the Gangmar Co, Lhasa, Sa' gya, Tengchong and Baoshan terranes and theother is marked by the Upper Palaeozoic of the Yangtze type with the Cathaysian flora and the Pacific-typefusulinids, comprising the Changning-Menglian, Shuangjiang-Lancang, Qamdo and Bayan Har terranes. TheLongmu Co-Shuanghu-Dengqen-North Lancang River-Kejie-Mengding suture zone between the two groups ofterranes is the boundary between Gondwana and Pacifica in southwestern China. On the grounds of thesedimentary formation and successive southwestward migration of the Asian nonmarine Jurassic-Cretaceousendemic bivalves, the ages of the suture and some terranes to the southwest of the suture zone are *** Baoshan terrane and the Nyainrong-Sog terrane in the Lhasa composite terrane were firstly pieced togeth-er with the Asian continent in the early Early Jurassic. The northern Tibet-western Yunnan microplate, in-cluding the Gangmar Co, Lhasa and Tengchong terranes, collided with the Asian continent at the end of theEarly Cretaceous Neocomian.

关键词： The Boundary Between Gondwana and Pacifica and the Suturing Ages of Their Allied Terranes in Southwestern China

CHARACTERISTICS OF THE TRIGONIOIDACEAN EVOLUTION AND THE REGULARITY OF THEIR GENETIC MATERIAL MUTATIONS

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Science China Chemistry 1992年第8期35卷 991-1004页

作者：郭福祥 institute of prediction of hidden ore deposits Guilin College of Geology Guilin 541004 PRC

The paper discusses the characteristics of the trigonioidacean evolution, including stagecharacter, pattern of the punctuated equilibria, periodic reappearance phenomenon of similarmorphology and synchronous orientation *** indicates that the trigonioida-ceans were themselves the material foundation cf their *** is pointed out that thecharacteristics reflect the regularity of their genetic material mutations.

关键词： bivalves punctuated equilibria synchronous orientation parallelism isomorphism genetic material mutation

Affinity between Palaeozoic Blocks of Xinjiang and Their Suturing Ages

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Acta Geologica Sinica(English Edition) 2000年第1期74卷 1-6页

作者： GUO Fuxiang Research Centre of prediction of hidden ore deposits Guilin Institute of Technology Guilin 541004

Abstract: The Kazakhstanian plate was near the Tarim, Sino-Korean and South China-Southeast Asian plates in the Middle-Late Cambrian and Late Ordovician, and approached the Siberian plate in the other periods of the Early Palaeozoic. The Ili and Toksun-Yamansu terranes had been split from the Tarim plate before the Middle Devonian and then went close to Angaraland in the late Early Permian. The Beishan area on the northeastern margin of the Tarim plate came close to Angaraland first in the early Early Permian. The suturing age between the Tarim and Kazakhstanian-Siberian plates is generally the same as that between the Turkey-Central Iran-Gangdise and South China-Southeast Asian plates. The suturing event took place in the early Early Permian, while the corresponding tectogeny occurred between the Early and Late Permian.

关键词： plate terrane affinity suturing age Xinjiang

Meso-Cenozioc Tectonic Attribute of Southern China and Folding of the Nanhua (South Cathay) Orogenic Belt

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Acta Geologica Sinica(English Edition) 1998年第1期72卷 121-126页

作者： GUO Fuxiang Research Centre of prediction of hidden ore deposits Guilin Institute of Technology Guilin Guangxi 541004

The Meso-Cenozoic tectonic attribute of southern China is a continental tridirectional orogenic belt formed by subsynchronous interaction among the Tethys, Northwest Pacific and Kunlun-Qinling tectonic domains. It was created by superimposition of repeated orogenies since the Late Permian. The Indosinian folds therein are gentle and localized.

关键词： continental tridirectional orogenic belt platform cover Indosinian orogeny Meso-Cenozoic southern China

Neoproterozoic I-type granites in the Central Tianshan Block (NW China):geochronology,geochemistry,and tectonic implications

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Journal of Arid Land 2022年第1期14卷 82-101页

作者： SONG Yujia LIU Xijun XIAO Wenjiao ZHANG Zhiguo LIU Pengde XIAO Yao LI Rui WANG Baohua LIU Lei HU Rongguo Guangxi Key Laboratory of hidden Metallic ore deposits Exploration College of Earth SciencesGuilin University of TechnologyGuilin 541004China Xinjiang Research Center for Mineral Resources Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Collaborative Innovation Center for Exploration of Nonferrous Metal deposits and Efficient Utilization of Resource Guilin University of TechnologyGuilin 541004China

The Central Tianshan Block is one of numerous microcontinental blocks within the Central Asian Orogenic Belt(CAOB)that overlies Precambrian basement *** the evolution of these ancient basement rocks is central to understanding the accretionary and collisional tectonics of the CAOB,and their place within the Rodinia ***,to date,the timing and tectonic settings in which the basement rocks in the Central Tianshan Block formed are poorly constrained,with only sparse geochemical and geochronological data from granitic rocks within the northern segment of the ***,we present a systematic study combining U-Pb geochronology,whole-rock geochemistry,and the Sr-Nd isotopic compositions of newly-identified granitic gneisses from the Bingdaban area of Central Tianshan *** analyzed samples yield a weighted mean Neoproterozoic 206Pb/238U ages of 975-911 *** weakly-peraluminous granitic rocks show a common geochemical I-type granite *** granitic gneisses are calc-alkaline and enriched in large ion lithophile elements(LILEs)and light rare earth elements(LREEs),but they are depleted in high field strength elements(HFSEs);these characteristics are similar to those of typical subduction-related *** samples show initial(^(87)Sr/^(86)Sr)(t)ratios between 0.705136 and *** forεNd(t)in the granitic gneisses are in the range from-5.7 to-1.2,which correspond to Nd model ages of 2.0-1.7 Ga,indicating a role for Mesoproterozoic to Paleoproterozoic rocks in the generation of the granitic *** documented geochemical features indicate that the protoliths for the gneisses have a similar petrogenesis and magmatic source,which may reflect partial melting of thickened crust with the addition of small amounts of mantle-derived *** Central Tianshan Block probably constitute part of an exterior orogen that developed along the margin of the Rodinian supercontinent during the Early Neoproterozoic and underw

关键词： Neoproterozoic I-type granites geochronology Central Tianshan Block Rodinian supercontinent Central Asian Orogenic Belt(CAOB)

Using electrogeochemical approach to explore buried gold deposits in an alpine meadow-covered area

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Acta Geochimica 2018年第3期37卷 402-413页

作者： Panfeng Liu Xianrong Luo Meilan Wen Jiali Zhang Wen Gao Fei Ouyang Xuchuan Duan Earth Sciences of Guilin University of Technology Guilin 541006 China Research institute of prediction of hidden deposits Guilin University of Technology Guilin 541006 China

Exploration for buried gold ores and other deeply buried ores, especially in high altitude localities, is one of the tough challenges facing the geological world *** and efficient ore prospecting methods are badly needed to deal with the situation. This paper documents a test that, for the first time, uses an electrogeochemical approach to prospect ores in the alpine meadow-covered Bangzhuoma area and its periphery in Qinghai–Tibet *** results were compared with conventional soil measurements from a 2 D prospection, and an ideal model of electrogeochemical anomaly formation in the area was established based on the comparison in order to provide theoretical guidance to buried ore prospecting in areas with similar conditions. The research shows that:(1) For exploration of deeply-buried mineral deposits, an electrogeochemical approach is better than soil measurements in terms of correspondence between element content values and anomaly forms and spatial distribution of known deposits in sections. Anomalies of high to low temperature element associations(Bi–Mo; Au–Ag–As–Bi and Au–Ag)and clear zonation were also observed along vertical vein runs in the sections. Based on integration of the observation with geological characteristics of the sections, we propose to use Au, Ag and As as the electrogeochemical indicators and Bi and Mo as the electrogeochemical tracing elementsto guide further analysis.(2) Judging from element statistics and the scale, intensity, and range of anomalies in plan maps, we found that an electrogeochemical approach is less affected by topography and secondary actions. The plan maps also show that elemental differentiation coefficients of the study area are in an ascending order of Ag(0.67) \ Mo(0.85) \ Bi(0.97) \ Au(1.51) \ As(2.35),better representing the element distribution in the area and yielding more striking and concentrated anomalies for known deposits than that of the soil measurements. Apart from that, electrogeochemical a

关键词： Electrogeochemistry Buried mineral deposit Ideal anomaly model Alpine-meadow covered Ihunze

Origin of the DUPAL anomaly in the Tethyan mantle domain and its geodynamic significance

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Science China Earth Sciences 2023年第12期66卷 2712-2727页

作者： Xijun LIU Jifeng XU Wenjiao XIAO Pengde LIU Guangxi Key Laboratory of hidden Metallic ore deposits Exploration&Collaborative Innovation Center for Exploration of Nonferrous Metal deposits and Efficient Utilization of Resources in Guangxi College of Earth SciencesGuilin University of TechnologyGuilin 541004China School of Earth Sciences and Resources China University of GeosciencesBejing 100083China National Key Laboratory of Arid Area Ecological Security and Sustainable Development State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 83001lChina

Mantle heterogeneity has revealed systematic differences in Pb isotopic compositions between the Indian OceanSouth Atlantic mantle in the Southern Hemisphere and the Pacific Ocean-North Atlantic mantle in the Northern *** large-scale difference in mantle isotopes in the Southern Hemisphere is known as the DUPAL anomaly,but its origin remains *** on a systematic review of the Nd-Pb isotopic evolution of the Tethyan mantle domain,this study identified the long-term presence of the DUPAL anomaly in this domain since the early Paleozoic,characterized by long-term and high mantle thorium/uranium(Th/U)*** comparing the Nd-Pb isotopic compositions of the Tethyan mantle domain with the Panthalassic-Pacific mantle domain(the Paleo-Asian,Paleo-Pacific,and modern Pacific oceans),it is shown that the mantle initially had low Th/U features due to early Earth crust-mantle differentiation,with the crust having high Th/U *** such,the mantle initially had uniformly low Th/U ratios that were inherited throughout the Panthalassic-Pacific mantle ***,the plate tectonics and continental collisions in the Tethyan domain affected its characteristics,leading to the long-term and large-scale DUPAL *** the opening of and subduction in the Tethys Ocean,Gondwanaland fragmentation and frequent continent-continent collisions led to long-term and extensive crust-mantle interactions and the continuous input of highTh/U mantle sources,which thus modified the *** process formed not only the unique DUPAL anomaly in the Tethyan mantle domain,but also the Tethyan tectonic domain dominated by continental ***,the high DUPAL anomaly in the Proto-and Paleo-Tethyan mantle domains records the effects of mantle plumes,which might have occurred primarily during the formation of the Proto-and Paleo-Tethys oceans during the early evolution of the Tethyan ***,the inherent coupling of mantle domain properties and plat

关键词： Tethyan domain DUPAL anomaly Large low-shear-velocity provinces(LLSVPs) Ophiolite Geodynamics

Devonian-Carboniferous Hangenberg Crisis in South China:Variations in Trace Elements,Strontium and Carbon Isotope Chemostratigraphy in the Nanbiancun Carbonate Section

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Acta Geologica Sinica(English Edition) 2022年第4期96卷 1166-1180页

作者： DENG Faliang LIU Xijun YU Hongxia YAO Ye ZHANG Zhiguo WEI Weilie LI Rui Guangxi Key Laboratory of hidden Metallic ore Deposit Exploration College of Earth SciencesGuilin University of TechnologyGuilin 541004China Collaborative Innovation Center for Exploration of Nonferrous Metal deposits and Efficient Utilization of Resources Guilin University of TechnologyGuilin 541004China Xinjiang Research Center for Mineral Resources Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China

The global Hangenberg Crisis or Hangenberg Extinction is a mass extinction near the Devonian-Carboniferous *** research of petrology and geochemistry on the Devonian-Carboniferous boundary,as exposed in the Nanbiancun auxiliary stratotype section,South China,elucidates paleoenvironmental changes and controls on marine strontium(^(87)Sr/^(86)Sr)and carbonate carbon(δ^(13)C_(carb))isotopes during the Hangenberg *** new^(87)Sr/^(86)Sr data reveal a regression in the Middle Siphonodella praesulcata Zone,while the Hangenberg Extinction was occurring in South ***,theδ^(13)C_(carb)data records a negative excursion near the base of the Middle Siphonodella praesulcata Zone that may have been connected with the Hangenberg Extinction.A positiveδ^(13)C_(carb)excursion,corresponding with the Upper Siphonodella praesulcata Zone,may reflect the effects of a vigorous biological *** magnitude of the Hangenberg Carbon Isotopic Excursion in peakδ^(13)carb values andδ^(13)C_(carb)gradient in carbonate Devonian-Carboniferous boundary sections of the South China Craton during the Hangenberg Crisis,are a function of depositional water depth and distance from the *** carbon cycling during the Hangenberg Carbon Isotopic Excursion had a much stronger impact on oceanic surface waters than on the deep ocean and theδ^(13)C_(carb)gradient of local seawater was likely caused by enhanced marine productivity,associated with biological recovery in platform sediments during the Hangenberg Crisis.

关键词： strontium and carbon isotopes Nanbiancun auxiliary stratotype section Hangenberg Crisis Devonian-Carboniferous boundary South China