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Lithological and Si–O–S isotope geochemistry:constraints on the origin and genetic environment of the selenium(Se)-rich siliceous rocks in Enshi,Hubei Province,China

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Acta Geochimica 2021年第1期40卷 89-105页

作者： Caixia Feng Shen Liu ian m.coulson State Key Laboratory of Continental Dynamics and Department of Geology Northwest UniversityXi'an 710069China Solid Earth Studies Laboratory Department of GeologyUniversity of ReginaReginaSK S4S 0A2Canada

Se-rich black rock series of the middle and Late Permian system is widely distributed in Enshi Prefecture with an exposed area of 850 km~2,among which the unique Yutangba black rock series independent selenium deposit with industrial mining significance in the world is ***,the source and metallogenic mechanisms of Se are still *** general,terrestrial weathering and submarine hydrothermal processes are the main source end members of Si and Se,and the related siliceous rocks record the deposition process of Si and Se from different *** study of lithofacies and paleogeography shows that western Hubei belongs to the near eastwest turn of the Yangzi platform in the middle and Late Permian and becomes an inter-platform basin with nearly north-south ***,the comparative study of the Yutangba deposit and the selenium-rich black rock series in the northern Shadi with high selenium content is expected to reveal the provenance evolution of the two sections in space,and further restrict the Se mineralization mechanism in the Enshi *** the element geochemistry study,the black rock series in two study areas may have formed in a transitional position of either the continental margin or continental slope,in the process of sedimentary,more terrigenous clastic materials *** are rich in lithophile elements V and Cr.δU>1.0,U/Th and V/(V+Ni)ratio indicate that the Se-rich strata of black rock series in the Enshi areas occurred in an anoxic reducing environment and formed in an environment between the ocean basin and the continental *** Si-O isotope geochemistry,the original Si source of the study area is thought to relate to a volcanic eruption,which leads to the enrichment of Si in the *** determined values of S isotope in the black rock series of the two study areas both show the characteristics related to organic reduction/biogenic.

关键词： Se-rich siliceous rocks Geochemistry Si–O–S isotope Origin Sedimentary environment

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Geochemical constraints on the origin of Early Cretaceous alkaline intrusions and its tectonic implication,Sulu Orogenic Belt,Eastern North China Craton

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Acta Geochimica 2020年第5期39卷 616-641页

作者： Shen Liu Caixia Feng Yan Fan Kairui Tai Tianjing Gao ian m.coulson State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi'an 710069China Solid Earth Studies Laboratory.Department of Geology University of Regina.ReginaSK S4S 0A2Canada

Post-orogenic alkaline intrusions from the Sulu Orogenic Belt of eastern North China Craton consist of A-type *** this study,we report U-Pb zircon ages,geochemical data,Sr-Nd-Pb,and zircon Hf isotopic data for these *** LA-ICP-mS U-Pb zircon analyses yield consistent ages ranging from 127.1±2.4 to 119.5±4.8 ma for four *** alkaline rocks are characterized by high total alkalis(K2 O+Na2 O=8.32-10.11 wt%),light rare-earth element enrichment,and heavy rare-earth element depletion,with a wide range(La/Yb)N values(20-48),moderate negative Eu anomalies(Eu/Eu*=0.50-0.74),enrichment in large-ion lithophile elements(LILEs,i.e.,Rb,Th,U and Pb),and depletion in Ba,Sr and high field strength elements(HFSEs,i.e.,Nb,Ta,and Ti),high(87Sr/86Sr)i ranging from 0.708 to 0.7089,low sNd(t)values from-19.4 to-16.8,(206Pb/204Pb)i=16.751-16.935,(207Pb/204Pb)i=15.381-15.535,(208-Pb/204Pb)i=37.472-37.838,negativeεHf(t)values between-21.3 and-25.7 for the magmatic zircons,and larger TDm2 model ages from 2.5 to 2.8 *** results suggest that the rocks were derived from a common enriched lithospheric mantle source that was metasomatized by foundered lower crustal eclogitic materials before magma ***,the geochemical and isotopic feature implies that the primary magma of these rocks originated through partial melting of ancient lithospheric mantle that was variably hybridized by melts derived from lower crust *** rocks in this study may have been generated by subsequent fractionation of potassium feldspar,plagioclase,ilmenite,and/or ***,negligible crustal contamination occurred during the diagenesis process.

关键词： Post-orogenic magmatism Alkaline rocks Contamination Sulu Orogenic Belt North China Craton

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Zircon U–Pb dating,geochemical,and Sr–Nd–Pb–Hf isotopic constraints on the age and origin of intermediate to felsic igneous rocks at South Altyn,Xinjiang,China

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Acta Geochimica 2020年第5期39卷 698-716页

作者： Shen Liu Caixia Feng Yan Fan Xiaoqing Chen Yuhong Yang Huibo Zhao ian m.coulson State Key Laboratory of Continental Dynamics and Department of Geology Northwest University229 Taibai RoadXi'an 710069China College of Earth Sciences Jilin University2199 Jianshe RoadChangchun 130061China Solid Earth Studies Laboratory Department of GeologyUniversity of ReginaReginaSK S4S 0A2Canada

As a part of a giant trending fault system in the Asian continent and one where a strong zone of left strikeslip fault is present,the Altyn Orogenic belt(AOB)has become an important focus for *** rocks are widely distributed across the ***,many investigations have focused primarily on Paleozoic igneous rocks;discussion of mesozoic related igneous activity is often *** we present the result of studies of representative diorite and granite rocks outcropping in the AOB,within the Xinjiang Uygur Autonomous Region,South Altyn,*** present new zircon LA-ICP-mS U-Pb age,geochemical,and Sr-Nd-Pb-Hf isotopic data for these sample suites,identifying them as typical igneous rocks formed between 238±1.5 and 238.8±1.1 *** rocks that we studied fall into the alkaline series,also enriched in light rare earth elements(LREE),some large ion lithophile elements(LILE;e.g.,Rb,Ba,Sr,and K),Pb,Th and U,and depleted in heavy rare earth elements(HREE),Nb,Ta,Hf,and *** granite and diorite have high initial 87Sr/86Sr ratios(0.7062-0.7114),negativeεNd(t)values(-8.8 to-11.3),εHf(t)values(-8.7 to-18.7),and relatively constant Pb isotopic ratios((206-Pb/204Pb)i=6.74-17.884,(207Pb/204Pb)i=15.51-15.58,and(208Pb/204Pb)i=35.36-38.04),*** suggests that the magmas parental to these rocks were generated from the partial melting of the ancient *** parental magmas to these rocks experienced a degree of fractionation of plagioclase,K-feldspar,and hornblende,possibly during rapid magma *** on these studies,we propose a reasonable model for the origin of the investigated rocks from the Xinjiang Uygur Autonomous Region of South Altyn,which involves crustal thickening,lithospheric extension,and asthenosphere upwelling,that induced crustal melting.

关键词： Altyn orogenic belt Zircon U–Pb dating Geochemistry,Sr–Nd–Pb–Hf isotope Origin

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mantle plume:the dynamic setting of the origin of Early Paleozoic mafic dykes in Ziyang,Shaanxi Province,Southern Qinling Block,China

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Acta Geochimica 2020年第3期39卷 307-325页

作者： Xiaoqing Chen Shen Liu Caixia Feng ian m.coulson Yan Fan Kairui Tai Tianjing Gao Siyuan Zhang College of Earth Science Jilin UniversityChangchun 130061China State Key Laboratory of Continental Dynamics and Department of Geology Northwest UniversityXi'an 710069China Solid Earth Studies Laboratory Department of GeologyUniversity of ReginaReginaSK S4S 0A2Canada

The mafic dykes(dolerites)during the Early Paleozoic are widely spread in Langao-Ziyang,southern Qiling Block,and the investigation on these dykes are very *** studies have mainly focused on the Silurian mafic dykes;however,research on the Earlier Paleozoic mafic dykes is relatively weak at ***,the overall understanding of the mantle source and genetic dynamic setting during the Early Paleozoic in this area is *** study the accurate age and origin of the Early Paleozoic mafic dykes in Ziyang,southern Shaanxi Province,the mafic dykes from dabacunand Qinmingzhai were selected and the petrology,zircon U-Pb chronology,geochemistry,and Sr-Nd-Hf isotopes were *** indicates that the mafic dykes studied are mainly composed of dolerite,and they are the products of the Early Ordovician(475.8-480.7 ma).Furthermore,the dolerites belong to alkaline rock series,and they are characterized by enrichment in LREE,Rb,Ba,Sr,Nb,(87Sr/86Sr)i=0.7020-0.7050,εNd(t)=3.0-4.0),εHf(t)=4.5-12.1,176Hf/177Hf=*** suggests that the mafic dyke were derived from the partial melting of a depleted lithospheric mantle,and the genetic process is mainly controlled by the mantle plume based on the discussion of the genetic ***,the genetic process experienced the separation and crystallization of olivine and clinopyroxene at the same time,with little crustal contamination.

关键词： Early Paleozoic Dolerites Geochemistry Origin mantle plume

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Zircon U-Pb Age,Geochemical,and Sr-Nd-Pb-Hf Isotopic Constraints on the Time Frame and Origin of Early Cretaceous mafic Dykes in the Wuling mountain Gravity Lineament,South China

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Acta Geologica Sinica(English Edition) 2021年第2期95卷 419-438页

作者： CHEN Xiaoqing LIU Shen FENG Caixia XU Jingyan ZHAO Huibo FENG Guangying ian m.coulson SUN Jinggui FAN Yan College of Earth Sciences Jilin UniversityChangchun 130061China State Key Laboratory of Continental Dynamics and Department of Geology Northwest UniversityXi'an 710069China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China Solid Earth Studies Laboratory Department of GeologyUniversity of ReginaReginaSaskatchewan S4S 0A2Canada

In view of the importance of mafic dyke swarms and their contribution to current scientific problems relating to South China,herein,we present the findings of studies on twenty–five representative mafic dykes cropping out in Hunan Province and Guangxi Zhuang Autonomous Region,within the southern Wuling mountain gravity lineament,*** results include new zircon LA-ICP-mS U-Pb age,whole rock geochemical,Sr-Nd-Pb isotopic,and zircon Hf isotopic data for these *** dykes formed between 131.5±1.2 and 121.6±1.1 ma,and have typical doleritic *** fall into the alkaline and shoshonitic series,are enriched in light rare earth elements(LREE),some large ion lithophile elements(LILE;e.g.,Rb,Ba,and Sr),Th,U,and Pb,and are depleted in Nb,Ta,Hf,and ***,the dolerites have high initial 87 Sr/86 Sr ratios(0.7055–0.7057),negativeεNd(t)and zirconεHf(t)values(-14.8 to-11.9,-30.4 to-14.9),and relatively constant initial Pb isotopic ratios(that are Em1-like,16.77–16.94,15.43–15.47,and 36.84–36.92 for 206 Pb/204 Pb,207 Pb/204 Pb,and 208 Pb/204 Pb,respectively).These results indicate that the dykes were likely derived from magma generated through low-degree partial melting(1.0%–10%)of an Em1-like garnet–lherzolite mantle *** parental magmas fractionated olivine,clinopyroxene,plagioclase,and Ti-bearing phases with negligible crustal contamination,during ascent and dyke *** possible models have been proposed to explain the origin of mesozoic magmatism along the Wuling mountain gravity *** we propose a reasonable model for the origin of these mafic dykes,involving the collision between the paleo-Pacific Plate and South China,which led to subsequent lithospheric extension and asthenosphere upwelling,resulting in partial melting the underlying mantle lithosphere in the Early Cretaceous,to form the parental magmas to the WmGL mafic dykes,as studied.

关键词： mafic dykes magmatic origin Early Cretaceous Wuling mountain gravity lineament South China

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Geochronology and Genetic model for Early Cretaceous Volcanic Rocks from the Southern Qiangtang Terrane,Northern Tibet,China: Constraints from U-Pb Zircon Dating, Whole-Rock Geochemical and Sr-Nd Isotopic Data

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Acta Geologica Sinica(English Edition) 2018年第6期92卷 2157-2178页

作者： LIU Shen FENG Caixia m.Santosh FENG Guangying XU mengjing ian m.coulson GUO Xiaolei GUO Zhuang FAN Yan State Key Laboratory of Continental Dynamics and Department of Geology Northwest UniversityXi'an 710069China China University of Geosciences Beijing 100083 BeijingChina Department of Earth Sciences University of AdelaideAdelaide SA 5005Australia Institute of Geology Chinese Academy of Geological Sciences100037 BeijingChina Solid Earth Studies Laboratory Department of GeologyUniversity of ReginaReginaSaskatchewan S4S OA2Canada

Post-collisional volcanic rocks of mesozoic age occur in the regions adjacent to Gerze, part of the southern Qiangtang Terrane of northern Tibet, China. Geochronological, geochemical, and wholerock Sr-Nd isotopic analyses were performed on the volcanic rocks to better characterize their emplacement age and models for their origin. Laser ablation-inductively coupled plasma-mass spectrometry(LA-ICP-mS) U-Pb zircon analyses yielded consistent ages ranging from 123.1±0.94 ma to 124.5±0.89 ma for six volcanic rocks from the study area. The intermediate volcanic rocks belong to the alkaline and sub-alkaline magma series in terms of K2 O+Na2 O contents(5.9%–9.0%), and to the shoshonitic and calc-alkaline series on the basis of their high K2 O contents(1.4%–3.3%). The Gerze volcanic rocks are characterized by the enrichment of light rare earth elements [(La/Yb)N=34.9–49.5] and large–ion lithophile elements(e.g., Rb, Ba, Th, U, K, Pb, and Sr), slightly negative Eu anomalies(Eu/Eu*=0.19–0.24), and negative anomalies in high field strength elements(e.g., Nb, Ta, Hf and Ti), relative to primitive mantle. The samples show slightly elevated(87 Sr/86 Sr)i values that range from 0.7049 to 0.7057, and low εNd(t) values from-0.89 to-2.89. These results suggest that the volcanic rocks studied derived from a compositionally heterogeneous mantle source and that their parent magmas were basaltic. The more mafic, parental magmas to the Gerze volcanic rocks likely underwent fractional crystallization of clinopyroxene, hornblende, biotite, and potassium feldspar, during ascent, with little to no crustal contamination, prior to their eruption/emplacement. While these volcanic rocks exhibit geochemical signatures typical of magmas formed in a destructive plate-margin setting, it is plausible that their mantle source might also have acquired such characteristics in an earlier episode of subduction.

关键词： volcanic rock U–Pb age–dating origin Qiangtang Terrane northern Tibet

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Diffusion of Sm-Nd in Scheelite and its Significance to Isotopic Dating and Tracing

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Acta Geologica Sinica(English Edition) 2023年第2期97卷 651-661页

作者： ZHANG Dongliang ian mcoulson PENG Jiantang LI Shijie WANG Guoqiang Key Laboratory of metallogenic Prediction of Nonferrous metals Ministry of EducationSchool of Geosciences and InfophysicsCentral South UniversityChangsha 410083China Solid Earth Studies Laboratory Department of GeologyUniversity of ReginaReginaSaskatchewan S4S OA2Canada Lunar and Planetary Science Research Center Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Xi'an Center of Geological Survey CGSXi'an 710054China

As the principal ore mineral in various tungsten(-gold)deposits,scheelite(CaWO_(4))plays an important role in directly dating the timing of ore formation,and in tracing associated material sources through the study of its Sm-Nd geochronology and Nd isotopic *** the retention of Sm-Nd systematics within scheelite is presently unconstrained,equivocal interpretations for isotopic data resulting from this method have occurred quite often in previous studies that apply these isotopic *** order to better elucidate the closure of Sm-Nd in scheelite,the kinetics of Sm and Nd within this mineral lattice were investigated through calculation of diffusion constants presented *** following Arrhenius relations were obtained:D_(Nd)=4.00exp(-438 kJ·mol^(–1)/RT)cm^(2)/s D_(Sm)=1.85exp(-427 kJ·mol^(–1)/RT)cm^(2)/s showing diffusion rate of Nd is near identical to Sm in scheelite when at the same ***,compared to other rare earth elements(REEs),which have markedly different atomic radii to either Nd or Sm,these are shown to exhibit a great variation in *** observed trends in our data are in excellent agreement with the diffusion characteristics of REEs in other tetragonal ABO4 minerals,indicating that ionic radius is a key constraint to the diffusivity of REEs in the various crystal *** this in mind,the same substitution mechanism and a very slight discrepancy in radii will allow us to infer that significant Sm/Nd diffusional fractionation in scheelite is unlikely to occur during most geological *** upon the diffusion data determined herein,Sm and Nd closure temperatures and retention times in scheelite are discussed in terms of diffusion *** results suggest that closure temperatures for Sm-Nd within this mineral are relatively high in contrast to the temperature ranges of ore-formation responsible for scheelite-related deposits,and any later thermal *** is likely,therefore,that rel

关键词： Sm-Nd system diffusion scheelite closure temperature isotopic dating

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U-Pb Zircon Age, Geochemical, and Sr-Nd-Pb Isotopic Constraints on the Age and Origin of mafic Dykes from Eastern Shandong Province, Eastern China

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Acta Geologica Sinica(English Edition) 2013年第4期87卷 1045-1057页

作者： LIU Shen HU Ruizhong FENG Caixia GAO Shan FENG Guangying LAI Shaocong QI Youqiang ian m. coulson YANG Yuhong YANG Chaogui TANG Liang State Key Laboratory of Continental Dynamics /Department of Geology Northwest University State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences State Key Laboratory of Geological Processes and mineral Resources China University of Geosciences Solid Earth Studies Laboratory Department of Geology University of Regina

U-Pb zircon age, geochemical, and Sr-Nd-Pb isotopic data of mafic dykes from eastern Shandong Province, eastern China is reported herein. Laser ablation inductively coupled plasma mass spectrometry （LA-ICP-mS） U-Pb zircon analyses of two samples from the investigated mafic dykes yield consistent ages ranging from 121.9 ma ± 0.47 ma to 122.9 ma ± 0.61 ma. The mafic dykes are characterized by high （87Sr/86Sr） i ranging from 0.7087 to 0.7089, low εNd（t） values ranging from -16.9 to -17.8, 206Pb/204Pb = 17.15 to 17.17, 207Pb/204Pb = 15.45 to 15.47, and 208Pb/204Pb = 37.59 to 37.68. Results from the current study suggest that the mafic dykes are derived from partial melting of ancient lithospheric mantle that was variably hybridized by melts derived from foundered lower crustal eclogite. The mafic dykes may have been generated through subsequent insignificant crystal fractionation and very minor crustal contamination during magma ascent. Combined with previous studies, the current findings provide new evidence that the intense lithospheric thinning beneath the eastern Shandong Province of eastern China occurred at ~120 ma, and that this condition was caused by the removal of the lower lithosphere （mantle and lower crust）.

关键词： Eastern China eastern Shandong Province foundering mafic dykes North China Craton

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Zinc, copper, and strontium isotopic variability in the Baiyangping Cu–Pb–Zn–Ag polymetallic ore field, Lanping Basin, Southwest China

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Acta Geochimica 2021年第4期40卷 557-574页

作者： Caixia Feng Shen Liu Guoxiang Chi Xianwu Bi Ruizhong Hu ian mcoulson State Key Laboratory of Continental Dynamics Department of GeologyNorthwest University229 Taibai RoadXi’an 710069China Departments of Geology University of Regina3737 Wascana ParkwayReginaSK S4S 0A2Canada Institute of Geochemistry Chinese Academy of Sciences99 Lincheng RoadGuiyang 550002China

The Baiyangping Cu-Ag polymetallic ore district is located in the northern part of the Lanping-Simao foreland fold belt,between the Jinshajiang-Ailaoshan and Lancangjiang faults,and the deposit can be divided into eastern and western ore *** upon microscope observation of ore minerals and analysis of zinc,copper,and strontium isotope composition,we conclude that:(1)the zinc isotopic compositions of sphalerite from the eastern and western ore belt of the Baiyangping polymetallic ore deposits are enriched in both the heavy(-0.09‰ to+0.15‰) and light(-0.19‰ to-0.01‰)zinc *** fractionation is likely the additional factor controlling the observed temporal and spatial variations in zinc isotopes in the two studied ore *** zinc isotopic composition in the Baiyangping polymetallic Pb-Zn deposits may have the same fractionation as that of magmatic-hydrothermal,VHmS,SEDEX,and mVT deposits,as demonstrated by geological and other geochemical evidence;(2) the range of δ^(65)Cu in massive tetrahedrite is from-0.06‰ to+0.12 ‰ that relates to the early stages of ore-formation,which are higher than that of venial chalcopyrite(from-0.72‰ to-0.07‰)formed at a late ore-forming stage in the western ore *** ore-forming stages and alteration or leaching processes are likely the main factors controlling the observed variations in copper isotopes in the western ore zone;(3) the ^(87)Sr/^(86)Sr value of hydrothermal calcite in eastern(0.7080-0.7093) and western(0.7085-0.7113) ore belt suggested that mineralization of early calcite,with^(87)Sr/^(86)Sr values much higher than in ancient Late Triassic seawater,may be related to recrystallization from a radiogenic Sr-rich or silicifying fluid,either from the strata that the ore-forming fluid flows through or from other fluids.

关键词： Zn-Cu-Sr isotopic variation Cu-Pb-Zn-Ag poly-metallic ore deposit Baiyangping Lanping Basin

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Zircon U-Pb geochronology,whole-rock geochemical,and Sr-Nd-Pb isotopic constraints on the timing and origin of Permian and Triassic mafic dykes from eastern North China Craton

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Acta Geochimica 2020年第6期39卷 862-886页

作者： Shen Liu Caixia Feng Yan Fan Xiaoqing Chen Yuhong Yang Huibo Zhao ian mcoulson State Key Laboratory of Continental Dynamics and Department of Geology Northwest UniversityXi'an 710069China College of Earth Sciences Jilin UniversityChangchun 130061China Solid Earth Studies Laboratory Department of GeologyUniversity of ReginaReginaCanada

This work reports an important episode of extensional,mafic magmatism that impacted the North China Craton(NCC)during the Permo-Triassic and influenced the evolution of this *** sampled 30 representative mafic dykes cropping out in eastern NCC,within the Hebei Province,*** zircon LA-ICP-mS U-Pb ages,geochemical,and Sr-Nd-Pb isotopic data for these mafic dykes identified them as typical dolerites formed between 211.9±1.3 and 263.9±2.6 *** mafic rocks fall into the alkaline and calc-alkaline *** are enriched in light rare earth elements,some large ion lithophile elements(e.g.,***,and Sr),K,and Pb,and depleted in Nb,Ta,and *** dykes have high initial 87Sr/86Sr ratios(0.7034-0.7178),negative eNd(t)values(—2.2 to—5.9),and relatively constant initial Pb isotopic ratios,that are EmI-like:(206Pb/204Pb)i=16.39-16.74,(207pb/204pb)j=15.22-15.24,and(208Pb/204Pb)i_=36.66-36.86,*** results indicate that the Hebei Province dolerites were likely derived from magma gen erated through low-medium degree partial melting(3.0-20%)of an EmI-like garnet-lherzolite mantle *** parental magmas fractionated olivine,clinopyroxene,and Ti-bearing phases with obvious crustal contamination during rapid ascent and dyke *** the possible influence of subduction of the Yangtze Plate has been excluded,we propose a model for the origin of the investigated mafic rocks,involving the Pennian collision between the Siberian Block and the *** mafic dykes of eastern NCC within Hebei Province formed during a period of crustal thinning in response to extension after the early Permian collision.

关键词： Permo-Triassic Dolerite Origin NCC Siberian block

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