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| 1 | Geological characteristics,metallogenic background,and genesis of the Tongyu VHMS copper deposit in the west part of the North Qinling,Shaanxi Province显示文摘The Tongyu volcanic-hosted massive sulfide(VHMS) copper deposit is located in the west part of the North Qinling(NQL),Shaanxi Province.Here we report geological features and trace elemental characteristics of ores,mineralized rocks,and volcanic host rocks of this deposit.We also conducted in situ zircon U-Pb and Lu-Hf LA-ICP-MS dating and lithogeochemical study of the Meigou granodiorite,which is intruded in the south of the Tongyu mining district.It is inferred that the volcanic host rocks of the Tongyu Cu deposit belong to calc-alkaline island arc volcanic rocks,and the volcanic host rocks and the ore-forming materials share common material sources.During subduction of the Paleo-Qinling oceanic slab at around 472 Ma,high oxygen-fugacity aqueous fluid released by dehydration reaction of the subducting slab rose into the mantle wedge,leached Cu and other metal elements,and triggered partial melting of the mantle wedge.Associated with the ore-forming materials,the arc calc-alkaline magmas erupted and formed the Tongyu VHMS deposit.The weighted average zircon U-Pb age of the Meigou granodiorite is 439.3±3 Ma,suggesting its genesis is associated with the subduction event of the Paleo-Qinling oceanic plate around 440 Ma.In terms of the granitoid's geochemical characteristics,the Mg#,Ni,and Cr contents are high.REE show strongly fractionated patterns with unobvious Eu anomalies.Sr contents are high while Y contents are low,resulting in high Sr/Y ratios.Two-stage zircon Hf model ages mostly range between 908 and 723 Ma,with εHf(t)>0.Therefore,we classify Meigou granodiorite as island arc granite with adakitic geochemical features.It was generated by interaction between mantle wedge and melt produced by partial melting of the subducted basaltic slab of the Paleo-Qinling Ocean.The Tongyu VHMS deposit was formed in the island arc tectonic setting during Ordovician-Silurian between 439.3±3 Ma and 472±11 Ma.The volcanic exhalation-sedimentation,which was contemporaneous with the submarine volcanics,produced the primary mineralization of the Tongyu Cu deposit.Afterward,the ore bodies and host rocks were reworked and overprinted intensively by structures corresponding with the overall collisional orogenic process of the Qinling Orogenic Belt during the Indosinian period.In contrast to classic VHMS deposits such as the Kuroko deposit in Japan,the Tongyu Cu deposit possesses the dual characteristics of island arc volcanic exhalation and sedimentation as well as structural reworking and overprinting.Therefore,the Tongyu VHMS Cu deposit is a volcanic exhalation and sedimentation-structural reworking and overprinting type deposit. | Ben Lee LaiMin Zhu GuoWei Zhang Bo Guo HuJun Gong AnPing Yao | 2010 | Science China Earth Sciences2010，53，10： | 5 |
| 2 | Zircon U-Pb Geochronology and Geochemical Characteristics of the Volcanic Host Rocks from the Tongyu VHMS Copper Deposit in the Western North Qinling Orogen and Their Geological Significance显示文摘Precise in situ zircon U-Pb dating and Lu–Hf isotopic measurement using an LA-ICP-MS system, whole-rock major and trace element geochemistry and Sr–Nd isotope geochemistry were conducted on the volcanic host rocks of the Tongyu copper deposit on the basis of further understanding of its geological characteristics. Three zircon samples from the volcanic host rocks yielded 206Pb/238 U weighted average ages ranging from 436±4 Ma to 440±5 Ma, which are statistically indistinguishable and coeval with the ca. 440 Ma northward subduction event of the Paleo-Qinling oceanic slab. The volcanic host rocks were products of magmatic differentiation that evolved from basalt to andesite to dacite to rhyolite, forming an integrated tholeiitic island arc volcanic rock suite. The primitive mantle-normalized trace element patterns for most samples show characteristics of island arc volcanic rocks, such as relative enrichment of LILE(e.g. Th, U, Pb and La) and depletion of HFSE(e.g. Nb, Ta, Ti, Zr and Hf). Discrimination diagrams of Ta/Yb vs Th/Yb, Ta vs Th, Yb vs Th/Ta, Ta/Hf vs Th/Hf, Hf/3 vs Th vs Nb/16, La vs La/Nb and Nb vs Nb/Th all suggest that both the volcanic host rocks from the Tongyu copper deposit and the volcanic rocks from the regional Xieyuguan Group were formed in an island arc environment related to subduction of an oceanic slab. Values of ISr(0.703457 to 0.708218) and εNd(t)(-2 to 5.8) indicate that the source materials of volcanic rocks from the Tongyu copper deposit and the Xieyuguan Group originated from the metasomatised mantle wedge with possible crustal material assimilation. Most of the volcanic rock samples show good agreement with the values of typical island arc volcanic rocks in the ISr-εNd(t) diagram. The involvement of crustal-derived material in the magma of the volcanic rocks from the Tongyu copper deposit was also reflected in the zircon εHf(t) values, which range from-3.08 to 10.7, and the existence of inherited ancient xenocrystic zircon cores(2616±39 Ma and 1297±22 Ma). The mineralization of the Tongyu copper deposit shows syn-volcanic characteristics such as layered orebodies interbedded with the volcanic rock strata, thus, the zircon U-Pb age of the volcanic host rocks can approximately represent the mineralization age of the Tongyu copper deposit. Both the Meigou pluton and the volcanic host rocks were formed during the ca. 440 Ma northward subduction of the Paleo-Qinling Ocean when high oxygen fugacity aqueous hydrothermal fluid released by dehydration of the slab and the overlying sediments fluxed into the mantle wedge, triggered partial melting of the mantle wedge, and activated and extracted Cu and other ore-forming elements. The magma and ore-bearing fluid upwelled and erupted, and consequently formed the island arc volcanic rock suite and the Tongyu VHMS-type copper deposit. | XIONG Xiao ZHU Laimin LI Ben ZHANG Guowei GONG Hujun ZHENG Jun JIANG Hang | 2015 | Acta Geologica Sinica(English Edition)2015，89，6： | 5 |
| 3 | Geology and Lead-Sulphur Isotope Compositions of the Tongyu Volcanic-Hosted Massive Sulphide Copper Deposit in the Western Part of the North Qinling Orogen, China显示文摘The Tongyu copper deposit, located in the western part of the North Qinling Orogen, China, is one of several volcanic-hosted massive sulphide(VHMS) deposits with industrial value and is also a typical example of mineralization related to the subduction and metallogenesis during the Caledonian orogeny. We conducted systematic lead-sulphur isotope geochemical analyses of the Tongyu deposit to understand the possible ore-forming material sources and tectonic settings. Twenty-six sulphide samples yielded clustered δ^(34)S_(CDT) values of 1.13‰-3.36‰, average 2.22‰, and show a tower-type distribution,implying that the sulphur of the Tongyu copper deposit mainly originated from a mantle source. The Pb isotope compositions of sulphides(^(206)Pb/^(204)Pb = 17.59225-18.56354, average 18.32020; ^(207)Pb/^(204)Pb =15.51770-15.69381, average 15.66217; ^(208)Pb/^(204)Pb= 37.99969-39.06953, average 38.52722) are close to the values of the volcanic host rocks(^(206)Pb/^(204)Pb= 18.10678-18.26293, average 18.21158; ^(207)Pb/^(204)Pb =15.63196-15.68188, average 15.65345; ^(208)Pb/^(204)Pb= 38.43676-38.56360, average 38.49171), thus consistent with the Pb in ores and volcanic host rocks having been derived from a common source that was island-arc Pb related to oceanic crust subduction. The northward subduction of the Palaeo-Qinling oceanic crust triggered dehydration of the slab, which generated a large amount of high-oxygen-fugacity aqueous hydrothermal fluid. The fluid rose into the mantle wedge, activated and extracted metallogenic material and promoted partial melting of the mantle wedge. The magma and ore-forming fluid welled up and precipitated, finally forming the Tongyu VHMS copper deposit. | GONG Hujun ZHU Laimin LI Ben XIONG Xiao DING Lele | 2017 | Acta Geologica Sinica(English Edition)2017，91，5： | 3 |
| 4 | Zircon U-Pb Ages of Quaternary Loess-Paleosol Sequences from the Luochuan Section:Implication for Sediment Provenance显示文摘Objective The sediment provenances of the thick Quaternary Loess-Paleosol sequences of the Chinese Loess Plateau can provide clues to the evolution of the paleoclimate and paleoenvironment in East Asia.Furthermore,based on the proposed sediment sources and transport routes,the evolution of the East Asian monsoon can be evaluated. | GONG Hujun XIE Wenbin WANG Jiading ZHANG Rui ZHANG Yunxiang YANG Lirong | 2017 | Acta Geologica Sinica(English Edition)2017，91，1： | 2 |
| 5 | Zircon U-Pb ages and Hf isotopic characteristics of the Dehe biotite monzonitic gneiss pluton in the North Qinling orogen and their geological significance显示文摘The Dehe granitic pluton intruded the Xiahe Group which is in the core complex of the North Qinling Orogenic Belt(NQOB).It shows gneissic bedding and possesses typical S-type granite minerals such as muscovite and garnet.LA-ICP-MS U-Pb isotopic dating of the Dehe granite yielded a weighted average age of 925±23 Ma which represents the emplacement age of the pluton.Most of the εHf(t) values are negative,and the two-stage model ages are consistent with the age of the Qinling Group.The isotope data show that the Dehe granite was formed in the following geological setting:in the syn-collision setting of the NQOB in the Neoproterozoic,crustal thickening induced partial melting of materials derived from the Qinling complex,and then the maga upwelled and intruded into the Xiahe Group.The formation of the Dehe S-type granite implied the occurrence of a convergent event in the QOB during the Neoproterozoic. | Wang, Fei Zhu, Laimin Li, Jiming Lee, Ben Gong, Hujun Yang, Tao Wang, Wei Xu, Ao | 2011 | Chinese Journal Of Geochemistry2011，30，2： | 1 |
| 6 | A New Model for Correlation between the Marine Benthic Oxygen Isotope and Red Clay Magnetic Susceptibility on the Chinese Loess Plateau显示文摘Objective Aeolian sediments on the Chinese Loess Plateau contain some of the best continental archives of palaeoclimate change in the Late Cenozoic.The consensus that alternating MS in loess-paleosols in China was due to the strengthening and weakening of the East Asian palaeomonsoon provides an excellent climate record when correlated with global ice volume.Significantly,new basal dates from the red clay underlying the loess-paleosol sequence indicate that wind-blown dust began to accumulate on the Chinese Loess Plateau at least | GONG Hujun ZHANG Rui ZHANG Yunxiang YUE Leping | 2017 | Acta Geologica Sinica(English Edition)2017，91，3： | 1 |
| 7 | Geochemistry of the Jinduicheng Mo-bearing porphyry and deposit, and its implications for the geodynamic setting in East Qinling, P.R. China显示文摘 | Laimin Zhu Guowei Zhang Bo Guo Ben Lee Hujun Gong Fei Wang | 2009 | Chemie der Erde - Geochemistry - Interdisciplinary Journal for Chemical Problems of the Geosciences and Geoecology2009，，2： | 1 |
| 8 | Fast example-based surface texture synthesis via discrete optimization显示文摘 | Jianwei Han Kun Zhou Li-Yi Wei Minmin Gong Hujun Bao Xinming Zhang Baining Guo | 2006 | The Visual Computer (-)2006，，9： | 1 |
| 9 | Paleogene-Neogene stratigraphic realm and tectonic-sedimentary evolution of the Qilian Mountains and their surrounding areas显示文摘The Cenozoic uplift of Qilian Mountains is critical to comprehend the uplift and extension of the Tibet Plateau as well as the formation of the first and second steps in China's topography. This study summarized dynamic stratigraphic realm comprehensively on the basis of stratigraphic correlation of different Cenozoic sedimentary basin regions of the Qilian Mountains and adjacent mountains. This facilitated the re-creation of the tectonic-sedimentary evolutionary process of the Qilian Mountains and their surrounding areas. The results indicate that during the Early Paleogene(Paleocene-Eocene), the Qilian Mountains were part of an uplift realm. During the Oligocene, Guide-Xining-Lanzhou-Linxia sag basin at the northern margin of the West Qinling Mountains came into being and was subjected to sedimentation. The Suli Basin located between the North and South Qilian paleo-uplifts began to form and undergo sedimentation. Intracontinental orogenic extrusion and basin detachment occurred at the Qilian Mountains during the Miocene, which caused successive uplifts of various mountains, including the Laji, South Qinghai,Jishi, Liupan, and South Shule Mountains. Until Pliocene, Qilian Mountains uplifted continuously and resulted in the shrink,extinction and being eroded of the basins, and aeolian red clay started to accumulate. | YANG LiRong LI JianXing YUE LePing WANG HongLiang GUO HuaiJun ZHU XiaoHui ZHU Tao DU Kai ZHANG Rui ZHANG YunXiang GONG HuJun | 2017 | Science China Earth Sciences2017，60，5： | 1 |
| 10 | Fast example-based surface texture synthesis via discrete optimization显示文摘 | Jianwei Han Kun Zhou Li-Yi Wei Minmin Gong Hujun Bao Xinming Zhang Baining Guo | 2006 | The Visual Computer (-)2006，，9： | 1 |
| 11 | Middle Pleistocene mammalian fauna of Shanyangzhai cave in Qinhuangdao area, China and its zoogeographical significance显示文摘The mammalian fauna with clear characteristics of transitional region has been found in the Shanyangzhai cave of the Qin-huangdao area where the three Chinese zoogeographical regions (the Northeast region, the North region and the Mengxin region) join. Abundant fossils mainly are small mammals. The fauna includes typical species derived from three zoogeographical regions and can be compared with the middle Pleistocene faunas found in both the Zhoukoudian (the North region) and the Jinniushan (the Northeast region) faunas. Of 53 kinds of mammals identified at the site, 38 kinds can be seen on the list of the middle Pleis-tocene Zhoukoudian and the Jinniushan faunas, of which 29 kinds are the same as those in the Zhoukoudian fauna and 25 are in the Jinniushan fauna, 7 in the Salawusu fauna and account for 76%, 66% and 18% of the total, respectively. It is suggested based on the consistence of the constitution of the fauna and its recent zoogeographic division that the three regions in north China could be initially formed during the middle Pleistocene. | ZHANG YunXiang LI YongXiang WANG Wei GONG HuJun | 2010 | Chinese Science Bulletin2010，55，1： | 0 |
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