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| 1 | The Origin and Tectonic Significance of the Volcanic Rocks of the Yeba Formation in the Gangdese Magmatic Belt, South Tibet显示文摘Zircon U-Pb geochronology, Hf isotope and whole-rock geochemistry were performed on the tuffs of the Yeba Formation in the Gangdese magmatic belt, South Tibet. The results are used to detail the age, source nature and tectonic processes that led to the formation of the Gangdese belt. Dating results indicate that the rhyolitic-andesitic tuffs were formed at 174–170 Ma. Positive and variable zircon ε_(Hf)(t) values of the rhyolitic tuffs reveal that the source was dominated by juvenile material, however, experienced crustal contamination. The basaltic tuffs have low HREEs, high contents of compatible elements(V and Cr) and no Eu anomaly. In contrast, the rhyolitic-andesitic tuffs show low compatible trace elements, depletion in Eu but enrichment in incompatible elements(Rb, Zr and Hf). According to the discrimination diagrams of P_2O_5-SiO_2 and Th-Rb, the rhyolitic-andesitic tuffs show a close affinity to Ⅰ-type granitoids. Moreover, these tuffs are marked by significant depletion in Nb, Ta and Ti, plotted in calc-alkaline field, and with the andesitic-rhyolitic tuffs falling into an active continental margin setting. We suggest that these tuffs of the Yeba Formation were probably generated in an active continental margin above the northward subduction of the Neo-Tethyan oceanic lithosphere. | Xuxuan Ma Zhiqin Xu Xijie Chen Joseph G.Meert Zhenyu He Fenghua Liang Yuanku Meng Shiwei Ma | 2017 | Journal of Earth Science2017，28，2： | 20 |
| 2 | Neoproterozoic–Early Paleozoic Tectonic Evolution of the South China Craton: New Insights from the Polyphase Deformation in the Southwestern Jiangnan Orogen显示文摘A >1500–km–long northeast–southwest trending Neoproterozoic metamorphic belt in the South China Craton(SCC) consists of subduction mélange and extensional basin deposits. This belt is present under an unconformity of Devonian–Carboniferous sediments. Tectonic evolution of the Neoproterozoic rocks is crucial to determining the geology of the SCC and further influences the reconstruction of the Rodinia supercontinent. A subduction mélange unit enclosed ca.1000–850–Ma mafic blocks, which defined a Neoproterozoic ocean that existed within the SCC, is exposed at the bottom of the Jiangnan Orogen(JO) and experienced at least two phases deformation. Combined with new(detrital) zircon U–Pb ages from metasandstones, as well as igneous rocks within the metamorphic belt, we restrict the strongly deformed subduction mélange as younger than the minimum detrital age ca. 835 Ma and older than the ca. 815 Ma intruded granite. Unconformably overlying the subduction mélange and the intruded granite, an intra–continental rift basin developed <800 Ma that involved abundant mantle inputs, such as mafic dikes. This stratum only experienced one main phase deformation. According to our white mica ^(40)Ar/^(30)Ar data and previously documented thermochronology, both the Neoproterozoic mélange and younger strata were exhumed by a 490–400–Ma crustal–scale positive flower structure. This orogenic event probably induced the thick–skinned structures and was accompanied by crustal thickening, metamorphism and magmatism and led to the closure of the pre–existing rift basin. Integrating previously published data and our new results, we agree that the SCC was located on the periphery of the Rodinia supercontinent from the Neoproterozic until the Ordovician. Furthermore, we prefer that the convergence and dispersal of the SCC were primarily controlled by oceanic subduction forces that occurred within or periphery of the SCC. | ZHAO Zhongbao XU Zhiqin MA Xuxuan LIANG Fenghua GUO Peng | 2018 | Acta Geologica Sinica(English Edition)2018，92，5： | 11 |
| 3 | Detrital Zircon U-Pb Geochronologyof Sinian–Cambrian Strata in the Eastern Guangxi Area, China显示文摘The Eastern Guangxi area locates in the southwestern part of the transition zone between Yangtze and Cathaysia blocks, which is an important region because the boundary between two blocks probablycrosses there. We determined LA-ICPMS U-Pb ages for detrital zircons extracted from three sandstone samples in the Sinian-Cambrian strata in this region. The resulting ages are in the range of the Archeozoic and Neoproterozoic, with three notable concentrates at 991 Ma, 974 Ma, and 964 Ma, all of which are coeval to the Grenvillian magmatic activity. The new age distribution is similar to the data reported in the Precambrian strata of the adjacent southwestern Cathaysia Block, suggesting that most of our detrital zircons are likely derived from the Cathaysia Block. Combined with others' research, we are more inclined to accept the opinion that there was not an ocean basin between the two blocks during the Sinian-Cambrian period in Eastern Guangxi area if the timing of collision is the Early Neoproterzoic. But if the timing of collision is the Early Paleozoic, we conclude that Luzhai uplift(i.e., the uplift between Guilin-Yongfu faultand Lipu fault) beyond the west of Dayaoshan regoin might be one part of southwestern sedimentation boundary of Cathaysia Block and Yangtze Block. We also get a few of detrital zircons with ages of ~590 Ma which probably sourced from northeastern Gondwana and 13 detrital zircons with over 3 000 Ma U-Pb ages which record the early formation of the earth. | Ruxin Ding Heping Zou Kyoungwon Min Feng Yin Xiaodong Du Xuxuan Ma Zhangxin Su Wenjie Shen | 2017 | Journal of Earth Science2017，28，2： | 5 |
| 4 | Cost-Effective Control of Ground-Level Ozone Pollution in and around Beijing显示文摘Ground level ozone pollution has become a significant air pollution problem in Beijing. Because of the complex way in which ozone is formed, it is difficult for policy makers to identify optimal control options on a cost-effective basis. This paper identi-fies and assesses a range of options for addressing this problem. We apply the Ambient Least Cost Model and compare the eco-nomic costs of control options, then recommend the most effective sequence to realize pollution control at the lowest cost. The study finds that installing of Stage II gasoline vapor recovery system at Beijing's 1446 gasoline stations would be the most cost-effective option. Overall, options to reduce ozone pollution by cutting ve-hicular emissions are much more cost-effective than options to 'clean up' coal-fired power plants. | Xie Xuxuan Zhang Shiqiu Xu Jianhua Wu Dan Zhu Tong | 2012 | Chinese Journal of Population,Resources and Environment2012，10，2： | 5 |
| 5 | Thermoelectric thin films:Promising strategies and related mechanism on boosting energy conversion performance显示文摘Thermoelectrics can be capable of direct and reversible conversion between heat and electricity.Low dimensional thermoelectric materials,especially two dimensional(2D)thin films,have been considered as a breakthrough to decouple the correlations between electronic and thermal transport,contributing to the optimization of thermoelectric performance.During the past few decades,some effective strategies combined with physical concepts like quantum confinement effect,energy filtering effect,band structure tuning and interface engineering are introduced to design high performance thermoelectrics.Having a thorough understanding the underlyingmechanisms is essential to develop thermoelectric materials.Here,our review summarizes the major strategies that can be utilized in thermoelectric thin films,including fabrication of superlattice structure,formation of two-dimensional electron gas(2DEG)system,orientation regulation,strain engineering and magnetic manipulation,from the aspects of deep mechanisms analyses,recent progress and prospects,inspiring significant improvement of thermoelectric properties. | Xuxuan Chen Zhifang Zhou Yuan-Hua Lin Cewen Nan | 2020 | Journal of Materiomics2020，6，3： | 3 |
| 6 | Modeling and harmonic optimization of a two-stage magnetically controlled reactor for an arc suppression coil显示文摘 | CHEN Xuxuan CHEN Baichao TIAN Cuihua | 2012 | IEEE Transaction on Industrial Electronics2012，59，7： | 1 |
| 7 | Modeling and harmonic optimization of a two-stage saturable magnetically controlled reactor for an arc suppression coil显示文摘 | Chen Xuxuan Chen Baichao Tian Cuihua | 2012 | IEEE Transactions on Industrial Electronics2012，59，7： | 1 |
| 8 | Modeling and harmonic optimization of a two-stage saturable magnetically controlled reactor for an arc suppression coil显示文摘 | Chen Xuxuan Chen Baichao Tian Cuihua | 2012 | IEEE Transaction on Industrial Electronics2012，59，7： | 1 |
| 9 | Geochemistry and ori gins of natural gases in the Yinggehai and Qiongdongnan basins,offshore South China Sea显示文摘 | Huang Baojia Xiao Xianming Li Xuxuan | 2003 | Organic Geochemistry2003，，34： | 1 |
| 10 | Geochemistry and origins of natural gases in the Yinggehai and Qiongdongnan basins, offshore South China Sea显示文摘 | Baojia Huang Xianming Xiao Xuxuan Li | 2003 | Organic Geochemistry2003，，7： | 1 |
| 11 | Modeling and harmonic optimization of a two-stage saturable magnetically controlled reactor for an arc suppression coil显示文摘 | CHEN Xuxuan CHEN Baichao TIAN Cuihua | 2012 | IEEE Transac-tions on Industrial Electronics2012，59，7： | 1 |
| 12 | Geochemistryand origins of natural gases in the Yinggehai and Qiong-dongnan Basins,offshore South China Sea显示文摘 | Huang Baojia Xiao Xianming Li Xuxuan | 2003 | Organic Ge-ochemistry2003，34，7： | 1 |
| 13 | Geochemistry and or-igins of natural gases in the Yinggehai and Qiongdongnan basins,offshore South China Sea显示文摘 | HUANG Baojia XIAO Xianming LI Xuxuan | 2003 | Organic Geochemistry2003，34，7： | 1 |
| 14 | Oil families and their source rocks in the Weixinan Sub basin, Beibuwan ba sin,South China Sea 显示文摘 | HUANG B J XIAO Xianming LI Xuxuan | 2011 | Organic Geochemistry2011，42，： | 1 |
| 15 | Geochemistry and origins of natural gases in the Yinggehai and Qiongdongnan basins offshore South China Sea显示文摘 | HUANG BAOJIA XIAO XIANMING LI XUXUAN | 2003 | Org Geochem2003，34，7： | 1 |
| 16 | Late Triassic Intraoceanic Arc Aystem within Neotethys: Evidence from Cumulate Hornblende Gabbro in Gangdese Belt, South Tibet显示文摘The Neotethys plays an important role in shaping the Gangdese magmatic belt,southern Tibet.However,the initial time of spreading and subduction of the Neotethys remains contentious.In this study,a suite of late Triassic cumulate hornblende gabbro was identified in the southern margin of the Gangdese magmatic belt.The gabbro exhibits cumulate structure,with hornblende and plagioclase as the primary mineral phases.Isotopic data indicate a hydrous magma source derived from a depleted mantle wedge that has been modified by slab dehydration.Geochemical discriminations suggest that the gabbro was formed in an intraoceanic arc setting,with crystallization ages of ca.220-213 Ma.Hornblende,hornblendelagioclase and ilmenite thermometers reveal that the crystallization temperature of 900-750°C for the gabbro.Hornblende and hornblende-plagioclase geobarometers yield an emplacement depth at ca.14.5-19.5 km.This gabbro constitutes a line of evidence for an intraoceanic arc magmatism that is coeval with the counterparts in the southern Turkey,revealing an intraoceanic subduction system within the Neotethys from west to east in the Late Triassic and that the oceanization of the Neotethys was much earlier than previous expectation. | MA Xuxuan YI Zhiyu XU Zhiqin | 2017 | Acta Geologica Sinica(English Edition)2017，91，S1： | 0 |
| 17 | Positioning the Southern Margin of Asia Prior to Its Collision with India: Paleomagnetic Constraints from Late Cretaceous Dykes in Gangdise Belt显示文摘The pre-collisional southern margin of Asia can be restored using paleomagnetic data from late Cretaceous rocks from the Lhasa terrane.However,the available data are based either on the red beds or on the intercalated thin layers of lava flows,both of which had been involved in strongly folding.Recent studies show clear evidence for the possibility of serious overprint hence the data could not be reliably used for tectonic interpretation.We report paleomagnetic data from diorite dykes and the grano-diorite country rock in the Gandise belt near the city of Lhasa.U–Pb isotopic dating indicates the intrusive rocks have an age of^82–86 Ma.Fifteen sites yield acceptable Ch RM directions which pass a reversal test.SEM and light microscope observations show primaryintergrowth relationship between magnetite and other minerals within the thin sections.AMS measurement defines a primary magma flow fabric for the intruded dykes and the country rocks.All the characteristics support that the Ch RMs are primary.The paleomagnetic pole calculated from the remanence of the dykes and the country rocks yields a paleolatitude of^14°N which provide a reliable constraint for the southern margin of Asia near Lhasa.Furthermore,the recorded declination shows significant counterclockwise rotation of^20°for the sampling location relative to the north.In consideration of the strike and tectonic setting of the dykes,the strike of the southern margin of Asia is restored which is compatible with the hypothesis of a quasi-linear margin of Eurasia prior to its collision with India. | YI Zhiyu MA Xuxuan | 2017 | Acta Geologica Sinica(English Edition)2017，91，S1： | 0 |
| 18 | Combining Stated Preference and Revealed Preference Methods for the Valuation of Non-market Goods显示文摘In this paper,we introduce the combining stated preference and revealed preference methods which is the state-ofthe-art method for the valuation of non-market goods.Revealed preference methods and stated preference (SP) methods have both been applied by economists in valuing non-market goods;however both methods have inherent weaknesses.In order to exploit the strengths of the various approaches while minimizing their weaknesses,combining the two methods has become an important methodological option.Up to now,a growing number of literatures of studying combing the two types of data have evolved,and researchers developed three types of models to estimate combining revealed preference and stated preference data in academic fields:discrete choice model,continuous choice model and mixed choice model.Combining stated and revealed preference methods have been developed fast especially in the transport study field in which ideas could also be leant for environmental economic studies. | Zhang Haipeng Xie Xuxuan | 2012 | Chinese Journal of Population,Resources and Environment2012，10，4： | 0 |
| 19 | A Compilation of New and Existing Thermochronology Data Concerning the Lhasa Terrane Combined with a Geological Synthesis of the Area显示文摘The history and geodynamic mechanisms of Cenozoic exhumation and denudation of the Lhasa terrane(LT),southern Tibetan Plateau, remain poorly constrained. Most previous studies investigating the exhumation of the LT have relied on extrapolating interpretations based on a few well-studied but small areas, which inevitably introduce bias. Here,our compilation of new and published thermochronologic ages are plotted against latitude, longitude, and elevation, to illustrate the distribution of cooling ages across broad regions of the LT. Primary results reveal that(1) the north LT experienced significant exhumation during 80–40 Ma;(2) compared with north LT, exhumation and erosion in the south LT continued after ~40 Ma;and(3) N–S striking rifting, E–W striking river incision, and thrusts led to continued local denudation of the south LT between 20–5 Ma. | ZHAO Zhongbao LI Chao MA Xuxuan LI Haibing | 2022 | Acta Geologica Sinica(English Edition)2022，96，5： | 0 |
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