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| 1 | New eolian red clay sequence on the western Chinese Loess Plateau linked to onset of Asian desertification about 25 Ma ago显示文摘The expansion of inland Asia deserts has considerably influenced the environmental, social and economic activities in Asia. Aridification of inland Asia, especially timing of the initiation of Asian desertification, is a contentious topic in paleoclimatology. Late Cenozoic eolian loess-red clay sequences on the Chinese Loess Plateau, which possess abundant paleoclimatic and paleo-environmental information, can be regarded as an indicator of inland Asia desertification. Here we present a detailed magnetostratigraphic investigation of a new red clay sequence about 654 m in Zhuanglang located at the western Chinese Loess Plateau. Sedimentological, geochemical, mineralogical, and quartz morphological lines of evidence show that the red clay is of eolian origin. Magnetostratigraphic correlations indicate that this core sequence spans from 25.6 to 4.8 Ma, and typical eolian red clay appears as early as 25 Ma. This extends the lower limit of the red clay on the Chinese Loess Plateau from the previously thought early Miocene back into the late Oligocene. This new red clay record further implies that the inland Asia desertification was initiated at least by the late Oligocene. This sequence provides a unique high-resolution geological record for understanding the inland Asia desertification process since the late Oligocene. | QIANG XiaoKe AN ZhiSheng SONG YouGui CHANG Hong SUN YouBin LIU WeiGuo AO Hong DONG JiBao FU ChaoFeng WU Feng LU FengYan CAI YanJun ZHOU WeiJian CAO JunJi XU XinWen AI Li | 2011 | Science China Earth Sciences2011，54，1： | 73 |
| 2 | Magnetostratigraphy of Late Tertiary sediments from the Chinese Loess Plateau and its paleoclimatic significance显示文摘The Late Tertiary red clay/bed sediments underlying the Quaternary loess-paleosol in the Chinese Loess Plateau possesses high-resolution paleoclimatic changes related to the uplift of the Tibetan Plateau. Magnetostratigra-phy and susceptibility measurements are discussed in this paper. The paleomagnetic results show that the red clay/bed began to accumulate at about 8.1 Ma, which represents the oldest Late Tertiary deposit continuously in the central Loess Plateau. The magnetic susceptibility curves show stepwise increases since the initiation of red clay, superimposed on several peaks. Moreover, the magnetic susceptibility increased abruptly since 3.8 Ma, which probably indicates the inception of the modern East Asia monsoon system. Between 3.8 and 2.6 Ma, the stepwise increases of susceptibility may imply progressively intensified East Asia summer monsoon activity related with the stepwise uplift process of the Tibetan Plateau. | SONG Yougui FANG Xiaomin MASAYUKI Torii NAOTO Ishikawa LI Jijun AN Zhisheng | 2001 | Chinese Science Bulletin2001，46，S1： | 9 |
| 3 | Development of a pediment on western slopes of Liupan Mountain related to the Neotectonic Uplift显示文摘The late Cenozoic uplift of Qinghai-Xizang Plateau plays an important role in adjacent geomorphic evolution and depositional environments. Liupan Mountain, located at the northeast margin of Qinghai-Xizang Plateau, has different landforms on the east and west sides. Recently, a pediment, which lies above the highest terrace of the Yellow River at the northeast edge of Longzhong Basin, has been described. The paleomagnetic measurements indicate that the pediment had developed at least 1.8 MaBP and its age is in accordance with that of the peneplains near Lanzhou and Linxia, in the southwest of Longzhong Basin. The results suggest that the Longzhong Basin lying to the west of Liupan Mountain had been subject to erosion and developed an extensive pediment; this pediment is named the Gansu Period Peneplain. It also indicates that Qinghai-Xizang Plateau and Liupan Mountain were uplifted strongly at that time, which caused not only the end of pediplanation but also Yellow River appearance and loess | YANG Dong FANG Xiaomin SONG Yougui LU Lianqing LI Jijun | 2001 | Chinese Science Bulletin2001，46，S1： | 7 |
| 4 | Late Cretaceous-Cenozoic Exhumation History of the L(u|¨)liang Mountains,North China Craton:Constraint from Fission-track Thermochronology显示文摘The Liiliang Mountains,located in the North China Craton,is a relatively stable block,but it has experienced uplift and denudation since the late Mesozoic.We hence aim to explore its time and rate of the exhumation by the fission-track method.The results show that,no matter what type rocks are,the pooled ages of zircon and apatite fission-track range from 60.0 to 93.7 Ma and 28.6 to 43.3 Ma,respectively;all of the apatite fission-track length distributions are unimodal and yield a mean length of~13μm;and the thermal history modeling results based on apatite fission-track data indicate that the time-temperature paths exhibit similar patterns and the cooling has been accelerated for each sample since the Pliocene(c.5 Ma).Therefore,we can conclude that a successive cooling,probably involving two slow(during c.75-35Ma and 35-5Ma) and one rapid(during c.5 Ma-0 Ma) cooling,has occurred through the exhumation of the Liiliang Mountains since the late Cretaceous.The maximum exhumation is more than 5 km under a steady-state geothermal gradient of 35℃/km.Combined with the tectonic setting,this exhumation may be the resultant effect from the surrounding plate interactions,and it has been accelerated since c.5 Ma predominantly due to the India-Eurasia collision. | LI Xiaoming SONG Yougui | 2010 | Acta Geologica Sinica(English Edition)2010，84，2： | 4 |
| 5 | Clay mineral records of the Erlangjian drill core sediments from the Lake Qinghai Basin, China显示文摘Located at the northeastern margin of the Qinghai-Tibet Plateau(QTP) in the Asian interior, the Lake Qinghai is sensitive to environmental change and thus an outstanding site for studying paleoenvironmental changes. Thick deposits in the Lake Qinghai provide important geological archives for obtaining high-resolution records of continental environmental history. The longest drilling core obtained from the Lake Qinghai, named Erlangjian(ELJ), reached about 1109 m and was investigated to determine its clay mineral assemblage and grain size distributions. Clay mineralogical proxies, including type, composition, and their ratios, as well as the illite crystallinity(KI) and chemical index(CI), in combination with grain size data, were used for reconstructing the history of paleoenvironmental evolution since the late Miocene in the Lake Qinghai Basin. The clay mineral records indicate that the clay mainly comprise detritus originating from peripheral material and has experienced little or no diagenesis. The proportion of authigenic origin was minor. Illite was the most abundant clay mineral, followed by chlorite, kaolinite, and smectite. Variations of clay mineral indexes reflect the cooling and drying trends in the Lake Qinghai region, and the grain size distribution is coincided with the clay minerals indexes. The paleoclimatic evolution of the Lake Qinghai Basin since the late Miocene can be divided into five intervals. The climate was relatively warm and wet in the early of late Miocene, then long-term trends in climate change character display cooling and drying; later in the late Miocene until early Pliocene the climate was in a short relatively warm and humid period; since then the climate was relatively colder and drier. These results also suggest multiple tectonic uplift events in the northeastern QTP. | ZENG MengXiu SONG YouGui AN ZhiSheng CHANG Hong LI Yue | 2014 | Science China Earth Sciences2014，57，8： | 4 |
| 6 | Magnetic properties of Jiaxian red clay sequences from northern Chinese Loess Plateau and its paleoclimatic significance显示文摘Detailed rock magnetism investigation of the Jiaxian red clay sequences indicated that there are common magnetic mineralogy properties in red clay and loess-paleosol sequences from the Chinese Loess Plateau as well as the marked properties of themselves, magnetic min-erals mainly with magnetite, maghemite, hematite, and possibly limonite/goethite contributing to the magnetic behavior. Meanwhile, it is found that the strong paleosol in red clay sequences has a lower coercivity and higher content of ultra-fine ferrimagnetic grains than that of the weak pa-leosol, which is similar to loess and paleosol in upper Wucheng Loess sequences, and indicates that humid conditions and relatively strong pedogenesis play a significant role in the increase of ultra-fine magnetic minerals and transformation of the magnetic minerals. This suggests that, like Quaternary loess-paleosols, the change of characteristics of paleoclimatic conditions of the late Tertiary red clay deposits is fluctuant. In addition, the results of magnetic hysteresis properties show that the applied saturated field for samples from the Jiaxian red clay sequences is higher than that of the samples from eastern and southern Chinese Loess Plateau. It is obviously shown that there exist more hard magnetic minerals and relatively weak biochemical processes in the Jiaxian red clay sequences on northern Chinese Loess Plateau. We conclude that the paleocli-matic environment is different between northern and eastern/southern Chinese Loess Plateau, and it should be more arid in northern Chinese Loess Plateau. | QIANG Xiaoke, AN Zhisheng, LI Huamei, CHANG Hong & SONG Yougui 1. SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China 2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China | 2005 | Science China Earth Sciences2005，48，8： | 4 |
| 7 | Red Clay Sediment in the Central Chinese Loess Plateau and Its Implication for the Uplift of the Tibetan Plateau显示文摘The widely distributed red clay sediment underlying the Chinese Loess Plateau truly records the Neogene environmental evolution, and its genesis and development are intrinsically related to the uplift processes of the Tibetan Plateau and the evolution of East Asia monsoon system. In this paper, a detailed magnetostratigraphy of a loess-red clay section (107°13′E, 35°02′N) from the central Loess Plateau is reported. The loess-red clay sequence is composed of 175 m Quaternary loess-paleosol sequence and 128 m Neogene red clay sediments. Based on the correlation with the standard geomagnetic polarity time scale, the paleomagnetic results indicate that the age of Chaona red clay sequence extends to 8.1Ma, which is the older red clay deposition in the central Chinese Loess Plateau. The commencement of red clay at ~8.1 Ma may imply that the Ordos planation surface was broken by the movement of the Haiyuan-Liupanshan Faults, which was related to the uplift of the Tibetan Plateau induced by the collision of India Plate and Eurasian Plate. And the western part adjacent to the Tibetan Plateau was uplifted to form the embryo of the Liupan Shan (Mts.) and the eastern part was down-faulted to receive red clay deposition. We link this faulting to an initial uplift of the Tibetan Plateau. The undulating nature of the broken Ordos planation surface may explain the chronological differences and depth discrepancies among various cross-sections of red clay. | SONG Yougui LI Jijun FANG Xiaomin XIA Fei DONG Hongmei | 2005 | Journal of Mountain Science2005，2，2： | 2 |
| 8 | Aeolian dust dynamics in the Fergana Valley, Central Asia, since -30 ka inferred from loess deposits显示文摘Knowledge of the interactions among atmospheric dynamics,dust emissions and climate system is essential to understand the physical mechanisms for the dust lifecycle,their role in loess formation as well as the predictions of future dust concentration.However,these issues still remain relatively poorly known in Central Asia(CA).The extensive loess deposits on the CA pediments provide a promising archive to explore atmospheric dust dynamics and climatic conditions in the past and their association with loess formation.This study investigates the granulometric and magnetic properties of a loess section(named Osh section)in the Fergana Valley,which provides a sensitive record of atmospheric dust dynamics since 30 ka based on radiometric(AMS ^(14)C)dating.The frequency-dependent magnetic susceptibility(χfd)and the mean grain size are used to reconstruct the broadscale effective moisture and summer atmospheric dynamics pattern in CA,respectively.The results show that the precession forcing exerts a huge influence on the wind-regime variabilities in CA,but with different physical processes under the impact of the Northern Hemisphere ice sheet(NHIS)before and after 15 ka.The origin of the sedimentation rate variations in the Osh loess is also linked to the NHIS-modulated changes of the atmospheric circulation patterns.Either the strengthened westerlies or the increased surface roughness from higher vegetation cover in loess-deposition areas have significantly accelerated the loess accumulation.As a result,these complicated influence factors of sedimentation rate change in the Osh loess section,especially during the Holocene epoch,may hamper accessibility of the authentic dust emission flux and atmospheric dust concentration in CA. | Yue Li Yougui Song Dimitris G.Kaskaoutis Jinbo Zan Rustam Orozbaev Liangcheng Tan Xiuling Chen | 2021 | Geoscience Frontiers2021，12，5： | 1 |
| 9 | Age Assignment of the Lycoptera- bearing Bed显示文摘In the Yanliao area, the occurrence of the Nestoria-Keratestheria fauna and the Eoparacypris- Luanpingella-Darwinula assemblage in the Dabeigou Formation s.s., a Rb-Sr isochron age of 145.2 Ma for the Baiqi Formation and a complete stratigraphic sequence-all this proves that the Lycoptera-bearing bed overlies the Upper Jurassic. The Jehol fauna comprises the primitive Trigonioidids fauna, Eosestheria fauna, Lycoptera fauna et al., and their own laws of evolution expound that they belong to Cretaceous faunas. The associations of Eosestheria with Yanjiestheria, Lycoptera with Eosestheria, and Kuntulunia with Yanjiestheria as well as the occurrence of early angiosperms and sporo - pollen in the Fuxin Formation and its equivalents also demonstrate that the Lycoptera-bearing, bed should be assigned to the Cretaceous. The confirmation of the existence of Aucellina in the Jixi Group and the correlation of Trigonioidids and Cypridids with those in the equivalent strata of Japan and Western Europe have also | Li Peixian, Su Deying, Li Yougui and Yu JingxianInstitute of Geology, Chinese Academy of Geological Sciences, Beijing | 1994 | Acta Geologica Sinica(English Edition)1994，68，3： | 1 |
| 10 | North Atlantic Abrupt Climate Signals during the Last Glacial Period in Central Asia:Evidences from Aeolian Loess Sediments显示文摘Objective Climate fluctuations over suborbital or millennial timescale display significant instability during the last glacial period,which are often superimposed upon the orbital periodicity.They triggered some abrupt climate events,such as the Dansgarrd/Oeschger(D-O)events recorded in the Greenland ice cores and the Heinrich(H) | SONG Yougui LI Yue LI Yun AN Zhisheng CHENG Liangqing SUN Huanyu Rustam OROZBAEV | 2017 | Acta Geologica Sinica(English Edition)2017，91，5： | 1 |
| 11 | An investigation of new barium phosphate chemical conversion coating on AZ31 magnesium alloy显示文摘 | Yougui Chen Ben Li Luan Guang-Ling Song Qi Yang David M. Kingston Farid Bensebaa | 2012 | Surface & Coatings Technology2012，，： | 1 |
| 12 | Herbicidal Activities of Eupatorium adenophorum Extracts by 3 Extraction Methods显示文摘[Objective] The paper was to screen the better extraction method for herbicidal active substances of Eupatorium adenophorum. [Method] Three common extraction methods, Soxhlet extraction, ultrasonic extraction and conventional extraction method, were used to prepare E. adenophorum extracts, and the herbicidal activity of E. adenophorum extracts extracted by 3 methods was studied by seed germination method. [Result] The extraction rate of Soxhlet extraction was the highest of (22.54±0.48)%, and the herbicidal activities of E. adenophorum extracted by Soxhlet extraction was relatively stronger. [Conclusion] Soxhlet extraction was the better extraction method for herbicidal active substances of E. adenophorum. | Yougui ZHA Yongqing LI Liming FAN Min YE Chun XIAO Jing WANG | 2012 | Plant Diseases and Pests2012，3，2： | 1 |
| 13 | A corn hined luminescence and radiocarbon dating study of the Ili lo- ess, Central Asia显示文摘 | Song Yougui Li Chuangxiang Zhao Jingdong | 2012 | Quaternary Geochronology2012，10，： | 1 |
| 14 | Simultaneous determination of copper, Zinc, Iron in erythrocytes by flame AAS显示文摘 | LI Yougui Zhuo Jigui | 1988 | Anal Abstr1988，50，3： | 1 |
| 15 | Preliminary Studies of Speleothem in Central Asia显示文摘Objective The Westerlies is important in linking the Northern high latitude,North Atlantic and East Asian monsoon.The location and intensity of the Westerly jet can not only control the climate of central Asia(including northwest arid China),but also significantly influence the climate of the East Asian monsoon region.However,it | TAN Liangcheng SONG Yougui CAI Yanjun AN Zhisheng Rustam OROZBAEV Yunus MAMADJANOV Lawrence R.EDWARDS CHENG Hai LI Dong LI Yue | 2016 | Acta Geologica Sinica(English Edition)2016，90，6： | 0 |
| 16 | Dust transport information and paleoclimatic changes revealed by the loess in Ranwu,south-eastern Xizang显示文摘The loess accumulation process has great potential to record patterns of atmospheric circulation change,paleoclimate,and paleoenvironmental evolution.South-eastern Xizang is a climatically sensitive region and here,we analyze a loess profile at Ranwu in order to explore the processes and interactions of dust transport and paleoclimate evolution in the region.Based on parametric grain size end-member analysis,optically stimulated luminescence(OSL)dating,and environmental proxies we show that the Ranwu loess profile comprises five end members(EMs).EM1 represents the fine silt fraction transported by high-altitude westerly winds over long distances;EM2 represents the medium silt fraction accumulated by glacier winds;EM3 is the coarse silt fraction transported by local dust storms under the action of strong glacier winds;EM4 represents the very fine sand fraction transported by strong local dust storms,different wind strengths controls the relative proportion of EM3 and EM4 over time.EM5 is the coarse sand fraction formed from the product of strong weathering of gravels.OSL dating shows loess sedimentation at Ranwu started around 11.16 ka.The prevailing climate was generally warm and wet between 11.6 and 4.2 ka,with four cooling events at 10.50,9.18,7.85,and 6.37 ka.Extensive paleosol development between 8.2 and 4.2 ka,a change to dry and cold climate conditions was favorable for loess formation after 4.2 ka.The palaeoenvironmental changes and abrupt climate events recorded in the Ranwu loess sequence are consistent with Holocene global environmental changes. | Meihui PAN Huimin ZHAO Anna YANG Yougui CHEN Chenlu LI | 2023 | Frontiers of Earth Science2023，17，4： | 0 |
| 17 | Successive magnetic ordering in two Co^(Ⅱ)-ladder metal-organic frameworks显示文摘Metal-organic frameworks showing successive magnetic ordering are far less common than inorganic compounds.Here,we report two metal-organic frameworks[Co^Ⅱ(ox)(bphy)·0.1(DMF)·0.1(Me OH)]n(1)and[Co3^Ⅱ(ox)3(bphy)2(DMF)2]n(2)comprised of zigzag and necklace Co^Ⅱ-ladders,respectively.Together with a previously reported compound[Co^Ⅱ(ox)(bphy)·0.2(DMF)]n(3)consisting of spiraling zigzag Co^Ⅱ-ladders,these three compounds provide a good system for comparative structural and magnetic studies.Comprehensive magnetic analysis reveals that the three compounds undergo long-range magnetic ordering at^2.6 K but exhibit vastly different short-range magnetic correlations:compound 1 shows short-range spin-canted antiferromagnetism ordering at^14.0 K;compound 2 demonstrates successive short-range antiferromagnetism ordering at^15.5and^12.6 K;compound 3 shows slow magnetic relaxation with Tb≈4.6 K.These results demonstrate long-range magnetic ordering is readily accessible in the frameworks of ox^2-bridging Co^Ⅱ-ladders linked by bphy,where short-range magnetic correlations can be systematicly tuned by the Co^Ⅱ-ladder structures. | Zhu Zhuo Guoling Li Chenglin Shu Wei Wang Caiping Liu Mingyan Wu Yougui Huang Maochun Hong | 2021 | Science China Chemistry2021，64，1： | 0 |
| 18 | Effect of an integrated mangrove-aquaculture system on aquacultural health显示文摘Mangroves are unique intertidal halophyte formations growing in sheltered tropical and subtropical coastal areas.Due to the increasing population and economic development,mangroves have faced degrada-tion and loss,which has been mainly caused by land conversion into aquaculture ponds in Asia.In the past several decades,the rapid growth of aquaculture has induced water pollution.Using mangroves for effluent treatment from coastal aquaculture ponds could be a suitable approach for wastewater treatment and healthy aquaculture development.An Integrated Mangrove-Aquaculture System(IMAS)was established to test whether the idea of a mangrove in situ treatment for aquaculture wastewater is feasible.The monocultures of three mangroves,Sonneratia caseolaris,Kandelia obo-vata,and Aegiceras corniculatum were established with area proportions of 45%,30%,or 15%,respectively.One control pond without mangroves was also set up.The results indicated that the mangroves had different toler-abilities to long-term inundation.The aquaculture ponds had different fishery yields,considering the mangrove species and area proportions.The water quality of most of the experimental ponds was better than the control pond,except for the planted Sonneratia.It is concluded that mangroves can reduce the concentration of dissolved inorganic nitrogen and phosphate,buffer the pH value and increase the concertration of dissolved oxygen in aqua-culture water bodies effectively.It is suggested to use 15%of the Aegiceras corniculatum area to conduct in situ purification of aquaculture wastewater and to enhance aquaculture production. | Yisheng PENG Xulin LI Kalan WU Yougui PENG Guizhu CHEN | 2009 | Frontiers in Biology2009，4，4： | 0 |
| 19 | A cobalt redox switch driving alcohol dehydrogenation by redox coupled molecular swing显示文摘Developing redox switches that not only perform specific mechanical movements but also drive important chemical reactions is important but a great challenge.Herein,we report a redox pair of cobalt species(Co^(Ⅲ)/Co^(Ⅱ))that switches through photo-dehydrogenation of alcohol and hydrogenation of azo-ligand.The cobalt species is equipped with a flexible azo-ligand containing two bulky planar substituents.A planar oxidated sate(Co^(Ⅲ)species)can be photo-reduced to a saddle-like reduced state(Co^(Ⅱ))with alcohol molecules as electron donors,and in turn the Co^(Ⅲ)species can be recovered with azo-ligand as oxidant under acidic surrounding.Both the redox states of the pair are isolated and characterized by single crystal X-ray diffraction.In the switching cycle,alcohol is oxidized to aldehyde by azo-ligand through proton coupled electron transfer and the cobalt complex acts as a redox catalyst.These results provide important insights into alcohol dehydrogenation catalyzed by redox complexes. | Guoling Li Yang Liu Wei Wang Zhu Zhuo Yougui Huang | 2023 | Chinese Chemical Letters2023，34，6： | 0 |
| 20 | Cyclic-acyclic monomers metathesis polymerization to access photodegradable polydicyclopentadiene and polyethylene-like materials显示文摘The development of degradable and recyclable polymers is an attractive strategy to tackle the post-consumption pollution issue of commercial plastics.Cyclic-acyclic monomers metathesis polymerization(CAMMP)has been recently reported to produce degradable thermoset,thermoplastic and elastomeric polymers,and their degradability is enabled with addition of various chemicals.In this contribution,we demonstrate that the utilization of diene comonomers containing photodegradable moiety can give access to thermoset and thermoplastic materials bearing photo-degradation capabilities.The copolymerization of a series easily accessible diene comonomers bearing photodegradable ortho-nitrobenzyl moieties with dicyclopentadiene(DCPD)or cyclooctene(COE)leads to the formation of photodegradable p DCPD thermosets and p COE thermoplastic polymers with mechanical properties comparable to their non-degradable counterparts.Most importantly,their photo-degradation properties can be efficiently tuned with the addition of ultraviolet absorber during in-situ polymerization. | Wu Li Daohong Liao Yougui Li Guifu Si Changle Chen | 2024 | Science China Chemistry2024，67，4： | 0 |
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