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| 1 | Geochronology and geochemistry of Permo-Triassic sandstones in eastern Jilin Province(NE China): Implications for final closure of the Paleo-Asian Ocean显示文摘In the eastern part of the Central Asian Orogenic Belt(CAOB) in northeastern(NE) China, scattered outcrops of molasse deposits mark the ending of an orogeny and are crucial for understanding the evolution of the Paleo-Asian Ocean(PAO). However, the timing of tectonic events and the relationships among these strata remain controversial. To better constrain these geologic events, a comprehensive study of the detrital zircon U-Pb geochronology and geochemistry of the sandstones of the Kaishantun(KST) Formation and Kedao(KD) Group in eastern Jilin Province, NE China, was conducted. The KST Formation is traditionally considered a molasse deposit. The sandstones display low CIA, PIA and high ICV values and low Th/U and Rb/Sr ratios, which suggest that the rocks were derived from an immature intermediate-felsic igneous source and experienced a simple sedimentary recycling history with relatively weak chemical weathering. LA-ICP-MS U-Pb dating of detrital zircons from two samples of the KST Formation yields ages of 748-252 Ma, suggesting that the KST Formation was deposited between 254.5 Ma and 252 Ma in Late Permian. The zircons were mainly derived from the continental northern part of the North China Craton(NCC). In contrast, the U-Pb dating of detrital zircons from five samples of the KD Group yields ages of 2611-230 Ma, suggesting that the KD samples were deposited in the Early to Middle Triassic(ca. 248-233 Ma). The detrital zircon ages for the KD samples can be divided into groups with peaks at 2.5 Ga, 1.8 Ga, 800-1000 Ma, 500 Ma and 440-360 Ma, which suggest that the samples were derived from bidirectional provenances in the Jiamusi-Khanka Block and the NCC. These new data,combined with previously published results, suggest that at least three orogenic events occurred in central-eastern Jilin Province during the Early Permian(270-262 Ma), Early Triassic(254-248 Ma) and Middle-Late Triassic(242-227 Ma). The final closure of the PAO occurred during 242-227 Ma in the Middle-Late Triassic along the Changchun-Yanji suture zone. The detrital zircon geochronological data clearly record plate convergence and the scissor-like closure of the PAO in the eastern CAOB. | Qingxiang Du Zuozhen Han Xiaoli Shen Chao Han Zhigang Song Lihua Gao Mei Han Wenjian Zhong | 2019 | Geoscience Frontiers2019，10，2： | 6 |
| 2 | New Evidence of Detrital Zircon Ages for the Final Closure Time of the Paleo-Asian Ocean in the Eastern Central Asian Orogenic Belt(NE China)显示文摘Objective The NE China is located in the eastern segment of the Central Asian Orogenic Belt(CAOB),which is a large accretionary orogen between the Siberian Craton and the North China Craton(NCC).Many researches have discussed about the evolution of the Paleo-Asian Ocean(PAO)in the eastern CAOB.However,the timing of | DU Qingxiang HAN Zuozhen SHEN Xiaoli HAN Chao SONG Zhigang GAO Lihua HAN Mei ZHONG Wenjian YAN Junlei | 2017 | Acta Geologica Sinica(English Edition)2017，91，5： | 4 |
| 3 | Coupling control on pillar stress concentration and surface cracks in shallow multi-seam mining显示文摘In order to ensure safe mining and reduce surface damage in shallow multi-seam mining,the failure characteristics of interburden strata with different coal pillars offset distances between pillars in the upper and lower seams,the distribution characteristics of stress concentration in coal pillars,and the development characteristics of stratum cracks and subsidence were investigated by physical and UDEC2D simulation.Meanwhile,the effect of different coal pillar offset distances on stress concentration of coal pillar and development of stratum cracks were studied.Based on those results,a formula for safe mining and reducing surface damage was established,which provided a theoretical basis for safe and environmentally friendly mining in shallow multi-seam.According to the results,the optimal coal pillar offset distance(the side to side horizontal distance of the upper and lower coal pillars)between the upper and lower coal seams was developed to reduce the stress concentration of coal pillars and surface damage.The results of this study have been applied in Ningtiaota coal mine and have achieved good results in safe and environmentally friendly mining. | Qingxiang Huang Junwu Du Jie Chen Yanpeng He | 2021 | International Journal of Mining Science and Technology2021，31，1： | 4 |
| 4 | One-step conversion of syngas to light olefins over bifunctional metal-zeolite catalyst显示文摘Light olefins(C_(2)–C_(4))are fundamental building blocks for the manufacture of polymers,chemical intermediates,and solvents.In this work,we realized a composite catalyst,comprising MnxZry oxides and SAPO-34 zeolite,which can convert syngas(CO+H_(2))into light olefins.MnxZry oxide catalysts with different Mn/Zr molar ratios were facilely prepared using the coprecipitation method prior to physical mixing with SAPO-34 zeolite.The redox properties,surface morphology,electronic state,crystal structure,and chemical elemental composition of the catalysts were examined using H_(2)-TPR,SEM,XPS,XRD,and EDS techniques,respectively.Tandem reactions involved activation of CO and subsequent hydrogenation over the metal oxide catalyst,producing methanol and dimethyl ether as the main reaction intermediates,which then migrated onto SAPO-34 zeolite for light olefins synthesis.Effects of temperature,pressure and reactant gas flow rate on CO conversion and light olefins selectivity were investigated in detail.The Mn_(1)Zr_(2)/SAPO-34 catalyst(Mn/Zr ratio of 1:2)attained a CO conversion of 10.8%and light olefins selectivity of 60.7%,at an optimized temperature,pressure and GHSV of 380℃,3 MPa and 3000h^(−1) respectively.These findings open avenues to exploit other metal oxides with CO activation capabilities for a more efficient syngas conversion and product selectivity. | Ce Du Linet Gapu Chizema Emmerson Hondo Mingliang Tong Qingxiang Ma Xinhua Gao Ruiqin Yang Peng Lu Noritatsu Tsubaki | 2021 | Chinese Journal of Chemical Engineering2021，34，8： | 0 |
| 5 | Au/Ag_(2)S dimeric nanostructures for highly specific plasmonic sensing of mercury(Ⅱ)显示文摘Although many plasmonic nanosenosrs have been established for the detection of mercury(Ⅱ)(Hg^(2+)),few of them is feasible for analyzing natural samples with very complex matrices because of insufficient method selectivity.To address this challenge,we propose an epitaxial and lattice-mismatch approach to the synthesis of a unique Au/Ag_(2)S dimeric nanostructure,which consists of an Au segment with excellent plasmonic characteristics,and a highly stable Ag_(2)S portion with minimum solubility product (K_(sp)(Ag_(2)S)=6.3×10^(-50)).The detection relies on the chemical conversion of Ag_(2)S to HgS when reacting with Hg^(2+),resulting in a red shift in the absorption band of the connecting Au NPs.The concurrent color changes of the solution from gray purple to dark green and finally to navy correlate well with Hg^(2+)concentration,thus enables UV-vis quantitation and a naked-eye readout of the Hg^(2+)concentration.This method exhibits superior selectivity towards Hg^(2+) over other interfering ions tested because Hg^(2+) is the only ion that can react with Ag_(2)S to form HgS with even smaller solubility product (K_(sp)(HgS)=4×10^(-53)).The detection limit of this method is 1.21μmol/L,calculated by the signal-to-noise of 3.The practicability of the method was verified by analyzing the Hg^(2+)in sewage water samples without sample pretreatment with satisfactory recoveries (93.1%-102.8%) and relative standard deviations (1.38%-2.89%).We believe this method holds great potential for on-the-spot detection of Hg^(2+) in environmental water samples with complex matrices. | Xinyi Liang Xu Du Ao Liu Zhixiong Cai Jingwen Li Maosheng Zhang Qingxiang Wang Jingbin Zeng | 2023 | Chinese Chemical Letters2023，34，3： | 0 |
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