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| 1 | Syn-tectonic sedimentation and its linkage to fold-thrusting in the region of Zhangjiakou, North Hebei, China显示文摘The timing of the 'Yanshanian Movement' and the tectonic setting that controlled the Yanshan fold-and-thrust belt during Jurassic time in China are still matters of controversy. Sediments that filled the intramontane basins in the Yanshan belt perfectly record the history of 'Yanshanian Movement' and the tectonic background of these basins. Recognizing syn-tectonic sedimentation, clarifying its relationship with structures, and accurately defining strata ages to build up a correct chronostratigraphic framework are the key points to further reveal the timing and kinematics of tectonic deformation in the Yanshan belt from the Jurassic to the Early Cretaceous. This paper applies both tectonic and sedimentary methods on the fold-and-thrust belt and intramontane basins in the Zhangjiakou area, which is located at the intersection between the western Yanshan and northern Taihangshan. Our work suggests that the pre-defined 'Jurassic strata' should be re-dated and sub-divided into three strata units: a Late Triassic to Early Jurassic unit, a Middle Jurassic unit, and a Late Jurassic to early Early Cretaceous unit. Under the control of growth fold-and-thrust structures, five types of growth strata developed in different growth structures: fold-belt foredeep type,thrust-belt foredeep type, fault-propagation fold-thrust structure type, fault-bend fold-thrust structure type, and fault-bend foldthrust plus fault-propagation fold composite type. The reconstructed 'source-to-sink' systems of Late Triassic to Early Jurassic,Middle Jurassic and Late Jurassic to early Early Cretaceous times, which are composed of a fold-and-thrust belt and flexure basins, imply that the 'Yanshanian Movement' in our study area started in the Middle Jurassic. During Middle Jurassic to early Early Cretaceous times, there have been at least three stages of fold-thrust events that developed 'Laramide-type' basementinvolved fold-thrust structures and small-scale intramontane broken 'axial basins'. The westward migration of a 'pair' of basement-involved fold-thrust belt and flexure basins might have been controlled by flat subduction of the western Paleo-Pacific slab from the Jurassic to the Early Cretaceous. | Shaofeng LIU Chengfa LIN Xiaobo LIU Qitian ZHUANG | 2018 | Science China Earth Sciences2018，61，6： | 6 |
| 2 | Oxidative dehydrogenation of propane over Ni-Mo-Mg-O catalysts显示文摘In this work, a series of Ni-Mo-Mg-O catalysts with mesoporous structure prepared by sol-gel method were investigated for the oxidative dehydrogenation of propane (ODHP). The techniques of temperature-programmed reduction with H2 (H2-TPR), N2 adsorption-desorption, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and X-ray photoelectron spectra (XPS) were employed for catalyst characterization. It is found that the activity of the catalysts for ODHP increases first and then decreases with the increase of Mo content. The catalyst with a Mo/Ni atomic ratio of 1/1 exhibits the best catalytic activity, which gives the propene selectivity of 81.4% at a propane conversion of 11.3% under 600°C and maintains the good catalytic performance for 22 h on stream. This is related not only to its high reducibility and dispersion as revealed by TPR and XRD, but also to the formation of more selective oxygen species on the MoOx-NiO interface as identified by XPS. | Lin Wang Wei Chu Chengfa Jiang Yuefeng Liu Jie Wen Zaiku Xie | 2012 | Journal of Natural Gas Chemistry2012，21，1： | 4 |
| 3 | Growth structures and growth strata of the Qianjiadian Basin in the western Yanshan fold and thrust belt, North China显示文摘The northwestward subduction of the Izanagi Plate beneath the eastern Eurasian Plate during the Late Mesozoic caused a series of compressional deformation events in the Yanshan fold and thrust belt(YFTB), but the tectonic deformation timing, tectonic properties and relationship between tectonic uplift and sediment accumulation in the intermontane basins continue to be debated. For this reason, the sedimentology, sediment provenance, and basin structure of the Qianjiadian Basin(QJB) in the northern Beijing region during the Late Jurassic and Early Cretaceous were studied in detail. The results suggest that a fault-propagation fold-type(FPFT) growth structure and growth strata developed on the western edge of the QJB and that the top part of Member 2 and Member 3 of the Tuchengzi Formation are growth strata controlled by the limb rotation mechanism. In two small thrust faults in the QJB, the Mesoproterozoic Xiamaling Formation is thrust over the Tuchengzi Formation, and these faults may have controlled the development of the fault-bend fold-type growth strata. An analysis of the 'source-to-sink' process suggests that the hanging wall succession of the Shangyi-Pingquan fault(SPF) was the main source area of the Late Jurassic to early Early Cretaceous strata in the QJB. A zircon206 Pb/238 U age of 140.8±2.4 Ma for the volcanic rocks at the bottom of the FPFT growth strata represents the timing of the initiation of FPFT growth structure development. The discovery of the FPFT growth structure and growth strata in the QJB indicate that the QJB was an intermontane flexural basin controlled by fold and thrust structures during the early Early Cretaceous. Near the E-W-trending SPF, the NE-SW-trending Qianjiadian thrust fault(QJTF) and two small intrabasinal thrust faults may constitute a unified right-lateral strike-slip system that formed in response to the northwestward flat subduction of the Izanagi Plate beneath the East Asian continent during the Jurassic-Early Cretaceous. | Xiaofei SHI Shaofeng LIU Chengfa LIN | 2019 | Science China Earth Sciences2019，62，7： | 4 |
| 4 | Influence of channel length and layout on TID for 0.18 μm NMOS transistors显示文摘Different channel lengths and layouts on 0.18μm NMOS transistors are designed for investigating the dependence of short channel effects(SCEs)on the width of shallow trench isolation(STI)devices and designing in radiation hardness.Results show that,prior to irradiation,the devices exhibited near–ideal I–V characteristics,with no significant SCEs.Following irradiation,no noticeable shift of threshold voltage is observed,radiation–induced edge–leakage current,however,exhibits significant sensitivity on TID.Moreover,radiation–enhanced drain induced barrier lowering(DIBL)and channel length modulation(CLM)effects are observed on short–channel NMOS transistors.Comparing to stripe–gate layout,enclosed–gate layout has excellent radiation tolerance. | WU Xue LU Wu WANG Xin GUO Qi HE Chengfa LI Yudong XI Shanbin SUN Jing WEN Lin | 2013 | Nuclear Science and Techniques2013，24，6： | 0 |
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