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Possible South-Dipping Mesozoic Subduction at Southern Tethys Ocean-Constrained from Global Tectonic Reconstructions and Seismic Tomography

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Journal of Earth Science 2023年第1期34卷 260-279页

作者： Peilong Yan Nan Zhang huaiyu yuan Liang Qi Xiaoxu Liu The Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space SciencesPeking UniversityBeijing100871China Earth Dynamics Research Group School of Earth and Planetary SciencesCurtin UniversityPerthWA6845Australia ARC Centre of Excellence for Core to Crust Fluid Systems Macquarie UniversitySydneyNSW2109Australia

The evolution of the Tethys Ocean involved several episodes of ocean opening(including the Paleo-Tethys and Neo-Tethys) along its southern margin as terranes rifting away from eastern Gondwana. These oceans were terminated by well observed north-dipping subduction as the same terranes accreted to southern Eurasia. However, the presence of south-dipping subduction, though geologically proposed by numerous studies, have generally been omitted in the reconstruction of Tethyan evolution. Here, we synthesize the Mesozoic south-dipping subduction evolutions in the global reconstruction and focus on two potential events located along the northern edges of Southwest Borneo Block and the Woyla Arc. We next evaluate their slab volumes after thermal diffusion in the current mantle. Fast velocity anomalies in the mantle beneath the same region are then converted to cold anomalies and their volumes are further estimated and compared to the volumes evaluated from these two Mesozoic south-dipping subduction. We further identify seismic fast velocity anomalies likely relevant to slab remnants of south-dipping Tethyan subduction in the present-day mantle beneath the Indian ocean and West Australia, and link them to arc systems in plate reconstructions. In addition, one more tectonic scenario relevant to the north-dipping subduction in our study region is also examined. We speculate the relationship and evolution between such south-dipping subduction and north-dipping subduction in the south of Tethys Oceans. The attempt to reconstruct intermittent south-dipping subduction systems in southern Tethys region represents an effort on assessing rifting mechanisms in the opening of the Tethys Ocean and break-up of eastern Gondwana.

关键词： Tethys south-dipping subduction reconstruction seismic prospecting

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Fault-controlled regional magmatism and mineral deposition in central Cathaysia——Evidence from ambient noise tomography

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Science China Earth Sciences 2022年第9期65卷 1715-1735页

作者： Lingmin CAO huaiyu yuan Liang ZHAO Minghui ZHAO Haibo HUANG Tianyao HAO Xuelin QIU Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyInnovation Academy of South China Sea Ecology and Environmental EngineeringChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511438China ARC Centre of Excellence for Core to Crust Fluid Systems Department of Earth and Environmental SciencesMacquarie UniversityNorth RydeNSW 2109Australia Centre for Exploration Targeting University of Western AustraliaCrawley PerthWA 6009Australia State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100029China Key Laboratory of Petroleum Resources Research Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Key Laboratory of Submarine Geosciences Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China

Guangdong Province in the central Cathaysian Block has two world-class metallogenic belts, namely, the Nanling and Southeastern Coastal Metallogenic Belts(NLMB and SCMB), which are spatially coincide with the major regional Ganjiang and Zhenghe-Dapu Fault Zones(GJFZ and ZDFZ). However, what roles the faults played in mineral deposition and magmatism is unclear. Using ambient noise tomography, we obtain a 3-D whole-crust shear wave velocity model. By combining available regional geophysical models, we characterize the architecture of the regional shallow lithosphere and infer its possible tectonic connection to magmatic sources, pathways and surface deposition. The results show that the study area is loosely divided by the two major faults, the GJFZ and ZDFZ, into distinct velocity domains. In the north high Vand low V/Vcrust in the NLMB imply crustal remelting, which leads to the general felsic composition. In the coastal area, the lower crustal high Vanomaly is attributed to upwelling melts associated with Cretaceous magmatic activity. Between mineral belts, a swath of crustal lowvelocity zones extend into the uppermost mantle, manifesting partial melting related to upwelling magmas that may hint at a deep origin of magma from subcrustal lithosphere and likely feed surface mineral deposits through major faults. Secondary NW-trending faults coincide with low velocities and facilitated magmatic migration. A correlation between coastward extension of low velocities and younging of the Jurassic and Cretaceous magmatism is suggestive of a combined effect of slab rollback and a change in the direction of the Paleo-Pacific subduction system. We speculate a regional fault-control model in the central Cathaysian Block for the spatial-temporal evolution of regional deformation and magmatism during the middle Mesozoic.

关键词： Ambient noise tomography Crustal Vs structure Ganjiang Fault Zone Zhenghe-Dapu Fault Zone Mesozoic magmatism

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Ambient noise tomography of a linear seismic array based on an improved Voronoi tessellation

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Earthquake Science 2023年第6期36卷 477-490页

作者： Kun Wang Weitao Wang Libo Han Tingzi Li yuan Ling Jianchao Zhou huaiyu yuan Institute of Geophysics China Earthquake AdministrationBeijing 100081China Institute of Geology and Geophysics Chinese Academic of SciencesBeijing 100029China Geological Survey of Western Australia PerthWA 6001Australia

Ambient noise tomography,when applied to a dense linear seismic array,has the capability to provide detailed insights into the fine velocity structures across diverse tectonic *** linear station arrangement naturally generates parallel and concentrated ray paths along the array *** unique geometry requires specific optimization of the inversion methodology and model *** Bayesian-based transdimensional inversion method,characterized by its fully non-linear nature and high degree of freedom in parameter settings,offers a powerful tool for ambient noise *** effectively adapt this method to a linear array layout,we propose a modification to the Voronoi cell tessellation built in the transdimensional *** introducing spatial priority to the Voronoi kernels,we strategically increased the density of Voronoi cells along the direction of the *** then applied the modified approach to a linear seismic array in the North China Craton and validated its robustness through phase velocity images and resolution *** improved non-uniform sampling technique in the 2-D model space accelerates convergence while simultaneously enhancing model *** with the conventional damped leastsquares method,the proposed algorithm revealed a shear-wave velocity map with notable low-velocity anomalies situated in the middle and lower crust beneath the borders of the Ordos block and its surrounding orogenic *** with the crustal structures revealed by receiver function and electrical imaging,our findings indicated that the western and eastern margins of the Ordos block had experienced intensive crustal wedge deformation and re-melting,respectively.

关键词： Voronoi cell transdimensional Bayesian method ambient noise inversion S velocity North China Craton

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植物乳杆菌发酵蓝莓汁发酵和贮藏过程中理化指标及挥发性风味物质的变化

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食品工业科技 2025年第1期46卷 259-273页

作者：廖茂雯韩琛刘玮李艳琳陈昌琳袁怀瑜周艳李可李华佳四川省农业科学院农产品加工研究所(四川省农业科学院食物与营养健康研究所) 四川成都610000 新疆农业科学院吐鲁番农业科学研究所新疆吐鲁番830091 四川省农业科学院经济作物研究所四川成都610399

为了解植物乳杆菌发酵对蓝莓汁在发酵和贮藏过程中理化指标和挥发性风味物质的变化规律的影响,以新鲜巴尔德温为原料,利用植物乳酸菌b-1发酵蓝莓汁,研究发酵和贮藏过程中理化指标和活菌数的变化,并利用HPLC和顶空固相微萃取气质联用(HS-... 详细信息

为了解植物乳杆菌发酵对蓝莓汁在发酵和贮藏过程中理化指标和挥发性风味物质的变化规律的影响,以新鲜巴尔德温为原料,利用植物乳酸菌b-1发酵蓝莓汁,研究发酵和贮藏过程中理化指标和活菌数的变化,并利用HPLC和顶空固相微萃取气质联用(HS-SPME-GC/MS)测定蓝莓汁的有机酸和风味代谢物,分析其发酵和贮藏过程中风味品质的变化规律。结果表明,发酵24 h的蓝莓汁中的活菌数达到了108 CFU/mL;储藏28 d后活菌数为6.4×107 CFU/mL。蓝莓汁发酵期间理化性质变化较大,发酵过程中总酸含量逐渐增加,而pH呈现显著下降趋势(P酮类>酯类>醛类>烷类>烯类。基于PCoA和OPLS-DA分析结果表明,利用植物乳杆菌发酵的蓝莓果汁在发酵期和贮藏期的风味代谢物差异较大,分别检测到14种、9种差异代谢物,且发酵阶段发酵蓝莓汁中芳樟醇和香叶醇的相对含量有所上升,增强了果汁的柑橘香、花香和玫瑰香气。该研究为植物乳杆菌在蓝莓发酵果汁中的应用提供了科学支撑。

关键词：蓝莓汁植物乳杆菌 GC-MS PCoA OPLS-DA

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Remnant Paleoproterozoic Subduction or Lithospheric Drip Initiation at the Yilgarn Craton Margin:Constraints from P-wave Tomography

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Acta Geologica Sinica(English Edition) 2024年第S01期98卷 72-74页

作者： XU Xiaobing WANG Kun YANG Dinghui ZHAO Liang yuan huaiyu Department of Mathematical Sciences Tsinghua UniversityBeijing 100084China Institute of Geophysics China Earthquake AdministrationBeijing 100081China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100086China ARC Centre of Excellence for Core to Crust Fluid Systems Department of Earth and Environmental SciencesMacquarie UniversityNorth RydeNSW 2109Australia Centre for Exploration Targeting University of Western AustraliaCrawley PerthWA 6009Australia

The Paleoproterozoic was a critical time in whether modern-style plate tectonics had become globally dominant(e.g.,Wan et al.,2020).The Capricorn Orogen witnessed the assembly of the Pilbara and Yilgarn Cratons and an exotic microcontinent,the Glenburgh Terrane,to form the West Australia Craton(WAC)through two collisional orogenic events,the 2215–2145 Ma Ophthalmian and 2005–1950 Ma Glenburgh Orogenies(Johnson et al.,2013;Fig.1).Compared to other Proterozoic orogenic belts in Australia,the Capricorn Orogen preserves‘complete'opposing continental margin successions,together with intervening arc fragments associated with oceanic closure and foreland basins associated with collisional loading(Cawood et al.,2009).

关键词： P-wave tomography finite-frequency method subduction Capricorn Orogen

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Dynamic modeling of tectonic carbon processes:State of the art and conceptual workflow

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Science China Earth Sciences 2023年第3期66卷 456-471页

作者： Liang ZHAO Zhengtang GUO huaiyu yuan Xinxin WANG Hao SHEN Jianfeng YANG Baolu SUN Ning TAN Hui ZHANG Yonggang LIU Yang LI Jiamin WANG Weiqiang JI Rixiang ZHU State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China ARC Centre of Excellence for Core to Crust Fluid Systems Department of Earth and Planetary SciencesMacquarie UniversityNew South Wales 2109Australia Laboratory for Climate and Ocean-Atmosphere Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking UniversityBeijing 100871China

Plate tectonics plays a critical role in modulating atmospheric CO_(2)concentration on the geological timescale(≥106year).A growing consensus on tectonic and Earth’s CO_(2)history in the Cenozoic and deeper time provides solid restrictions and standards for testing tectonic carbon processes against global *** this,modeling the causal relationship between tectonic events and atmospheric CO_(2)levels remains a *** examine the current state of the global tectonic CO_(2)research and suggest a conceptual workflow for numerical experiments that integrates plate tectonics and deep carbon *** tectonic carbon cycle modeling should include at least four modules:(1)simulation of carbon-carrying processes,such as carbon ingassing and outgassing at the scale of minerals;(2)calculation of CO_(2)fluxes in tectonic settings like subduction,mantle plume,and plate rifting;(3)reconstruction of carbon cycling within the plates-scale tectonic scenario,particularly involving the processes of supercontinent convergence and dispersion;and(4)comparison with atmospheric CO_(2)history data and iterations,aiming to find the coincidental link between different tectonic carbon fluxes and climate *** to our analysis,the recent advancements in each of the four modules have paved the path for a more general *** envision that the large variety of carbon transportation parameters across more than ten orders of magnitude in both time and space is the primary technical hurdle in simulating tectonic carbon *** propose a boundary-condition-connected approach for simulating the global carbon cycle to realize carbon exchange between the solid earth and surface spheres.

关键词： Tectonic carbon cycling Tectonic CO_(2)modeling Boundary-condition-connected approach

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SAW diffraction field generated by source with finite aperture piezoelectric crystal surfaces

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Chinese Journal of Acoustics 1992年第1期11卷 1-11页

作者： WANG Chenghao , FAN Siqi, FAN huaiyu and LIU yuan(Institute of Acoustics, Academia Sinica, Beijing, 100080)

So far, the diffracted SAW field generated by an IDT with finite aperture on piezoelectric crystal surfaces is usually analyzed phenomenologically with the angular spectrum theory. A major approximation of this theory is to ignore the vector nature of the field by assuming that the wave field can be represented by a scalar as in optics. In this paper, a rigorous vector field theory of the surface excitation of elastic wave field in piezoelectric crystal developed by the authors is used to evaluate the SAW diffraction field adepately and precisely. As an example, numerical results for YZ-LiNbO3 are presented and compared with those obtained form the angular spectrum theory.

关键词： SAW diffraction field generated by source with finite aperture piezoelectric crystal surfaces

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低贫铁矿熔融还原炼铁的熔渣用于微晶玻璃制备

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硅酸盐学报 2007年第1期35卷 65-68,80页

作者：李克庆许永倪文袁怀雨北京科技大学金属矿山高效开采与安全教育部重点实验室北京100083

以河北司家营铁矿的低贫难选铁矿石为主要原料,研究了采用熔融还原法炼铁和浇铸工艺制备微晶玻璃的可行性,获得了可用于炼钢的生铁原料和建筑装饰用微晶玻璃。利用正交试验设计方法,探讨了不同原料配比组成条件下渣铁分离和熔渣晶化的效... 详细信息

以河北司家营铁矿的低贫难选铁矿石为主要原料,研究了采用熔融还原法炼铁和浇铸工艺制备微晶玻璃的可行性,获得了可用于炼钢的生铁原料和建筑装饰用微晶玻璃。利用正交试验设计方法,探讨了不同原料配比组成条件下渣铁分离和熔渣晶化的效果,确定了可用于工业试验的最佳原料配比:铁矿石62%(质量分数,下同),氧化铝粉5%,生石灰15%,萤石3.3%,纯碱8.4%,焦炭6.2%。通过光学显微分析、X射线衍射分析、物理化学性能测试等手段确定了微晶玻璃的物相组成及性能特征。结果表明:在最佳条件下制备的微晶玻璃由硅灰石晶体和玻璃相组成,抗压强度为827MPa,Mohs硬度为6,体积密度2.69g/cm3,吸水率为0.016%,耐酸性0.08%,耐碱性0.05%。

关键词：低贫铁矿炼铁微晶玻璃综合利用

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Carbonated Silicate Melt-Peridotite Interaction and Generation of Continental Intraplate Alkali Basalts

Carbonated Silicate Melt-Peridotite Interaction and Generati...

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中国矿物岩石地球化学学会第17届学术年会

作者：徐荣刘勇胜 Xuance Wang Stephen Foley Yanfei Zhang huaiyu yuan State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of Geosciences Institute for Geoscience Research (TIGeR) Department of Applied GeologyCurtin University ARC Centre of Excellence for Core to Crust Fluid Systems Department of Earth and Planetary SciencesMacquarie University College of Oceanography Hohai University Geological Survey of Western Australia Mineral House Centre for Exploration Targeting University of Western Australia

＜正＞Although the deep carbon recycling has been proposed to play a key role in producing intraplate magmatism,the question of how it controls or triggers mantle melting remains poorly understood. Here we present geochemical evidence for existence of pervasive carbonate melt in the mantle source of Cenozoic intraplate alkali basalts in eastern China. The primary magma

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卖空限制对股票市场收益非对称性的影响——基于上海和香港的实证比较研究

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管理学报 2009年第8期6卷 1098-1103页

作者：袁怀宇张宗成华中科技大学经济学院

利用改进的BB法则划分股市的波动周期,运用EGARCH-GED模型比较研究了上海和香港股票市场的非对称性问题。通过研究发现,上证综指的收益分布从长期来看呈负偏,而恒生指数呈正偏;在熊市中两个市场均存在"杠杆效应",在牛市中香港市场坏消... 详细信息

利用改进的BB法则划分股市的波动周期,运用EGARCH-GED模型比较研究了上海和香港股票市场的非对称性问题。通过研究发现,上证综指的收益分布从长期来看呈负偏,而恒生指数呈正偏;在熊市中两个市场均存在"杠杆效应",在牛市中香港市场坏消息的影响仍然更大,而上海市场则存在"反杠杆效应"。出现这一差异主要由于上海证券市场缺乏卖空机制,影响了价格对坏消息的吸收,这一结果能够解释我国内地股市"暴涨暴跌"的现象。

关键词：卖空限制 EGARCH—GED模型非对称性

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