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Anatexis in Himalayan crust:Evidence from geochemical and chronological investigations of Higher Himalayan Crystallines

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Science china Earth Sciences 2005年第9期48卷 1347-1356页

作者： yang xiaosong1. jin zhenmin2 & ma jin1.1. state key laboratory of earthquake dynamics, institute of geology, china earthquake administration, beijing 1.0029, china 2. Faculty of Earth Sciences, china University of Geosciences, Wuhan 430074, china 1. state key laboratory of earthquake dynamics Institute of Geology China Earthquake Administration 100029 Beijing China 2. Faculty of Earth Sciences China University of Geosciences 430074 Wuhan China

Migmatization in Higher Himalayan Crystallines (HHC) results from anatexis. The widely distributed migmatites in HHC are an important clue to investigate the relationship be- tween anatexis and the origins of Higher Himalayan leucogranites (HHL), and to understand the effect of anatexis on crustal evolution during the post-collision period. We studied in detail the chemical features of three basic constituent parts of the migmatites, i.e. leucosome, mesosome and melanosome, and determined the K-Ar ages of leucosomes. Our studies indicate that type-I leucosome is the product of crystallization of melt generated by partial melting of mesosome at source region, but type-II leucosome and HHL probably underwent crystallization differentiation of plagioclase during melt aggregation and migration. The age of 22.67 ma of Type-I leucosome, which is a little older than the beginning of MCT movement, indicates that anatexis may have played an important role in the formation of MCT. That the ages of type-II leucosome (ranging from 14.82 to 18.37 ma) are consistent with that of HHL provides new chronological evidence for the relationship between migmatization and HHL. We obtained a very young age of 6.23 ma of Type-II leucosome that provides new time constraint on magma activity in the central segment of Higher Himalayas.

关键词： Higher Himalayan Crystallines, migmatite, anatexis, leucosome, K-Ar age.

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Insights into correlation between satellite infrared information and fault activities

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Progress in Natural Science:materials International 2006年第4期16卷 394-402页

作者： ma jin, WANG Yipeng, CHEN Shunyun, LIU Peixun and LIU Liqiang state key laboratory of earthquake dynamics, institute of geology, china earthquake administration, beijing 1.0029, china [a]state key laboratory of earthquake dynamics Institute of Geology China Earthquake Administration Bejing China

Tectonic activities are accompanied with material movement and energy transfer, which definitely change the state of thermal radiation on the ground. Thus it is possible to infer present-day tectonic activities based on variations of the thermal radiation state on the ground. The received satellite infrared information is, however, likely influenced by many kinds of factors. Therefore, the first problem that needs to be solved is to extract information on tectonic activities and eliminate effects of external (non-tectonic) factors. In this study, we firstly make a review of the current studies on this subject, and then present the technical approach and our research goal. Using the data of 20 years from the infrared band of the satellite of National Oceanic and Atmospheric administration (NOAA) and the method we have developed, we investigate fault activities in western china. The results show that the areas with high residual values of land surface brightness temperature (LSBT), which is presumably related to faultings in space, accord usually with the locations of followed major earthquakes. The times of their value growing are also roughly consistent with the beginning of active periods of earthquakes. The low frequency component fields of the LSBT, acquired from wavelet analysis, exhibit well the spatial distributions of active faults. The "heat penetrability index" (HPI) related with enhancement of subsurface thermal information has been expressed well for the backgrounds of accelerated tectonic motions, and some correlations exist between HPI and the local faulting and seismicity. This study provides a new approach to study temporal-spatial evolution of recent activities of faults and their interactions.

关键词： infrared emission fault activity residual of land surface brightness temperature heat penetrability index.

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Land use and river-lake connectivity: Biodiversity determinants of lake ecosystems

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Environmental Science and Ecotechnology 2024年第5期21卷 329-340页

作者： Huiyu Xie Yu ma Xiaowei jin Shiqi Jia Xu Zhao Xianfu Zhao Yongjiu Cai Jian Xu Fengchang Wu John P.Giesy state key laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing100012China College of Water Sciences Beijing Normal UniversityBeijing100875China china National Environmental Monitoring Centre Beijing100012China key laboratory of Ecological Impacts of Hydraulic-Projects and Restoration of Aquatic Ecosystem of Ministry of Water Resources Institute of HydroecologyMinistry of Water Resources and Chinese Academy of SciencesWuhan430079China Nanjing institute of Geography and Limnology Chinese Academy of SciencesNanjing210008China Department of Integrative Biology Michigan State UniversityEast LansingMI48895USA Department of Veterinary Biomedical Sciences and Toxicology Centre University of SaskatchewanSaskatoonSaskatchewanS7N 5B3Canada Toxicology Centre and Department of Veterinary Biomedical Sciences University of Saskatchewan44 Campus DriveSaskatoonSKS7N 5B3SaskatoonSKCanada

Lake ecosystems confront escalating challenges to their stability and resilience,most intuitively leading to biodiversity loss,necessitating effective preservation strategies to safeguard aquatic ***,the complexity of ecological processes governing lake biodiversity under multi-stressor interactions remains an ongoing concern,primarily due to insufficient long-term bioindicator data,particularly concerning macroinvertebrate *** we utilize a unique,continuous,and in situ biomonitoring dataset spanning from 2011 to 2019 to investigate the spatio-temporal variation of macroinvertebrate *** assess the impact of four crucial environmental parameters on Lake Dongting and Lake Taihu,i.e.,water quality,hydrology,climate change,and land *** two systems are representative of lakes with yangtze-connected and disconnected subtropical floodplains in *** find an alarming trend of declining taxonomic and functional diversities among macroinvertebrate communities despite improvements in water *** contributing factors to this decline include persistent anthropogenic pressures,particularly alterations in human land use around the lakes,including intensified nutrient loads and reduced habitat ***,river-lake connectivity is pivotal in shaping differential responses to multiple *** results highlight a strong correlation between biodiversity alterations and land use within a 2e5 km radius and 0.05e2.5 km from the shorelines of Lakes Dongting and Taihu,*** findings highlight the importance of implementing land buffer zones with specific spatial scales to enhance taxonomic and functional diversity,securing essential ecosystem services and enhancing the resilience of crucial lake ecosystems.

关键词： Taxonomic richness Functional diversity Biotic homogenization River-lake connectivity Multiple stressors

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Identification of meta-instable stress state based on experimental study of evolution of the temperature field during stick-slip instability on a 5° bending fault

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Science china Earth Sciences 2012年第6期55卷 869-881页

作者： ma jin S I SHERmaN GUO YanShuang state key laboratory of earthquake dynamics Institute of Geology China Earthquake Administration Beijing 100029 China institute of the Earth＇s Crust Siberian Branch of Russian Academy of Sciences lrkutsk 664033 Russia

Identification of the meta-instable stress state and study of its mechanism and evolution of relevant physical fields would be of great significance for determination of potential seismic risks and estimation of critical times. In laboratory experiments, that the specimen enters the meta-instable is marked by accelerated stress release. Could we use the experimental result to identify the earthquake in natural conditions? Because the observational data from one station can only reflect the stress state beneath this station, the key problem for identification of the meta-instability is how to recognize regional stress state through observational data from many stations. In this work, we choose the evolution of the temperature field over varied deformation stages during a stick-slip event on a 5 bending fault as an example, and attempt to find the response features of the physical quantity when the fault enters the meta-instable state. We discuss the characteristics of stages for the stress build-up, stress-time process deviating from linearity before instability, meta-instability, instability, and post-instability, respectively. The result shows that the fault instability slide is a conversion process from independent activities of each fault segment to synergism activity. The instability implies completion of the synergism. The stage deviating from linearity is the onset of stress release, and it is also the onset of the synergism. At the meta-instability stages, stress release becomes dominant, while the synergism tends to finish. Therefore, the analysis of the regional overall stress state should not start from individual stations, and instead it should begin with the evolution of the whole deformation field.

关键词： earthquake risk stress state meta-instable state evolution of the temperature field synergism bending fault

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A thermal physical index to explore current tectonic activity with satellite remote sensing

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Science china Earth Sciences 2012年第2期55卷 290-295页

作者： CHEN ShunYun ma jin LIU PeiXun LIU LiQiang HU XiaoYan state key laboratory of earthquake dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China

The use of satellite thermal infrared information is being developed as a method of exploring current tectonic activity. To realize real world application, an objective, stable and testable thermal physical index that is simultaneously related with tectonic activity must be established. From the viewpoint of the energy balance, the land surface is a boundary where energy is exchanged between outer space and the solid Earth. Regardless of how complex the influencing factors are, the land surface is mainly affected by the Sun, atmosphere and underground heat. In this paper, first, the relationships among land surface temperature, solar radiation, atmospheric temperature and thermal information from underground are obtained employing a mathematic physical method based on the equation of heat conduction and energy balance at the land surface. Second, a thermal physical index called the geothermal flux index (GFI), which can provide the activity state of underground heat, is constructed. Third, the theoretical basis of the thermal physical index is verified using stable annual variations in land surface temperature and solar radiation. Finally, combined with known crustal deformations derived using a global positioning system, the effectiveness of the GFI in extracting field tectonic motion is tested. The results indicate that the GFI is effective in providing information on current tectonic activity.

关键词： current tectonic activity thermal physical index geothermal flux index remote sensing

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Impact of the cold surge event in January 2021 on the power system of china

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Advances in Climate Change Research 2022年第6期13卷 803-810页

作者： Chang-Yi LIU Bo LU Lu jin Hao CHEN Jie WU yang XIANG Zhi-Yuan ma Zi-Jian ZHAO Fang yang Qing LIU Jiang-Tao LI Global Energy Interconnection Development and Cooperation Organization(GEIDCO) Beijing 100031China National Climate Centre China Meteorological AdministrationBeijing 100081China Renmin University of Chin1 Beijing 100872China state Grid Energy Research institute Co. Ltd.Beijing 102211China

During 6-10 January 2021,a recorded strong cold surge took place in china,with over 800 observational stations reaching their historical *** previous studies that focused on the response of either the power load or generation separately,this study quantitatively revealed the impacts on the balance between the demand and supply sides of the *** the demand side,the sensitivity of power load was found to increase substantially higher in southern china(0.533 GW°C^(−1))than in the northern region(0.139 GW°C^(−1))due to the limited municipal heating *** the supply side,the hourly wind power generation dropped from the highest of 110 GW on 6 January to the lowest of 54 GW on 9 January due to the reduction in wind *** addition,a reduction in solar power generation was observed during 8-10 ***,the balance of the power system was influenced by this cold *** an effective adaptation measure,results further showed that early warning by three weeks ahead can be obtained by an operational climate *** sensitivity of china's power system to such cold surge events may increase remarkably due to the expected increase in the proportion of wind and solar power generation in future new-type power ***,close cooperation between climate scientists and power engineers is needed to build the resilience of the power system to the cold extremes.

关键词： Cold surge event Power load Renewable power generation Sub-seasonal prediction Adaptation

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乌兰布和沙漠植物多样性及绿洲-荒漠区植被地上生物量研究

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生态学报 2024年第18期44卷 8234-8246页

作者：辛智鸣邵琪雯王湘李新乐马媛李星罗凤敏肖辉杰董树斌程瑾北京林业大学林木育种与生态修复国家工程研究中心林木资源高效生产全国重点实验室北京100083 中国林业科学研究院沙漠林业实验中心内蒙古磴口荒漠生态系统国家定位观测研究站磴口015200

通过对乌兰布和沙漠30个样地152个样方进行调查,利用maPGIS软件绘制了乌兰布和沙漠首个主要植物群落类型分布图,利用经典的物种多样性指数对乌兰布和沙漠区植物群落的物种多样性及群落结构进行分析,对绿洲区和荒漠区植被地上生物量、土... 详细信息

通过对乌兰布和沙漠30个样地152个样方进行调查,利用maPGIS软件绘制了乌兰布和沙漠首个主要植物群落类型分布图,利用经典的物种多样性指数对乌兰布和沙漠区植物群落的物种多样性及群落结构进行分析,对绿洲区和荒漠区植被地上生物量、土壤养分进行了显著差异性分析。结果表明:研究区共记录94种植物,隶属于21科58属,物种数量最多的3个科依次为菊科、禾本科和苋科。乌兰布和沙漠天然植被主要由16个群系35个群丛组成,以旱生、超旱生或盐生的小灌木和多年生草本植物占主导地位。分布面积最大的前三植物群系分别是:梭梭群系(1728.24 km^(2)),白刺群系(1278.27 km^(2))和沙冬青群系(746.79 km^(2))。群落优势层为灌木层,以小灌木和半灌木为主,白刺为样地出现频次最多的物种。整体上乌兰布和沙漠植物多样性水平较低,Shannon-Wiener指数和Simpson指数分别为2.1086和0.8158。目前人工绿洲对乌兰布和沙漠植物群落物种组成的影响不明显,但绿洲区植被地上生物量显著高于荒漠区。绿洲区和荒漠区在6个土层深度8个土壤养分指标上几乎没有显著性差异。相关调查和研究结果能够为乌兰布和沙漠地区的风沙治理、生态环境恢复和维护提供参考。

关键词：乌兰布和沙漠植物群落类型物种多样性生物量土壤养分

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Granitoid emplacement during syn-convergent transtension:An example from the Huamenlou pluton in North Qinling,central china

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Geoscience Frontiers 2018年第1期9卷 191-205页

作者： yang Li Wentian Liang Guowei Zhang Yazhou Ran Qi Shen jingli Wang Chunsheng jin state key laboratory of Continental dynamics Northwest UniversityXi’an 710069China Collaborative Innovation Centre of Continental Tectonics Northwest UniversityXi’an 710069China earthquake administration of Shaanxi Province Xi’an 710068China institute of geology and Geophysics Chinese Academy of SciencesBeijing 100029China

The Huamenlou pluton,is an elongated granite intrusion with high aspect ratio,emplaced within the southern margin of the North Qinling(central china).Here we investigate this pluton through multiple techniques including the fabric study,microstructural observation and zircon *** zircon U-Pb data confirm that the granite crystallized at ca.462 ma which is consistent with the ages of other linear plutons in North *** observations of the Huamenlou granites illustrate that the pluton has undergone superimposed deformation during its emplacement,from magmatic to hightemperature solid state *** internal fabric obtained by anisotropy of magnetic susceptibility(AMS)and shape preferred orientation(SPO)show similar *** fabrics are relatively concordant and generally vary from NE-SW to NEE-SWW which are roughly oblique to the trend of the pluton elongation and the regional ***,scalar parameters reflect two completely different strain regimes for the pluton and its host rocks,i.e.,the fabrics within host rocks are mainly oblate while the central part of the intrusion displays mainly prolate *** is inferred that the structural pattern recorded in this pluton was caused by local dextral transtension in consequence of oblique convergence between the South and North china *** propose that the local transtension in convergence setting probably evolved from vertical extrusion tectonics that provided room for the magma emplacement and imparted prolate fabrics in the Huamenlou pluton.

关键词： Zircon U-Pb dating magnetic fabric Shape preferred orientation Linear pluton Qinling Orogen

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Spatial-temporal variation of the land surface temperature field and present-day tectonic activity

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Geoscience Frontiers 2010年第1期1卷 57-67页

作者： jin ma Shunyun Chen Xiaoyan Hu Peixun Liu Liqiang Liu state key laboratory of earthquake dynamics Institute of Geology China Earthquake Administration Beijing 100029 China

This study attempts to acquire information on tectonic activity in western china from land surface temperature （LST） field data. On the basis of the established relationship between heat and strain, we analyzed the LSTdistribution in western china using the satellite data product MODIS/Terra. Our results show that： 1. There are departures from annual changes of LSTin some areas, and that these changes are associated with the activity of some active tectonic zones. 2. When annual-change background values caused by climate factors are removed, the long-period component （LSTLow） of temperature residual （AT） of the LSTis able to serve as an indicator for tectonic activity. We have found that a major earthquake can produce different effects on the/ST fields of surrounding areas. These effects are characterized by both rises and drops in temperature. For example, there was a noteworthy temperature decline associated with the Sumatran M9 earthquake of 2004 in the Bayan Har-Songpan block of central Tibetan Plateau. 3. On the other hand, the LST field of a single area may respond differently to major shocks occurring in different areas in the regions surrounding china. For instance, the Kun- lun M 8.1 event made the LSTon the Longmen Mountains fault zone increase, whereas the Zaisan Lake M 7.9 quake of 2003, and the Sumatran M 9 event of 2004, caused decreases in the same area＇s LST. 4. The variations of land surface temperature （LST） over time are different in different tectonic areas. These phenomena may provide clues for the study of tectonic deformation processes. On the basis of these phenomena, we use a combi- nation of temperature data obtained at varied depths, regional seismicity and strain results obtained with GPS measurements, to test the information related to tectonic activity derived from variations of the LST field, and discuss its implications to the creation of models of regional tectonic deformation.

关键词： Land surtace temperature(LST) field North-south seismic zone(N-S seismic zone) Bayan Har - Songpanblock Present-day tectonicactivity earthquake

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Numerical simulation of co-seismic deformation of 2011 Japan Mw9.0 earthquake

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Geodesy and Geodynamics 2011年第3期2卷 16-23页

作者： Zhang Keliang ma jin institute of geology China Earthquake Administration State Key Laboratory of Earthquake Dynamics Beijing 100029 China

Co-seismic displacements associated with the Mw9.0 earthquake on march 11, 2011 in Japan are numerically simulated on the basis of a finite-fault dislocation model with PSGRN/PSCMP software. Compared with the inland GPS observation, 90% of the computed eastward, northward and vertical displacements have residuals less than 0.10 m, suggesting that the simulated results can be, to certain extent, used to demon- strate the co-seismic deformation in the near field. In this model, the maximum eastward displacement increa- ses from 6 m along the coast to 30 m near the epicenter, where the maximum southward displacement is 13 m. The three-dimensional display shows that the vertical displacement reaches a maximum uplift of 14.3 m, which is comparable to the tsunami height in the near-trench region. The maximum subsidence is 5.3 m.

关键词： Japan Mwg. 0 earthquake co-seismic displacement GPS dislocation model subduction zone

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