检索结果-南通市图书馆

The Origin of Mesozoic A-type Granitoids,Fujian Province,southeast china:Insights from Geochronology,Mineralogy and Geochemistry

引用

Acta Geologica Sinica(English Edition) 2024年第3期98卷 630-640页

作者： XIE Qifeng DONG Yunpeng CAI Yuanfeng ZHAI Mingguo XIAO Aifang ZHANG Hong Zijin School of Geology and Mining Fuzhou UniversityFuzhou 350108China State Key Laboratory of Continental Dynamics Northwest UniversityXi’an 710069China State Key Laboratory for Mineral Deposits Research Nanjing UniversityNanjing 210023China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 10029China

The magma sources,origins and precise forming ages of the miarolite from Qishan and Kuiqi intrusions are still uncertain.New results reveal that,miarolites from the Qishan and Kuiqi intrusions yield crystallization ages of~101 and~98 Ma,and they have a high formation temperature(~910℃)and low oxygen fugacity value,indicating crystallization condition at low pressure in the upper crust with temperature of 678℃.The Qishan and Kuiqi miarolites are characterized by enrichment in SiO_(2) and high-K alkali,depletion in Ca and Mg,and belong to the high-K weak peraluminous rock series.The samples are enriched in HFSEs(i.e.,Ta,Zr and Hf)and LILEs(i.e.,Ba,P and Sr),depleted in Ba and Sr with the negative anomaly of Eu.In the primitive mantle normalized trace element spider diagram,the samples show a right-inclined‘seagull-type’pattern,combined the ratios of(La/Yb)_N,10000×Al/Ga,Rb/Nb and Nb/Ta etc.,they were proved to be alkaline A-type granite.Combined the characterize of the trace elements,they were derived from clay-rich source accompanied pelite melting,and subjected to K-feldspar crystallization fractional.The values of ε_(Hf)(t)and tDM2 are distributed in the range of-2.8 to 3.3 with~1.2 Ga,and-6.0 to 4.0 with~1.2 Ga,revealing that they were generated from the Mesoproterozoic Cathaysia basement rocks.The comprehensive research reveals the Kuiqi and Qishan intrusions derived from crust-mantle mixing and partial melting of the crust,respectively,resulting from lithospheric extension generated by the Paleo-Pacific Plate subducted into the European-Asian Plate.

关键词： A-type granitoid geochronology extension subduction Mesozoic southeast china

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Characteristics of Lightning Activity in southeast china and its Relation to the Atmospheric Background

引用

Journal of Tropical Meteorology 2024年第1期30卷 76-88页

作者：支树林朱杰刘岩毛梦妮 Jiangxi Meteorological Observatory Nanchang 330096 China Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites National Satellite Meteorological Center(National Center for Space Weather)China Meteorological AdministrationBeijing 100081 China Shanghai Typhoon Institute China Meteorological AdministrationShanghai 200030 China Innovation Center for FengYun Meteorological Satellite(FYSIC) Beijing 100081 China Key Laboratory of Transportation Meteorology of china Meteorological Administration Nanjing Joint Institute for Atmospheric SciencesNanjing 210041 China Key Laboratory of Meteorological Disaster(KLME) Ministry of Education&Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CICFEMD)Nanjing University of Information Science&TechnologyNanjing 210041 China Jiujiang Observatory JiujiangJiangxi 332000 China

Based on the lightning observation data from the Fengyun-4A(FY-4A)Lightning Mapping Imager(FY-4A/LMI)and the Lightning Imaging Sensor(LIS)on the International Space Station(ISS),we extract the“event”type data as the lightning detection results.These observations are then compared with the cloud-to-ground(CG)lightning observation data from the china Meteorological Administration.This study focuses on the characteristics of lightning activity in southeast china,primarily in Jiangxi Province and its adjacent areas,from April to September,2017–2022.In addition,with the fifth-generation European Centre for Medium-Range Weather Forecasts reanalysis data,we further delved into the potential factors influencing the distribution and variations in lightning activity and their primary related factors.Our findings indicate that the lightning frequency and density of the FY-4A/LMI,ISS-LIS and CG data are higher in southern and central Jiangxi,central Fujian Province,and western and central Guangdong Province,while they tend to be lower in eastern Hunan Province.In general,the high-value areas of lightning density for the FY-4A/LMI are located in inland mountainous areas.The lower the latitude is,the higher the CG lightning density is.High-value areas of the CG lightning density are more likely to be located in eastern Fujian and southeastern Zhejiang Province.However,the high-value areas of lightning density for the ISS-LIS are more dispersed,with a scattered distribution in inland mountainous areas and along the coast of eastern Fujian.Thus,the mountainous terrain is closely related to the high-value areas of the lightning density.The locations of the high-value areas of the lightning density for the FY-4A/LMI correspond well with those for the CG observations,and the seasonal variations are also consistent.In contrast,the distribution of the high-value areas of the lightning density for the ISS-LIS is more dispersed.The positions of the peak frequency of the FY-4A/LMI lightning and CG lightning contrast with local altitudes

关键词： lightning satellite and ground detections atmospheric background southeast china

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A novel seed cone of Pinus from the Miocene of coastal southeast china indicates kinship with southeast Asian pines

引用

Plant Diversity 2023年第6期45卷 732-747页

作者： Xiang-Chuan Li Yi Hu Xiang Zhang Liang Xiao Li-Na Liang Rui-Zhi Zhang Lei Qiao School of Earth Sciences and Resources Chang'an UniversityXi'an 710054China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China Shaanxi Key Laboratory of Early Life and Environments Northwest UniversityXi'an 710069China Exploration Company Shaanxi Yanchang Petroleum(Group)Co.LTD.Yan'an 716099China Beijing Youth Education SciTech Co. LTD.Beijing 100089China

Pinus is an economically and ecologically important genus whose members are dominant components globally in low-latitude mountainous and mid-latitude temperate forests.Pinus species richness is currently concentrated in subtropical mid-low latitudes of the Northern Hemisphere,differing from the latitudinal diversity gradient mostly recognized in woody angiosperms.How the present pattern was developing in Earth's past is still poorly studied,particularly in eastern Asia.Here,a new fossil species,Pinus shengxianica sp.***.is described based on a fossil seed cone from the Late Miocene Shengxian Formation in Zhejiang,southeast china.A co-occurring cone is recognized as a known fossil species,Pinus speciosa Li.Extensive comparison of extant and fossil members of Pinus suggests P.shengxianica shares a striking cone similarity to Pinus merkusii and Pinus latteri(subsection Pinus)from tropical southeast Asia in having annular bulges around the umbo on the apophysis.The morphological resemblance indicates these two extant low-latitude pines probably possess a close affinity with the present newly-discovered P.shengxianica and originated from East Asian mid-low latitude ancestors during this generic re-diversification in the Miocene.This scenario is consistent with the evolutionary trajectory reflected by the pine fossil history and molecular data,marking the Miocene as a key period for the origin and evolution of most extant pines globally.The co-occurrences of diverse conifers and broadleaved angiosperms preferring diverse niches demonstrate Late Miocene eastern Zhejiang was one of the hot spots for coniferophyte diversity and hosted a needled-broadleaved mixed forest with complex vegetation structure and an altitudinal zonation.

关键词： Fossil cones Pinus southeast china Miocene Phytogeography Paleoecology

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Upwelling of Mantle-derived Material in southeast china:Evidence from Noble Gas Isotopes

引用

Acta Geologica Sinica(English Edition) 2022年第1期96卷 100-110页

作者： WANG Shuai KUANG Jian HUANG Xuelian ZHANG Hongyan ZHANG Min QI Shihua HAN Yongjie XIAO Zhicai WANG Siqi TANG Ling china University of Geosciences Wuhan 430074China No.935 Geological Brigade Geology Bureau for Nonferrous Metals of Guangdong ProvinceHuizhouGuangdong 516000China Chinese Academy of Geological Sciences Beijing 100037China

Shallow groundwater collected in Chaozhou,Huizhou,and Guangzhou allowed testing of concentrations and the isotope ratios of noble gases.Based on the calculated noble gas temperature(NGT)and the ratio of noble gas isotopes,the recharge temperature,recharge source,and residence time of groundwater can be calculated.In addition,the contribution of noble gas components from different sources to the sample components can be assessed.In the Huizhou area,according to the 1/Xe vs.Ne/Xe and NGT data,the shallow sandstone-confined water samples in the Shiba area and the unconfined water samples of the Huangshadong are in different temperature ranges,indicating that they have different recharge sources,both in time or space.The He components in the samples are calculated to obtain the content of radiogenic ^(4)He in the crust and to simulate the groundwater ages.The noble gas isotope ratios show the addition of mantle components into the basalt aquifers and sandstone aquifers in Chaozhou and Huizhou.Except for atmospheric and crustal sources,there is a certain proportion of mantle-derived components in the shallow underground cold water in Huizhou and Chaozhou.The noble gases in the Chaozhou groundwater have an obvious mantle signature,allowing speculation that there is a deep fluid carrying mantle characteristics.This upwelling of mantle-derived material might be caused by the India-Eurasia collision or that between the Philippine Sea Plate and the Eurasian Plate.

关键词： groundwater hydrochemistry noble gases ^(4)He age mantle source input southeast china

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Different Impacts of Intraseasonal Oscillations on Precipitation in southeast china between Early and Late Summers

引用

Advances in Atmospheric Sciences 2022年第11期39卷 1885-1896页

作者： Junqi LIU Riyu LU State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100029China

This study investigates the influences of boreal summer intraseasonal oscillation(BSISO), which originates from the equatorial Indian Ocean and prevails over the Indo-Pacific region, on precipitation over southeast china, including South china and Yangtze River Valley. The results indicate that the BSISO-related precipitation anomalies are remarkably different between early summer(May–June) and late summer(July–August). The BSISO-related precipitation anomalies tend to appear more northward in late summer in comparison with early summer. Accordingly, the BSISO is significantly related to precipitation anomalies over South china during many phases in early summer but related to very weak anomalies during all the phases in late summer. Such northward shifts of precipitation anomalies from early summer to late summer are clearest during phases 4 and 7, when the lower-tropospheric anticyclonic and cyclonic circulation anomalies dominate over the subtropical western North Pacific, respectively. Finally, we explain the differences between early and late summers through the seasonal northward migration of climatological equivalent potential temperature gradient, which is located in the South china during early summer but migrates northward to the YRV during late summer.

关键词： intraseasonal oscillation precipitation southeast china

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Detecting the Origins of Moisture over southeast china:Seasonal Variation and Heavy Rainfall

引用

Advances in Atmospheric Sciences 2016年第3期33卷 319-329页

作者： Xiuzhen LI Wen ZHOU Yongqin David CHEN Department of Geography and Resource Management The Chinese University of Hong Kong Guy Carpenter Asia–Pacific Climate Impact Centre School of Energy and EnvironmentCity University of Hong Kong Department of Geography and Resource Management and Institute of EnvironmentEnergy and SustainabilityThe Chinese University of Hong Kong

To examine the ability of the Hybrid Single-Particle Lagrangian Integrated Trajectory （HYSPLIT） model to detect the origins and paths of moisture supplied to southeast china, trajectories of air particles released over southeast china were traced backward during 1 April 2012 to 31 March 2013 and three typical regional persistent heavy rainfall events. The HYSPLIT model provides more insightful information than water vapor flux. Analysis of the specific humidity along the trajectories revealed the origins of moisture and their contributions to the moisture supply in southeast china. In the boreal summer half year, four key moisture transport paths from the eastern Indian Ocean, central Indian Ocean, South china Sea （SCS）, and western North Pacific （WNP） contribute 10%, 20%, 31%, and 16% of the moisture to southeast china, respectively. In the winter half year, the contributions of the paths from the WNP and North china double. Examination of heavy rainfall events showed that under tropical storm conditions, all moisture transport routines are rotated cyclonically before reaching southeast china. The invasion of cold air can trigger heavy rainfall in both the summer and winter half years but plays different roles： it does not contribute to the moisture supply but plays a key role in converging and uplifting the moisture in the summer half year, while it supplies a great amount of moisture in the winter half year as it absorbs abundant moisture in crossing the WNE

关键词： moisture origin southeast china HYSPLIT seasonal variation heavy rainfall

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Jurassic Intra-plate Basaltic Magmatism in southeast china:Evidence from Geological and Geochemical Characteristics of the Chebu Gabbroite in Southern Jiangxi Province

引用

Acta Geologica Sinica(English Edition) 2005年第5期79卷 662-672页

作者： XIE Guiqing MAO Jingwen HU Ruizhong LI Ruiling JIANG Guohao CAO Jinjian ZHAO Junhong State Key Laboratory of Geological Process and Mineral Resourses China University of Geosciences Beijing 100083 Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 Institute of Geochemistry Chinese Academy of Sciences Guiyang Guizhou 550002 Earth Science Department Sun Yat-Sun University Guangzhou Guangdong 510275 Earth Science Department Sun Yat-Sun University Guangzhou Guangdong 510275

Geochemical and isotopic investigations have been carded out on the Chebu gabbroite in southern Jiangxi Province, southeast china and these results are compared with gabbro bodies along the coast of Fujian Province in order to understand their magma sources and tectonic implications. The Chebu intrusion formed at the beginning of the Middle Jurassic （172~4.3 Ma）. These rocks are Ti-rich and Al-poor in major elements, characterized by strong enrichment in large-ion lithophile elements （LILE） and moderate enrichment in high field strength elements （HFSE） and light rare-earth elements CLREE）, without pronounced Nb or Ta anomalies. Age-correlated Sr-Nd isotope ratios show moderately high ranges of （^87Sr/^86Sr）i from 0.7065 to 0.7086 and 0.5124 to 0.5125 of （^143Nd/^144Nd）i. The geochemical characteristics of the Chebu gabbroite suggest that it is notably different from island-arc basalt and similar to intra-plate basaltic rocks. By combining interpretations of its geological and geochemical characteristics and the regional geological development history, the Chebu gabbroitic intrusion is thought to be the product of asthenosphere upwelling and rapid lithosphere extension during a transition of tectonic systems in southeast china. The tectonic environment and source characteristics of the intrusion are different from Cretaceous gabbro bodies along the coast of Fujian Province, The former formed in a tectonic environment of rapid intra-plate lithospheric extension and the source characteristics were of a weakly enriched primitive mantle, whereas the latter originated mainly in a volcanic-magmatic arc extensional tectonic environment and the nature of the source was an enriched mantle with more subduct subducted components.

关键词： gabbroite geochemical characteristics geodynamics setting Jurassic Jiangxi southeast china

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

OSL chronology of a Palaeolithic site in a humid subtropical mountainous area of southeast china

引用

Journal of Mountain Science 2021年第8期18卷 2012-2023页

作者： JIN Jian-hui WANG Xiao-yang ZHOU Zhen-yu HUANG Yun-ming FAN Xue-chun ZUO Xin-xin LING Zhi-yong REN Yong-qing LI Shu-tong School of Geographical Sciences Fujian Normal UniversityFuzhou350007China Center for southeast environmental archaeology Fujian Normal UniversityFuzhou350007China Fujian Institute of Archaeology Fuzhou350001China The institute of Archaeology Chinese Academy of Social SciencesBeijing100710China School of Humanities Minjiang UniversityMinhou350108China Pingtan International Institute of Austronesian Archaeology Pingtan350400China Qinghai Institute of Salt Lakes Chinese Academy of SciencesXi’ning810008China

The timing of Palaeolithic human activities in South china is still controversial because of the lack of a reliable chronology of archaeological sites.The Longdengshan Palaeolithic site(LPS),located close to the Wuyi Mountain of South china,represents the first discovered and scientifically excavated Middle Palaeolithic site in the Fujian Province.This site is of considerable significance for studying the diffusion and cultural connotation of early Homo sapiens in southern china.In this study,we present optically stimulated luminescence(OSL)ages obtained from medium-grained quartz collected at the LPS.The single-aliquot regenerative-dose measurements of red soil deposits collected at the same site yielded internally and stratigraphically consistent ages and similar errors,indicating a potential ability of the technique,and also reflecting the influence of various sedimentary facies on the test results.Our results indicate that the 38–63µm quartz grains were generally partially-bleached and had large values of over-dispersion in the palaeo-reticulated laterites of west Fujian.Some samples yielded unsatisfactory results,suggesting that the degree of bleaching of diluvial and alluvial deposits should be properly assessed before dating.We did not detect any enrichment/depletion of U,Th and radioactive disequilibrium.The effect of chemical weathering on the dose rate estimation was negligible.Therefore,we used a central age model and the maximum age model to calculate the age of two samples,respectively,and the minimum age model to calculate the ages of the rest of the samples.The OSL ages of the samples ranged from 27.09±2.30 ka to 54.65±7.39 ka for the 38–63µm quartz size fraction,and roughly corresponded to the Marine Isotope Stage 3.In addition,three ages out of five are based on the calculation of minimum ages in this research,which needs to be further verified by other dating methods.

关键词： OSL dating Palaeolithic site chronology southeast china

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The combined influence of background climate and urbanization on the regional warming in southeast china

引用

Journal of Geographical Sciences 2012年第2期22卷 245-260页

作者： SI Peng REN Yu LIANG Dongpo LIN Bingwen Tianjin Meteorological Information Center Tianjin Meteorological Bureau Tianjin 300074 China Tianjin Climate Center Tianjin Meteorological Bureau Tianjin 300074 China Xiamen Meteorological Bureau Xiamen 361100 Fujian China

Based on china homogenized land surface air temperature and the National Centers for Environmental Prediction/Department of Energy （NCEP/DOE） Atmospheric Model Intercomparison Project （AMIP）- Ⅱ Reanalysis data （R-2）, the main contributors to surface air temperature increase in southeast china were investigated by comparing trends of urban and rural temperature series, as well as observed and R-2 data, covering two periods of 1954-2005 and 1979-2005. Results from urban-rural comparison indicate that urban heat island （UHI） effects on regional annual and autumn minimum temperature increases account for 10.5% and 12.0% since 1954, but with smaller warming attribution of 6.2% and 10.6% since 1979. The results by comparing observations with R-2 surface temperature data suggest that land use change accounts for 32.9% and 28.8% in regional annual and autumn minimum temperature increases since 1979. Accordingly, the influence of land use change on regional temperature increase in southeast china is much more noticeable during the last 30 years. However, it indicates that UHI effect, overwhelmed by the warming change of background climate, does not play a significant role in regional warming over southeast china during the last 50 years.

关键词： southeast china urban heat island land use climate warming contributor

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Neoproterozoic Tectonic Setting of southeast china:New Constraints from SHRIMP U-Pb Zircon Ages and Petrographic Studies on the Mamianshan Group

引用

Acta Geologica Sinica(English Edition) 2010年第2期84卷 333-344页

作者： WU Ganguo YU Xinqi DI Yongjun ZHANG Da State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 China Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education China University of Geosciences Beijing 100083 China

Precambrian tectonic history of Zhejiaug, Fujian, and Jiangxi provinces of south china is important for understanding the tectonic evolution of South china but its magmatic activity, petrogenesis, stratigraphic sequence of the Mamianshan Group is still strongly controversial. Here we present new sensitive high resolution ion micro-probe （SHRIMP） U-Pb zircon geochronological data for the Mamianshan Group and petrographical data to constrain the tectonic framework of the regions. Our results showed that the SHRIMP U-Pb zircon age of green schists of the Dongyan Formation is 796.5±9.3 Ma, the Daling Formation is 756.2±7.2 Ma, and mica-quartz schist of the Longbeixi Formation is 825.5±9.8 Ma. These data indicate that the Mamianshan Group was formed not in the Mesoproterozoic, but in the Neoproterozoic and its stratigraphic sequences should be composed of Longbeixi, Dongyan, and Daling Formations from the bottom to the top. Rocks from this Group, from Zhejiang, Fujian and Jiangxi provinces, constituted the upper basement of the Cathaysia Block that overlay the lower basement of the Mayuan Group. Detailed petrographic studies demonstrate that the amphibole schists of the Dongyan Formation in the Mamianshan Group were formed within an intra-arc rift setting rather than a continental rift as previously suggested. Rather, this island-arc type formation was developed by collision and/or subduction between various blocks resulting from the breakup of the supercontinent Rodinia at c.850-750 Ma. The Zhuzhou conglomerate, distributed near Dikou Town, Jian＇ou City, Fujian Province and previously considered as evidence of the Mesoproterozoic Dikou movement, is shown here not to be the basal conglomerate above the angular unconformity between the upper and lower basements. Our conclusions have important implications for understanding the Precambrian tectonics of South china.

关键词： Intra-arc amphibole schist Dongyan Formation Zhuzhou conglomerate southeast china

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：