检索结果-南通市图书馆

中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Xuan-Ce Wang~(1,2,3*),Zheng-xiang li~2,Xian-Hua li~1,Qiu-li li~1,Guo-Qiang Tang~1,Qi-Rui Zhang~1,and Yu liu~1 1 State Key Laboratory of lithospheric Evolution,institute of geology and geophysics.chinese academy of sciences,P.O.Box 9825,Beijing 100029,China 2 institute for Geoscience Research,Department of Applied geology,Curtin University,GPO Box U1987,Perth,WA 6845,Australia 3 School of Earth and Environment,the University of Western Australia,Crawley,WA 6009,Australia

Low-δO signatures in supracrustal rocks have been used as geochemical proxies for cold paleoclimates,e.g.,*** low-δO values found in Neoproterozoic igneous rocks in parts of the South China Block have thus been genetically linked to Neoproterozoic glaciation ***,we report here new oxygen isotope compositions from Neoproterozoic magmatic zircons in central southern China using in-situ techniques that argue against such an *** results show that(1) low-δO magmatic zircons started to appear in the South China Block from ca.870 Ma,coinciding with the tectonic switching from Sibao orogenesis to postorogenic extension,which occurred more than 150 *** to the first glaciation *** most abundant low-δO magmatic zircons have ages of 800- 700 Ma.(2) The 830-700 Ma magmatic zircons are characterized by their bimodal nature of oxygen isotope compositions,i.e.,mantle-likeδO values(+4.4‰to +5.8‰) and high-δO values(+9.3‰to +10.8‰).(3) A sharp temporal change in maximum zirconδO values in the South China Block coincided with the onset of continental rifting and the possible arrival of a plume head.(4) No negativeδO zircons have been identified in this study,contrary to previous *** features strongly argue against a glaciation origin for low to negativeδO values in Neoproterozoic magmatic zircons from southern *** propose that two stages of high-temperature water-magma interaction during plume-driven magmatism and continental rifting best explain the low-δO *** most important implication of this study is that formation of such low-δO magmatic zircons was not necessarily related to glacial events and should not be used as a geochemical proxy for a cold paleoclimate.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

新疆北天山西段特马豆克期三叶虫

引用

古生物学报 1984年第4期 399-410页

作者：项礼文张太荣中国地质科学院地质研究所新疆区域地质调查大队

新疆北天山西段霍城精河博罗霍洛山一带奥陶纪地层虽颇为发育,但直到1974年新疆维吾尔自治区域地质调查大队与中国地质科学院组成的地层分队在野外才明确地将早奥陶世沉积划分出来,称为新二台群。1977年进一步划分出新二台组和凤沟组。1... 详细信息

新疆北天山西段霍城精河博罗霍洛山一带奥陶纪地层虽颇为发育,但直到1974年新疆维吾尔自治区域地质调查大队与中国地质科学院组成的地层分队在野外才明确地将早奥陶世沉积划分出来,称为新二台群。1977年进一步划分出新二台组和凤沟组。1979年许杰和黄枝高研究该区笔石化石后,认为下奥陶统从下而上应包括三个组:(1)新二台组,含Tetragraptus (Etagraptus) approximatus带,(2)凤沟组,含 Didy-

关键词：三叶虫特马豆克期眼叶项礼文头鞍沟眼脊面线前支间肋沟活动颊固定颊新疆北天山

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Timing of Anatexis within the Berere HTHP Complex Belt of Maevatanana Area,North-Central Madgascar,and its Geological Significance

引用

Acta Geologica Sinica(English Edition) 2020年第5期94卷 1393-1409页

作者： li Peng liU Shanbao li Jiankang SHI Guanghai liU xiang MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing 100083China Hunan Nuclear geology Changsha 410011China

The Berere HTHP Complex belt in Maevatanana area of north–central Madagascar formed in the^2.5 Ga orogeny and underwent high temperature(up to 1050℃)and high pressure(up to 11.5 kbar)granulite facies *** a widespread anatexis took place and numerous widely distributed felsic leucosomes *** majority of these leucosomes are parallel to the schistosity of the complex or are present as stockworks,as thin layers,or as lenses at different scales in the host ***,we report new petrographic data,zircon LA-ICP-MS U-Pb ages,and Lu–Hf isotopic data for felsic leucosomes within this ***,as identified by the petrological study of felsic leucosomes in the field and in thin sections,involved initial ternary feldspar exsolving to produce antiperthite and a quartz+plagioclase±K-feldspar+sericite mineral assemblage around feldspar grain *** is apparent along muscovite grain boundaries,and residual sericite is present around the margins of feldspar and quartz,all suggesting that anatexis was driven by reactions involving *** U–Pb dating indicates that the felsic leucosomes within the complex formed at 2467–2369 *** majority of samples have positiveεHf(t)values,although a few have negative values,suggesting their formation from magmas predominantly sourced from the depleted mantle,possibly with the involvement of minor amounts of crustal ***-stage Hf model ages andεHf(t)values for these samples are consistent with those for gneisses of the basement,indicating that the felsic leucosomes were formed by the anatexis of gneisses and both of their protolith formed during the formation of continental crust in Meso-Neoarchean(ca.3.1–2.7 Ga).As such,the crystallization age of the felsic leucosome(~2.4 Ga)represents the timing of regional anatexis and a change to post-orogenic *** this anatexis is also corresponds to the thermal event in Dharwar craton in India which has a pronounced similar Precambri

关键词： anatexis felsic leucosome U-Pb zircon dating Lu-Hf isotope Madagascar

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 *** species richness is currently concentrated in subtropical mid-low latitudes of the Northern Hemisphere,differing from the latitudinal diversity gradient mostly recognized in woody *** the present pattern was developing in Earth's past is still poorly studied,particularly in eastern ***,a new fossil species,Pinus shengxianica *** 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 *** comparison of extant and fossil members of Pinus suggests *** 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 *** morphological resemblance indicates these two extant low-latitude pines probably possess a close affinity with the present newly-discovered *** and originated from East Asian mid-low latitude ancestors during this generic re-diversification in the *** 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 *** 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

环渤海河流营养盐的向海输送及环境效应

引用

中国环境科学 2024年第1期44卷 178-192页

作者：孙策策刘军张爱军李梦露吴文涛臧家业冉祥滨自然资源部第一海洋研究所自然资源部海洋生态环境科学与技术重点实验室山东青岛266061 中国水产科学研究院黄海水产研究所农业农村部海洋渔业可持续发展重点实验室山东省渔业资源与生态环境重点实验室山东青岛266071 山东长岛近海渔业资源国家野外科学观测研究站山东烟台265800 崂山实验室海洋地质过程与环境功能实验室山东青岛266237 中国海洋大学海洋化学理论与工程技术教育部重点实验室山东青岛266100

对2017年枯水期、2019年丰水期、2020年丰水期和2021年丰水期环渤海24条主要入海河流溶解态无机营养盐向海输送的浓度、比值和通量进行了分析.结果表明:环渤海河流溶解无机氮(DIN)浓度在世界河流中处于较高水平,硝酸盐(NO_(3)^(-))为DI... 详细信息

对2017年枯水期、2019年丰水期、2020年丰水期和2021年丰水期环渤海24条主要入海河流溶解态无机营养盐向海输送的浓度、比值和通量进行了分析.结果表明:环渤海河流溶解无机氮(DIN)浓度在世界河流中处于较高水平,硝酸盐(NO_(3)^(-))为DIN的主要赋存形态,溶解硅(DSi)和溶解无机磷(DIP)浓度较低.环渤海河流每年向渤海输送约0.61Gmol氨盐(NH_(4)^(+))、0.24Gmol亚硝酸盐(NO_(2)^(-))、4.85Gmol NO_(3)^(-)、0.02Gmol DIP和3.27Gmol DSi.环渤海小河流在环渤海河流营养盐的向海输送中扮演着重要作用,尤其是DIP的输送可以占入海河流总通量的80%以上;小河流单位流域面积DIN、DIP和DSi输送通量均高于黄河.与世界河流相比,环渤海河流向海输送的营养盐比例失衡,具有高氮磷比、高硅磷比和低硅氮比的特点,磷限制显著.环渤海河流营养盐向海输送和结构失衡可能会进一步影响到渤海的初级生产和生态环境演变,值得深入研究.

关键词：环渤海河流营养盐营养盐结构通量渤海

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

Reply to Comment by Steinberger on 'Will Earth's next supercontinent assemble through the closure of the Pacific Ocean?'

引用

National Science Review 2022年第12期9卷 71-72页

作者： Chuan Huang Zheng-xiang li Nan Zhang Earth Dynamics Research Group The Institute for Geoscience Research (TIGeR) School of Earth and Planetary Sciences Curtin University Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space SciencesPeking University

Geo dynamic modeling of the super continent cycle crosses the fields of geology,geophysics and computational *** thus welcome the comment by *** from the numerical geodynamics point of view,which gives us the opportunity to clarify some of the concepts,explain further our model approach and necessary simplifications,and point out major ambiguities that require further work.

关键词： PLATE-TECTONICS EVOLUTION RHEOLOGY

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

土壤和地下水中重金属污染物迁移模型:以某有色金属冶炼厂为例

引用

Journal of Central South University 2024年第4期31卷 1092-1106页

作者：张海丽赵鹏高文艳肖保华杨雪枫宋磊冯翔郭林陆永平李海峰孙静 State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China College of Earth and Planetary sciences University of Chinese Academy of SciencesBeijing 101408China School of Metallurgy and Environment Central South UniversityChangsha 410083China Henan academy of geology Zhengzhou 450001China China Railway Seventh Bureau Group Nanjing Engineering Co. Ltd.Nanjing 210000China

冶炼厂表层土壤重金属污染严重。由于数据采集和计算量的限制,大多数数值模拟将土壤和地下水分开,这与实际情况不符。本文以某冶炼厂为研究对象,将土壤和地下水视为一个整体系统,建立了土壤-地下水反应性溶质迁移三维耦合数值模型,以定... 详细信息

冶炼厂表层土壤重金属污染严重。由于数据采集和计算量的限制,大多数数值模拟将土壤和地下水分开,这与实际情况不符。本文以某冶炼厂为研究对象,将土壤和地下水视为一个整体系统,建立了土壤-地下水反应性溶质迁移三维耦合数值模型,以定量表征重金属在土壤和地下水中的迁移规律。模型采用反应系数(λ)和滞留系数(R)来描述重金属的释放和吸附能力。模型结果与现场实际污染分布一致,表明土壤-地下水修复技术对严重污染土壤和局部污染地下水均有良好的修复效果。所构建的土壤-地下水反应性溶质迁移三维耦合模型很好地描述和预测研究地点重金属的分布和迁移扩散行为。

关键词：有色金属冶炼场重金属污染迁移和转化机制扩散通量预测修复技术模拟

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

Early-Middle Permian palynoflora of Shandong Province,eastern North China

引用

Journal of Palaeogeography 2020年第4期9卷 456-468页

作者： Tian-Tao Yin Shou-Jun li xiang-Yu Zhang Xiu-li Zhao College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590Shandong ProvinceChina China Chemical geology and Mine Bureau Shandong Geological Prospecting institute Ji'nan 250013Shandong ProvinceChina.

The Permian Taiyuan and Shanxi formations exposed in Shandong Province,eastern North China,contain abundant spores and *** this study,a total of 42 genera and 146 species of spores and pollen from these Permian formations,native to northern China,are identified and related to the three epochs of the Permian Period(Cisuralian,Guadalupian,and Lopingian Epochs)as two assemblages:Assemblage I—the Laevigatosporites-Granulatisporites assemblage,inferred as the Cisuralian(~298.9-272.9 Ma);and,Assemblage II—the Gulisporites-Sinulatisporites assemblage,inferred as the Guadalupian(~272.9-259.1 Ma).Assemblage I represents growing ferns,whereas Assemblage II represents *** assemblage division and analysis indicated that the palaeoclimate of the study area during Early-Middle Permian time was dominated by warm and humid conditions,and later in the Middle Permian changed into moderately dry conditions.

关键词： Permian Spores and pollen Vegetation succession Paleoclimate Environmental change Taiyuan Formation Shanxi Formation

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

赞皇杂岩翁城地区长城系常州沟组砂岩碎屑锆石U-Pb-Hf同位素研究

引用

岩石矿物学杂志 2024年第3期43卷 737-775页

作者：王乐乐刘平华周万蓬杜利林杨崇辉张文曹秋香陈丽梅东华理工大学地球科学学院江西南昌330013 中国地质科学院地质研究所北京100037 中国地质大学(北京) 北京100083

常州沟组是华北克拉通太古宙-古元古代变质基底上最早的沉积盖层之一,其碎屑锆石U-Pb年代学与Hf同位素特征分析对探讨长城系形成时代、源区特征以及基底演化均具有重要的研究意义。本文对华北克拉通中部赞皇杂岩瓮城地区长城系常州沟组... 详细信息

常州沟组是华北克拉通太古宙-古元古代变质基底上最早的沉积盖层之一,其碎屑锆石U-Pb年代学与Hf同位素特征分析对探讨长城系形成时代、源区特征以及基底演化均具有重要的研究意义。本文对华北克拉通中部赞皇杂岩瓮城地区长城系常州沟组底部砂岩样品进行了LA-ICP-MS碎屑锆石U-Pb定年和LA-MC-ICP-MS碎屑锆石Lu-Hf同位素分析。砂岩样品中碎屑锆石主要年龄峰值约为2 500 Ma,推断其碎屑物质主要来自于华北克拉通新太古代晚期变质基底,而最年轻的碎屑锆石年龄为1 822 Ma,结合赞皇杂岩变质基底普遍经历了1 850~1 800 Ma变质作用以及区域上上覆大红峪组火山岩中1 635 Ma结晶锆石年龄,限定瓮城地区长城系常州沟组沉积时代为1 800~1 635 Ma。砂岩样品中碎屑锆石的εHf(t)值变化于-6.8~+5.2之间,相应的两阶段模式年龄峰值约为2 820 Ma,结合赞皇杂岩已发表的2 900~2 700 Ma岩浆锆石和碎屑锆石Hf同位素结果,进一步表明2 900~2 700 Ma为赞皇杂岩地壳生长最主要的时期。综合太行山中南部地区已发表的长城系常州沟组的沉积学与新的年代学数据,推测赞皇杂岩瓮城地区长城系常州沟组沉积于陆内裂谷盆地。

关键词：华北克拉通赞皇杂岩常州沟组碎屑锆石 U-Pb-Hf同位素

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

Palynoflora and climatic dynamics of the Laizhou Bay of Bohai Sea,North China Plain,since the late middle Pleistocene

引用

Journal of Palaeogeography 2023年第2期12卷 278-295页

作者： Wen-Xia Wang Xiu-li Zhao Shou-Jun li Lei Zhang Xiao-li Wang xiang-Yu Zhang College of life sciences Linyi UniversityLinyi 276000Shandong ProvinceChina College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590Shandong ProvinceChina State Key Laboratory of Palaeontology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008Jiangsu ProvinceChina State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008Jiangsu ProvinceChina

The coastal plain of Laizhou Bay in Bohai Sea is a transitional area of land-sea *** in this area can bear significant information of sea-level fluctuation,climate change,as well as regional geological ***,in this study,new sporopollen data from three boreholes(GK138,GK111 and GK95)in the coastal plain of Laizhou Bay,Bohai Sea were investigated,and the pollen spectrum since the late middle Pleistocene was established as six sporopollen assemblage zones(Ⅰ-Ⅵ),i.e.,Pinus-Quercus-Artemisia,Gramineae-Artemisia-Chenopodiaceae,Picea-Pinus-QuercusArtemisia,Picea-Pinus-Betula-Gramineae-Artemisia,Picea-Pinus-Cupressaceae-Chenopodiaceae and *** with existing sedimentary successions and detailed radiocarbon dating results of the sediments from the three boreholes,paleovegetation and climatic evolution since the late middle Pleistocene were *** findings revealed that climatic changes in this area since the late middle Pleistocene were characterized by alternating cold-arid and warmhumid conditions,which were well correlated with marine isotopic stages(MIS).The present study offers specific insight into the climatic dynamics in the North China Plain since the late middle Pleistocene and provides evidence of a clear link among the palynoflora in the area,the glacial-interglacial period climatedriven sea-level changes,and the marineδ^(18)O records.

关键词： Laizhou Bay Late middle Pleistocene Pollen spectrum Palynoflora Climatic dynamics North China Plain

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：