检索结果-南通市图书馆

Late Holocene Moisture Changes in the Core Area of Arid Central Asia Reflected by Rock Magnetic Records of Glacier Lake Kalakuli Sediments in the Westernmost Tibetan Plateau and their Influences on the Evolution of Ancient Silk Road

引用

Acta Geologica Sinica(English Edition) 2020年第3期94卷 658-667页

作者： WU Xudong LIU Xingqi erwin appel College of Environmental Resources and Tourism Capital Normal UniversityBeijing 100048China School of Land Resources and Urban&Rural Planning Hebei Geo UniversityShijiazhuang 050031China Department of Geosciences University of TübingenTübingen 72076Germany

The evolution of Ancient Silk Road(ASR) was deeply influenced by late Holocene moisture changes in Arid Central Asia(ACA). Nevertheless, controversies in Holocene moisture change pattern of ACA and poorly–constrained age models of related studies have made the discussion about late Holocene moisture changes in ACA and their influences on the evolution of ASR difficult. Recently, a high–resolution age model during the late Holocene was established for Kalakuli Lake, a small glacier lake located in the core area of ACA. A thorough rock magnetic investigation was carried out on Kalakuli Lake sediments based on this age model. The magnetic mineral assemblage of Kalakuli Lake sediments is still dominated by primary magnetite despite minor diagenetic effects. Comparisons of rock magnetic records to parameters previously used as indicator of glacier fluctuations suggest that clastic input to Kalakuli Lake was high(low) and magnetic grain size is relatively larger(smaller), when glaciers on Muztagh Ata advanced(retreated). The ARM/SIRM ratio, a magnetic grain size proxy, is directly related to lake hydrodynamics, which are ultimately controlled by glacier fluctuations on Muztagh Ata as the result of regional moisture changes. Late Holocene moisture changes indicated by the ARM/SIRM ratio are consistent with cool/wet and warm/dry oscillations indicated by the unweighted average of biomarker hydrogen isotopic data of the C26 and C28 n–alkanoic acids in a previous study about Kalakuli Lake, most moisture change records of the core area of ACA and winter insolation of the Northern Hemisphere, but opposite to Asian monsoon evolution. Given Asian monsoon and the westerlies are mutually inhibited, we propose that late Holocene moisture changes in the core area of ACA were controlled by the intensity of Asian monsoon versus the westerlies under the governance of solar insolation. Generally increased moisture since the late Holocene indicated by the ARM/SIRM ratio favored cultural exchange and integration between the western and

关键词： moisture changes rock magnetic records Kalakuli Lake Arid Central Asia Ancient Silk Road

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

Environmental mechanism of magnetic susceptibility changes of lacustrine sediments from Lake Hulun, China

引用

Science China Earth Sciences 2000年第5期43卷 534-540页

作者：胡守云王苏民 erwin appel 吉磊 Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China Institut fur Geologie und Palaontologie Universitat Tubingen Tubingen 72076 Germany

The changes of magnetic susceptibility (κ) are correlated with those of corresponding sedimentological, geochemical, mineralogical and biological results, which verifies that κ can be taken as one of the environmental proxies. However, usually the exact origin of magnetic signal is poorly understood, and is difficult to relate with the environmental evolution. Magnetic properties of material derived from the catchment and sedimentary environment may affect the accumulation, preservation, or authigenesis and diagenesis of magnetic minerals. In the Lake Hulun region in Inner Mongolia, it is found that muddy sediments, deposited during high water level period (corresponding to humid climate), have comparatively high κ values. In contrast, the sandy sediments, deposited during low water level period (corresponding to arid climate), have low κ values. Detailed rock magnetic investigation confirms that detrital magnetite derived from volcanic rocks in the catchment exists in both muddy and sandy

关键词： lacustrine sediment magnetic susceptibility environmental magnetism ferrimagnetic iron sulphide Lake Hulun.

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

Magnetic Properties of Tree Leaves and Their Significance in Atmospheric Particle Pollution in Linfen City,China

引用

Chinese Geographical Science 2013年第1期23卷 59-72页

作者： YIN Gang HU Shouyun CAO Liwan Wolfgang ROESLER erwin appel State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of Sciences University of Chinese Academy of Sciences Institute for Geosciences University of Tübingen

Fifty-one tree leaves were sampled in the industrial area,residential area,and Fenhe River ecological zone,for the purpose of a magnetic study on atmospheric pollution in Linfen City,Shanxi Province,China.Measurements of mass-specific magnetic susceptibility(χ) show a significant variation range(from 11.6 × 10-8 m3/kg to 129.7 × 10-8 m3/kg).Overall values of magnetic susceptibility decline in the following sequence:industrial area > residential area > Fenhe River ecological zone.The relatively elevated concentration-related magnetic parameters(saturation isothermal remanent magnetization,anhysteretic remanent magnetization and magnetic susceptibility) appear in the industrial area,with their highest values in the vicinity of Linfen Steel Mill.Magnetic particles are dominated by multidomain,magnetite-like minerals.Magnetic particle concentration and grain size both decrease with the increasing distance from industrial area,indicating the industrial area,especially Linfen Steel Mill,is the main source of atmospheric particle pollution.Residential area and Fenhe River ecological zone are also affected by industrial emission to a certain extent.The results of this study indicate that magnetic measurements of tree leaves are practicable for monitoring and determination of atmospheric pollution in Linfen City.

关键词：大气颗粒物污染磁学性质临汾市中国树叶饱和等温剩磁大气污染工业区

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

Magnetic characteristics and its environmental implications of core YSJD-86GC sediments from the southern South China Sea

引用

Chinese Science Bulletin 2014年第25期59卷 3176-3187页

作者： Tingping Ouyang Chengjing Tian Zhaoyu Zhu Yan Qiu erwin appel Shuqing Fu Key Laboratory of Marginal Sea Geology Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou Marine Geological Survey University of Tuebingen Tuebingen 72076 Germany Guangzhou Institute of Geography

Sediments of core YSJD-86GC(referred to as86GC)collected from the southern South China Sea were selected for environmental magnetic studies.Combined with the published chronological framework,sediment magnetic properties were revealed for the study area since the MIS3 stage.The rock magnetic results indicate that low-coercivity magnetite is the main magnetic mineral within the sediments.Also,a certain amounts of hematite are present.The King plot and Day plot,which reflect the magnetic particle size,show that fine-grained pseudo-single-domain phase magnetic particles dominate the magnetic minerals in the sediments.Comparison of magnetic parameters and geochemical indicators show that magnetic properties of core 86GC sediments reflect a terrigenous input.Simultaneously,magnetic characteristics of the studied sediment are influenced by the quantity of terrigenous sediment input,oxidation-reduction conditions of the provenance area,and the transportation environment and distance.Sea level fluctuation caused by global climate change was the main factor for variation in concentration of magnetic minerals and magnetic particle size of thestudied core sediments.Thus,variation of sediment magnetic properties in the study area can be used as an indirect indicator of sea level fluctuation.

关键词：柱状沉积物环境磁学中国南海磁特性海平面波动磁性矿物地球化学指标氧化还原条件

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

Deep Drilling Campaign in the Western Qaidam Basin,NE Tibetan Plateau and their Revealed Global Temperature Forcing of Salt Formation in the Late Miocene-Quaternary

引用

Acta Geologica Sinica(English Edition) 2014年第S1期88卷 216-217页

作者： FANG Xiaomin LI Minghui erwin appel WANG Jiuyi HAN Wenxia ZHANG Weilin YANG Yibo CAI Maotang Key Laboratory of Continental Collision and Plateau Uplift & Institute of Tibetan Plateau Research Chinese Academy of Sciences Department of Geosciences University of Tübingen Key Laboratory of Salt Lake Resources and Chemistry & Qinghai Institute of Salt Lakes Chinese Academy of Sciences

The Qaidam Basin in the NE Tibetan Plateau has contributed the largest amount of potash in China.However,how the potash was formed has long been a subject of debate.Here we carried out a deep drilling

关键词： SG Deep Drilling Campaign in the Western Qaidam Basin,NE Tibetan Plateau and their Revealed Global Temperature Forcing of Salt Formation in the Late Miocene-Quaternary NE

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

引用

2022年中国地球科学联合学术年会

作者： Qi Zhang erwin appel Shouyun Hu Nathani Basavaiah Helge Stanjek James Byrne Southern University of Science and Technology University of Tuebingen Nanjing Institute of Geography and Limnology Indian Institute of Geomagnetism Navi RWTH Aachen University University of Bristol

Maghemitization of magnetite is an important topic in rock magnetism. It happens as low-temperature oxidation (LTO) under normal atmospheric conditions, causing gradual transformation of magnetite to maghemite, and potentially culminating in transformation to hematite. Better understanding of how humidity and temperature affect LTO is of great interest for paleoclimate studies, which use magnetic properties as proxies.

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

Heavy metal pollution in farmland irrigated with river water near a steel plant——magnetic and geochemical signature

Heavy metal pollution in farmland irrigated with river water...

引用

中国科学院地质与地球物理研究所2013年度（第13届）...

作者： Chunxia Zhang erwin appel Qingqing Qiao State Key Laboratory of Litho spheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of Sciences Department of Geosciences University of Tuebingen

The presence of heavy metals(HMs) in the environment is a major threat for humans.Magnetic proxies provide a rapid method for assessing the degree of HM pollution in environment. We have studied farmland soil irrigated with polluted river water in the vicinity of a steel plant in Loudi city(Hunan Province,China) to test the efficiency of magnetic methods for detecting the degree of HM pollution.Both magnetic and non-magnetic(microscopic,chemical and statistical) methods were used to characterize these farmland soils.Enhanced magnetic concentration values were found in the upper arable soil horizon(0-20 cm),which is related to the presence of spherical～10 to 30μm sized magnetite particles.The spatial distribution of magnetic concentration and HM contents in the farmland soils matches with the spatial pattern of these parameters in river sediments.These findings provide evidence that HM pollution of the farmland soil is mainly caused by irrigation with wastewater.HMs Zn,Pb,Cu,Cd,Co, Ni,V are well correlate with magnetic susceptibility(χ).The pollution load index(PLI) of all nine anthropogenic HMs(including also Cr and Mo) and log(χ) are significantly correlated. Using the resulting linear PLI-log(χ) function,values ofχcan serve as a convenient tool for semi-quantifying the degree of HM pollution in the uppermost～20 cm of the studied farmland Soils.These findings suggest that magnetic methods can generally serve as a convenient tool for detecting and mapping HM pollution in farmland soil irrigated with wastewater from sites nearby heavy industrial activities.

关键词： Environmental magnetism Rock and mineral magnetism Asia

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

Discriminating sources of anthropogenic heavy metals in urban street dusts using magnetic and chemical methods

Discriminating sources of anthropogenic heavy metals in urba...

引用

中国科学院地质与地球物理研究所2012年度（第12届）...

作者： Chunxia Zhang Qingqing Qiao erwin appel Baochun Huang State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of Sciences

Discriminating between different sources of natural and anthropogenic pollution is a topic of scientific interest, but also important for sociopolitical and economic reasons.To contribute to potential application of magnetic measurements for evaluating industrial pollution in urban environment from multi-anthropogenic sources,characteristics of street dust from a typical fast developing industrial city(Loudi,Hunan province, China) were studied by magnetic and non-magnetic(microscopic,chemical and statistical) methods.Anthropogenic magnetic spherules and iron from a Fe-smelting plant and traffic-related angular-shaped particles were identified.Heavy metals originate from different anthropogenic activities;Fe,Co,and Mo from the Fe-smelting plant;Cu and Ni from vehicle traffic;Pb,Zn and Cd from both above anthropogenic sources;Cr,Ni and Be from other anthropogenic activities.The degree of heavy metal pollution in street dust is controlled by locations of anthropogenic activities and main wind directions.Although correlation of the Tomlinson pollution load index of anthropogenic heavy metals with mass-specific magnetic susceptibility (χ) values is only moderate,our study demonstrates that magnetic proxies provide a rapid means for detecting and outlining regions with possible higher heavy metal contamination caused by multianthropogenic pollution sources in urban cities.

关键词： Environmental magnetism Heavy metals Street dust Multi anthropogenic activities Hunan China

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

中亚造山带东段晚古生代-早中生代构造演化的古地磁约束

中亚造山带东段晚古生代-早中生代构造演化的古地磁约束

引用

2020年中国地球科学联合学术年会

作者：赵盼徐备 Yan Chen Michel Faure erwin appel 中国科学院地质与地球物理研究所北京大学法国奥尔良大学德国图宾根大学

中亚造山带作为显生宙最大的增生型造山带,记录了西伯利亚、东欧、塔里木和华北克拉通之间的古亚洲洋长期俯冲、增生和碰撞造山过程。中亚造山带东段位于华北克拉通北缘,以多块体、多期次逐渐拼贴于华北克拉通为特征。然而,各块体与华...

中亚造山带作为显生宙最大的增生型造山带,记录了西伯利亚、东欧、塔里木和华北克拉通之间的古亚洲洋长期俯冲、增生和碰撞造山过程。中亚造山带东段位于华北克拉通北缘,以多块体、多期次逐渐拼贴于华北克拉通为特征。然而,各块体与华北克拉通的拼贴时间仍存在很大争议。为解决这一争议,我们分别对内蒙古板块和蒙古板块之上石炭纪-二叠纪地层进行古地磁学研究。

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

柴达木盆地西部SG-1钻孔磁性地层学与环境磁学意义

柴达木盆地西部SG-1钻孔磁性地层学与环境磁学意义

引用

中国地球物理学会第二十八届年会

作者：张伟林方小敏 erwin appel 颜冒都宋春晖中科院青藏高原研究所 Department of Geosciences University of TübingenTübingenGermany 兰州大学地质学与矿产资源学院&西部环境教育部重点实验室

＜正＞柴达木盆地即青藏高原东北部最大的山间盆地自新生代以来连续沉积了巨厚的湖相沉积物,其完整的保存了新生代以来周边山区的剥蚀历史和环境变迁信号。柴达木盆地西部察汗斯拉图钻孔（SG-1）938.5米沉积物主要为灰黑色泥岩、灰色粉...

＜正＞柴达木盆地即青藏高原东北部最大的山间盆地自新生代以来连续沉积了巨厚的湖相沉积物,其完整的保存了新生代以来周边山区的剥蚀历史和环境变迁信号。柴达木盆地西部察汗斯拉图钻孔（SG-1）938.5米沉积物主要为灰黑色泥岩、灰色粉砂岩,其上部含有大量的灰白色石盐和膏盐;磁性地层学结果表明其

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

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：