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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

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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 e

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

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

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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 thatκ 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 highκ values. In contrast, the sandy sediments, deposited during low water level period (corresponding to arid climate), have lowκ values. Detailed rock magnetic investigation confirms that detrital magnetite derived from volcanic rocks in the catchment exists in both muddy and sandy sediments. During high water level period, secondary ferrimagnetic iron sulphide was produced in muddy sediments under relatively reductive conditions. Ferrimagnetic iron sulphide, coexisting with detrital magnetite, predominates the magnetic properties of muddy sediments, resulting in increasingκ. This paper reveals the significance of authigenic ferrimagnetic iron sulphide produced after sediment deposition.

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

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

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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,*** 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 *** 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 *** particles are dominated by multidomain,magnetite-like *** 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 *** area and Fenhe River ecological zone are also affected by industrial emission to a certain *** 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： tree leaves environmental magnetism atmospheric particulate matter environmental pollution Linfen City China

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

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Chinese Science Bulletin 2014年第19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 *** with the published chronological framework,sediment magnetic properties were revealed for the study area since the MIS3 *** rock magnetic results indicate that low-coercivity magnetite is the main magnetic mineral within the ***,a certain amounts of hematite are *** 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 *** of magnetic parameters and geochemical indicators show that magnetic properties of core 86GC sediments reflect a terrigenous ***,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 *** 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 ***,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

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临汾市树叶磁性的时空变化特征及其对大气重金属污染的指示

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地球物理学报 2016年第5期59卷 1729-1742页

作者：曹丽婉胡守云 appel erwin 师尚礼尹刚德国图宾根大学地球科学系地球物理实验室德国72076 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室南京210008 草业生态系统教育部重点实验室(甘肃农业大学) 兰州730070

粉煤灰经工厂废气排放进入大气,对人类健康和生态系统都造成了无法弥补的破坏.本文选取具有高空间分辨率优势的树叶作为收集粉煤灰的载体,对临汾市大气中可吸入颗粒物进行磁学参数和重金属含量监测.结果表明,磁化率最大值出现在工厂污... 详细信息

粉煤灰经工厂废气排放进入大气,对人类健康和生态系统都造成了无法弥补的破坏.本文选取具有高空间分辨率优势的树叶作为收集粉煤灰的载体,对临汾市大气中可吸入颗粒物进行磁学参数和重金属含量监测.结果表明,磁化率最大值出现在工厂污染源附近,磁化率空间分布呈现随污染源距离增加而降低的趋势.工业区收集到的磁性颗粒以低矫顽力、粗粒度的磁铁矿为主.夏季磁性矿物来源单一,主要为人为影响.冬季大气中悬浮的磁性颗粒有部分来自于西北风/北风的自然尘降.同一采样点磁化率随时间变化特征表明,树叶的磁学性质可以灵敏和有效地反映较短时期内大气污染的现状.统计分析表明磁化率和重金属元素(铁,铬,镍,铜,铅,钴)之间存在显著相关性.污染负荷指数用于评估研究区域内重金属各元素综合污染的程度.结果显示,在废弃的旧工业区附近无大气污染指示,但在运营中的工厂集中的地区,大气均受到严重污染.污染负荷指数与表征磁性矿物含量的磁化率呈相关性(r2=0.66),因此树叶的磁性参数可以作为大气重金属污染的替代指标.

关键词：环境磁学粉煤灰重金属污染污染负荷指数临汾市

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Uranium distribution in the lacustrine calcareous clastic-evaporite sequence in the western Qaidam Basin,and implications for U behavior in concentration of closed water

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 168-169页

作者： YANG Yibo FANG Xiaomin LI Minghui appel erwin ZHANG Weilin LIU Xiaoming Key Laboratory of Continental Collision and Plateau uplift Institute of Tibetan Plateau Research Chinese Academy of Sciences Paleoenvironmental Dynamics Group Institute of Geosciences Goethe University Frankfurt Altenhferallee 1

Uranium(U)provides especially useful information for reconstructing paleoredox conditions due to its unique geochemical properties and behavior in supergene *** proxy potential under suboxic-oxic

关键词： Uranium Paleoredox conditions Lacustrine sediments Evaporite Qaidam Basin

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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

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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 ***,how the potash was formed has long been a subject of *** 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

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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...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

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 *** 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 *** magnetic and non-magnetic(microscopic,chemical and statistical) methods were used to characterize these farmland *** 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 *** spatial distribution of magnetic concentration and HM contents in the farmland soils matches with the spatial pattern of these parameters in river *** findings provide evidence that HM pollution of the farmland soil is mainly caused by irrigation with *** 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 *** 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

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

Discriminating sources of anthropogenic heavy metals in urba...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

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 *** 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) *** magnetic spherules and iron from a Fe-smelting plant and traffic-related angular-shaped particles were *** 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 *** degree of heavy metal pollution in street dust is controlled by locations of anthropogenic activities and main wind *** 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

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作者： Qi Zhang erwin appel Shouyun Hu Nathani Basavaiah Helge Stanjek James Byrne

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, wh

关键词： Humidity related magnetite low-temperature oxidation

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