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Magnetic characteristics of lake sediments in Qiangyong Co Lake,southern Tibetan Plateau and their application to the evaluation of mercury deposition

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Journal of Geographical Sciences 2020年第9期30卷 1481-1494页

作者： GAO Xing KANG Shichang LIU Qingsong CHEN Pengfei duan zongqi State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesCASLanzhou 730000China Departme nt of Ocea n Scie nee and Engin eeri ng Souther n Un iversity of Science and Tech no logyShe nzhen 518055GuangdongChina The Geographical Society of China Beijing 100101China

Heavy metals,one of the most toxic classes of pollutants,are resistant to degradation and harmful to the biological *** lakes that have developed on the Tibetan Plateau are ideal regions to investigate historic heavy metal pollution,particularly through the use of the reliable 210 Pb dating *** magnetism has been successfully applied to estimate heavy metal pollution in different environmental systems due to its characteristics of simple processing steps,good sensitivity,and ***,it has not yet been applied to assess heavy metal pollution in lake sediments on the Tibetan Plateau.A series of environmental magnetic investigations of Qiangyong Co Lake sediments(southern Tibetan Plateau) was therefore conducted to explore the relationship between magnetic minerals and mercury(Hg) *** results showed that the magnetic mineral species in lake sediments remained stable,with similar levels of four different components from 1899 to ***,the proportion of component 1(C1,hematite) increased continuously with the corresponding decrease in the proportion of C2(goethite),while the proportions of C3 and C4(magnetite) did not change *** a result,the bulk magnetic signals(e.g.,SIRM and clf) were unsuitable for the evaluation of the Hg concentration;however,the proportion of hematite had a strong positive correlation with the Hg *** is possible that the Qiangyong Glacier(the main water supply for Qiangyong Co Lake) has experienced faster melting with global and local warming,and the Hg trapped in cryoconite and ice was ***,with a large specific surface area,has a strong capacity for absorbing Hg,and both materials are ultimately transported to Qiangyong Co *** proportion of hematite in a sample is therefore a suitable semi-quantitative proxy that can be used to evaluate the Hg concentration in Qiangyong Co Lake *** study confirmed that the variation of

关键词： southern Tibetan Plateau Qiangyong Co Lake environmental magnetism mercury(Hg)deposition

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S-wave velocity of the crust around Tianshan Mountains inverted from seismic ambient noise tomography

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Chinese Science Bulletin 2010年第31期55卷 3590-3598页

作者： GUO Zhi GAO Xing WANG WeiMin LI GuiLin duan zongqi SHI Heng Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100085 China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

We process ambient noise data from seismic stations deployed in central Asia to determine the crustal shear wave velocity structure beneath the Tianshan Mountians and surrounding *** 748 inter-station Rayleigh wave empirical Green's functions have been recovered to estimate the phase velocity dispersions over periods from 6 to 50 s using the image transformation *** show that for short periods(6-20 s),the distribution of Rayleigh wave phase velocities is generally consistent with surface geology,with high velocities corresponding to mountain ranges and low velocities to sedimentary *** two profiles,which trend from NE-SW and NW-SE,the shear wave velocity shows a pair of high velocity anomalies dipping in opposite directions beneath the Tianshan *** shallow depths,those high velocity anomalies roughly correlate with areas where the mountain front and the surrounding basin are *** profiles also show a narrow zone beneath the Tianshan Mountains,which may represent a route for the upwelling from upper *** observations suggest that the underthrusting of the Tarim Basin and Kazakh Shield combine with the weakness of the crust,which is heated by the upwelling from upper mantle,may play an important role on the reactivation of the Tianshan Mountains associated with the India-Eurasia collision.

关键词：天山山地 S波速度环境噪声地震断层地壳周边地区沉积盆地速度异常

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Mechanism of magnetic property changes of serpentinites from ODP Holes 897D and 1070A

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Science China Earth Sciences 2015年第4期58卷 815-829页

作者： SU Kai LIU QingSong JIANG ZhaoXia duan zongqi Division of Tethys Research Center Institute of Geology and Geophysics Chinese Academy of Sciences College of Earth Sciences University of the Chinese Academy of Sciences

Serpentinites have great implications for the oceanic crust, subduction zones, island arc magmatism activity, and the formation of nickel ore deposits. To further determine the mechanism of magnetic property changes of serpentinites, samples from ODP Holes 897 D and 1070 A were investigated by integrating both magnetic and non-magnetic methods. Detailed rock magnetic results demonstrate that magnetite prevails in the entire serpentinite section, while maghemite is present in the upper and altered parts. The concentration of Fe in the fresh peridotite is inhomogeneous; nonetheless, the magnetic properties are generally determined by the serpentinization process. The formation and state of the magnetite depend on the fracture conditioning and fluid activities which are controlled by the serpentinization process. By comparing these two holes, we found that the production of magnetite is consistent with the serpentinization process; serpentinization is a multi-stage process which involves early high-temperature serpentinization and later low-temperature oxidation. As the serpentinization continues, the fine magnetic particles become coarser, combined with the formation of new SP particles, and the later low-temperature oxidation leads to the maghemitization of the magnetites. The duration of oxidation also contributes to the differences of remanent magnetization between these two holes. These results greatly improve our understanding of the magnetic enhancement during the serpentinization process, and provide constraints on the interpretation of the paleomagnetic and aeromagnetic anomalies in this area.

关键词： magnetite maghemite serpentinization ODP Holes 897D 1070A

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Magnetic characteristics of insoluble microparticles in ice core (Nojingkangsang) from the southern Tibetan Plateau and its environmental significance

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Science China Earth Sciences 2011年第10期54卷 1635-1642页

作者： duan zongqi GAO Xing LIU QingSong XU BaiQing SU YouLiang Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100085 China State Key Laboratory of Resources and Environmental Information System Institute of Geographical Sciences ＆ Natural Resources Research Chinese Academy of Sciences Beijing 100101 China State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

Insoluble microparticles in ice cores are related closely to the transportation of eolian dust,and thus are important natural media to reconstruct climate *** this study,we conducted a systematic mineral-magnetic investigation of insoluble microparticles in the Nojingkangsang ice core (29°2.1'N,90°11.88'E,5950 m) from the Southern Tibetan *** indicate that the dominant magnetic mineral is magnetite,and its concentration has grown significantly since the 1980s,which coincides with trends in climate warming of the Tibetan *** by regional warming,the glacial recession around Nojingkangsang shortens the distance between the dust source and glacial areas and thus increases the concentration of coarse-grained magnetic minerals in ice ***,the frequency of dust storms,associated with annual precipitation,could play only a regulatory role on the magnetic content over yearly (or seasonal) time ***,using a new approach,the magnetic index of insoluble microparticles in ice cores of this region is seen as mainly reflecting trends in climate warming.

关键词： Nojingkangsang insoluble microparticles rock magnetism SIRM climate warming

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Magnetism of the Huguangyan Maar Lake sediments, Southeast China and its paleoenvironmental implications

Magnetism of the Huguangyan Maar Lake sediments, Southeast C...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： zongqi duan Qingsong Liu Xiaoqiang Yang Xing Gao Youliang Su State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences Department of Earth Sciences Sun Yat-Sen University State Key Lab of Resources and Environmental Information System Institute of Geographical Sciences & Natural Resources ResearchChinese Academy of Sciences

The Huguangyan(HGY) lake, a typical maar lake in the southeast of China, is sensitive to the evolution of the Asian monsoon system, including the East Asian summer monsoon(EASM) and the Indian summer monsoon(ISM). So far, the mechanism of how magnetic properties of the HGY lake sediments respond to climate changes has not been well determined. In this study, we performed a detailed mineral-magnetic analysis on the highresolution HGY sediments. Results revealed that finer-grained magnetite(superparamagnetic and single domain magnetite mixed with a small amount of goethite and hematite) is the dominant magnetic mineral, which is consistent with the magnetic properties of the red weathered soils collected from the catchments, but differs greatly from that of the aeolian inputs. Therefore, magnetic minerals of the HGY sediments were originated mainly from the lake catchment, rather than the wind-blown dust inputs. Considering the high tephra wall(relative elevation of 10–20 m) and great precipitation, surface runoff by rainfall is interpreted as the main process to transport red soils into the lake. The magnetic records of HGY sediments revealed that the summer monsoon was enhanced at the early Holocene and then declined abruptly at the mid-late Holocene(.5 kyr cal. BP). This pattern strongly mimics the evolution pattern of ISM, but is inconsistent with the EASM. Thus, we suggest that the magnetic records from HGY have the great potential to investigate the evolution of ISM.

关键词： Huguangyan Magnetic minerals Lake catchment Indian summer monsoon

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中国地理资源期刊集群平台期刊特约专栏实施成效分析与启示

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中国科技期刊研究 2021年第7期32卷 889-894页

作者：段宗奇何书金中国科学院地理科学与资源研究所《地理学报》编辑部 100101 中国地理学会 100101

【目的】依据中国地理资源期刊集群平台期刊特约专栏出版实践,分析实施成效,总结出版经验,为同行组织特约专栏提供借鉴。【方法】采用中国知网的统计数据,分析中国地理资源期刊集群7种平台期刊在2016—2017年刊发的特约专栏的表现。【... 详细信息

【目的】依据中国地理资源期刊集群平台期刊特约专栏出版实践,分析实施成效,总结出版经验,为同行组织特约专栏提供借鉴。【方法】采用中国知网的统计数据,分析中国地理资源期刊集群7种平台期刊在2016—2017年刊发的特约专栏的表现。【结果】特约专栏整体上能够提高期刊影响力,推广学术传播,但不同类型的特约专栏的表现存在差别。【结论】内容型专栏是提升期刊影响力的有效措施,双盲评审、相似主题的间隔时间及同一作者的出现频次是特约专栏成效的重要影响因素。特约专栏的组织需要与科技创新一致,落实"四个面向"的战略部署。

关键词：中国地理资源期刊集群特约专栏影响因子下载率成效分析

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Mechanism of variations in environmental magnetic proxies of lake sediments from Nam Co, Tibet during the Holocene

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Chinese Science Bulletin 2013年第31期58卷 1568-1578页

作者： SU YouLiang GAO Xing LIU QingSong HU PengXiang duan zongqi JIANG ZhaoXia WANG JunBo ZHU LiPing DOBERSCHüTZ Stefan MUSBACHER Roland DAUT Gerhard HABERZETTL Torsten Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau ResearchChinese Academy of Sciences State Key Laboratory of Lithospheric Evolution (SKL-LE) Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences Institut für Geographie Friedrich-Schiller-Universitt

High-resolution environmental records from the Tibetan Plateau are essential to understand past global climatic and environmental changes. Magnetic minerals in lake sediments are important proxies to reconstruct environmental and climatic changes. Nam Co (lake) is a typical great lake in the transitional region of southwest monsoon in the Tibetan Plateau. Previous studies have extensively focused on geochemistry, microfossils, sedimentology and biochemistry analysis of Nam Co, which provides sound interpretation of paleoclimatic and paleoenvironmental changes. However, up to now, no systematic environmental magnetic studies have been carried out. Therefore, high-resolution and systematic magnetic studies combined with geochemical parameters were carried on lake sediments of core NC 08/01 from Nam Co for the Holocene period (11.3 cal ka BP) in order to explore how magnetic properties of the sediments respond to climatic changes. Based on variations of magnetic proxies, the sequence can be separated into 3 units. Unit 1 (236-199 cm, 11.3-7.8 cal ka BP) contains dominantly coarse-grained magnetite with homogeneous grain size. A positive correlation between magnetite and Ti strongly suggests that these coarse-grained detrital magnetites reflect detrital input signals due to insignificant effects of postdepositional dissolution processes on these coarse-grained magnetite particles. For Unit 2 (198-102 cm, 7.8-2.1 cal ka BP), magnetic grain size is finer and the corresponding concentration of magnetite is also reduced. This is mainly due to significant dissolution of these fine-grained detrital magnetite particles, which were transported under reduced water flow conditions during this period. For Unit 3 (101-0 cm, 2.1-0 cal ka BP), the bulk magnetic properties are dominated by a mixture of single domain biogenic magnetite and detrital magnetite. The concentration of magnetic minerals is not correlated with the Ti content. In conclusion, the preservation of magnetic minera

关键词：湖泊沉积物沉积物环境西藏纳木错代理机制全新世地球化学参数微体古生物化石古环境变化

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1899—2011年青藏高原南部枪勇错沉积物磁性矿物的环境意义

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地理学报 2020年第1期75卷 68-81页

作者：高星康世昌刘青松陈鹏飞段宗奇中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室北京100101 中国科学院西北生态环境资源研究院冰冻圈与全球变化研究室兰州730000 南方科技大学海洋科学与工程系深圳518055 中国地理学会北京100101

重金属污染物因具有持久性和难降解性,严重影响生态系统健康。青藏高原湖泊远离人类污染区,是研究人类污染物远端效应的理想区域。基于定年数据,湖泊沉积物可以追踪近百年内的人类污染物变化趋势。环境磁学具有经济、快捷和无损耗的特点... 详细信息

重金属污染物因具有持久性和难降解性,严重影响生态系统健康。青藏高原湖泊远离人类污染区,是研究人类污染物远端效应的理想区域。基于定年数据,湖泊沉积物可以追踪近百年内的人类污染物变化趋势。环境磁学具有经济、快捷和无损耗的特点,被广泛证实可以有效指示重金属污染;但目前还缺乏对青藏高原湖泊沉积物中的相关环境磁学研究。为此,选取青藏高原南部枪勇错1899-2011年的沉积物,进行系统的环境磁学分析,探讨磁性矿物与重金属Hg的相关关系及环境指示意义。结果表明:1899-2011年磁性矿物的类型没有发生变化,可分为4类组分,其中:组分C1(赤铁矿)占比不断增多,C2(针铁矿)占比相应减少,C3和C4(磁铁矿)的占比基本保持不变。样品的饱和等温剩磁和低频磁化率与Hg含量相关性较低。然而C1组分与Hg含量呈现良好的正相关关系。本文认为在近百年全球和青藏高原气温不断增高的趋势下,枪勇错的主要补给--枪勇冰川融化加速,导致原来被冰川或冰尘封存的人类污染产生的Hg重新释放。在这个过程中,C1(赤铁矿)组分因表面积大而易于富集Hg,最终二者一同随融水进入到枪勇错。本研究表明,环境磁学可以应用于青藏高原南部湖泊的重金属研究,并为揭示Hg在青藏高原南部湖泊中的富集过程提供新的视角。

关键词：青藏高原南部枪勇错湖泊沉积环境磁学环境变化

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海洋岩石圈磁结构及动力学

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热带海洋学报 2016年第1期35卷 38-47页

作者：刘青松刘建兴段宗奇中国科学院地质与地球物理研究所特提斯研究中心北京100029 中国科学院大学北京100049

古地磁学在20 世纪极大地促进了板块构造理论的诞生和全球大洋钻探计划的发展.对洋壳的磁性研究是这场地学革命的突破点之一.从磁学性质上, 洋壳磁性包括洋壳中所含磁性矿物本身的性质以及这些矿物携带的古地磁信息.从介质性质上, 洋壳... 详细信息

古地磁学在20 世纪极大地促进了板块构造理论的诞生和全球大洋钻探计划的发展.对洋壳的磁性研究是这场地学革命的突破点之一.从磁学性质上, 洋壳磁性包括洋壳中所含磁性矿物本身的性质以及这些矿物携带的古地磁信息.从介质性质上, 洋壳包含下部岩石层（包括枕状玄武岩、辉长岩和橄榄岩）和上部沉积物.文章首先总结洋壳的磁性结构,并对其代表的动力学意义进行深入探讨, 主要包括应用磁异常条带进行年代学、地球深部动力学、大洋洋壳的板块运动学以及热点演化等研究, 详细总结了国内相关研究中南海洋壳的磁性研究进展.最后对研究中遇到的相关难点和关键科学问题进行了回顾与展望.

关键词：洋壳磁异常条带古地磁学地球动力学南海

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现代黄河三角洲沉积物磁性地层年代框架及环境磁学研究

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地球物理学报 2019年第5期62卷 1772-1788页

作者：王琬璋周良勇段宗奇姜兆霞刘建兴刘青松中国科学院地质与地球物理研究所岩石圈演化国家重点实验室北京100029 中国科学院大学北京100049 中国地质调查局青岛海洋地质研究所青岛266071 中国地质调查局滨海湿地生物地质重点实验室青岛266071 青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室青岛266237 中国海洋大学海洋地球科学学院海底科学与探测技术教育部重点实验室青岛266100 国家海洋局第一海洋研究所青岛266061 南方科技大学海洋科学与工程系深圳518055

本文对黄河三角洲Z07孔沉积物进行了系统的磁性地层学和环境磁学研究.通过结合沉积速率和古地磁长期变化数据,我们为该孔建立了较为精确可信的年代框架(1999-03—2006-06A.D.).环境磁学结果表明黄河三角洲沉积物与中国黄土的磁学特征相... 详细信息

本文对黄河三角洲Z07孔沉积物进行了系统的磁性地层学和环境磁学研究.通过结合沉积速率和古地磁长期变化数据,我们为该孔建立了较为精确可信的年代框架(1999-03—2006-06A.D.).环境磁学结果表明黄河三角洲沉积物与中国黄土的磁学特征相似,主要载磁矿物为单畴(SD)磁铁矿,超顺磁颗粒(SP)含量也较高.整体上,该孔沉积物磁学参数的变化主要受粒度和含量控制.岩芯磁性参数在2003年前后发生了系统变化.我们认为,黄河自2002年起进行调水调沙工程,黄河下游河道冲刷加剧,形成新的物质来源,河流输入的沉积物粒度变粗,输沙量增加,这一新的物质来源是造成Z07钻孔磁性参数发生显著变化的主因.

关键词：黄河三角洲磁性地层学环境磁学沉积环境演化

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