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首页> 外文期刊>Journal of Asian earth sciences >Formation of greigite (Fe_3S_4) in the sediments of saline lake Lop Nur, northwest China, and its implications for paleo-environmental change during the last 8400 years
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Formation of greigite (Fe_3S_4) in the sediments of saline lake Lop Nur, northwest China, and its implications for paleo-environmental change during the last 8400 years

机译：西北罗布泊盐湖沉积物中的钙铁矿（Fe_3S_4）的形成及其对近8400年古环境变化的影响

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摘要

We present the results of rock magnetic and SEM/EDX analyses of the sediments of Lop Nur, a former saline lake in the Tarim Basin, China. The aim of the study was to assess the impacts of authigenic iron sulfide minerals (e.g., greigite) on the sedimentary magnetic properties and their possible relationship with environmental and climate change. Five layers with relatively high values of chi, chi(ARM), SIRM, S-ratio, chi(ARM)/chi and SIRM/chi are identified within organic-rich sediments; the five layers are dated to ca. 8150-7000, 5300-4900, 3600-3100, 2750-2550 and 1820-1680 cal. yr BP. Authigenic greigite is the dominant magnetic mineral within the five layers and it is present in the stable single domain state. The magnetic properties of the intervening layers are dominated by detrital multidomain magnetite. Combined with results of a previous study, we infer that the greigite-bearing sediments were deposited during cold and wet periods which were probably related to the North Atlantic cold events during the past 8400 yr. During these periods, greigite formation was likely driven by an enhanced organic matter supply, but pyritization was constrained by the decreased sulfate content and high sedimentation rate. The greigite and its diagnostic magnetic parameters (e.g., SIRM/chi) can be regarded as an indicator of the hydrological and climatic evolution of the Tarim Basin.
机译：我们介绍了中国塔里木盆地前盐湖罗布泊的沉积物的岩石磁学和SEM / EDX分析结果。该研究的目的是评估自生硫化铁矿物（例如，钙铁矿）对沉积磁性的影响及其与环境和气候变化的可能关系。在富含有机物的沉积物中发现了五层，具有较高的chi，chi（ARM），SIRM，S比率，chi（ARM）/ chi和SIRM / chi值。这五个图层的日期大约为8150-7000、5300-4900、3600-3100、2750-2550和1820-1680卡路里年BP。自生灰铁矿是五层内的主要磁性矿物，它以稳定的单畴态存在。中间层的磁性由碎屑多畴磁铁矿决定。结合以前的研究结果，我们推断在高温和湿润时期沉积了含钙铁矿的沉积物，这可能与过去8400年中的北大西洋寒冷事件有关。在这些时期，钙铁矿的形成可能是由有机物供应的增加驱动的，但是黄铁矿的形成受到硫酸盐含量降低和高沉积速率的限制。钙铁矿及其诊断磁参数（例如SIRM / chi）可被视为塔里木盆地水文和气候演变的指标。

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  • 来源
    《Journal of Asian earth sciences》 |2019年第1期|99-108|共10页
  • 作者

    Li Wen; Mu Guijin; Zhang Weiguo; Lin Yongchong; Zhang Dongliang; Song Haoze;

  • 作者单位

    Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Peoples R China|Cele Natl Stn Observat & Res Desert Grassland Eco, Cele 848300, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Peoples R China|Cele Natl Stn Observat & Res Desert Grassland Eco, Cele 848300, Peoples R China;

    East China Normal Univ, State Key Lab Estuarine & Coastal Reach, Shanghai 200062, Peoples R China;

    Minnan Normal Univ, Sch Hist & Geog, Zhangzhou 363000, Fujian, Peoples R China;

    Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Peoples R China;

    Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Peoples R China|Cele Natl Stn Observat & Res Desert Grassland Eco, Cele 848300, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Greigite; Magnetic properties; Early diagenesis; Lop Nur; North Atlantic cold events;

    机译：钙铁矿;磁性;早期成岩;罗布泊;北大西洋寒冷事件;

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