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首页> 外文期刊>Quaternary International >Uncovering a landscape buried by the super-eruption of Toba, 74,000 years ago: A multi-proxy environmental reconstruction of landscape heterogeneity in the Jurreru Valley, south India
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Uncovering a landscape buried by the super-eruption of Toba, 74,000 years ago: A multi-proxy environmental reconstruction of landscape heterogeneity in the Jurreru Valley, south India

机译：发现74,000年前多巴喷发所掩埋的景观：印度南部Jurreru谷地景观异质性的多代理环境重建

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摘要

The Youngest Toba Tuff (YTT) eruption ～ 74 ka is the largest volcanic event to occur during the last two million years. This paper presents a high resolution landscape reconstruction for the Jurreru Valley, south India, immediately prior to this eruption. Primary ash fall deposits have sealed the pre-Toba surface of the Jurreru Valley, and subsequent deposition of remobilised ash has helped preserve this horizon. These primary YTT deposits provide an isochron that allows for the study of palaeoenvironmental conditions across a 25,000 m~2 area in the Jurreru Valley, permitting the reconstruction of the pre-Toba landscape. Sixty sites with exposed primary ash deposits have been recorded as part of a Total Station survey, twelve of which have been subject to detailed stratigraphical study. This has enabled a reconstruction of the topography of the buried surface in the Jurreru Valley. Stable isotope and phytolith analyses are used to explore diversity across this buried landscape, indicating that the ratio of C_3 to C_4 plants varies with regard to changes in topographic height in the landscape of up to ～5 m. High levels of spatial heterogeneity within these proxy data are indicated by this study, highlighting the risks of extrapolating regional palaeoenvironmental sequences from vertically sampled sedimentary sections, which may well reflect highly localised influences of topography and geomorphology.
机译：约74 ka的最年轻的鸟羽凝灰岩（YTT）喷发是最近两百万年来发生的最大的火山事件。本文提出了喷发前印度南部Jurreru山谷的高分辨率景观重建。灰烬的初生沉淀物已经封堵了Jurreru谷的Tooba前地表，随后沉积的灰分沉积有助于保持这一前景。这些主要的YTT沉积提供了等时线，可以研究Jurreru山谷25,000 m〜2区域中的古环境条件，从而可以重建Toba之前的景观。作为全站仪调查的一部分，已记录了60处暴露有原始灰分沉积物的地点，其中12处已经进行了详细的地层研究。这使得能够重建Jurreru谷中埋藏地表的地形。稳定的同位素和植物岩体分析被用于探索该埋藏地貌的多样性，表明C_3与C_4植物的比例随地形高度的变化而变化，最高可达〜5 m。这些研究表明这些代用数据中存在高度的空间异质性，突出了从垂直采样的沉积剖面中推断区域古环境序列的风险，这很可能反映了地形和地貌的高度局限性影响。

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  • 来源
    《Quaternary International》 |2012年第1期|p.135-147|共13页
  • 作者

    J. Blinkhorn; A.G. Parker; P. Ditchfield; M. Haslam; M. Petraglia;

  • 作者单位

    Research Laboratory for Archaeology and the History of Art, School of Archaeology, University of Oxford, Oxford, UK;

    Deparrment of Anthropology and Geography, Oxford Brookes University, UK;

    Research Laboratory for Archaeology and the History of Art, School of Archaeology, University of Oxford, Oxford, UK;

    Research Laboratory for Archaeology and the History of Art, School of Archaeology, University of Oxford, Oxford, UK;

    Research Laboratory for Archaeology and the History of Art, School of Archaeology, University of Oxford, Oxford, UK;

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