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首页> 外文期刊>Journal of Asian earth sciences >The oldest (Early Ediacaran) Sr isotope record of mid-ocean surface seawater: Chemostratigraphic correlation of a paleo-atoll limestone in southern Siberia
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The oldest (Early Ediacaran) Sr isotope record of mid-ocean surface seawater: Chemostratigraphic correlation of a paleo-atoll limestone in southern Siberia

机译：大洋中部表层海水最古老的（早期Ediacaran）Sr同位素记录：西伯利亚南部古钟形石灰岩的化学地层学相关性

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摘要

By examining Sr isotope stratigraphy of the Ediacaran paleo-atoll limestone in southern Siberia, we first demonstrated the surface seawater information from the lost Ediacaran (late Neoproterozoic) oceans. The Ediacaran Baratal limestone in the Corny Altai Mountain in Siberia is a remnant of a mid-oceanic paleo-atoll complex developed on a paleo-seamount. Sr isotope ratios (~(87)Sr/~(86)Sr) from the basal 20 m-thick interval of the Baratal limestone vary mostly by 0.7069-0.7079, and these show a generally increasing trend upsection. The relatively low Sr ratios indicate that mid-oceanic seawater, i.e. global seawater, was more influenced by hydrothermal activities along mid-oceanic ridges rather than continental erosion during the Ediacaran. A chemostratigraphical correlation with the hitherto known secular change in Sr isotope suggests that the basal Baratal limestone was deposited particularly in the Early Ediacaran. This timing corresponds to the immediate aftermath of the Neoproterozoic (Marinoan) snowball Earth event. The relatively low Sr isotope ratios and the increasing trend upsection are concordant with the onset of continental erosion during the deglaciation during the Early Ediacaran.
机译：通过检查西伯利亚南部埃迪亚卡拉古锥岩石灰岩的Sr同位素地层，我们首先证明了丢失的埃迪亚卡拉（新元古代晚期）海洋的表层海水信息。西伯利亚康尼阿尔泰山（Corny Altai Mountain）的埃迪卡拉安巴拉特（Ediacaran）巴拉特石灰岩是古海山上发育的中海古太平洋环礁群的残余物。来自Baratal石灰岩底部20 m厚层段的Sr同位素比（〜（87）Sr /〜（86）Sr）主要变化0.7069-0.7079，这些都表明上升趋势总体上是增加的。相对较低的Sr比率表明，洋中海海水，即全球海水，受洋中海脊热液活动的影响更大，而不是Ediacaran时期的大陆侵蚀。与迄今已知的Sr同位素的长期变化的化学地层学相关性表明，基底的巴拉特石灰岩沉积于特别的Ediacaran早期。此时间对应于新元古代（Marinoan）雪球地球事件的直接后果。相对较低的Sr同位素比和上升趋势的上升与Ediacaran早期冰消期间大陆侵蚀的发生是一致的。

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  • 来源
    《Journal of Asian earth sciences》 |2013年第15期|66-76|共11页
  • 作者

    Susumu Nohda; Bo-Shian Wang; Chen-Feng You; Yukio Isozaki; Yuko Uchio; Michael M. Buslov; Shigenori Maruyama;

  • 作者单位

    Earth Dynamic System Research Center, National Cheng Kung University, University Rd #1, Tainan 701, Taiwan;

    Earth Dynamic System Research Center, National Cheng Kung University, University Rd #1, Tainan 701, Taiwan;

    Earth Dynamic System Research Center, National Cheng Kung University, University Rd #1, Tainan 701, Taiwan;

    Department of Earth Science and Astronomy, The University of Tokyo, Komaba, Meguro, Tokyo 153-8902, Japan;

    Earth-Life Science Institute, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152-8551, Japan;

    Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Science, Novosibirsk 6300900, Russia;

    Earth-Life Science Institute, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152-8551, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Ediacaran; ~(87)Sr/~(86)Sr ratio; Paleo-atoll; Mid-oceanic; Corny Altai Mtn.; Snowball Earth;

    机译：Ediacaran;〜（87）Sr /〜（86）Sr比;古环礁;中洋Corny Altai山;雪球地球;

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