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Tephrochronological constraints on the timing and nature of sea-level change prior to and during glacial termination V

机译：在冰川终止前和冰川终止前和冰川终止期间的时序和性质的Tephorchronologication

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Glacial-interglacial variations in ice volume and sea level are essential components of the Pleistocene global climate evolution. Deciphering the timing of change of these key climate parameters with respect to the insolation forcing is central to understanding the processes controlling glacial terminations. Here we exploit the sensitivity of the Paleo Tiber River (central Italy) to sea-level forced changes in the base level and the frequent occurrence of datable tephra layers in its sedimentary successions to reconstruct the timing of the relative sea-level (RSL) change between 450 and 403 ka, i.e., across the glacial termination (T-V) that marks the transition between Marine Isotope Stage (MIS) 12 and MIS 11. The analysis hinges on new stratigraphic data, tephra geochemical fingerprinting, and ~(40)Ar/~(39)Ar dating from a fluvial section that represents the inland counterpart of the near mouth, coastal aggradational successions of the San Paolo Formation (SPF). Tephra correlation indicates that the morpho-stratigraphic record of the inland section is as sensitive to the sea-level change as its coastal counterparts, which makes it ideal to complement previous RSL reconstructions from the Tiber River catchment basin, thereby providing a more detailed picture of the sea-level history across T-V. Combined sedimentological and morphological proxies of the composed inland-coastal SPF record document the occurrence of two phases of relatively rapid sea-level rise, here interpreted as meltwater pulse (MWP) events. The earlier MWP occurred between ～450 and ～445 ka and matches a relatively minor episode of the sea-level rise documented in an existing RSL record, while the younger MWP at ～430 ka corresponds to the high amplitude sea-level rise that marks T-V. We find that both MWPs coincide with episodes of ice-rafted debris deposition in the North Atlantic (Heinrich-like events) and with attendant Southern Hemisphere warming, plausibly associated with the bipolar seesaw.
机译：冰量和海平面的冰川 - 中间夹型变化是全球气候进化的基本组成部分。解密这些关键气候参数的变化的时间相对于缺位强迫是理解控制冰川终端的过程的核心。在这里，我们利用了古代伯河（意大利）对基本级别的海平面强制变化的敏感性，并且在其沉积演替中频繁发生了可长期的Tephra层，以重建相对海平面（RSL）变化的时间在450到403 ka之间，即横跨冰川终端（电视），标志着海洋同位素阶段（MIS）12和MIS 11之间的过渡。分析铰链在新的地层数据，Tephra地球化学指纹识别和〜（40）AR / 〜（39）AR从河流部分约会，代表了近嘴的内陆对应，SAN Paolo形成的沿海汇编演替（SPF）。 Tephra相关表明，内陆部分的Morpho-stratibraphaphic记录与海平面变化一样敏感，作为其沿海同行，这使得从台倾泻流域盆地补充以前的RSL重建，从而提供更详细的图片电视上的海平历史。组合的内陆海岸SPF记录组合的沉积和形态学代理凭证的发生率相对较快的海平面上升两相，这里被解释为熔水脉冲（MWP）事件。早期的MWP发生在〜450和〜445 k之间，并匹配在现有的RSL记录中记录的海平面上升的相对较小的插曲，而〜430 kA的较年轻的MWP对应于标记电视的高幅度海平面上升。我们发现，MWPS都与北大西洋（海上宗教事件）的冰圆形碎片沉积和服务员南半球变暖，与双极跷跷板相关联。

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  • 来源
    《Oceanographic Literature Review》 |2021年第7期|1496-1496|共1页
  • 作者

    B. Giaccio; G. Marino; F. Marra;

  • 作者单位

    Istituto Nazionale di Geofisica e Vulcanologia Rome Italy;

    Istituto Nazionale di Geofisica e Vulcanologia Rome Italy;

    Istituto Nazionale di Geofisica e Vulcanologia Rome Italy;

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