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~(230)Th normalization: An essential tool for interpreting sedimentary fluxes during the late Quaternary

机译：〜（230）Th归一化：解释第四纪晚期沉积通量的基本工具

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There is increasing evidence indicating that syndepositional redistribution of sediment on the seafloor by bottom currents is common and can significantly affect sediment mass accumulation rates. Notwithstanding its common incidence, this process (generally referred to as sediment focusing) is often difficult to recognize. If redistribution is near synchronous to deposition, the stratigraphy of the sediment is not disturbed and sediment focusing can easily be overlooked. Ignoring it, however, can lead to serious misinterpretations of sedimentary fluxes, particularly when past changes in export flux from the overlying water are inferred. In many instances, this problem can be resolved, at least for sediments deposited during the late Quaternary, by normalizing to the flux of 230Th scavenged from seawater, which is nearly constant and equivalent to the known rate of production of 230Th from the decay of dissolved 234U. We review the principle, advantages and limitations of this method. Notwithstanding its limitations, it is clear that 230Th normalization does provide a means of achieving more accurate interpretations of sedimentary fluxes and eliminates the risk of serious misinterpretations of sediment mass accumulation rates.
机译：越来越多的证据表明，底流在海底沉积物的同沉积再分布很普遍，并且会显着影响沉积物的质量积累速率。尽管其发生率很高，但通常难以识别该过程（通常称为沉积物聚焦）。如果重新分配几乎与沉积同步，则沉积物的地层不会受到干扰，沉积物的聚集很容易被忽略。但是，忽略它会导致对沉积通量的严重误解，尤其是在推断出上层水过去的出口通量变化时。在许多情况下，至少对于第四纪后期沉积的沉积物，可以通过对从海水中清除的230Th通量进行归一化处理来解决，该通量几乎恒定，并且等于溶解物的衰变已知的230Th产生速率234U。我们回顾了这种方法的原理，优点和局限性。尽管有其局限性，很明显230Th归一化确实提供了一种实现对沉积通量的更准确解释的方法，并且消除了严重误解沉积物质量积累速率的风险。

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