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Carbonate preservation in marine sediments: Mid to higher latitude quantitative proxies

机译:海洋沉积物中的碳酸盐保存:中高纬度定量代理

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摘要

Observations of carbonate preservation in marine sediments have long been used to infer changes in ocean circulation or biogenic production. When combined with measures of organic carbon rain and calcite accumulation rates, quantitative estimates of changes in preservation can reveal variation in biogenic fluxes, the org. C to calcite flux ratio and saturation state of bottom waters. Here we develop quantitative dissolution proxies for mid to higher latitudes based on foraminiferal test fragmentation. Examining surface sediments, we find that fragmentation in G. bulloides and G. truncatulinoides is linear with increasing seabed dissolution rate and can be used to quantify changes in carbonate preservation. G. truncatulinoides shows a constant relationship of fragmentation to dissolution. However, we observe that, although linear to dissolution rate, the fragmentation in G. bulloides depends on which morphotype is present. Other species, such as G. inflata, have complex responses to increasing dissolution and are less direct preservation indicators.
机译:长期以来,海洋沉积物中碳酸盐保存的观察一直被用来推断海洋循环或生物生产的变化。当结合有机碳雨和方解石积累速率的测量结果时,对保存变化的定量估计可以揭示生物通量的变化。 C与方解石的通量比和底部水的饱和状态。在这里,我们基于有孔虫测试碎片,为中高纬度地区开发了定量溶出代理。检查表面沉积物后,我们发现大疱G.buloides和G.truncatulinoides中的碎片与海床溶解速率的增加呈线性关系,可用于量化碳酸盐保存的变化。 G. truncatulinoides显示片段化与溶解的恒定关系。但是,我们观察到,尽管G.buloides中的溶解速率与溶出速率呈线性关系,但取决于存在的形态类型。其他物种,例如G. inflata,对溶解度的增加具有复杂的响应,并且不是直接的保存指标。

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