Proxies for paleo-oxygenation: A downcore comparison between benthic foraminiferal surface porosity and I/Ca

Proxies for paleo-oxygenation: A downcore comparison between benthic foraminiferal surface porosity and I/Ca
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古氧化作用的代表:底栖有孔虫表面孔隙度和 I/Ca 之间的岩心比较

DOI:
10.1016/j.palaeo.2021.110588
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发表时间:
2021
期刊:
Palaeoecology
影响因子:
--
通讯作者:
Lu, Zunli
Lu, Zunli
中科院分区:
--
文献类型:
--
作者:
Lu, Wanyi;Barbosa, Catia F.;Rathburn, Anthony E.;da Matta Xavier, Priscila;Cruz, Anna P.S.;Thomas, Ellen;Rickaby, Rosalind E.M.;Zhang, Yi Ge;Lu, Zunli

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底栖有孔虫表面孔隙度(孔隙覆盖的表面积的平均百分比;较高的孔隙度:较低的氧合)和碘钙比(I/Ca,较高的I/Ca:较高的氧合)都是很有前途的古海洋学指标,将通过在地下岩心研究中进行测试而取得进展。在这里,我们报告了巴西南部边缘(26°40.22′ S,46°26.46′ W,475 m水深)的这些替代物的第一次地下岩心比较(约45 kyr)。这两个指标对低O2浓度(<50 μmol/kg)最敏感,而在高O2浓度下不受很好的限制。整个岩心的孔隙度值一般较低(<15%),I/Ca值在~4和~ 6 μmol/mol之间。这两个代用指标总体上是一致的,表明在过去的45 kyr期间,该地点的底层水氧浓度保持在50 μmol/kg以上。一些非O2因素(例如,碘酸盐还原率、水团混合、温度、有孔虫壳的坚固性)可能影响代用指标,需要进一步调查。
Benthic foraminiferal surface porosity (the mean percentage of surface area covered by pores; higher porosity: lower oxygenation) and iodine to calcium ratio (I/Ca, higher I/Ca: higher oxygenation) are both promising paleoceanographic proxies that will advance through testing in down-core studies. Here we report the first down-core comparison (~45 kyr) of these proxies for a core from the southern Brazilian margin (26°40.22′ S, 46°26.46′ W, 475 m water depth). Both proxies are most sensitive to low-O2conditions (<50 μmol/kg), and not well-constrained at higher O2concentrations. Porosity values are generally low (<15%) and I/Ca ranges between ~4 and ~ 6 μmol/mol throughout the core. The two proxies are overall consistent, suggesting that bottom-water oxygen concentrations at the site remained above 50 μmol/kg during the last 45 kyr. Several non-O2factors (e.g., iodate reduction rates, water mass mixing, temperature, foraminiferal shell robustness) could influence the proxies and require further investigation.
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