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:
影响因子:
--
通讯作者:
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
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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影响因子:
3.7
作者:
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通讯作者:
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影响因子:
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5.8
作者:
Lu, Zunli;Jenkyns, Hugh C.;Rickaby, Rosalind E. M.
通讯作者:
Rickaby, Rosalind E. M.