The Mg/Ca proxy for temperature: A Uvigerina core-top study in the Southwest Pacific
The Mg/Ca proxy for temperature: A Uvigerina core-top study in the Southwest Pacific
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温度的镁/钙代理：西南太平洋的 Uvigerina 核心顶部研究
DOI：
10.1016/j.gca.2021.06.015
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发表时间：
2021
影响因子：
5
通讯作者：
Cassandre R. Stirpe, Katherine A.
中科院分区：
文献类型：
--
作者：
Cassandre R. Stirpe, Katherine A.
底栖有孔虫Uvigerina peregrinais的Mg/Ca比值是重建底层水古温度的常用代用指标，因为它被假设为对底层水碳酸盐化学的变化不敏感。这项研究提出了核心topU。peregrinasamples从西南太平洋0.6至4.4公里水深，对应的水温为1-9 °C。将来自新西兰丰盛湾和查塔姆隆起的样品与以前的校准进行比较，以评估Mg/Ca温度敏感性。发表的堆芯顶部温度敏感性可以解释U。在我们的大多数研究站点，除了在中间深度约2.4-3.3 km的站点外，其中Mg/Ca比大大高于这些校准的预期，可能反映了成岩或非热效应。稳定同位素测量（δ 18 O和δ 13 C）、激光消融分析和扫描电子显微镜成像补充微量元素测量，以评估可能影响U的变量。peregrinaMg/Ca在这些网站。形态变异性，污染，溶解和重结晶都未能提供令人满意的解释异常高镁/钙的观察。我们推断，一个非温度控制，可能与碳酸盐化学，可能会影响镁掺入一些U。目前还不清楚影响这些位点的因素是随着时间的推移而恒定还是可以变化。出于这个原因，我们建议，镁/钙最近的标本在每个核心网站应检查建立校准曲线之前，追求下芯古温度重建usingU。佩雷格里娜在可能的情况下，古温度估计还应使用其他独立的代理验证。现有的核心顶部校准有效地预测U。peregrinaMg/Ca在我们的大多数研究地点，但我们的研究结果强调，需要更彻底的了解非温度因素，可以影响镁/钙inU。佩雷格里娜
The Mg/Ca ratio of the infaunal benthic foraminiferUvigerina peregrinais a commonly used proxy for reconstructing bottom water paleotemperatures because it is hypothesized to be insensitive to changes in bottom water carbonate chemistry. This study presents core-topU. peregrinasamples from the southwest Pacific from 0.6 to 4.4 km water depth, corresponding to water temperatures of 1–9 °C. Samples from New Zealand’s Bay of Plenty and Chatham Rise were compared to previous calibrations to assess Mg/Ca temperature sensitivity. Published core-top temperature sensitivies can explainU. peregrinaMg/Ca at a majority of our study sites, with the exception of sites at intermediate depths of ~2.4–3.3 km, where the Mg/Ca ratios are substantially higher than expected from these calibrations, possibly reflecting diagenetic or non-thermal effects. Stable isotope measurements (δ18O and δ13C), laser ablation analyses, and scanning electron microscope imagery complement trace element measurements to assess variables potentially affectingU. peregrinaMg/Ca at these sites. Morphotype variability, contamination, dissolution, and recrystallization all failed to provide satisfactory explanations for anomalously high Mg/Ca observations. We infer that a non-temperature control, perhaps related to carbonate chemistry, may be affecting the Mg incorporation in someU. peregrinaspecimens, though no factor has yet been clearly identified.It is unclear whether the factor affecting these sites is constant through time or could vary. For this reason, we recommend that Mg/Ca of recent specimens at each core site should be checked against established calibration curves prior to pursuing down-core paleotemperature reconstructions usingU. peregrina. Where possible, paleotemperature estimates should also be validated using other independent proxies. Existing core-top calibrations effectively predictU. peregrinaMg/Ca at the majority of our study sites, but our findings underscore the need for a more thorough understanding of non-temperature factors that can influence Mg/Ca inU. peregrina.
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