Trace-elemental data (Mn/Ca, Mg/Ca, Sr/Ca) of the benthic foraminifer Nonionella stella from core-top sediments of the Santa Barbara Basin, USA

Dataset of Mn/Ca, Mg/Ca and Sr/Ca of the three most-recently formed chambers (n, n-1 and n-2) of Nonionella stella (CTG-labelled) acquired by Secondary Ion Mass Spectrometry (SIMS; Nordsim, Stockholm, Sweden). Nonionella stella specimens were collected from core-top samples of three sites over a depth-gradient in the Santa Barbara Basin, off Southern California, USA. The data set is part of a study exploring the response of foraminiferal Mn/Ca to changing bottom-water oxygenation and pore-water Mn geochemistry. The data is discussed in: Brinkmann, I., Ni, S., Schweizer, M., Oldham, V. E., Quintana Krupinski, N. B., Medjoubi, K., et al. (2021). Foraminiferal Mn/Ca as bottom-water hypoxia proxy: An assessment of Nonionella stella in the Santa Barbara Basin, USA. Paleoceanography and Paleoclimatology, 36, e2020PA004167. https://doi.org/10.1029/2020PA004167. Please contact the main author for further details ([e-mail]). The northern SBB was sampled in May 2018 (cruise SP1811, R/V Robert Gordon Sproul) at site 1 (430 m; 34º 18.6’N, 119º 54.0’W), site 2 (505 m; 34º 20.8’N, 119º 59.0’W) and site 3 (567 m; 34º 19.2’N, 120º 03.4’W). Sediment cores were recovered with a Ocean Instruments MC800 multicorer. The cores were sliced into 0.5 cm sections (‘0–0.5 cm’, ‘0.5–1.0 cm’, ‘1.0–1.5 cm’ and ‘1.5–2.0 cm’; site 1 also 'fluff') and CTG-labelled to identify living foraminifera. Nonionella stella specimens were selected and bleached (NaOCl 5%) prior to epoxy-embedding. Trace element concentrations of test walls were analysed using a CAMECA ims1280 ion microprobe (Nordsim Laboratory, Swedish Museum of Natural History, Stockholm, Sweden); an OKA calcite crystal served as reference material.本数据集针对采自美国加利福尼亚州南部近海圣巴巴拉盆地（Santa Barbara Basin）三个深度梯度站位岩芯顶部样品中的星状非球房虫（Nonionella stella）个体，采用二次离子质谱（Secondary Ion Mass Spectrometry, SIMS；瑞典斯德哥尔摩Nordsim实验室）测定了其最新形成的3个壳体腔室（编号n、n-1、n-2）的Mn/Ca、Mg/Ca及Sr/Ca比值。星状非球房虫标本经CTG标记以区分活体有孔虫（foraminifera）。本数据集属于一项探索有孔虫Mn/Ca比值对底层水氧化还原条件变化及孔隙水锰地球化学的响应，以其作为替代指标的研究内容。 相关研究成果发表于：Brinkmann, I.、Ni, S.、Schweizer, M.、Oldham, V. E.、Quintana Krupinski, N. B.、Medjoubi, K.等（2021）的《有孔虫Mn/Ca作为底层水缺氧替代指标：美国圣巴巴拉盆地星状非球房虫的评估》，刊载于《古海洋学与古气候学》（Paleoceanography and Paleoclimatology）第36卷，文章编号e2020PA004167，DOI: 10.1029/2020PA004167。如需获取更多细节，请联系通讯作者：[e-mail]。 2018年5月，科考船“罗伯特·戈登·斯普罗尔号”（R/V Robert Gordon Sproul）执行SP1811航次，对圣巴巴拉盆地北部的3个站位开展采样：站位1（水深430 m，34°18.6′N，119°54.0′W）、站位2（水深505 m，34°20.8′N，119°59.0′W）及站位3（水深567 m，34°19.2′N，120°03.4′W）。沉积物岩芯通过Ocean Instruments MC800型多管取样器获取，岩芯被切割为0.5 cm间隔的层段："0–0.5 cm"、"0.5–1.0 cm"、"1.0–1.5 cm"及"1.5–2.0 cm"（站位1额外包含浮泥层（fluff）），并经CTG标记以识别活体有孔虫。 研究人员挑选星状非球房虫个体，经5%次氯酸钠（NaOCl）漂白后进行环氧树脂包埋。壳体壁的微量元素浓度通过CAMECA ims1280型离子探针（瑞典自然历史博物馆Nordsim实验室，斯德哥尔摩）分析，以OKA方解石晶体作为参考物质。