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.

本数据集为经CTG标记（CTG-labelled）的星状非抱球虫（Nonionella stella）三个最新形成的壳室（编号n、n-1、n-2）的锰钙比（Mn/Ca）、镁钙比（Mg/Ca）及锶钙比（Sr/Ca）数据，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。该物种标本采自美国加利福尼亚南部外圣巴巴拉盆地三个沿水深梯度布设站位的底质表层样品。本数据集属于一项探索有孔虫Mn/Ca比值对底层水氧化条件变化及孔隙水锰地球化学响应的研究内容。

该数据集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). 有孔虫Mn/Ca比值作为底层水缺氧替代指标：美国圣巴巴拉盆地星状非抱球虫的评估. 《古海洋学与古气候学》(Paleoceanography and Paleoclimatology), 36, e2020PA004167. https://doi.org/10.1029/2020PA004167.
如需进一步详情，请联系通讯作者：[e-mail]。

2018年5月，科考船“罗伯特·戈登·斯普鲁尔号”（R/V Robert Gordon Sproul）执行SP1811航次，对圣巴巴拉盆地北部进行了采样，布设的三个站位分别为：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）。沉积物岩心采用Ocean Instruments MC800型多管取样器获取。岩心被切割为0.5 cm厚的分层样品，包括“0–0.5 cm”“0.5–1.0 cm”“1.0–1.5 cm”“1.5–2.0 cm”（站位1另设“浮泥层”），并经CTG标记以识别活体有孔虫。选取星状非抱球虫标本，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采用CAMECA ims1280型离子探针（瑞典自然历史博物馆Nordsim实验室）分析，以OKA方解石晶体作为参考物质。