In situ Magnesium/Calcium (Mg/Ca) and oxygen isotope (d18O) measurements in Neogloboquadrina pachyderma shells collected in 2006 and 2007 in sediment traps moored in the Irminger Sea

This dataset includes chemical and isotopic measurements on shells of the planktic foraminifera Neogloboquadrina pachyderma sinistral collected in April 2006 and April 2007 from two sediment traps moored in the Irminger Sea (IRM-3, 59°14.86’North (N), 39°39.47’West (W) and IRM-4, 59°14.85’N, 39°39.47’W). Individual shells were analyzed in situ for their magnesium/calcium (Mg/Ca) ratios by Laser Ablation Inductively Coupled Mass Spectrometry (LA-ICP-MS), and for their stable oxygen isotope composition (d18O) by secondary ion mass spectrometry (SIMS). Hydrographic measurements reveal that the water column at sample location is isothermal and isohaline during the month prior to collection. The purpose of this project was to determine potential differences in the Mg/Ca or d18O composition of the lamellar calcite, formed and the upper water column, and the crust calcite, precipitated in deeper waters but at the same temperature and salinity than the lamellar calcite. Corresponding publication: Livsey, C.M., Kozdon, R., Bauch, D., Brummer, G.-J.A., Jonkers, L., Orland, I., Hill, T.M., Spero, H.J., 2020. High-resolution Mg/Ca and d18O patterns in modern Neogloboquadrina pachyderma from the Fram Strait and Irminger Sea. Paleoceanography and Paleoclimatology, 35(9): e2020PA003969.doi:10.18739/A2319S316.

本数据集包含2006年4月与2007年4月，采集自伊尔明格海（Irminger Sea）两处锚定沉积物捕获器的浮游有孔虫（planktic foraminifera）左旋新拟抱球虫（Neogloboquadrina pachyderma sinistral）壳体的化学与同位素测试数据。两处采样位点分别为IRM-3（北纬59°14.86’，西经39°39.47’）与IRM-4（北纬59°14.85’，西经39°39.47’）。

研究人员采用激光剥蚀电感耦合等离子体质谱法（Laser Ablation Inductively Coupled Mass Spectrometry, LA-ICP-MS）对单个壳体的镁钙比（Mg/Ca）进行原位分析，并通过二次离子质谱（Secondary Ion Mass Spectrometry, SIMS）测定其稳定氧同位素组成（δ¹⁸O）。

水文测量结果显示，采样位点所在水柱在采样前一个月处于等温等盐状态。本项目旨在明确两种成因方解石的Mg/Ca与δ¹⁸O组成差异：一类为形成于上层水体的层状方解石（lamellar calcite），另一类为在更深水域沉淀、但温度与盐度与层状方解石一致的壳层方解石（crust calcite）。

相关已发表论文：Livsey, C.M., Kozdon, R., Bauch, D., Brummer, G.-J.A., Jonkers, L., Orland, I., Hill, T.M., Spero, H.J., 2020. 《来自弗拉姆海峡与伊尔明格海的现代左旋新拟抱球虫高分辨率Mg/Ca与δ¹⁸O特征》。《古海洋学与古气候学》（Paleoceanography and Paleoclimatology），35(9): e2020PA003969.doi:10.18739/A2319S316。