A Dataset of the Mid-Brunhes Period at Site MD05-2925, Solomon Sea: Surface-Subsurface Planktonic Foraminifera Stable Oxygen Isotope and Mg/Ca Ratios

Here we present derived thermal-hydrological variations data during the Marine Isotope Stages (MISs) 10-12 using surface and subsurface dwelling planktonic foraminiferal geochemical proxies of a sedimentary core of MD05-2925 (9.3oS, 151.5oE, water depth 1661 m, core depth 1842-2430 cm), Solomon Sea. Globigerinoides ruber (s.s., white, 250-300 μm) and Pulleniatina obliquiloculata (355-425 μm) tests were hand-picked and cleaned for stable carbon and oxygen isotopes and Mg/Ca analyses. Composite benthic foraminifera tests (>250 μm, Uvigerina spp., and Bulimina spp.) are also hand-picked and cleaned for stable oxygen isotope stratigraphy. In total, 235 and 148 measurements for C-O stable isotopes and Mg/Ca ratios for planktonic foraminifera in 2-5 cm resolution for the period from 352.1 to 462.3 ka are presented in this data report, respectively. Age model is established by tuning composite benthic foraminiferal oxygen isotope to global composite benthic foraminifera oxygen isotope stack LR04. Surface and subsurface temperatures and seawater oxygen isotopes (δ18Ow , without ice volume correction) were calculated.本研究基于所罗门海MD05-2925沉积岩芯（9.3°S，151.5°E，水深1661 m，岩芯段深度1842~2430 cm）的表层与次表层浮游有孔虫（planktonic foraminifera）地球化学代用指标（geochemical proxies），构建了海洋同位素阶段（Marine Isotope Stages, MISs）10~12期间的衍生热-水文变化数据集。研究选取该岩芯中的两类浮游有孔虫壳体：栖息于表层的Globigerinoides ruber（严格型，白色，粒径250~300 μm）与次表层的Pulleniatina obliquiloculata（粒径355~425 μm），经人工挑选与清洗前处理后，用于开展稳定碳、氧同位素（stable carbon and oxygen isotopes）与Mg/Ca比值分析。此外，研究还人工挑选并清洗了粒径>250 μm的复合底栖有孔虫（benthic foraminifera）壳体（涵盖Uvigerina属与Bulimina属），用于构建稳定氧同位素地层序列。本数据报告共提供了352.1~462.3 ka时段内、分辨率为2~5 cm的浮游有孔虫碳-氧稳定同位素测试数据235组，以及Mg/Ca比值测试数据148组。年代框架通过将本岩芯的复合底栖有孔虫氧同位素序列与全球复合底栖有孔虫氧同位素堆栈LR04进行调谐建立。研究同时计算得到了表层与次表层海水温度，以及海水氧同位素值（δ¹⁸O_w，未进行冰体积校正）。