Trace elements concentrations measured in bulk sediment samples collected during the IN2017-V01 voyage of the RV Investigator

Sediment cores were collected from the East Antarctic margin, aboard the Australian Marine National Facility R/V Investigator from January 14th to March 5th 2017 (IN2017_V01; Armand et al., 2018). This marine geoscience expedition, named the “Sabrina Sea Floor Survey”, focused notably on studying the interactions of the Totten Glacier with the Southern Ocean through multiple glacial cycles. The cores were collected using a multi-corer (MC) and a Kasten corer (KC). The MC were sliced every centimetre, wrapped up in plastic bags, and stored in the fridge. The KC was sub-sampled using an u-channel; and sliced every centimetre once back the home laboratory (IMAS, UTAS, Hobart, Australia).This dataset presents concentrations of major and trace elements measured in bulk multi-cores sediment samples collected during the IN2017_V01 voyage. The data include the sampling date (day/month/year), the latitude and longitude (in decimal degrees), the seafloor depth (in meter), the sediment core ID, the sediment depth (in cm), and the concentrations (in ppm or μg/g) of a suite of elements. This dataset presents concentrations of major and trace elements measured in bulk sediment samples collected during the IN2017_V01 voyage. The data include the sampling date (day/month/year), the latitude and longitude (in decimal degrees), the seafloor depth (in meter), the sediment core ID (KC14), the sediment depth (in cm), and the concentrations (in ppm or μg/g) of a suite of elements.About 200 mg of dried and ground sediment were weighed into a clean Teflon vial and oxidized with a mixture of concentrated HNO3 and 30% H2O2 (1:1). Samples were then digested in open vials using an acid mixture comprising 10 mL HNO3, 4 mL HCl, and 2 mL HF, at 180°C until close to dryness. Digested residues were converted to nitric form before being oxidised with a mixture of 1 mL HNO3 and 1 mL HClO4 at 220°C until fully desiccated. Samples were finally re-dissolved in 4 mL 7.5 M HNO3.A 400 μL aliquot was removed from the 4 mL digest solution and diluted ~2500 times in 2% HNO3 for trace metals analysis by Sector Field Inductively Coupled Mass Spectrometry (SF-ICP-MS, Thermo Fisher Scientific, Bremen, Germany) at the Central Science Laboratory (UTAS, Hobart, Australia). Indium was added as internal standard (In, 100 ppb). 88Sr, 89Y, 95Mo, 107Ag, 109Ag, 111Cd, 133Cs, 137Ba, 146Nd, 169Tm, 171Yb, 185Re, 187Re, 205Tl, 208Pb, 232Th, 238U, 23Na, 24Mg, 27Al, 31P, 32S, 42Ca, 47Ti, 51V, 52Cr, 55Mn, 56Fe, 59Co, 60Ni, 63Cu and 66Zn were analysed using multiple spectral resolutions. Element quantification was performed via external calibration using multi-element calibration solutions (MISA suite, QCD Analysts, Spring Lake, NJ, USA). Raw intensities were blank and dilution corrected. ReferencesL.K. Armand, P.E. O’Brien and On-board Scientific Party. 2018. Interactions of the Totten Glacier with the Southern Ocean through multiple glacial cycles (IN2017-V01): Post-survey report, Research School of Earth Sciences, Australian National University: Canberra.

2017年1月14日至3月5日，研究团队依托澳大利亚海洋国家设施的“调查者号”（R/V Investigator）科考船，在南极东缘海域采集沉积物岩芯（航次编号：IN2017_V01；Armand等，2018）。
本次海洋地球科学考察命名为“‘萨布丽娜海底调查’（Sabrina Sea Floor Survey）”，核心研究目标为解析托滕冰川（Totten Glacier）与南大洋在多个冰期旋回中的相互作用。

本次岩芯采集采用多管采样器（multi-corer, MC）与卡斯坦采芯器（Kasten corer, KC）完成。其中，多管采样器获取的岩芯每1厘米进行一次切片，封装于塑料袋后冷藏保存；卡斯坦采芯器获取的岩芯则先通过U型槽进行分样，返回位于澳大利亚霍巴特的塔斯马尼亚大学海洋与南极研究所（IMAS, UTAS）实验室后，再以每1厘米为间隔进行切片。

本数据集包含IN2017_V01航次采集的块状多管沉积物样品中的常量元素与微量元素浓度数据，所记录的参数包括采样日期（日/月/年）、经纬度（十进制度格式）、海底水深（米）、沉积物岩芯编号、沉积物深度（厘米）以及一系列元素的浓度（单位：ppm或μg/g）。本数据集同时包含IN2017_V01航次采集的块状沉积物样品中的常量元素与微量元素浓度数据，所记录的参数包括采样日期（日/月/年）、经纬度（十进制度格式）、海底水深（米）、沉积物岩芯编号（KC14）、沉积物深度（厘米）以及一系列元素的浓度（单位：ppm或μg/g）。

样品前处理流程如下：称取约200 mg干燥研磨后的沉积物样品至洁净的特氟龙（Teflon）消解瓶中，先用体积比1:1的浓硝酸（HNO3）与30%过氧化氢（H2O2）混合液进行氧化预处理。随后将样品置于敞口消解瓶中，采用10 mL浓硝酸（HNO3）、4 mL盐酸（HCl）与2 mL氢氟酸（HF）组成的混合酸体系，在180℃下加热至近干。消解残渣经转化为硝酸态后，再以1 mL浓硝酸（HNO3）与1 mL高氯酸（HClO4）混合液在220℃下加热至完全蒸干。最后将样品用4 mL 7.5 mol/L硝酸（HNO3）重新溶解。

从4 mL消解液中移取400 μL等分试样，用2%硝酸溶液稀释约2500倍，随后于澳大利亚塔斯马尼亚大学霍巴特校区中央科学实验室，采用扇形场电感耦合等离子体质谱仪（Sector Field Inductively Coupled Mass Spectrometry, SF-ICP-MS，赛默飞世尔科技（Thermo Fisher Scientific），德国不来梅）进行痕量金属元素分析。实验中加入铟（In，100 ppb）作为内标物质。

本次分析采用多种光谱分辨率模式，对88Sr、89Y、95Mo、107Ag、109Ag、111Cd、133Cs、137Ba、146Nd、169Tm、171Yb、185Re、187Re、205Tl、208Pb、232Th、238U、23Na、24Mg、27Al、31P、32S、42Ca、47Ti、51V、52Cr、55Mn、56Fe、59Co、60Ni、63Cu及66Zn进行定量检测。元素定量分析采用外标校准法，使用多元素校准溶液（MISA套装，QCD Analysts公司，美国新泽西州斯普林湖）进行校准。原始信号强度经空白校正与稀释倍数校正后用于后续计算。

参考文献：
L.K. Armand、P.E. O’Brien及船上科考团队，2018年。《托滕冰川与南大洋在多个冰期旋回中的相互作用（IN2017-V01）》航次后报告，澳大利亚国立大学地球科学研究学院：堪培拉。