X-Ray fluorescence (XRF) of discrete samples from IODP Hole 389-M0097C@en

Results of X-Ray fluorescence (XRF) on discrete samples from the above given hole of International Ocean Discovery Program (IODP) Expedition 389 (Hawaiian Drowned Reefs). The offshore phase of this expedition took place between 2023-08-31 and 2023-10-31 onboard multipurpose vessel MMA Valour sailing from and to Barbers Point Harbor, Hawai'i, USA, followed by the onshore phase from 2025-02-06 to 2025-02-26 at the Bremen Core Repository (BCR) hosted at MARUM – Center for Marine Environmental Sciences, University of Bremen. During the onshore phase a set of solid-phase samples were taken from the work halves of core sections, with a volume of approx. 10 cubic centimeters each, were taken with the purpose to be later on split into aliquots for the following three analyses: X-ray diffraction, carbon and X-ray fluorescence. Bulk samples were subsequently freeze-dried, ground and homogenized to a fine powder (<20 µm particle size) by ECORD Science Operator staff using a pestle and an agate mortar or a ball mill. For elemental composition analyses an aliquot of approx. 4 g (±0.2 g) powdered and homogenized sample was weight into a plastic cuvette consisting of a Mylar foil bottom covered with polypropylene film ad compacted twice with a force of approx. 25 kg/cm3 on a plastic piston to obtain a smooth surface. Elemental concentrations were then determined by ED-XRF spectroscopy utilizing a PANalytical Epsilon 3-XLE benchtop ED-XRF spectrometer operated in the MARUM sediment geochemistry laboratory. Quality flag \"#0\" indicates the measurements' result was below detection limit. […]本数据集为国际大洋发现计划（International Ocean Discovery Program, IODP）389次航次（夏威夷淹没礁科考）指定钻孔离散样品的X射线荧光（X-ray fluorescence, XRF）测试结果。该航次海上作业阶段于2023年8月31日至2023年10月31日开展，搭载多用途船舶“MMA Valour”号往返于美国夏威夷巴伯斯角港；后续陆上作业阶段于2025年2月6日至2025年2月26日在不来梅大学MARUM海洋环境科学中心下属的不来梅岩芯库（Bremen Core Repository, BCR）进行。陆上作业阶段，科研人员从岩芯切片的工作半面取样，每份样品体积约10立方厘米，取样目的为将样品拆分为子样，以开展三项分析：X射线衍射、碳元素分析及X射线荧光测试。块状样品经冷冻干燥、研磨均质至粒径小于20微米的细粉，该前处理流程由ECORD科学运维团队使用研杵与玛瑙研钵或球磨机完成。为开展元素组成分析，称取约4g（±0.2g）均质粉末样品至塑料比色皿中，该比色皿底部覆有迈拉膜（Mylar foil）并以聚丙烯薄膜封装，随后在塑料活塞上以约25kg/cm³的压力两次压实以获得平整表面。元素浓度通过能量色散X射线荧光（Energy Dispersive X-ray Fluorescence, ED-XRF）光谱法测定，测试设备为PANalytical Epsilon 3-XLE台式ED-XRF光谱仪，测试地点为MARUM沉积物地球化学实验室。质量标记“#0”表示测量结果低于检测限。[…]