Data report: bulk rock compositions of samples from the IODP Expedition 309/312 sample pool, ODP Hole 1256D 1
Data report: bulk rock compositions of samples from the IODP Expedition 309/312 sample pool, ODP Hole 1256D 1
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DOI：
10.2204/iodp.proc.309312.204.2009
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
N. Neo;S. Yamazaki;S. Miyashita
中科院分区：
文献类型：
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作者：
N. Neo;S. Yamazaki;S. Miyashita
在本数据报告中，我们提出了在综合大洋钻探计划考察309/312期间从1256 D孔回收的159个样品的主要和微量元素丰度，通过X射线荧光和电感耦合等离子体质谱法（ICP-MS）测定。这些样品代表了从远征309/312样品池中采集的大部分岩石，这是一项合作努力，旨在对来自1256 D孔的代表性样品进行全面的地球化学分析。分析的样品分布于席状岩流和块状岩流（海底以下~750米[mbsf]），穿过席状岩墙复合体（1060.9-1406.6 mbsf），并到达位于两个辉长岩侵入体下方的孔底的晚期横切岩墙（~1500 mbsf）。分析方法和分析的准确性进行了描述，并与船载分析远征309和312。船载分析与本研究的某些元素存在明显的成分差异。在远征312期间收集的一些样品没有被常规的酸消化完全溶解，最可能的原因是锆石的存在，导致锆石中的元素浓度较低，包括Zr，Hf，Th和U。这些样品在碱熔融后通过ICP-MS进一步分析。在309/312远征期间采集的大多数岩石显示出正常的洋中脊玄武岩（N-MORB）特征。三个样品的微量元素模式均为轻稀土元素富集模式。从1256 D孔目前的底部发现的晚期岩脉具有高度演化的N-MORB化学性质。
In this data report we present major and trace element abundances for 159 samples recovered from Hole 1256D during Integrated Ocean Drilling Program Expedition 309/312, determined by X-ray fluorescence and inductively coupled plasma–mass spectrometry (ICP-MS). These samples represent a large proportion of rocks taken from the Expedition 309/312 sample pool, a collaborative effort to provide comprehensive geochemical analyses of a representative suite of samples from Hole 1256D. The samples analyzed are distributed from the sheet and massive flows (~750 meters below seafloor [mbsf]), through the sheeted dike complex (1060.9–1406.6 mbsf), and to the late-stage crosscutting dike (~1500 mbsf) at the present bottom of hole underlying the two gabbro intrusions. Analytical procedures and accuracy of analysis are described and compared with shipboard analyses from Expeditions 309 and 312. There are clear compositional differences for some elements between the shipboard analyses and this study. Some of the samples collected during Expedition 312 were not completely dissolved by routine acid digestion, most probably because of the presence of zircon, resulting in low concentrations of elements hosted by zircon including Zr, Hf, Th, and U. These samples were further analyzed by ICP-MS following alkali fusion. Most rocks sampled during Expedition 309/312 display normal mid-ocean-ridge basalt (N-MORB) signatures. However, three samples yield trace element patterns with light rare earth element enrichment patterns. The late dike recovered from the present bottom of Hole 1256D has a highly evolved N-MORB chemistry.