Application of a handheld X-ray fluorescence spectrometer for real-time, high-density quantitative analysis of drilled igneous rocks and sediments during IODP Expedition 352
Application of a handheld X-ray fluorescence spectrometer for real-time, high-density quantitative analysis of drilled igneous rocks and sediments during IODP Expedition 352
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DOI：
10.1016/j.chemgeo.2017.01.007
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发表时间：
2017-02
期刊：
影响因子：
3.9
通讯作者：
J. Ryan;J. Shervais;Yibing Li;M. Reagan;Hongyang Li;D. Heaton;M. Godard;M. Kirchenbaur;S. Whattam;J. Pearce;T. Chapman;W. Nelson;J. Prytulak;K. Shimizu;K. Petronotis
中科院分区：
文献类型：
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作者：
J. Ryan;J. Shervais;Yibing Li;M. Reagan;Hongyang Li;D. Heaton;M. Godard;M. Kirchenbaur;S. Whattam;J. Pearce;T. Chapman;W. Nelson;J. Prytulak;K. Shimizu;K. Petronotis
手持式能量色散便携式X射线光谱仪（pXRF）通常设计用于定性测量应用。我们开发了pXRF的船载定量分析协议，并采用该仪器进行了超过2000个单独的丰度测量的主要和微量元素的选择超过1200米的回收核心在八个星期的国际海洋发现计划（IODP）远征352伊豆小笠原弧。pXRF的分析性能、准确度和精密度在粉末岩石样品和新切割的岩石表面上是相同的，样品结果在误差范围内与通过船上ICP-OES分析进行的测量相似，除了少数元素的丰度水平较低。仪器性能是最佳的Z = 19和Z = 40之间的元素，和系统产生的K，Ca，Ti，V，Cr，Mn，Fe，Cu，Zn，Rb，Sr和Zr的粉末样品和岩石表面上的可重复数据。通过pXRF测量一套地质标准参考材料和特征良好的熔岩开发的工作曲线允许对样品粉末和岩石表面上的许多受检元素进行准确的定量测量。虽然pXRF在以前的巡航中偶尔使用，但远征352是第一次使用pXRF测量岩心表面收集回收岩心样品的详细，高密度化学地层学。这些高分辨率的数据可以近实时地识别化学性质不同的喷发单位。地球化学趋势的快速识别大大改善了我们对船上和岸基分析样品的选择，允许对我们的考察结果进行更全面的解释，并为钻井作业提供关键决策信息。
Handheld energy dispersive portable X-ray spectrometers (pXRF) are generally designed and used for qualitative survey applications. We developed shipboard quantitative analysis protocols for pXRF and employed the instrument to make over 2000 individual abundance measurements for a selection of major and trace elements on over 1200 m of recovered core during the eight weeks of the International Ocean Discovery Program (IODP) Expedition 352 to the Izu-Bonin forearc. pXRF analytical performance, accuracy and precision were found to be the same on powdered rock samples and on freshly cut rock surfaces, and sample results were similar within error to measurements made via shipboard ICP-OES analysis save at low abundance levels for a few elements. Instrument performance was optimal for elements between Z = 19 and Z = 40, and the system yielded reproducible data for K, Ca, Ti, V, Cr, Mn, Fe, Cu, Zn, Rb, Sr, and Zr on both powdered samples and rock surfaces. Working curves developed via pXRF measurement of a suite of geologic standard reference materials and well-characterized lavas permitted accurate quantitative measurements for many of the examined elements on both sample powders and rock surfaces. Although pXRF has been sporadically employed on previous cruises, Expedition 352 is the first time a detailed, high-density chemostratigraphy of recovered core samples was collected using pXRF measurements of rock core surfaces. These high-resolution data allowed the recognition of chemically distinct eruptive units in near real-time. The rapid identification of geochemical trends vastly improved our selection of samples for shipboard and shore-based analysis, permitted a more comprehensive interpretation of our Expedition results, and provided key decision-making information for drilling operations.