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

J.G Ryan; J.W Shervais; Y Li; M.K Reagan; H Y Li; D Heaton; M Godard; M Kirchenbaur; S.A Whattam; J.A Pearce; T Chapman; W Nelson; J Prytulak; K Shimizu; K Petronotis

doi:10.1016/j.chemgeo.2017.01.007

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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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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

J.G Ryan, J.W Shervais, Y Li, M.K Reagan, H Y Li, D Heaton, M Godard, M Kirchenbaur, S.A Whattam, J.A Pearce, …

Chemical Geology, Vol.451, pp.55-66

02/20/2017

DOI: 10.1016/j.chemgeo.2017.01.007

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Abstract

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 1200m 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. •A pXRF was used to quantitatively analyze recovered cores on IODP Exp. 352.•Elements between Z=19 and Z=40 showed linear standard correlations with near-zero intercepts.•pXRF performance was similar on powders and rock surfaces, and was highly reproducible over time.•Comparisons of pXRF with ICP-OES and wavelength dispersive XRF show systematic correlations.•The pXRF permitted chemostratigraphic analysis of Exp. 352 core materials in real time on the ship.

Portable XRF

Boninite

Chemostratigraphy

Rock surface analysis

Basalt

Core analysis

IODP Expedition 352

ICP-OES

Details

Title: Subtitle: 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
Creators: J.G Ryan - School of Geosciences, University of South Florida, Tampa, FL, USA
J.W Shervais - Geology, Utah State University, USA
Y Li - Institute of Geology, Chinese Academy of Geological Sciences, Beijing, China
M.K Reagan - Dept. Earth and Environmental Sciences, University of Iowa, Iowa City, USA
H Y Li - Guangzhou Institute of Geochemistry
D Heaton - College of Earth, Ocean and Atmospheric Sciences, Oregon State Univ., Corvallis, OR, USA
M Godard - Geosciences, Universite Montpellier II, Montpellier, France
M Kirchenbaur - Geologische Inst., Universitat Koln, Koln, Germany
S.A Whattam - Dept. Earth and Environmental Sciences, Korea University, Republic of Korea
J.A Pearce - Earth and Ocean Sciences, Cardiff University, UK
T Chapman - School of Geosciences, University of Sydney, Australia
W Nelson - Physics, Astronomy, Geosciences, Towson University, MD, USA
J Prytulak - Earth Sciences and Engineering, Imperial College, UK
K Shimizu - International Ocean Discovery Program, College Station, TX, USA
K Petronotis - Kochi Core Center, Kochi University, Japan
Contributors: IODP Expedition 352 (Institution)
Resource Type: Journal article
Publication Details: Chemical Geology, Vol.451, pp.55-66
DOI: 10.1016/j.chemgeo.2017.01.007
ISSN: 0009-2541
eISSN: 1872-6836
Publisher: Elsevier B.V
Grant note: name: International Ocean Discovery Program; name: NSF, award: OCE1558855, OCE1558689, OCE1558647; name: Chinese Science Foundation, award: GASI-GEOGE-02
Language: English
Date published: 02/20/2017
Academic Unit: Earth and Environmental Sciences
Record Identifier: 9983983644302771

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