Precise measurement of low (<100 ppm) chlorine concentrations in submarine basaltic glass by electron microprobe

van der Zwan, Froukje M., Fietzke, Jan and Devey, Colin W. (2012) Precise measurement of low (<100 ppm) chlorine concentrations in submarine basaltic glass by electron microprobe Journal of Analytical Atomic Spectrometry, 27 (11). pp. 1966-1974. DOI 10.1039/C2JA30173C.

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Abstract

There is a 2–3 order of magnitude difference between the chlorine concentrations of seawater and the magmas making up the oceanic crust. For this reason, chlorine is a key element for tracing present and past water–rock interactions. In order to trace processes such as assimilation of hydrothermally altered
oceanic crust by mid-ocean ridge magmas, a high precision method with low detection limits is
required, since conventional methods are not able to reveal variations in the intrinsically low chlorine content of these basalts. We present a new method to measure chlorine in basaltic glass by electron microprobe, using a combination of mapping and standard-sample bracketing techniques. Due to the high environmental background of chlorine, special emphasis is put on the influence of different
preparation and cleaning procedures, as well as other possible effects on the measurements (e.g. sample size). Calibration of the method is performed by informational values of international standards and by minerals with a fixed chlorine content. Finally, new information on chlorine concentration values for
commonly used standard reference materials (SRM) is provided. With this new method chlorine can be measured at very low detection limits (10’s of ppm’s) with a precision of 1–2 ppm standard deviation for low chlorine concentrations.

Document Type: Article
Additional Information: WOS:000310479900018
Keywords: chlorine, electron microprobe, MORB, new analytical technique, high precision; HOSTED MELT INCLUSIONS; MID-ATLANTIC RIDGE; EAST PACIFIC RISE; ICP-MS; ASSIMILATION; MAGMA; OLIVINE; VOLCANO; INDONESIA; BEHAVIOR
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
DOI etc.: 10.1039/C2JA30173C
ISSN: 0267-9477
Projects: Jeddah Transect
Date Deposited: 17 Oct 2012 09:44
Last Modified: 09 Jun 2017 12:10
URI: http://eprints.uni-kiel.de/id/eprint/16469

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