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Sulphur isotope variations in diagenetic pyrite from core plug to sub-millimetre scales

¹ Isotope Geosciences Unit, Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow G75 0QF, and ² Department of Geology & Geophysics, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, and ³ Department of Statistics, University of Glasgow, Glasgow G12 8QQ, UK

^* E-mail: t.fallick{at}surrc.ac.uk

(Received 22 June 1998; revised 15 March 1999)

Sulphur isotope ratio measurements (³⁴S) of diagenetic pyrite are commonly used to identify S sources and mechanisms of sulphide formation in basinal sediments. This study reports such data for a diagenetic pyrite nodule from the Brent Group sandstones of the northern North Sea at three sampling scales: 50 cm (core subsample), 500 µm (laser microprobe) and 50 µm (ion microprobe). Similar ³⁴S variations are found by the laser and ion microprobe techniques. There is a very wide range in ³⁴S (<–10 to >+50) within the nodule and isotopically heavy S (³⁴S >+20) is common at all scales. The nodule ³⁴S distribution does not fit a Rayleigh fractionation pattern. The laser microprobe sampling at 100–500 µm scales seems to be adequate to characterize S isotope variations in this material.

KEYWORDS: S isotope ratios, pyrite, basinal sediments, ion microprobe, laser probe

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