Sulfur isotopic disequilibrium and fluid-rock interaction during metamorphism of sulfidic black shales from the Waterville-Augusta area, Maine, USA

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doi: 10.1016/0016-7037(92)90266-L
Authors:Oliver, Nicholas H.; Hoering, Thomas C.; Johnson, Timothy W.; Rumble, Douglas, III; Shanks, Wayne C., III
Author Affiliations:Primary:
Monash University, Department of Earth Sciences, Clayton, Australia
Carnegie Institution of Washington, United States
U. S. Geological Survey, United States
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 56(12), p.4257-4265. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:1992
Note:In English. 24 refs.; illus. incl. 2 tables, sketch map
Summary:S isotopic analyses are presented of graphitic sulphidic phyllites, schists and other lithologies and veins from the graphitic sulphide schist unit in the Sangerville formation. The results indicate that the rocks have not been significantly disturbed isotopically by regional metamorphism from inferred organic-rich sedimentary origins. Sulphides, from chlorite- to sillimanite-grades, from veins and blebs in the schists show disequilibrium fractionations. Matrix pyrite-pyrrhotite pairs from rocks above 500 degrees C-grade metamorphism approach isotopic equilibrium attributed to recrystallization during metamorphism and deformation. The S isotopic results reflect the initial sedimentary isotopic variations, especially for pyrite. The preservation of a wide range of S isotopic compositions in rocks metamorphosed to highT is not evidence of 'fluid absent' conditions or internal buffering of fluid composition. [R.K.H.]
Subjects:Black shale; Clastic rocks; Equilibrium; Isotope ratios; Isotopes; Metamorphism; Outcrops; Paleozoic; Polymetamorphism; Regional metamorphism; S-34/S-32; Sangerville Formation; Sedimentary rocks; Silurian; Stable isotopes; Sulfur; Waterville Formation; Augusta Maine; Kennebec County Maine; Maine; United States; Waterville Maine
Abstract Numbers:93M/3161
Record ID:1993002097
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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