Infiltration of aqueous fluid and high fluid-rock ratios during greenschist facies metamorphism; a reply

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Authors:Ferry, J. M.
Author Affiliations:Primary:
Johns Hopkins Univ., Dep. Earth and Planet. Sci., Baltimore, MD, United States
Volume Title:Journal of Petrology
Source:Journal of Petrology, 27(3), p.695-714. Publisher: Clarendon Press, Oxford, United Kingdom. ISSN: 0022-3530
Publication Date:1986
Note:In English. For discussion by Wood, B. J. and Graham, C. M., see J. Petrol., Vol. 27, Part 3, p. 751-761, 1986; for original paper by Ferry, J. M., see J. Petrol., Vol. 25, p. 871-893, 1984. 78 refs.; illus. incl. 3 tables, geol. sketch map, sketch map
Summary:Wood & Graham suggest that the fluid/rock ratios of Ferry were over-estimated because the T of the biotite isograd, inferred from biotite-garnet and calcite-dolomite geothermometry was under-estimated by approx 40°C. New data, however, which take account of the effects of both FeCO3 and MnCO3 substitutions in calcite, suggest that published calcite-dolomite temperatures need no significant correction. The preferred T for the biotite isograd remains approx 400°C. Various geological, petrological and isotopic data support the suggestion of fluid/rock ratios >1 during low-grade metamorphism, both in south-central Maine and worldwide; this should encourage serious consideration of a multi-pass model for metamorphic fluid flow. [R.A.H.]
Subjects:Facies; Garnet group; Geologic thermometry; Greenschist facies; Isograds; Low-grade metamorphism; Metamorphic rocks; Metamorphism; Mineral assemblages; Nesosilicates; Orthosilicates; P-T conditions; Paleozoic; Petrology; Regional metamorphism; Silicates; Silurian; Temperature; Thermodynamic properties; Waterville Formation; Maine; United States; Evolution; South-central Maine
Abstract Numbers:87M/0639
Record ID:1988000328
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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