The effect of thermal history on the development of mineral assemblages during infiltration-driven contact metamorphism |
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| Authors: | G M Dipple John M Ferry |
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| Institution: | (1) Department of Earth and Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4, Canada, CA;(2) Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD 21218, USA, TP |
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| Abstract: | A one-dimensional model for coupled heat flow, fluid flow, and mineral reaction predicts the identity and spatial and temporal
distributions of mineral assemblages produced during contact metamorphism of siliceous dolomite. Results are compared to mineral
distributions predicted by transport models for fluid flow along steady-state temperature profiles and to mineral distributions
observed in contact aureoles to assess whether a detailed analysis of heat flow is required to extract meaningful information
of fluid flow history from field data. Results identify several mineral assemblages whose interpretation in terms of fluid
flow is dependent on an understanding of their thermal history. Certain key mineral assemblages, however, are sensitive records
of the geometry and amount of fluid flow but are insensitive to thermal history. The presence or absence of these mineral
assemblages constrains the history of fluid flow during contact metamorphism of siliceous dolomite regardless of the details
of heat flow. Occurrences of the key assemblages record both magmatic fluid flow in the direction of decreasing temperature
(Alta, Elkhorn aureoles) and metamorphic fluid flow in the direction of increasing temperature (Beinn an Dubhaich, Kasuga-mura
aureoles) during contact metamorphism. Time-integrated input fluid flux averages on the order of 100 mol/cm2 with a range of ±1 order of magnitude.
Received: 13 October 1995 / Accepted: 20 March 1996 |
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