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Title: Metamorphic fluid flow - a question of scale, crustal depth and bulk rock composition

Abstract

Recent studies have indicated that certain metamorphic rocks interacted with significant volumes of aqueous fluid during their time-integrated mineral reaction history. Rather than demonstrating that pervasive fluid flow is general in metamorphic rocks, these documented cases instead suggest the likelihood of pronounced to extreme channelization of through-going in fluids in deep-seated metamorphic terranes (P>3 kbar). In rocks more shallowly buried, and therefore under low lithostatic stress, pervasive flow along grain boundaries and open microfractures probably occurred, as at Skye and the Skaergaard Complex. In higher pressure metamorphic environments, documented cases of high fluid/rock ratio make a strong case for flow channelized in veins or in impure marble aquifers where pore space and permeability were created by decarbonation reactions driven by infiltration of aqueous fluid. The source of this fluid may commonly be traced to a nearby wet granitic intrusion or quartz vein. As long as the pressurized source of aqueous fluid continued, outward flow was possible as fluid held open the intergranular pore space which was created only at the infiltration/reaction front where a reduction in solid volume accompanied reaction. Cessation or interruption of fluid flow would allow the pore space to close due to porous-rock strength being exceeded bymore » lithostatic stress. Pervasive flow or aqueous fluid in deepseated metamorphic terranes is therefore probably limited to carbonate-bearing lithologies adjacent to sources of major volumes of fluid; otherwise, fluid flow is likely to be localized in fractures or veins.« less

Authors:
;
Publication Date:
Research Org.:
Yale Univ., New Haven, CT (USA)
OSTI Identifier:
6170064
Report Number(s):
CONF-8510489-
Journal ID: CODEN: GAAPB
Resource Type:
Conference
Journal Name:
Geol. Soc. Am., Abstr. Programs; (United States)
Additional Journal Information:
Journal Volume: 17; Conference: 98. annual meeting of the Geological Society of America, Orlando, FL, USA, 28 Oct 1985
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 54 ENVIRONMENTAL SCIENCES; FLUID FLOW; FLOW MODELS; GROUND WATER; ROCK-FLUID INTERACTIONS; METAMORPHIC ROCKS; AQUIFERS; CHEMICAL REACTIONS; GEOLOGIC FRACTURES; GEOLOGIC HISTORY; GEOTHERMAL FLUIDS; HYDROLOGY; LITHOLOGY; METAMORPHISM; PRESSURE EFFECTS; FLUIDS; GEOLOGIC STRUCTURES; HYDROGEN COMPOUNDS; MATHEMATICAL MODELS; OXYGEN COMPOUNDS; ROCKS; WATER; 580100* - Geology & Hydrology- (-1989); 520200 - Environment, Aquatic- Chemicals Monitoring & Transport- (-1989); 580400 - Geochemistry- (-1989)

Citation Formats

Tracy, R J, and Rye, D M. Metamorphic fluid flow - a question of scale, crustal depth and bulk rock composition. United States: N. p., 1985. Web.
Tracy, R J, & Rye, D M. Metamorphic fluid flow - a question of scale, crustal depth and bulk rock composition. United States.
Tracy, R J, and Rye, D M. Tue . "Metamorphic fluid flow - a question of scale, crustal depth and bulk rock composition". United States.
@article{osti_6170064,
title = {Metamorphic fluid flow - a question of scale, crustal depth and bulk rock composition},
author = {Tracy, R J and Rye, D M},
abstractNote = {Recent studies have indicated that certain metamorphic rocks interacted with significant volumes of aqueous fluid during their time-integrated mineral reaction history. Rather than demonstrating that pervasive fluid flow is general in metamorphic rocks, these documented cases instead suggest the likelihood of pronounced to extreme channelization of through-going in fluids in deep-seated metamorphic terranes (P>3 kbar). In rocks more shallowly buried, and therefore under low lithostatic stress, pervasive flow along grain boundaries and open microfractures probably occurred, as at Skye and the Skaergaard Complex. In higher pressure metamorphic environments, documented cases of high fluid/rock ratio make a strong case for flow channelized in veins or in impure marble aquifers where pore space and permeability were created by decarbonation reactions driven by infiltration of aqueous fluid. The source of this fluid may commonly be traced to a nearby wet granitic intrusion or quartz vein. As long as the pressurized source of aqueous fluid continued, outward flow was possible as fluid held open the intergranular pore space which was created only at the infiltration/reaction front where a reduction in solid volume accompanied reaction. Cessation or interruption of fluid flow would allow the pore space to close due to porous-rock strength being exceeded by lithostatic stress. Pervasive flow or aqueous fluid in deepseated metamorphic terranes is therefore probably limited to carbonate-bearing lithologies adjacent to sources of major volumes of fluid; otherwise, fluid flow is likely to be localized in fractures or veins.},
doi = {},
journal = {Geol. Soc. Am., Abstr. Programs; (United States)},
number = ,
volume = 17,
place = {United States},
year = {1985},
month = {1}
}

Conference:
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