Formation of Wollastonite by Chemically Reactive Fluid Flow During Contact Metamorphism, Mt. Morrison Pendant, Sierra Nevada, California, USA

Quartz-calcite sandstones experienced the reaction calcite + quartz = wollastonite + CO2 during prograde contact metamorphism at P = 1500 bars and T = 560[degrees]C. Rocks were in equilibrium during reaction with a CO2-H2O fluid with XCO2 = 0[middot]14. The transition from calcite-bearing, wollaston...

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Bibliographic Details
Published in:Journal of petrology 2001-09, Vol.42 (9), p.1705-1728
Main Authors: FERRY, JOHN M., WING, BOSWELL A., RUMBLE, DOUGLAS
Format: Article
Language:English
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Summary:Quartz-calcite sandstones experienced the reaction calcite + quartz = wollastonite + CO2 during prograde contact metamorphism at P = 1500 bars and T = 560[degrees]C. Rocks were in equilibrium during reaction with a CO2-H2O fluid with XCO2 = 0[middot]14. The transition from calcite-bearing, wollastonite-free to wollastonite-bearing, calcite-free rocks across the wollastonite isograd is only several millimeters wide. The wollastonite-forming reaction was driven by infiltration of quartz-calcite sandstone by chemically reactive H2O-rich fluids, and the distribution of wollastonite directly images the flow paths of reactive fluids during metamorphism. The mapped distribution of wollastonite and modeling of an O-isotope profile across a lithologic contact indicate that the principal direction of flow was layer-parallel, directed upward, with any cross-layer component of flow
ISSN:0022-3530
1460-2415
DOI:10.1093/petrology/42.9.1705