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Carbonic metamorphism, granulites and crustal growthStabilization of early crust against melting by high radioactivity and against resorption into the mantle by fast convective overturn requires that water and heat producers were flushed upwards within 50 Myr of accretion. Creation of a refractory base of granulite by metamorphism associated with CO2 vapour explains CO2-rich fluid inclusions in ancient high-grade rocks, minor-element depletions and local phenomena of arrested development of charnockite in Precambrian terrains. The hot-spot and plate-tectonic models of Precambrian crustal evolution lead to different schemes for CO2 delivery to continental roots. New tectonic concepts may be needed to explain carbonic metamorphism and other features of early crustal evolution.
Document ID
19810028497
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Newton, R. C.
(Chicago Univ. Chicago, IL, United States)
Smith, J. V.
(Chicago, University Chicago, Ill., United States)
Windley, B. F.
(Leicester, University Leicester, United Kingdom)
Date Acquired
August 11, 2013
Publication Date
November 6, 1980
Publication Information
Publication: Nature
Volume: 288
Subject Category
Geophysics
Accession Number
81A12901
Funding Number(s)
CONTRACT_GRANT: NGL-14-001-171
CONTRACT_GRANT: NSF EAR-79-05723
CONTRACT_GRANT: NSF EAR-78-15939
CONTRACT_GRANT: NSF EAR-77-21700
CONTRACT_GRANT: NERC-GR/3/3198
Distribution Limits
Public
Copyright
Other

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