Brown, 2007 revision condiciones de metamorfismo en la corteza

Brown, 2007 revision condiciones de metamorfismo en la corteza

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PLEASE SCROLL DOWN FOR ARTICLE This article was downloaded by: [Ctro Geosciencias Biblioteca] On: 17 December 2010 Access details: Access Details: [subscription number 918398399] Publisher Taylor & Francis Informa Ltd Registered in England and Wales Registered Number: 1072954 Registered office: Mortimer House, 37- 41 Mortimer Street, London W1T 3JH, UK International Geology Review Publication details, including instructions for authors and subscription information: http://www.informaworld.com/smpp/title~content=t902953900 Metamorphic Conditions in Orogenic Belts: A Record of Secular Change M. Brown a a University of Maryland, College Park, Online publication date: 06 August 2010 To cite this Article Brown, M.(2007) 'Metamorphic Conditions in Orogenic Belts: A Record of Secular Change', International Geology Review, 49: 3, 193 — 234 To link to this Article: DOI: 10.2747/0020-6814.49.3.193 URL: http://dx.doi.org/10.2747/0020-6814.49.3.193 Full terms and conditions of use: http://www.informaworld.com/terms-and-conditions-of-access.pdf This article may be used for research, teaching and private study purposes. Any substantial or systematic reproduction, re-distribution, re-selling, loan or sub-licensing, systematic supply or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material.
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193 International Geology Review , Vol. 49, 2007, p. 193–234. Copyright © 2007 by V. H. Winston & Son, Inc. All rights reserved. 0020-6814/07/920/193-42 $25.00 Metamorphic Conditions in Orogenic Belts: A Record of Secular Change M. B ROWN 1 Laboratory for Crustal Petrology, Department of Geology, University of Maryland, College Park, Maryland 20742 Abstract In general, Archean rocks exhibit rather ordinary moderate-P–high-T facies series metamor- phism; neither blueschists nor any record of deep continental subduction and return are docu- mented. However, the abundance and scale of ultrahigh-temperature (UHT) metamorphic belts from the Neoarchean to the Cambrian imply a significant change in geodynamics during the Neoarchean Era, after which transient sites of high heat flow were available at intervals throughout this period of Earth evolution. Many Neoproterozoic–Cambrian UHT metamorphic belts appear to have developed in settings analogous to modern backarcs that were closed and inverted during crustal aggregation and formation of the Gondwana supercontinent. If backarcs were the general setting for UHT meta- morphism, then on a hotter Earth the cyclic formation of supercratons (in the Neoarchean Era) and supercontinents (in the Proterozoic Eon) required the destruction of oceans floored by thinner litho-
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