Carte Des Gites Mineraux Du Quebec Dpv 809 Region De Laurentie Saguenay

Author : A. Kröner
Publisher : Springer
ISBN 13 : 9783642700026
Total Pages : 286 pages
Book Rating : 4.7/5 ( download)

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Download or read book Archaean Geochemistry written by A. Kröner and published by Springer. This book was released on 2011-12-06 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Archaean Geochemistry 1972 - 1984 The realisation that the continental crust contains well-preserved relics which date as far back as 4/5 of the Earth's age has given a great impetus to the study of early Precambrian terrains. As late as the mid-sixties the Archaean still constituted the 'terra-in cognita' of earth science. High metamorphic grades, poor out crop, and not least a widely assumed obliteration of early crustal records by convective recycling and thermal reworking had com bined to discourage research in this field. Many excellent local studies existed, notably around gold mining centres, but remained unrelated to a broader regional and theoretical understanding. This situation has changed as the consequence of two inter-related factors: (1) advances in isotopic methods and their application to Precambrian rocks, and (2) the recognition that some of the oldest terrains have retained a wealth of primary igneous and sedi mentary textures and even geochemical characteristics.