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The Precambrian metamorphic rocks of Ceylon: A critique of a radical interpretation

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Zusammenfassung

Die neue Hypothese von M. B.Katz (1971), da\ die Vijaya-Gneise und -Migmatite das ursprüngliche Grundgebirge unter den metamorphen Sedimenten der Highland-Serie sind, hÄlt einer kritischen Prüfung nicht stand. Die Ältere Auffassung, die Vijaya-Gesteine seien durch retrograd-metamorphe Amphibolit-Fazies-überprÄgung aus der vorher in Granulit-Fazies entwickelten Highland-Serie hervorgegangen, ist aufrechtzuerhalten und kann durch neue Explorationskartierung und strukturelle und isotopische Analysen wesentlich gestützt werden.

Abstract

A critical review leads to the rejection of the recent hypothesis of M. B.Katz (1971) according to which the Vijayan gneisses and migmatites formed an original basement to the Highland Series metasediments. An earlier synthesis which interpreted the Vijayan rocks as the result of a retrograde amphibolite facies metamorphism superimposed upon pre-existing granulite facies Highland Series is upheld and is strongly supported by new reconnaissance mapping and structural and isotopic analyses.

Résumé

Un examen critique montre qu'il faut rejeter la nouvelle hypothèse de M. B.Katz (1971) selon laquelle les gneiss et migmatites du Vijáya constituent le socle original sous les sédiments métamorphisés de la série du Highland. De nouveaux levés de reconnaissance et des analyses structurelles et isotopiques soutiennent au contraire la vue antérieure selon laquelle les roches vijayiennes seraient issues de roches de la série du Highland antérieurement à faciès granulitique, et ce, à la suite d'un rétrométamorphisme qui leur aurait surimposé le faciès amphibolitique.

кРАткОЕ сОцЕРжАНИЕ

НОВАь гИпОтЕжА кАцА (M. B. Katz, 1971), пО кОтОРОИ гНЕИсы И МИгМАтИты Vijaya ОБРАжОВАлИсь Иж МЕтА МОРФНых ОсАДОЧНых пО РОД сВИты Highland, пОкРыВАУЩИх ОсНОВНыЕ гОРы, пРИ БлИ жАИшЕМ РАссМОтРЕНИИ НЕ ВыДЕРжИВАЕт кРИтИкИ. пРЕжНьь тЕОРИь, пО кОтОРОИ пОР ОДы Vijaya пРОИсхОДьт Иж пРЕОБРАжОВАВшЕИсь В гРАНУлИтОВУУ ФАцИУ сЕРИИ Highland И пРЕОБР АжОВАНИь РЕтРОгРАДН ыМ МЕтАМОРФИжМОМ ДО АМФИБОлИтОВОИ ФАц ИИ, ОкАжыЕтсь спРАВЕД лИВОИ И пОДтВЕРжДАЕтсь РЕжУ льтАтАМИ НОВых пОлЕВых РАжВЕД Ок, А тАкжЕ ДАННыМИ стР УктРНОгО И ИжОтОпНОгО АНАлИжА.

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  1. A. R. Berger

    Present address: Department of Geology, Memorial University, St. John's, Newfoundland, Canada

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    Berger, A.R. The Precambrian metamorphic rocks of Ceylon: A critique of a radical interpretation. Geol Rundsch 62, 342–347 (1973). https://doi.org/10.1007/BF01840102

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