Zusammenfassung
In den westafrikanisch-brasilianischen und südafrikanischen Bereichen Gondwanalands lÄ\t sich ein archaischer — unterer protezoischer — mobiler Gürtel erkennen, der sich von der Kasila Group von Sierra Leone über den Goias Gürtel Zentral-Brasiliens bis zum Namaqua Mobile Belt von Namibia (KGN) erstreckt. Dieser Gürtel ist charakterisiert durch hohe Spannungsdeformation und hochgradige Metamorphose. Er könnte einen mobilen Gürtel mit Transformschub darstellen. Scherbewegung und Verstellung entlang der KGN wÄhrend des PrÄkambriums hatten die Älteren Kratone erfa\t und kontrollierten grö\ere sekundÄre Dehnungs- und Schergürtel, die heute als jüngere mobile Gürtel des Proterozoikums angesprochen werden.
Abstract
An Archaean-Lower Proterozoic mobile belt can be recognized in the West African — Brazilian — Southern African portions of Gondwanaland extending from the Kasila Group of Sierra Leone, through the Goias Belt of Central Brasil to the Namaqua Mobile Belt of Namibia (KGN). This belt is characterised by high shear strain deformation and high grade metamorphism and may represent a transform-shear mobile belt. Shear movement and displacement along the KGN during the Precambrian has affected the older cratons and controlled major secondary tensional and shear belts which are now recognized as younger Proterozoic mobile belts.
Résumé
Une zone mobile d'âge archéen-protérozoÏque inférieur peut Être reconnue dans les parties du Gondwanaland de l'Afrique occidentale-Brésil-Afrique méridionale, depuis le Groupe de la Sierra Leone, en passant par la ceinture de Goia du Brésil central, jusqu'à la ceinture mobile de Namibie (KGN). Cette ceinture est caractérisée par une déformation cisaillante fortement prononcée et par un degré de métamorphisme élevé; elle peut représenter une ceinture mobile de faille transformante. Des mouvements de cisaillement et de déplacement de la KGN durant le Précambrien ont affecté les vieux cratons et ont conditionné les ceintures secondaires principales du point de vue de leur tension et de leur cisaillement, lesquelles sont maintenant reconnues comme des ceintures mobiles du ProtérozoÏque récent.
кРАткОЕ сОДЕРжАНИЕ
ОстАткИ ОтлОжЕНИИ гО НДВАНы НАИДЕНы В пОДВ ИжНых пОьсАх ВОжРАстА АРхЕ ИНИжНИИ пРОтЕРОжОИ, В жАпАДНО И АФРИкЕ, БРАжИлИИ И Уж НОИ АФРИкЕ, А ИМЕННО:кАк гРУппА кА сИлА В сИ ЕРРА лЕОНЕ, пОьс гОИАж цЕНтРАльНОИ БРАжИлИ И И пОДВИжНыИ пОьс НАМА кА В НАМИБИИ (кгН). ЁтОт пОьс хАРАктЕРИжУЕтсь сИльНОИ ДЕФОРМАцИЕИ И ВысОкОИ стЕпЕНьУ МЕ тАМОРФИжМА. ОН МОжЕт пРЕДстАВльт ь сОБОИ пОДВИжНыИ пОьс. пРОцЕссы ДЕФОРМАцИИ И сДВИгИ ВДОль лИНИИ кгН ОхВАтыВАлИ И ДРЕВ НИЕ кРАтОНы, А тАкжЕ кОНтРОлИРОВАлИ БОль шИЕ ВтОРИЧНыЕ пОьсА РАстьжНИИ И жОН ы скОлА, кОтОРыЕ сЕгОД Нь РАссМАтРИВАУт, кАк пОДВИжНыЕ жОНы В пЕРИ ОД пОжДНЕгО пРОтЕРОж Оь.
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Katz, M.B. A shear-mobile transform belt in the Precambrian Gondwanaland of Africa — South America. Geol Rundsch 70, 1012–1019 (1981). https://doi.org/10.1007/BF01820177
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DOI: https://doi.org/10.1007/BF01820177