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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Tectonic framework of the Precambrian of Madagascar and its Gondwana connections: a review and reappraisal
Geologische Rundschau, Volume 83, No. 3, Year 1994
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Description
The Precambrian of Madagascar is divided into two sectors by the north-west trending sinistral Ranotsara shear zone, which continues in the Mozambique belt, probably as the Surma shear zone, and in Southern India as the Achankovil shear zone. South of Ranotsara six north-south trending tectonic belts are recognized that consist largely of granulite and high amphibolite facies paragneisses, phlogopite diopsidites, concordant granites and granulites. North of Ranotsara the central-northern segment is traversed by a north-trending axial 100-150 km wide dextral shear zone of probable Pan-African age, which was metamorphosed under granulite and high amphibolite facies conditions and which has reworked older basement. This shear zone continues across southern India as the Palghat-Cauvery shear zone. Major stratiform basic -ultrabasic complexes occur in the axial zone and in the basement to the west. Well preserved low grade continental margin-type sediments (quartzites, mica schists and stromatolitic marbles) of Kibaran age are present in western Madagascar. Two partly greenschist grade sedimentary groups lie unconformably on high grade basement in north-east Madagascar. Isotopic age data suggest the presence in Madagascar of Archaean, Early and Mid-Proterozoic crustal material that was extensively reworked in Pan-African times. © 1994 Springer-Verlag.
Authors & Co-Authors
Brian F. Windley, Brian Frederick
United Kingdom, Leicester
University of Leicester
Razafiniparany, A.
Madagascar
Laboratoire de Géologie
Razakamanana, Théodore
Madagascar, Tulear
Université de Toliara
Ackermand, Dietrich
Germany, Kiel
Christian-albrechts-universität zu Kiel
Statistics
Citations: 114
Authors: 4
Affiliations: 4
Identifiers
Doi:
10.1007/BF01083234
ISSN:
00167835
e-ISSN:
14373262
Study Locations
Madagascar
Mozambique