期刊
GONDWANA RESEARCH
卷 9, 期 1-2, 页码 3-16出版社
ELSEVIER
DOI: 10.1016/j.gr.2005.10.001
关键词
Madagascar; Gondwana; Azania; tectonics; geochronology
Madagascar lay in an interesting position in Gondwana, straddling one of the largest orogens that formed as the supercontinent amalgamated. The Malagasy basement preserves a record of the timing and style of this amalgamation, and in addition contains much information as to the palaeogeography of the eastern Mozambique Ocean. Madagascar consists of a number of tectonic units that amalgamated in the Ediacaran-Cambrian. The tectonic units are: The Antongil Block; the Antananarivo Block; the Tsaratanana Sheet and the Bemarivo Belt. In addition to these, there are a number of regions dominated by Neoproterozoic metasedimentary rocks, including the Molo, Betsimisaraka, Vohibory and Androyen regions. In this review I outline these units, discuss their amalgamation history and implications for Neoproterozoic-Cambrian palaeogeography, and highlight a few key questions for future study. (c) 2005 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
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