Provenance and tectonic significance of the Palaeoproterozoic metasedimentary successions of central and nothern Madagascar

B. De Waele; Ronald J. Thomas; P. H. Macey; M. S. A. Horstwood; R. D. Tucker; P. E. J. Pitfield; D. I. Schofield; K. M. Goodenough; W. Bauer; R. M. Key; C. J. Potter; R. A. Armstrong; J. A. Miller; T. Randriamananjara; V. Ralison; J. M. Rafahatelo; M. Rabarimanana; M. Bejoma

doi:10.1016/j.precamres.2011.04.004

Provenance and tectonic significance of the Palaeoproterozoic metasedimentary successions of central and nothern Madagascar

Precambrian Research

By: B. De Waele, Ronald J. Thomas, P. H. Macey, M. S. A. Horstwood, R. D. Tucker, P. E. J. Pitfield, D. I. Schofield, K. M. Goodenough, W. Bauer, R. M. Key, C. J. Potter, R. A. Armstrong, J. A. Miller, T. Randriamananjara, V. Ralison, J. M. Rafahatelo, M. Rabarimanana, and M. Bejoma

https://doi.org/10.1016/j.precamres.2011.04.004

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Abstract

New detrital zircon U–Pb age data obtained from various quartzite units of three spatially separated supracrustal packages in central and northern Madagascar, show that these units were deposited between 1.8 and 0.8 Ga and have similar aged provenances. The distribution of detrital zircon ages indicates an overwhelming contribution of sources with ages between 2.5 and 1.8 Ga. Possible source rocks with an age of 2.5 Ga are present in abundance in the crustal segments (Antananarivo, Antongil and Masora Domains) either side of a purported Neoproterozoic suture (“Betsimisaraka Suture Zone”). Recently, possible source rocks for the 1.8 Ga age peak have been recognised in southern Madagascar. All three supracrustal successions, as well as the Archaean blocks onto which they were emplaced, are intruded by mid-Neoproterozoic magmatic suites placing a minimum age on their deposition. The similarities in detrital pattern, maximum and minimum age of deposition in the three successions, lend some support to a model in which all of Madagascar's Archaean blocks form a coherent crustal entity (the Greater Dharwar Craton), rather than an amalgamate of disparate crustal blocks brought together only during Neoproterozoic convergence. However, potential source terranes exist outside Madagascar and on either side of the Neoproterozoic sutures, so that a model including a Neoproterozoic suture in Madagascar cannot be dispelled outright.

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Additional publication details
Publication type	Article
Publication Subtype	Journal Article
Title	Provenance and tectonic significance of the Palaeoproterozoic metasedimentary successions of central and nothern Madagascar
Series title	Precambrian Research
DOI	10.1016/j.precamres.2011.04.004
Volume	189
Issue	1-2
Year Published	2011
Language	English
Publisher	Elsevier
Publisher location	Amsterdam, Netherlands
Contributing office(s)	Central Energy Resources Science Center
Description	25 p.
First page	18
Last page	42
Country	Madagascar
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