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

November 9, 2011

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.

Citation Information

Publication Year 2011
Title Provenance and tectonic significance of the Palaeoproterozoic metasedimentary successions of central and nothern Madagascar
DOI 10.1016/j.precamres.2011.04.004
Authors 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
Publication Type Article
Publication Subtype Journal Article
Series Title Precambrian Research
Series Number
Index ID 70004694
Record Source USGS Publications Warehouse
USGS Organization Central Energy Resources Science Center