From passive margin to volcano-sedimentary forearc: The Tonian to Cryogenian evolution of the Anosyen Domain of southeastern Madagascar
SD Boger, W Hirdes, CAM Ferreira, B Schulte, T Jenett, CM Fanning
PRECAMBRIAN RESEARCH | ELSEVIER | Published : 2014
The Anosyen Domain of southeastern Madagascar represents a part of a vast sequence of predominantly siliciclastic and carbonaceous sedimentary and felsic volcanic rocks that can be traced from Madagascar through southern India, Sri Lanka, and into East Antarctica. We present new age and geochemical data from the Iakora and Horombe groups: units that represent the sedimentary and volcanogenic components of the Anosyen Domain. Our data demonstrate that the siliciclastic sedimentary rocks of the Iakora Group contain predominantly 2400-1600. Ma aged detrital zircon with a modal age peak at approximately 1850. Ma. This age spectrum is comparable to those reported from the majority of the other se..View full abstract
Awarded by International Development Agency
Our research was funded by the International Development Agency, Credit No. 3754 MAG. The project was undertaken under the auspices of the Projet de Gouvernance des Ressources Minerales (PRGM - Madagascar). SDB and WH gratefully acknowledge the hard work and cheerful companionship of Richard Dallwig and Ulrich Schwarz-Schampera members of the Carto Sud team not directly involved in this research. The authors also wish to acknowledge the efforts of the Malagasy geologic and support staff, in particular the efforts of Auguste Razafinjoelina and Dauphin Raharinoro, the drivers, mountain guides, and good friends of SDB. Alan Collins and an anonymous reviewer are also thanked for their constructive comments. Delia Rosel is thanked for thoroughly proof reading the final version of the manuscript.