Resumen de Exhumation history of Central Madagascar, evidence from apatite fission track analysis
B. Emmel, J. Jacobs, G. Graser, T. Razakamanana
New apatite fission track data from central Madagascar reflect the basement evolution since Silurian times.
The modelled data point at three periods o f enhanced cooling during Carboniferous/ Permian, Cretaceous and Paleogene/Neogene times. The first phase ofrapid cooling is recorded in the samples from western Madagascar and is in context with the evolution o f the eastern Morondava basin shoulder. A maximum o f four km ofcrustal section must have been removed during Carboniferous/Permian times. Samples all over central Madagascar are affected by the Cretaceous phase ofrapid cooling, which reflects the break up o f East Gondwana. Since Tertiary times extensional movements caused the youngest episode o f fast cooling which is recorded in the samples from the central highland and from eastern Madagascar.
