Postdoctoral contracts for this year. You can apply for to scientific persons in charge.
1) COPS - Paleo-currents and sedimentary records
Scientific header: Daniel Aslanian (LGS) (aslanian@ifremer;fr) / Camille Lique (LOPS) (Camille.Lique@ifremer.fr)
Palaeo-currents and sedimentary records
Ocean currents, expressed from the continental shelves up to the abyssal plains, have an essential influence on the climate and sedimentary records. However, the modelisation of the palaeo-currents of the time is rarely based on real paleoceanographic data (Palaeobathymetry, plate tectonic, palaeotopography…): ocean palaeo-currents are still so poorly understood. We propose to address this issue by combining the efforts of oceanographers, sedimentologists and géodynamiciens, and realize the first model of global order based on real paleoceanographic data, over a period of time ranging from 200 Ma to present, on key periods (changes cinematic phases or opening / closing straits). The methodology will first focus on the key period of the Ypresian then applied to several stages of evolution since the break up of Pangea.
Keywords: Paleo-oceanography, modeling, Palaeoclimate, sedimentology, Earth Geodynamics.
2) Seismic anisotropy of the crustal and lithospheric mantle of Madagascar and Mozambique
Scientific header: Mikael Evain (firstname.lastname@example.org)
Seismic anisotropy of the crustal and lithospheric mantle of Madagascar and Mozambique.
This study aims at improving our understanding of anisotropic structures of the lithosphere (crust and mantle) beneath Madagascar and Mozambique. These lead to constrain the dynamic of the lithosphere which in interaction with surface processes strongly influence the topographic evolution. The study area is indeed characterised by high standing plateaus within a global extensive geodynamical context since the Gondwana dislocation and the opening of the Indian Ocean. Recent geophysical studies show a correlation between regions of highest topography with the presence of deep magmatic bodies. However, the characterisation of such features is still limited and the understanding of their origin and their evolution still highly debated. We propose here to shed new lights on the deep structure and the lithosphere dynamic by applying a new methodology of passive seismology to a set a data coming from a two years deployment of at least 26 broadband seismometers. (MACOMO project) The task will consist of a joint inversion of surface waves and receiver functions by focussing on seismic anisotropy signals, which are indicators of the presence of dipping interface and/or material that was subject to deformation.
Key words: Lithospheric structure, seismic anisotropy, interactions between deep and shallow processes