SEDIMENTARY LANDSCAPE AND PALEO-LANDSCAPES OF AN ACTIVE ENDORHEIC FORELAND BASIN: THE JUNGGAR BASIN (XINJIANG, CHINA)

Laurie Barrier (1) , Marc Jolivet (2) , Gloria Heilbronn (3) , Cécile Robin (2)

1 IPGP - Institut de Physique du Globe de Paris
2 GR - Géosciences Rennes
3 CASP

The sedimentary landscape and dynamics of foreland basins, which are shaped by the interplays between tectonics, climate, sedimentation and erosion processes, are key elements to reconstruct the evolution of orogenic systems. Therefore, a detailed understanding of the relationships between the foreland landscapes and these processes is necessary to improve our knowledge on the sedimentary record in compressive regions. In this study, we focus on the characterization of the present-day and palaeo-landscapes of an endorheic foreland basin where deformation, sedimentation and erosion are still active and easily observable: the Junggar Basin located in Central Asia. The interest of this basin resides in outstanding outcrops of its sedimentary series and structures, numerous surface and subsurface data (satellite images, digital topography, seismic profiles and drilling well data), and marked continental paleo-geographic changes through the Cenozoic. The methodology consists in coupling different approaches (geomorphology, sedimentology, sequential stratigraphy and structural geology) to characterize these paleo-geographic changes across space and through time. As a starting point, we drew a morphosedimentological map of the present-day landscape from the surface data to describe the current drainage organization and associated sedimentary environments in the basin. Then, we estab- lished several paleo-geographic maps from the surface and subsurface data to reconstruct the spatiotemporal landscape evolution since 65 Ma. In the light of previous quantifications of its control parameters (substratum deformation and sediment supplies), this evolution provides new qualitative and quantitative constraints on landscape architecture and dynamics in continental foreland contexts.

Domaines: Sciences de la Terre

Laurie Barrier, Marc Jolivet, Gloria Heilbronn, Cécile Robin. SEDIMENTARY LANDSCAPE AND PALEO-LANDSCAPES OF AN ACTIVE ENDORHEIC FORELAND BASIN: THE JUNGGAR BASIN (XINJIANG, CHINA). Association des Sédimentologistes Français. 15ème congrès français de sédimentologie, Association des Sédimentologistes Français, Oct 2015, Chambéry, France. pp.55. ⟨hal-01252079⟩