Detrital zircon U-Pb provenance and palaeogeography of Triassic rift basins in the Marrakech High Atlas

作者：Domenech Mireia^*; Stockli Daniel F; Teixell Antonio

来源：Terra Nova, 2018, 30(4): 310-318.

DOI：10.1111/ter.12340

The Marrakech High Atlas contains some of the best exposures of the Triassic early-rift strata related to Atlantic opening in NW Africa. We present the first detrital zircon U-Pb data of five Triassic redbed samples from the Tizi n'Test basin to quantify sediment provenance, transport and dispersal patterns during early rifting. These U-Pb ages document dominant sediment sourcing from the south, the Anti-Atlas domain, with very limited to absent input from the Variscan Meseta domain to the north. This combined with stratigraphic and thermochronologic information points to a highly asymmetric palaeogeography during Triassic rifting. Furthermore, the occurrence of Archaean detrital zircon grains in Triassic sandstone, likely recycled from the Reguibat shield, suggests the presence of a fully developed regional drainage system with rivers and catchments reaching hundreds of kilometres into the hinterland of the rift flank.

• 出版日期2018-8