Continental Triassic in Argentina: response to tectonic activity

In Argentina, continental Triassic sediments occur in many sedimentary basins. They overlie a complex basement consisting of several terranes. The sediments form cycles at different scales. Small-scale cycles, such as point bar fining upward sequences, are common structures. Large-scale cycles, covering several lithostratigraphic formations, and middle-scale cycles, which create the formations or parts thereof, indicate uplift pulses of the basin hinterlands or the respective terranes, respectively. The middle-scale cycles also may be connected with volcanic events. The uplift pulses in the different terranes occurred, with few exceptions, independently of one another and were a main controlling factor in the evolution of the basins. work and pebble, modal, and geochemical analyses provide a differentiated view of the evolution of the Triassic sedimentary basins in space and time. In general, the sediments were derived from traceable stable blocks. In the Marayes-Desagüadero basin, the Rincَn Blanco section (Cuyo basin), Malargüe basin, and perhaps the Deseado massif, the sources include magmatic arcs and a variety of terranes.