Fig. 6: Late Carboniferous to Early Jurassic paleogeographic reconstructions of southwestern Pangea.
From: Catastrophic slab loss in southwestern Pangea preserved in the mantle and igneous record
a Maps illustrating the paleogeographic modifications of the plate margin before, during, and after the emplacement of the Choiyoi Magmatic Province. These maps show the spatiotemporal relation between the emplacement of the early magmatic activity of the Choiyoi Magmatic Province and the marine disconnection between the Panthalassa Ocean and the backarc basins in Pangea and the Late Permian continentalization during the Choiyoi magmatic flare-up3,92,93. These processes are here interpreted as triggered by surface uplift ≥1 km caused by the large-scale slab-break-off associated with the emplacement of the Choiyoi SLIP. The maps also illustrate the close spatiotemporal relation between the subduction restoration in the Late Triassic-Jurassic and the recovery of marine ingressions in the Pangea margin98. The latter is here interpreted as produced in part by the reactivation subduction-related dynamic subsidence in this area. Inset in Permian maps is a paleoclimatic simulation at the Kungurian (279.3–272 Myr)95 reproducing orographic precipitation associated with the Choiyoi paleotopography. b Averaged eustatic sea-level curve from Carboniferous to Jurassic times96 with references to the geological events discussed in this study. Gray envelope corresponds to the extrema.
