A Late Permian paleopole from the Ikakern Formation (Argana basin, Morocco) and the con fi guration of Pangea

The nearly 2000 m-thick Ikakern Formation is the basal sedimentary unit in the Argana basin of Morocco, consisting of fluvial red and purple conglomerates in the lower part and interbedded red conglomerates, sandstones, siltstones and mudstones in the upper part. It unconformably overlies deformed and metamorphosed Variscan basement rocks and is unconformably overlain by the finer grained lacustrine to fluvial sediments of the?Early to Late Triassic Timesgadiouine Formation. Vertebrate fossil and chronostratigraphic constraints indicate a post-Kiaman, Late Permian age for at least the sampled upper member (t2) of the Ikakern Formation. A stable, high unblocking temperature dual polarity characteristic magnetization that passes a local fold test gives a paleomagnetic pole for 14 sites at 48.8 degrees N 246.3 degrees E A95 = 7.2 degrees after correction for inclination flattening and indicates a paleolatitude of 14 degrees N for the nominal sampling location at 30.75 degrees N 9.10 degrees W. The Ikakern pole agrees well with poles of similar age deemed reliable in a recent assessment of published data from South America, Africa, Adria, and Australia, which together (N = 7) provide a mean Gondwana pole for an age bin centered on 260 Ma at 52.2 degrees N 239.8 degrees E A95 = 5.0 degrees (NW Africa coordinates). In conjunction with a robust mean 260 Ma pole form Laurasia, these results confirm a Pangea A configuration for the Late Permian. This is in contrast to some recently published interpretations of paleomagnetic data from the Gondwanides of South America that would prolong the existence of a Pangea B configuration from the Late Carboniferous-Early Permian through the Late Permian but which instead probably reflect effects of remagnetization or local rotation. (c) 2021 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

Automated summary

The Ikakern Formation in Morocco's Argana basin is a significant basal sedimentary unit, providing valuable paleomagnetic information and indicating a Late Permian age post-Kiaman event. Its magnetic pole, consistent with similar age poles from various continents, confirms the existence of a Pangea A configuration during the Late Permian.