book chapter · Geophysical monograph
The Late Triassic to Early Jurassic Magmatic Province of Morocco and Portugal forms a notable volcanic sub-province within the Central Atlantic Magmatic Province. This geologic domain consists of continental basaltic successions, featuring subaerial lava flows, pyroclastic deposits occasionally laid down in lacustrine environments, and associated feeder dikes and sills. These volcanic rocks are interbedded with clastic sedimentary sequences preserved across elongated rift basins. Paleontological dating of the sediments indicates ages spanning from the Upper Ladinian to Lower Carnian through to the Sinemurian, whereas argon-argon dating of the volcanics provides an average age of roughly 200 million years. The basaltic rocks are characterised as low-titanium, indicating a possible origin within the continental lithospheric mantle. Furthermore, the initiation of the regional rifting process likely originated at two distinct triple junctions, situated near Florida and between Africa, Iberia, and America.
Understanding the volcanic successions of Morocco and Portugal helps clarify the geological evolution of the Central Atlantic Magmatic Province and the breakup of ancient supercontinents. Examining rock ages, depositional environments, and mantle sources provides Earth scientists with critical evidence about how continental rifting initiated and unfolded across Africa, Iberia, and North America during the transition between the Triassic and Jurassic periods.
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An overview on the Late Triassic-Early Jurassic Magmatic Province of Morocco and Portugal (TJMPMP) is presented. It comprises extrusive basalts, interbedded with clastic rocks sequences preserved in elongated rift basins, and their feeder dikes and sills. Paleontologic ages range from Upper Ladinian-Lower Carnian to the Sinemurian for the sediments, while available 40 Ar/ 39 Ar analysis yield a mean age of 200±1,6 Ma for the volcanics. The volcanologic characteristics of the TJMPMP are those of continental basaltic successions. It comprises subaerial lava flows and pyroclastic deposits, sometimes deposited in lacustrine environments, and feeder dikes, constituting an interesting volcanic sub-province of the Central Atlantic Magmatic Province (CAMP) as most preserved outcrops are extrusive volcanics. These rocks correspond to Low-Ti (TiO 2 11 suggesting that their source may be within the continental lithospheric mantle. The nucleation of the rifting process may have started at two different triple junctions, an RRR junction near Florida and a RRT between Africa-Iberia-America.
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DOI: 10.1029/136gm010
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