Comparison of the Jurassic and Cretaceous sedimentary cycles of Somalia and Madagascar: implications for the Gondwana breakup |
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| Authors: | Peter Luger M Gröschke M Bussmann A Dina W Mette A Uhmann H Kallenbach |
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| Institution: | (1) Fachbereich 5 (Geowissenschaften), Universität Bremen, Bibliotheksstrasse, D-28359 Bremen, Germany;(2) SFB 69, Technische Universität Berlin, Ackerstrasse 71, D-13355 Berlin, Germany;(3) Institut für Paläontologie, Universität Würzburg, Pleicherwall 1, D-97070 Würzburg, Germany;(4) SFB 69, Technische Universität Berlin, Ackerstrasse 71, D-13355 Berlin, Germany |
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| Abstract: | The Jurassic and Cretaceous sedimentary history of northern Somalia and the Morondava Basin of south-western Madagascar have been studied. Both regions display an independent facial development; however, a comparison of the sequential evolution of the Mesozoic sedimentary successions in these two presently widely separated areas reveals a surprisingly high level of similarity, which probably reflects major events during the disintegration of Eastern Gondwana during the Jurassic and Cretaceous. Although in Jurassic times the onset of transgressions and regressions in both areas compares well with eustatic development, major deviations in combination with the tectonic activities of different degrees are observed in the Early and Late Cretaceous synchronously in both regions. Transgressions are observed in Toarcian, Bajocian (not dated in northern Somalia), Callovian, Valanginian (Madagascar only), Aptian and Campanian times. Tectonism is noted before the Aptian and Campanian transgressions in northern Somalia and the Morondava Basin of south-western Madagascar. |
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| Keywords: | Cretaceous Jurassic Gondwana Madagascar Somalia sea-level changes sedimentary cycles |
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