caa a22 4500 467933928 CHVBK 20180406152951.0 cr unu---uuuuu 170328e20060301xx s 000 0 eng 10.1007/s10347-005-0039-8 doi (NATIONALLICENCE)springer-10.1007/s10347-005-0039-8 Toarcian-Kimmeridgian depositional cycles of the south-western Morondava Basin along the rifted continental margin of Madagascar [Elektronische Daten] [Markus Geiger, Günter Schweigert] After rifting and final breakup of Gondwana along the former East-African-Antarctic Orogen during the Toarcian-Aalenian, passive margins formed around the Proto-Indian Ocean. Sedimentological and stratigraphic studies in the southern Morondava Basin contribute to an improved reconstruction of palaeoenvironmental changes during the syn-rift and post-rift margin formation. Depositional models based on outcrop and literature data in combination with subsurface data sets provide a stratigraphic framework of four transgressive-regressive (T-R) cycles. The incorporation of stratal architecture models derived from seismic images is essential. After a syn-breakup T-R cycle (T-R1), the post-breakup succession commenced with a Bajocian - Early Bathonian carbonate platform (T2). Middle-Late Bathonian sandstones (R2) formed when a global sea-level fall forced the shoreline to move basinward. Incised valleys and palaeokarst known from seismic lines are typical for forced regression cycles. In the Early Callovian again a widespread transgression occurs (T3). During a short regressive phase from the Late Callovian(?) to Early Oxfordian (R3), the siliciclastic shoreface deposits prograded onto the shelf. From the Early Oxfordian onwards a transgressive trend continued (T4). T1-T3 can be explained as the response to the structural development of the breakup rifting but they follow sea-level changes observed in other parts of the world. R3 and T4, in contrast, reflect eustacy. Springer-Verlag, 2005 Madagascar nationallicence Gondwana nationallicence Post-breakup nationallicence Jurassic nationallicence T-R cycles nationallicence Geiger Markus Department of Geosciences, University of Bremen, PO Box 330440, 28334, Bremen, Germany aut Schweigert Günter Staatliches Museum für Naturkunde, Rosenstein 1, 70191, Stuttgart, Germany aut Facies Springer-Verlag 52/1(2006-03-01), 85-112 0172-9179 52:1<85 2006 52 10347 https://doi.org/10.1007/s10347-005-0039-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10347-005-0039-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Geiger Markus Department of Geosciences, University of Bremen, PO Box 330440, 28334, Bremen, Germany aut NATIONALLICENCE 700 1- Schweigert Günter Staatliches Museum für Naturkunde, Rosenstein 1, 70191, Stuttgart, Germany aut NATIONALLICENCE 773 0- Facies Springer-Verlag 52/1(2006-03-01), 85-112 0172-9179 52:1<85 2006 52 10347 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer