Kuss, Jochen
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Kuss, Jochen
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Kuss, Jochen
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Item-typ:Veröffentlichung, Palaeoenvironmental evolution of the Tunisian carbonate platform margin: Response to global oceanographic and climatic changes (Barremian-Aptian)(2008-12-04); ; ; The Late Barremian-Late Aptian interval was characterised by several major changes in the ocean/climate system related to the onset of the Mid-Cretaceous greenhouse world. North African sedimentary deposits offer excellent archives of the ecological changes on the southern Tethys continental margin during this time interval. In the present phD thesis sedimentology, palaeontology, biostratigraphy, chemostratigraphy, and geochemistry are combined to reconstruct the palaeoenvironmental evolution and sea-level changes of the Tunisian carbonate platform margin. Respect is paid to major palaeoceanographic and palaeoclimatic events including the late Early Aptian Oceanic Anoxic Event 1a (OAE 1a) and two time intervals associated with widespread carbonate platform drowning in the early- and mid-Late Aptian. The last chapter deals with the cephalopod fauna of the platform margin. Results of the detailed regional investigations are compared to global marine palaeoenvironments and discussed in a broad geological context.Dissertation609 174 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Sedimentary and stratal patterns in Jurassic successions of western Madagascar : Facies, stratigraphy, and architecture of Gondwana breakup and drift sequences(2004-11-09); ; ; The breakup of Gondwana along the former East African Orogen is widely interpreted to have lasted from the Late Palaeozoic to the Callovian. The present study indicates that the Permian-Triassic or Karoo phase of rifting was not responsible for the separation of East- and West-Gondwana, since that rift system failed in the Late Triassic. Instead the breakup of Gondwana occurred in the Late Liassic. The pre-rift phase in the Morondava Basin is represented by the Karoo deposits, and the syn-rift phase is recorded by Toarcian marine shales, locally overlain by Aalenian sandstones. A major Early Bajocian unconformity is interpreted as the breakup unconformity. The initial post-rift or drift phase is represented by the Bajocian-Bathonian carbonates, marls and sandstones of coastal plain environment and a coastal barrier/lagoon complex. During the Bathonian the siliciclastic shoreface system moved basinward. Callovian-Early Kimmeridgian shales with interbedded iron-oolites represent a shallow-deeper shelf system, in which a Lower Oxfordian shoreface sandstone is intercalated. Based on outcrop and literature data in combination with subsurface data sets four transgressive-regressive (T-R) cycles within the syn-and post-breakup successions were recognised: T-R1 cycle is represented by the Toarcian shales and the Aalenian sandstones. After breakup a widespread flooding formed the Bajocian carbonate platform (T2), followed by the Bathonian sandstones (R2) when a sea-level fall forced the siliciclastic shoreline to move basinward. In the Early Callovian again a widespread transgression established shelf conditions (T3). During a short regressive phase during the Early Oxfordian (R3), siliciclastic shoreface deposits prograded onto the shelf. From the Early Oxfordian onwards a transgressive trend continued (T4). The recognised T-R cycles are generally consistent with sea-level changes observed in other parts of the world and are therefore interpreted to reflect eustacy.Dissertation325 158 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Early Paleogene environmental turnover in the southern Tethys as recorded by foraminiferal and organic-walled dinoflagellate cysts assemblages(2005-04-25); ; ; Within this research, I investigated the environmental change of the marine ecosystem on the continental margin of the Southern Tethys during the early Paleogene. In particular, my project portrayed how the marine ecosystem reacted to the Paleocene Eocene thermal maximum (~55 Ma) and explored a possible hyperthermal event during the middle Paleocene, across the Danian-Selandian transition (61-59 Ma). Several localities located along paleobathymetric transects (from middle neritic to upper bathyal) in Jordan, Egypt and Tunisia have been investigated. Considering that a multi-proxy approach is preferable for a most reliable reconstruction, I evaluated different microbiotic groups from the surface water (organic dinocysts and planktic foraminifera) and from the sea floor (benthic foraminifera); in addition to geochemical proxies (oxygen and carbon stable isotopes and carbonate content). Considering multi-proxy observations, climatic and environmental changes across these intervals of biotic turnover are investigated, unravelling possible similarities between these two events.Dissertation406 105