Université de Fribourg

Early diagenetic imprint on temperature proxies in holocene corals: a case study from french polynesia

Rashid, Rashid ; Eisenhauer, Anton ; Liebetrau, Volker ; Fietzke, Jan ; Böhm, Florian ; Wall, Marlene ; Krause, Stefan ; Rüggeberg, Andres ; Dullo, Wolf-Christian ; Jurikova, Hana ; Samankassou, Elias ; Lazar, Boaz

In: Frontiers in Earth Science, 2020, vol. 8, p. -

Coral-based reconstructions of sea surface temperatures (SSTs) using Sr/Ca, U/Ca and δ18O ratios are important tools for quantitative analysis of past climate variabilities. However, post-depositional alteration of coral aragonite, particularly early diagenesis, restrict the accuracy of calibrated proxies even on young corals. Considering the diagenetic effects, we present new Mid to Late...

Université de Fribourg

Carbonate mounds in shallow and deep time

Henriet, Jean-Pierre ; Spezzaferri, Silvia ; Samankassou, Elias ; Foubert, Anneleen ; Van Rooij, David ; Rüggeberg, Andres

In: Marine Geology, 2011, vol. 282, no. 1-2, p. 1-4

Special Issue on COld-water CArbonate Reservoir systems in Deep Environments - COCARDEOver a decade of research on recent cold-water coral mounds in various oceans has set the stage for comparative studies between recent and ancient carbonate mound systems, with the aim to unravel generic processes and reveal the “red thread” in a fundamental strategy of Life building Geology — a...

Université de Fribourg

The influence of terrestrial run off on marine biotic communities: An example from a thrust-top carbonate ramp (Upper Pennsylvanian foreland basin, Picos de Europa, NW Spain)

Merino-Tomé, O. ; Bahamonde, Juan R. ; Samankassou, Elias ; Villa, E.

In: Palaeogeography, Palaeoclimatology, Palaeoecology, 2009, vol. 278, no. 1-4, p. 1-23

High-diversity marine biotic communities characterize the lower Kasimovian (Upper Pennsylvanian) carbonates of the Las Llacerias Formation in the Ándara Massif (Picos de Europa Province, Cantabrian Mountains, Spain). The carbonates accumulated on a small thrust-top ramp system. Within the shallow, low-energy and euphotic realms, biotic communities were characterized by abundant photozoans...

Université de Fribourg

Upper Carboniferous-Lower Permian buildups of the Carnic Alps, Austria-Italy

Samankassou, Elias

In: Permo-Carboniferous Carbonate Platforms and Reefs, 2003, p. 201-217

A variety of buildup types occur in the upper Paleozoic Auernig and Rattendorf Groups, Carnic Alps, at the present-day Austrian–Italian border, including coral, diverse algal (Anthracoporella, Archaeolithophyllum, Rectangulina, and phylloid green), bryozoan, brachiopod, and sponge buildups. Thin mounds and banks have a diverse fossil association (e.g., ...

Université de Fribourg

Cool-water carbonates in a paleoequatorial shallow-water environment: The paradox of the Auernig cyclic sediments (Upper Pennsylvanian, Carnic Alps, Austria-Italy) and its implications

Samankassou, Elias

In: Geology, 2002, vol. 30(7), p. 655

Distinct parts of limestones within the upper Paleozoic Auernig Group of the Carnic Alps, Austria and Italy, are characteristic of cool-water carbonates. The Carnic Alps were between 5°N and 10°S paleolatitude during the late Carboniferous, a position confirmed by dasyclad algae and fossil plants. The floral association, occurrence of coal seams, and absence of evaporites indicate a humid...