The marine paleogene of the tremp region (NE Spain)-depositional sequences, facies history, biostratigraphy and controlling factors

Eichenseer, H.; Luterbacher, Hanspeter

doi:10.1007/bf02536808

Cited by 61 publications

(44 citation statements)

References 21 publications

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“…A small interval (4 m) in the lower part of sequence IL-2 is composed of coral wacketo boundstone (Scheibner et al, 2007). Although larger foraminifera dominate both sequences, Eichenseer and Luterbacher (1992) described several isolated coralgal patch reefs within these sequences in the Tremp basin in the Central Southern Pyrenees. In addition they also described foraminiferal reef mounds built up by Solenomeris (Acervulina).…”

Section: West Carpathians (W-slovakia; 43°n Locality 4 Figs 4 5)mentioning

confidence: 95%

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Late Paleocene–early Eocene Tethyan carbonate platform evolution — A response to long- and short-term paleoclimatic change

Scheibner

Speijer

2008

Earth-Science Reviews

179

163

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The early Paleogene experienced the most pronounced long-term warming trend of the Cenozoic, superimposed by transient warming events such as the Paleocene-Eocene Thermal Maximum (PETM). The consequences of climatic perturbations and associated changes on the evolution of carbonate platforms are relatively unexplored. Today, modern carbonate platforms, especially coral reefs are highly sensitive to environmental and climatic change, which raises the question how (sub)tropical reef systems of the early Paleogene reacted to gradual and sudden global warming, eutrophication of shelf areas, enhanced CO 2 levels in an ocean with low Mg/Ca ratios. The answer to this question may help to investigate the fate of modern coral reef systems in times of global warming and rising CO 2 levels. Here we present a synthesis of Tethyan carbonate platform evolution in the early Paleogene (~59-55 Ma) concentrating on coral reefs and larger foraminifera, two important organism groups during this time interval. We discuss and evaluate the importance of the intrinsic and extrinsic factors leading to the dissimilar evolution of both groups during the early Paleogene. Detailed analyses of two carbonate platform areas at low (Egypt) and middle (Spain) paleolatitudes and comparison with faunal patterns of coeval platforms retrieved from the literature led to the distinction of three evolutionary stages in the late Paleocene to early Eocene Tethys: Stage I, late Paleocene coralgal-dominated platforms at low to middle paleolatitudes; stage II, a transitional latest Paleocene platform stage with coralgal reefs dominating at middle paleolatitudes and larger foraminifera-dominated (Miscellanea, Ranikothalia, Assilina) platforms at low paleolatitudes; and stage III, early Eocene larger foraminifera-dominated (Alveolina, Orbitolites, Nummulites) platforms at low to middle paleolatitudes. The onset of the latter prominent larger foraminifera-dominated platform correlates with the Paleocene/Eocene Thermal Maximum. The causes for the change from coral-dominated platforms to larger foraminifera-dominated platforms are multilayered. The decline of coralgal reefs in low latitudes during platform stage II is related to overall warming, leading to sea-surface temperatures in the tropics beyond the maximum temperature range of corals. The overall low occurrence of coral reefs in the Paleogene might be related to the presence of a calcite sea. At the same time larger foraminifera started to flourish after their near extinction at the Cretaceous/ Paleogene boundary. The demise of coralgal reefs at all studied paleolatitudes in platform stage III can be founded on the effects of the PETM, resulting in short-term warming, eutrophic conditions on the shelves and acidification of the oceans, hampering the growth of aragonitic corals, while calcitic larger foraminifera flourished. In the absence of other successful carbonate-producing organisms, larger foraminifera were able to take over the role as the dominant carbonate platform inhabitant, leading to a stepw...

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Section: West Carpathians (W-slovakia; 43°n Locality 4 Figs 4 5)mentioning

confidence: 95%

“…The lower Eocene deposits are either nearly barren of corals (Galala/ Egypt) or only contain solitary corals or, rarely, small isolated patch reefs (e.g. Pyrenees, Eichenseer and Luterbacher, 1992). In some areas (e.g.…”

Section: Tethyan Platform Evolutionmentioning

confidence: 99%

Late Paleocene–early Eocene Tethyan carbonate platform evolution — A response to long- and short-term paleoclimatic change

Scheibner

Speijer

2008

Earth-Science Reviews

179

163

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“…In the fossil record, several authors consider the shape and wall thickness of foraminiferal tests as a depth indicator (Kulka 1985;Eichenseer and Luterbacher 1992;Loucks et al 1998;Racey 2001;Jorry et al 2003b;Vennin et al 2003;Hasler 2004;Jorry 2004). This assumption is based on observations of LBF from present-day environments.…”

Section: Generalities On Larger Foraminiferamentioning

confidence: 99%

Hydrodynamic behaviour of Nummulites: implications for depositional models

Jorry

Hasler

Davaud

2006

Facies

117

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Large benthic foraminifers are considered to be good indicators of shallow marine carbonate environments in fossil series. Over the last 50 years, the palaeoenvironment of Tertiary Nummulites accumulations has been a matter of debate, particularly because of difficulties in interpreting these deposits, and in this way, the absence of analogues in present-day seas does not help. The aim of this paper is to insight the different ways Nummulites tests and clasts may accumulate according to their hydrodynamic behaviour. Based on experimental measurements and on SEM observations, it appears that the high primary skeletal porosity of Nummulites made them easily transportable. The calculated threshold shear velocities confirm that large-sized Nummulites can be moved by weak wave-driven currents. This peculiar hydrodynamic behaviour of Nummulites could explain the diversity of depositional models. Depending on local hydrodynamic conditions, autochthonous Nummulites deposits can be preserved as in situ winnowed bioaccumulations or be accumulated offshore, onshore or alongshore, away from the original biotope

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“…Continuous Palaeogene sections are rare and often influenced by terrigenous deposits. However, various studies show flourishing coral patch reefs during the Early Eocene (Eichenseer & Luterbacher 1992;Schuster 1996a). Bartonian successions are rare and indicate larger benthic foraminifera as major platform building organisms (Payros et al 2010).…”

Section: Circum-tethyan Carbonate Platform Evolution During the Palaementioning

confidence: 99%

Circum-Tethyan carbonate platform evolution during the Palaeogene: the Prebetic platform as a test for climatically controlled facies shifts

HÖNTZSCH¹,

SCHEIBNER²,

BROCK³

et al. 2013

Turkish J Earth Sci

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The marine paleogene of the tremp region (NE Spain)-depositional sequences, facies history, biostratigraphy and controlling factors

Cited by 61 publications

References 21 publications

Late Paleocene–early Eocene Tethyan carbonate platform evolution — A response to long- and short-term paleoclimatic change

Late Paleocene–early Eocene Tethyan carbonate platform evolution — A response to long- and short-term paleoclimatic change

Hydrodynamic behaviour of Nummulites: implications for depositional models

Circum-Tethyan carbonate platform evolution during the Palaeogene: the Prebetic platform as a test for climatically controlled facies shifts

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