Neogene Cooling Events and Glacial Phases in the North Atlantic

Schaeffer, R.; Spiegler, Dorothee

doi:10.1127/zdgg/137/1986/537

Cited by 5 publications

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“…This cooling most probably corresponds to an extreme low-stand of the global sea level at the base of the Tortonian. At that time, several Ice Rafted Debris (IRD) pulses were first observed in DSDP sites of the Greenlandian Sea (Schaeffer & Spiegler, 1986). At the base of the Inden Formation, discontinuities and erosional surfaces are present in the sedimentary record.…”

Section: The Impact Of Global Climate and Sea Level Changes On The Pamentioning

confidence: 99%

Facies and paleogeography of the Tertiary of the Lower Rhine Basin - sedimentary versus climatic control

Utescher

Mosbrugger

Ashraf

2002

Netherlands Journal of Geosciences

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Based on recent studies, the impact of global sea-level and climate change on the paleogeographic and sedimentary evolution of the Tertiary of the Lower Rhine Basin is analysed. It is shown that major changes in global climate and sea-level, such as the high-stand during the Middle Miocene climate optimum, the extreme low-stands near the base of the Tortonian and within the Messinian, are clearly reflected in the sedimentary succession. Continental climate curves, as reconstructed from Tertiary macrofloras of the Lower Rhine Basin, can be correlated with the marine, long-term isotope record. As shown by the analyses, a warm and humid climate with mean annual temperatures above 13°C and mean annual precipitation not below 1000 mm, persisted throughout the Late Miocene to Early Pliocene. Continental, high-resolution, climate data show that Late Miocene alternations of lignites and elastics are rather caused by tectonic and sedimentary processes (such as the repeated migration of the river system) than by major climate changes.

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Section: The Impact Of Global Climate and Sea Level Changes On The Pamentioning

confidence: 99%

Facies and paleogeography of the Tertiary of the Lower Rhine Basin - sedimentary versus climatic control

Utescher

Mosbrugger

Ashraf

2002

Netherlands Journal of Geosciences

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Response of marine palynomorphs to Neogene climate cooling in the Iceland Sea (ODP Hole 907A)

Schreck

Méheust

Stein

et al. 2013

Marine Micropaleontology

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The present study on ODP Leg 151 Hole 907A combines a detailed analysis of marine palynomorphs (dinoflagellate cysts, prasinophytes, and acritarchs) and a low-resolution alkenone-based sea-surface temperature (SST) record for the interval between 14.5 and 2.5 Ma, and allows to investigate the relationship between palynomorph assemblages and the paleoenvironmental evolution of the Iceland Sea. A high marine productivity is indicated in the Middle Miocene, and palynomorphs and SSTs both mirror the subsequent long-term Neogene climate deterioration. The diverse Middle Miocene palynomorph assemblages clearly diminish towards the impoverished assemblages of the Late Pliocene; parallel with a somewhat gradual decrease of SSTs being as high as 20°C at~13.5 Ma to around 8°C at~3 Ma. Superimposed, palynomorph assemblages not only reflect Middle to Late Miocene climate variability partly coinciding with the short-lived global Miocene isotope events (Mi-events), but also the initiation of a proto-thermohaline circulation across the Middle Miocene Climate Transition, which led to increased meridionality in the Nordic Seas. Last occurrences of species cluster during three events in the Late Miocene to Early Pliocene and are ascribed to the progressive strengthening and freshening of the proto-East Greenland Current towards modern conditions. A significant high latitude cooling between 6.5 and 6 Ma is depicted by the supraregional "Decahedrella event" coeval with lowest Miocene productivity and a SST decline. In the Early Pliocene, a transient warming is accompanied by surface water stratification and increased productivity that likely reflects a high latitude response to the global biogenic bloom. The succeeding crash in palynomorph accumulation, and a subsequent interval virtually barren of marine palynomorphs may be attributed to enhanced bottom water oxygenation and substantial sea ice cover, and indicates that conditions seriously affecting marine productivity in the Iceland Sea were already established well before the marked expansion of the Greenland Ice Sheet at 3.3 Ma.

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A Late Miocene climate model simulation with ECHAM4/ML and its quantitative validation with terrestrial proxy data

Micheels

Bruch

Uhl

et al. 2007

Palaeogeography, Palaeoclimatology, Palaeoecology

101

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Neogene Cooling Events and Glacial Phases in the North Atlantic

Cited by 5 publications

References 0 publications

Facies and paleogeography of the Tertiary of the Lower Rhine Basin - sedimentary versus climatic control

Facies and paleogeography of the Tertiary of the Lower Rhine Basin - sedimentary versus climatic control

Response of marine palynomorphs to Neogene climate cooling in the Iceland Sea (ODP Hole 907A)

A Late Miocene climate model simulation with ECHAM4/ML and its quantitative validation with terrestrial proxy data

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