Carbon isotope evidence for sedimentary discontinuities in the lower Toarcian of the Lusitanian Basin (Portugal): Sea level change at the onset of the Oceanic Anoxic Event

The Toarcian Oceanic Anoxic Event, also known as the Jenkyns Event, was a hyperthermal episode which occurred during the early Toarcian (c. 183 Ma; Early Jurassic) and resulted in numerous collateral effects including global warming, enhanced weathering, sea-level change, carbonate crisis, marine anoxia–dysoxia, and a second-order mass extinction. This volume presents the last advances for understanding early Toarcian environmental changes through different disciplines: biostratigraphy, micropalaeontology, palaeontology, ichnology, palaeoecology, sedimentology, integrated stratigraphy, inorganic, organic and isotopic geochemistry, and cyclostratigraphy. The study of this abrupt climate change is critical for predicting future global changes, and for understanding the complex biogeochemical interactions through time between geosphere, atmosphere, hydrosphere and biosphere.

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Terminal Ordovician carbon isotope stratigraphy and glacioeustatic sea-level change across Anticosti Island (Quebec, Canada)

Geological Society of America Bulletin ◽

10.1130/b30323.1 ◽

2011 ◽

Vol 123 (7-8) ◽

pp. 1645-1664 ◽

Cited By ~ 57

Author(s):

D. S. Jones ◽

D. A. Fike ◽

S. Finnegan ◽

W. W. Fischer ◽

D. P. Schrag ◽

...

Keyword(s):

Sea Level ◽

Carbon Isotope ◽

Sea Level Change ◽

Carbon Isotope Stratigraphy ◽

Level Change ◽

Isotope Stratigraphy ◽

Anticosti Island

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A high-resolution carbon-isotope record of the Turonian stage correlated to a siliciclastic basin fill: Implications for mid-Cretaceous sea-level change

Palaeogeography Palaeoclimatology Palaeoecology ◽

10.1016/j.palaeo.2014.03.033 ◽

2014 ◽

Vol 405 ◽

pp. 42-58 ◽

Cited By ~ 28

Author(s):

D. Uličný ◽

I. Jarvis ◽

D.R. Gröcke ◽

S. Čech ◽

J. Laurin ◽

...

Keyword(s):

High Resolution ◽

Sea Level ◽

Carbon Isotope ◽

Sea Level Change ◽

Level Change ◽

Isotope Record ◽

Basin Fill

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High-resolution correlation of the Homerian carbon isotope excursion (Silurian) across the interior of the Midland Platform (Avalonia), UK

Geological Magazine ◽

10.1017/s0016756819001146 ◽

2019 ◽

Vol 157 (4) ◽

pp. 603-620

Author(s):

David C. Ray ◽

Emilia Jarochowska ◽

Philipp Röstel ◽

Graham Worton ◽

Axel Munnecke ◽

...

Keyword(s):

High Resolution ◽

Sea Level ◽

Carbon Isotope ◽

Depositional Environment ◽

Sea Level Change ◽

The West ◽

Relative Sea Level ◽

Level Change ◽

Carbon Isotope Excursion ◽

West Midlands

AbstractNew δ13Ccarb and microfacies data from Hereford–Worcestershire and the West Midlands allow for a detailed examination of variations in the Homerian carbon isotope excursion (Silurian) and depositional environment within the Much Wenlock Limestone Formation of the Midland Platform (Avalonia), UK. These comparisons have been aided by a detailed sequence-stratigraphic and bentonite correlation framework. Microfacies analysis has identified regional differences in relative sea-level change and indicates an overall shallowing of the carbonate platform interior from Hereford–Worcestershire to the West Midlands. Based upon the maximum δ13Ccarb values for the lower and upper peaks of the Homerian carbon isotope excursion (CIE), the shallower depositional setting of the West Midlands is associated with values that are 0.7 ‰ and 0.8 ‰ higher than in Hereford–Worcestershire. At the scale of parasequences the effect of depositional environment upon δ13Ccarb values can also be observed, with a conspicuous offset in the position of the trough in δ13Ccarb values between the peaks of the Homerian CIE. This offset can be accounted for by differences in relative sea-level change and carbonate production rates. While such differences complicate the use of CIEs as a means of high-resolution correlation, and caution against correlations based purely upon the isotopic signature, it is clear that a careful analysis of the depositional environment can account for such differences and thereby improve the use of carbon isotopic curves as a means of correlation.

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