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Moly-OAEs

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Global redox state of the ocean during Cretaceous oceanic anoxic events new ins...

Global redox state of the ocean during Cretaceous oceanic anoxic events new insights from molybdenum isotopes The main goal of this proposal is in the investigation of the relationship between major perturbations in the carbon cycle and the global extent of euxinia during three Cretaceous oceanic anoxic events (OAEs), with important impli... ver más

30/04/2013

UNIVERSITY OF BRIS...

200K€

Presupuesto del proyecto: 200K€

Líder del proyecto

UNIVERSITY OF BRISTOL No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Fecha límite participación Sin fecha límite de participación.

Financiación concedida El organismo FP7 notifico la concesión del proyecto el día 2013-04-30 No tenemos la información de la convocatoria

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1 Participantes

UNIVERSITY OF BRISTOL

0.00€ | Lider

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Líder del proyecto

UNIVERSITY OF BRISTOL No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Presupuesto del proyecto 200K€

Fecha límite de participación Sin fecha límite de participación.

Descripción del proyecto The main goal of this proposal is in the investigation of the relationship between major perturbations in the carbon cycle and the global extent of euxinia during three Cretaceous oceanic anoxic events (OAEs), with important implications for the temporal evolution of ocean chemistry and for the better understanding of interactions between environmental change and the physical state of the oceans. By providing detailed analyses of both Tethyan key sections and ODP legs, we seek to better constrain the onset and the duration of reducing conditions and relate these changes to the perturbations of the global carbon cycle during the Valanginian, the early Aptian and the Cenomanian/Turonian OAE. We propose to investigate the behaviour of molybdenum (Mo) isotopes during these three periods of time. Mo isotopes provide a method to assess whole ocean chemistry from a limited numbers of sites. In the modern ocean, the preferential removal of the lighter isotopes under oxic conditions dominates, leading to a heavy Mo isotope signature for residual Mo in seawater. During OAEs, the emplacement of a larger completely anoxic sink diminished the dominance of oxic sinks. As a consequence the Mo isotope signature of seawater decreased towards that of the input. Thus, marine sediments deposited under euxinic conditions are thought to record the Mo isotopic composition of seawater at that time. From this, it is possible to estimate the proportion of euxinic areas in ancient oceans using a quantitative model of Mo isotopic balance. The importance of this project lies in the observation that Cretaceous OAEs are related to phases of rapid global environmental change. This is all the more important since most of the processes to explain the origin of OAEs during the Cretaceous - such as global warming, increased continental weathering, increased oceanic productivity and the disappearance of reef systems are observed today as the consequence of anthropogenic change.

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