Objective
An understanding of the controls on incongruent release of hafnium (Hf) during chemical weathering provides the key for the interpretation of past Hf seawater isotopic compositions, which are recorded in authigenic marine sediments. These records, in turn, integrate the weathering signal from the continents, containing valuable information about rates of chemical weathering in the past, with links to atmospheric CO2 drawdown and long-term climate change. To date, three different hypotheses have been proposed to explain the incongruent weathering of Hf. Traditionally, it has been related to the resistance of zircons to weathering. Their retention of unradiogenic Hf, however, has been suggested to be reduced during times of intense physical weathering, indicating that Hf isotopes allow the reconstruction of the intensity of physical weathering in the past. Recently, it was suggested that the preferential release of radiogenic Hf by high lutetium/Hf silicate accessory phases controls the incongruency of Hf weathering. This implies fast temporal evolution of the released Hf isotopic compositions with soil age as these phases are easily weathered and become depleted. Lastly, there is evidence that carbonate weathering is also significant for the oceanic Hf budget. The Hf isotopic evolution of seawater in the past could thus reflect the changes in the relative weathering contributions of unradiogenic silicates and radiogenic carbonates. The research seeks to obtain a detailed understanding of the processes that control the release of Hf isotopes from the continents by studying soil chronosequences and stream waters that drain variable lithologies under variable climatic conditions. The new observations will allow a more robust interpretation of seawater Hf isotope records, so that the information they contain on the character and rate of past weathering and its inferred effect on atmospheric CO2 can be better exploited.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences earth and related environmental sciences geology lithology
- natural sciences chemical sciences inorganic chemistry inorganic compounds
- natural sciences chemical sciences inorganic chemistry transition metals
- natural sciences earth and related environmental sciences atmospheric sciences climatology climatic changes
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Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
FP7-PEOPLE-2009-IEF
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Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
BS8 1QU BRISTOL
United Kingdom
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.