DS10 - Défi des autres savoirs

Combining magmatic and detrital zircon records to unravel the growth of continents – Zircontinents

Submission summary

Zircontinents is a geochemistry research project coordinated by Martin Guitreau that aims at bringing new constraints on the growth of continents. The most powerful and promising approach to reconstruct continental growth is the study of the sedimentary archive through the analysis of detrital zircons. However, it remains to be demonstrated that detrital zircons accurately record the growth of continents. To solve this problem, I propose to directly compare the magmatic and the sedimentary records, deduced from igneous and detrital zircons respectively, at the scale of a crustal province. We propose to focus on the Holenarsipur Schist Belt and its vicinity (Western Dharwar Craton, India) because it contains sedimentary units that were fed by surrounding orthogneisses, and all lithological units are well-described and have good outcropping conditions. Parameters to be used in the comparisons are U-Pb, Lu-Hf, O, and Si isotopes measured by LA-(MC)-ICP-MS and SIMS because they can date continents and pertain to their sources. The proposed hosting institution is the Laboratoire Magmas et Volcans (LMV) of the Université Clermont Auvergne because 3 of the team members are affiliated to the LMV. In addition, this lab is equipped with latest generation instruments that are required for the completion of Zircontinents. The scientific team led by Martin Guitreau would be constituted by Johanna Marin-Carbonne (LMV) who is expert in Si and O isotopes, Hervé Martin (LMV) who is expert in continental crust formation, Nicolas Olivier (LMV) who is a sedimentologist with expertise in Precambrian and Phanerozoic terranes, Mudlappa Jayananda (University of Hyderabad) who is expert in the Precambrian geology of India, especially that of the Western Dharwa Craton, and Sajeev Krishnan (Indian Institute of Science, Bangalore, India) who is expert in the petrology of high-grade metamorphic rocks, especially those present in India. Zircontinents results will help better constrain the growth of continents and, therefore, the global evolution of the Earth.

Project coordination

Martin GUITREAU (Laboratoire Magmas et volcans - UMR 6524)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

CEaS IISc Center for Earth Sciences, Indian Institute of Science (Bangalore, India)
CESS Center for Earth and Space Sciences, University of Hyderabad, India
LMV Laboratoire Magmas et volcans - UMR 6524

Help of the ANR 131,845 euros
Beginning and duration of the scientific project: January 2018 - 36 Months

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