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In situ LA‑ICP‑MS U-Pb titanite dating of Na-Ca metasomatism in orogenic belts: the North Pyrenean example

Abstract : In the Pyrenees, in association with the rotation of the Iberian plate around Europe during the Mid- Cretaceous, a Na-Ca metasomatism is recognized as a complementary record of the hydrothermal activity that led to Na-metasomatism (albitization) and talc-chlorite mineralization. It affected metasedimentary rocks as well as Hercynian granites. In situ laser ablation ICP-MS U-Pb analyses of titanite grains formed in albitites during metasomatism date the Na-Ca metasomatism between 110 and 92 Ma. The temperature of the Na-Ca metasomatism is estimated to be approximately 550 °C. Both the time constraints and temperature estimates suggest that the Na-Ca metasomatism is related to the low-P high-T North Pyrenean metamorphism.
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https://hal-insu.archives-ouvertes.fr/insu-00965320
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Submitted on : Tuesday, March 25, 2014 - 9:49:36 AM
Last modification on : Monday, May 16, 2022 - 8:20:25 AM

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Sylvain Fallourd, Marc Poujol, Philippe Boulvais, Jean-Louis Paquette, Michel de Saint Blanquat, et al.. In situ LA‑ICP‑MS U-Pb titanite dating of Na-Ca metasomatism in orogenic belts: the North Pyrenean example. International Journal of Earth Sciences, Springer Verlag, 2014, 103 (3), pp.667-683. ⟨10.1007/s00531-013-0978-1⟩. ⟨insu-00965320⟩

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