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Weathering regime associated with subsurface circulation on volcanic islands

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Abstract

Volcanic islands, being characterized by highly porous basaltic/andesitic lava flows and pyroclastic deposits, are subject to important chemical weathering by subsurface waters. Moreover, such subsurface weathering is impacted by hydrothermal springs in both active and non-active volcanic areas, thus increasing dissolved load concentrations. Here, we focus on the subsurface water chemistry in the volcanic islands of the Lesser Antilles and Réunion and on the origin of these subsurface flows. We are able, through the use of various isotopic tools (C, Sr, U–Th), to identify hydrothermal influences in river water. For example, Li concentrations show a positive correlation with temperature of hot and cold springs and also a relationship with δ13C; from this, we can show that several sources of hydrothermal activity influence the rivers of the Lesser Antilles and that some rivers also reveal an important organic influence. As much as 20% of the subsurface hydrothermal springs go to feed the rivers. The increasing temperatures result in more dissolved elements being mobilized and an increase in chemical weathering rates. In addition, using the (230Th/238U) isochron for the well and river dissolved loads in Martinique, Guadeloupe and Réunion, we can evaluate residence times in the river water, i.e. the average residence time in the water along the circulation path to the sampling point. Alteration takes longer when the water circulates through thick soil, for example, 400–5,000 years when circulating under an ash profile and 1,200–15,000 years when circulating through a collapse zone. It would appear that waters circulation is globally three times longer for subsurface water than for surficial water. The weathering regime in tropical volcanic environments seems to be controlled mainly by such subsurface circulation with high chemical concentration from hydrothermal inputs. The origin of these compositions is varied and not controlled by a single hydrothermal spring. Consequently, it is subsurface circulation that determines the weathering regime in tropical volcanic islands with the main controlling parameters being temperature and residence time.

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Acknowledgments

We thank Caroline Gorge, who carried out major, trace and Sr-isotope analyses on VG and Francoise Capmas who carried out Sr-isotope analyses on Triton. We also thank Pascale Louvat for her helpful discussions on volcanic island weathering and Christa Gopel for her helpful advice. We are grateful to Hervé Traineau and Bernard Sanjuan for discussions and samples from Bouillante. We thank Jacques Deparis for his help on some figures. We thank Patrick Skipwith for his English corrections. Finally, we thank anonymous reviewers and the editor for their helpful comments and criticisms. This study was supported by the IPGP/Ministry of Education ‘PPF Antilles’ program and the BRGM research division.

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Rad, S., Rivé, K. & Allègre, C.J. Weathering regime associated with subsurface circulation on volcanic islands. Aquat Geochem 17, 221–241 (2011). https://doi.org/10.1007/s10498-011-9122-7

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