Stable isotope variations in arc lavas
Subduction zones are unique tectonic setting in our solar system that facilitate crustal recycling and play a key role in the generation of continental crust, element transport and volatile cycling. The geochemistry of arc lavas produced at subduction zones has long been used to untangle the complex...
| Autores: | , |
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| Tipo de recurso: | otro |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/404792 |
| Acceso en línea: | http://hdl.handle.net/10261/404792 https://doi.org/10.1016/B978-0-323-99762-1.00118-2 |
| Access Level: | acceso abierto |
| Palabra clave: | Arc magma Co-ordination Degassing Dehydration Fractional crystallization Fractionation factor Mantle heterogeneity Oxygen fugacity Partial melting Phengite Residual slab Rutile Sediment recycling Serpentine Slab fluids Stable isotope Subduction Volatile cycling |
| Sumario: | Subduction zones are unique tectonic setting in our solar system that facilitate crustal recycling and play a key role in the generation of continental crust, element transport and volatile cycling. The geochemistry of arc lavas produced at subduction zones has long been used to untangle the complex interplay of processes on both local and global scales. The past few decades have witnessed an explosion in the exploitation of stable isotope ratios to investigate arc lavas, enabled by step changes in analytical capabilities. This chapter reviews the rapidly evolving field of stable isotope geochemistry as applied to arc lavas. The entire periodic table is analytically accessible, however, there is great disparity in our understanding of individual isotope systems in arcs. Some have been explored for decades (e.g., B), some have sufficient data to test hypotheses (e.g., Fe, Tl, Mo) and some remain unexplored (e.g., Ni, Cr). The emerging picture is one of greater isotopic variability of many, but not all, primitive arc lavas compared to mid-ocean ridge basalts. When present, variations allow quantification of arc lava ‘ingredients,’ alongside understanding dynamic processes such as serpentinization, fluid fluxes and compositions, evolving redox conditions, and the control of accessory phases. Combining advances in stable isotope geochemistry with multi-disciplinary information from geophysics, tectonics, petrology will allow exciting breakthroughs in identifying and quantifying processes taking place at the most critical locations for mass transfer on our planet. |
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