<sup>3</sup>He/<sup>4</sup>He Signature of Magmatic Fluids from Telica (Nicaragua) and Baru (Panama) Volcanoes, Central American Volcanic Arc
Constraining the magmatic <sup>3</sup>He/<sup>4</sup>He signature of fluids degassed from a magmatic system is crucial for making inferences on its mantle source. This is especially important in arc volcanism, where variations in the composition of the wedge potentially induc...
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MDPI AG
2022-04-01
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| Online Access: | https://www.mdpi.com/2076-3417/12/9/4241 |
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| author | Andrea L. Rizzo Philippe Robidoux Alessandro Aiuppa Andrea Di Piazza |
| author_facet | Andrea L. Rizzo Philippe Robidoux Alessandro Aiuppa Andrea Di Piazza |
| author_sort | Andrea L. Rizzo |
| collection | DOAJ |
| description | Constraining the magmatic <sup>3</sup>He/<sup>4</sup>He signature of fluids degassed from a magmatic system is crucial for making inferences on its mantle source. This is especially important in arc volcanism, where variations in the composition of the wedge potentially induced by slab sediment fluids must be distinguished from the effects of magma differentiation, degassing, and crustal contamination. The study of fluid inclusions (FIs) trapped in minerals of volcanic rocks is becoming an increasingly used methodology in geochemical studies that integrates the classical study of volcanic and geothermal fluids. Here, we report on the first noble gas (He, Ne, Ar) concentrations and isotopic ratios of FI in olivine (Ol) and pyroxene (Px) crystals separated from eruptive products of the Telica and Baru volcanoes, belonging to the Nicaraguan and Panamanian arc-segments of Central America Volcanic arc (CAVA). FIs from Telica yield air corrected <sup>3</sup>He/<sup>4</sup>He (Rc/Ra) of 7.2–7.4 Ra in Ol and 6.1–7.3 in Px, while those from Baru give 7.1–8.0 Ra in Ol and 4.2–5.8 Ra in Px. After a data quality check and a comparison with previous <sup>3</sup>He/<sup>4</sup>He measurements carried out on the same volcanoes and along CAVA, we constrained a magmatic Rc/Ra signature of 7.5 Ra for Telica and of 8.0 Ra for Baru, both within the MORB range (8 ± 1 Ra). These <sup>3</sup>He/<sup>4</sup>He differences also reflect variations in the respective arc-segments, which cannot be explained by radiogenic <sup>4</sup>He addition due to variable crust thickness, as the mantle beneath Nicaragua and Panama is at about 35 and 30 km, respectively. We instead highlight that the lowest <sup>3</sup>He/<sup>4</sup>He signature observed in the Nicaraguan arc segment reflects a contamination of the underlying wedge by slab sediment fluids. Rc/Ra values up to 9.0 Ra are found at Pacaya volcano in Guatemala, where the crust is 45 km thick, while a <sup>3</sup>He/<sup>4</sup>He signature of about 8.0 Ra was measured at Turrialba volcano in Costa Rica, which is similar to that of Baru, and reflects possible influence of slab melting, triggered by a change in subduction conditions and the contemporary subduction of the Galapagos hot-spot track below southern Costa Rica and western Panama. |
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| spelling | doaj.art-f8e443f07f4847d2aabff3edf98c6d072023-11-23T07:46:16ZengMDPI AGApplied Sciences2076-34172022-04-01129424110.3390/app12094241<sup>3</sup>He/<sup>4</sup>He Signature of Magmatic Fluids from Telica (Nicaragua) and Baru (Panama) Volcanoes, Central American Volcanic ArcAndrea L. Rizzo0Philippe Robidoux1Alessandro Aiuppa2Andrea Di Piazza3Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Milano, Via Alfonso Corti 12, 20133 Milano, ItalyCentro de Excelencia en Geotermia de los Andes (CEGA) y Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago 8370450, ChileDipartimento DiSTeM, Università di Palermo, Via Archirafi 36, 90123 Palermo, ItalyIstituto Nazionale di Geofisica e Vulcanologia, Sezione di Roma1, Via di Vigna Murata 605, 00143 Roma, ItalyConstraining the magmatic <sup>3</sup>He/<sup>4</sup>He signature of fluids degassed from a magmatic system is crucial for making inferences on its mantle source. This is especially important in arc volcanism, where variations in the composition of the wedge potentially induced by slab sediment fluids must be distinguished from the effects of magma differentiation, degassing, and crustal contamination. The study of fluid inclusions (FIs) trapped in minerals of volcanic rocks is becoming an increasingly used methodology in geochemical studies that integrates the classical study of volcanic and geothermal fluids. Here, we report on the first noble gas (He, Ne, Ar) concentrations and isotopic ratios of FI in olivine (Ol) and pyroxene (Px) crystals separated from eruptive products of the Telica and Baru volcanoes, belonging to the Nicaraguan and Panamanian arc-segments of Central America Volcanic arc (CAVA). FIs from Telica yield air corrected <sup>3</sup>He/<sup>4</sup>He (Rc/Ra) of 7.2–7.4 Ra in Ol and 6.1–7.3 in Px, while those from Baru give 7.1–8.0 Ra in Ol and 4.2–5.8 Ra in Px. After a data quality check and a comparison with previous <sup>3</sup>He/<sup>4</sup>He measurements carried out on the same volcanoes and along CAVA, we constrained a magmatic Rc/Ra signature of 7.5 Ra for Telica and of 8.0 Ra for Baru, both within the MORB range (8 ± 1 Ra). These <sup>3</sup>He/<sup>4</sup>He differences also reflect variations in the respective arc-segments, which cannot be explained by radiogenic <sup>4</sup>He addition due to variable crust thickness, as the mantle beneath Nicaragua and Panama is at about 35 and 30 km, respectively. We instead highlight that the lowest <sup>3</sup>He/<sup>4</sup>He signature observed in the Nicaraguan arc segment reflects a contamination of the underlying wedge by slab sediment fluids. Rc/Ra values up to 9.0 Ra are found at Pacaya volcano in Guatemala, where the crust is 45 km thick, while a <sup>3</sup>He/<sup>4</sup>He signature of about 8.0 Ra was measured at Turrialba volcano in Costa Rica, which is similar to that of Baru, and reflects possible influence of slab melting, triggered by a change in subduction conditions and the contemporary subduction of the Galapagos hot-spot track below southern Costa Rica and western Panama.https://www.mdpi.com/2076-3417/12/9/4241Telica volcanoBaru volcano<sup>3</sup>He/<sup>4</sup>Hefluid inclusionsCAVAslab fluids |
| spellingShingle | Andrea L. Rizzo Philippe Robidoux Alessandro Aiuppa Andrea Di Piazza <sup>3</sup>He/<sup>4</sup>He Signature of Magmatic Fluids from Telica (Nicaragua) and Baru (Panama) Volcanoes, Central American Volcanic Arc Applied Sciences Telica volcano Baru volcano <sup>3</sup>He/<sup>4</sup>He fluid inclusions CAVA slab fluids |
| title | <sup>3</sup>He/<sup>4</sup>He Signature of Magmatic Fluids from Telica (Nicaragua) and Baru (Panama) Volcanoes, Central American Volcanic Arc |
| title_full | <sup>3</sup>He/<sup>4</sup>He Signature of Magmatic Fluids from Telica (Nicaragua) and Baru (Panama) Volcanoes, Central American Volcanic Arc |
| title_fullStr | <sup>3</sup>He/<sup>4</sup>He Signature of Magmatic Fluids from Telica (Nicaragua) and Baru (Panama) Volcanoes, Central American Volcanic Arc |
| title_full_unstemmed | <sup>3</sup>He/<sup>4</sup>He Signature of Magmatic Fluids from Telica (Nicaragua) and Baru (Panama) Volcanoes, Central American Volcanic Arc |
| title_short | <sup>3</sup>He/<sup>4</sup>He Signature of Magmatic Fluids from Telica (Nicaragua) and Baru (Panama) Volcanoes, Central American Volcanic Arc |
| title_sort | sup 3 sup he sup 4 sup he signature of magmatic fluids from telica nicaragua and baru panama volcanoes central american volcanic arc |
| topic | Telica volcano Baru volcano <sup>3</sup>He/<sup>4</sup>He fluid inclusions CAVA slab fluids |
| url | https://www.mdpi.com/2076-3417/12/9/4241 |
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