The temporal evolution of back-arc magmas from the Auca Mahuida shield volcano (Payenia Volcanic Province, Argentina)
In order to better constrain the temporal volcanic activity of the back-arc context in Payenia Volcanic Province (PVP, Argentina), we present new K-Ar dating, petrographic data, major and trace elements from 23 samples collected on the Auca Mahuida shield volcano. Our new data, coupled with publishe...
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todo:paper_03770273_v323_n_p19_Pallares2023-10-03T15:31:23Z The temporal evolution of back-arc magmas from the Auca Mahuida shield volcano (Payenia Volcanic Province, Argentina) Pallares, C. Quidelleur, X. Gillot, P.-Y. Kluska, J.-M. Tchilinguirian, P. Sarda, P. Argentina Auca Mahuida volcano K-Ar ages Los Volcanes OIB-type magmas Payenia Volcanic Province Basalt Igneous rocks Magnesia Trace elements Argentina Los Volcanes Major and trace elements OIB-type magmas Payenia Volcanic Province Subducting plate Temporal evolution Volcanic activities Volcanoes backarc basin mantle source ocean island basalt partial melting petrography temporal evolution trace element Argentina Auca Mahuida Reserve Neuquen Payenia Volcanic Province In order to better constrain the temporal volcanic activity of the back-arc context in Payenia Volcanic Province (PVP, Argentina), we present new K-Ar dating, petrographic data, major and trace elements from 23 samples collected on the Auca Mahuida shield volcano. Our new data, coupled with published data, show that this volcano was built from about 1.8 to 1.0 Ma during five volcanic phases, and that Auca Mahuida magmas were extracted from, at least, two slightly different OIB-type mantle sources with a low partial melting rate. The first one, containing more garnet, was located deeper in the mantle, while the second contains more spinel and was thus shallower. The high-MgO basalts (or primitive basalts) and the low-MgO basalts (or evolved basalts), produced from the deeper and shallower lherzolite mantle sources, respectively, are found within each volcanic phase, suggesting that both magmatic reservoirs were sampled during the 1 Myr lifetime of the Auca Mahuida volcano. However, a slight increase of the proportion of low-MgO basalts, as well as of magmas sampled from the shallowest source, can be observed through time. Similar overall petrological characteristics found in the Pleistocene-Holocene basaltic rocks from Los Volcanes and Auca Mahuida volcano suggest that they originated from the same magmatic source. Consequently, it can be proposed that the thermal asthenospheric anomaly is probably still present beneath the PVP. Finally, our data further support the hypothesis that the injection of hot asthenosphere with an OIB mantle source signature, which was triggered by the steepening of the Nazca subducting plate, induced the production of a large volume of lavas within the PVP since 2 Ma. © 2016 Elsevier B.V. Fil:Tchilinguirian, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03770273_v323_n_p19_Pallares |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Argentina Auca Mahuida volcano K-Ar ages Los Volcanes OIB-type magmas Payenia Volcanic Province Basalt Igneous rocks Magnesia Trace elements Argentina Los Volcanes Major and trace elements OIB-type magmas Payenia Volcanic Province Subducting plate Temporal evolution Volcanic activities Volcanoes backarc basin mantle source ocean island basalt partial melting petrography temporal evolution trace element Argentina Auca Mahuida Reserve Neuquen Payenia Volcanic Province |
| spellingShingle |
Argentina Auca Mahuida volcano K-Ar ages Los Volcanes OIB-type magmas Payenia Volcanic Province Basalt Igneous rocks Magnesia Trace elements Argentina Los Volcanes Major and trace elements OIB-type magmas Payenia Volcanic Province Subducting plate Temporal evolution Volcanic activities Volcanoes backarc basin mantle source ocean island basalt partial melting petrography temporal evolution trace element Argentina Auca Mahuida Reserve Neuquen Payenia Volcanic Province Pallares, C. Quidelleur, X. Gillot, P.-Y. Kluska, J.-M. Tchilinguirian, P. Sarda, P. The temporal evolution of back-arc magmas from the Auca Mahuida shield volcano (Payenia Volcanic Province, Argentina) |
| topic_facet |
Argentina Auca Mahuida volcano K-Ar ages Los Volcanes OIB-type magmas Payenia Volcanic Province Basalt Igneous rocks Magnesia Trace elements Argentina Los Volcanes Major and trace elements OIB-type magmas Payenia Volcanic Province Subducting plate Temporal evolution Volcanic activities Volcanoes backarc basin mantle source ocean island basalt partial melting petrography temporal evolution trace element Argentina Auca Mahuida Reserve Neuquen Payenia Volcanic Province |
| description |
In order to better constrain the temporal volcanic activity of the back-arc context in Payenia Volcanic Province (PVP, Argentina), we present new K-Ar dating, petrographic data, major and trace elements from 23 samples collected on the Auca Mahuida shield volcano. Our new data, coupled with published data, show that this volcano was built from about 1.8 to 1.0 Ma during five volcanic phases, and that Auca Mahuida magmas were extracted from, at least, two slightly different OIB-type mantle sources with a low partial melting rate. The first one, containing more garnet, was located deeper in the mantle, while the second contains more spinel and was thus shallower. The high-MgO basalts (or primitive basalts) and the low-MgO basalts (or evolved basalts), produced from the deeper and shallower lherzolite mantle sources, respectively, are found within each volcanic phase, suggesting that both magmatic reservoirs were sampled during the 1 Myr lifetime of the Auca Mahuida volcano. However, a slight increase of the proportion of low-MgO basalts, as well as of magmas sampled from the shallowest source, can be observed through time. Similar overall petrological characteristics found in the Pleistocene-Holocene basaltic rocks from Los Volcanes and Auca Mahuida volcano suggest that they originated from the same magmatic source. Consequently, it can be proposed that the thermal asthenospheric anomaly is probably still present beneath the PVP. Finally, our data further support the hypothesis that the injection of hot asthenosphere with an OIB mantle source signature, which was triggered by the steepening of the Nazca subducting plate, induced the production of a large volume of lavas within the PVP since 2 Ma. © 2016 Elsevier B.V. |
| format |
JOUR |
| author |
Pallares, C. Quidelleur, X. Gillot, P.-Y. Kluska, J.-M. Tchilinguirian, P. Sarda, P. |
| author_facet |
Pallares, C. Quidelleur, X. Gillot, P.-Y. Kluska, J.-M. Tchilinguirian, P. Sarda, P. |
| author_sort |
Pallares, C. |
| title |
The temporal evolution of back-arc magmas from the Auca Mahuida shield volcano (Payenia Volcanic Province, Argentina) |
| title_short |
The temporal evolution of back-arc magmas from the Auca Mahuida shield volcano (Payenia Volcanic Province, Argentina) |
| title_full |
The temporal evolution of back-arc magmas from the Auca Mahuida shield volcano (Payenia Volcanic Province, Argentina) |
| title_fullStr |
The temporal evolution of back-arc magmas from the Auca Mahuida shield volcano (Payenia Volcanic Province, Argentina) |
| title_full_unstemmed |
The temporal evolution of back-arc magmas from the Auca Mahuida shield volcano (Payenia Volcanic Province, Argentina) |
| title_sort |
temporal evolution of back-arc magmas from the auca mahuida shield volcano (payenia volcanic province, argentina) |
| url |
http://hdl.handle.net/20.500.12110/paper_03770273_v323_n_p19_Pallares |
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