Constraining the sub-arc, parental magma composition for the giant Altiplano-Puna Volcanic Complex, northern Chile

González-Maurel, Osvaldo; Deegan, Frances M.; Roux, Petrus le; Harris, Chris; Troll, Valentin R.; Godoy, Benigno

doi:10.1038/s41598-020-63454-1

Cited by 14 publications

(10 citation statements)

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“…When magma is stored in the crust prior to eruption, its original geochemical characteristics are usually modified by fractional crystallisation, crustal assimilation, and mixing with isotopically diverse melts and fluids (e.g. [15][16][17][18][19][20] ). These processes can obscure the primary mantle sources of arc volcanism 16,21 and lead to considerable uncertainty surrounding the compositions of primary arc melts that are produced in the mantle wedge due to subduction.…”

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confidence: 99%

“…Oxygen isotopes ratios ( 18 O/ 16 O reported in standard δnotation relative to Vienna Standard Mean Ocean Water, i.e., δ 18 O) are frequently employed to study magma genesis and evolution at arcs (e.g. 12,20,[22][23][24][25][26][27][28][29][30][31][32] ). Initially, our knowledge of the δ 18 O values of subduction zone lavas relied on analysis of pulverised whole-rocks or mineral separates of ca.…”

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confidence: 99%

“…Analysis of single mineral grains of up to 1.7 mm 3 sample volume (~1-2 mg) by Laser Fluorination (LF) largely circumvented these problems and saw a significant improvement in our ability to gain insight into the oxygen isotope compositions of arc systems (e.g. 20,22,23,[27][28][29][30]32 ). Limitations to this approach, however, include that mineral grains often contain inclusions or are partially altered, possessing contrasting δ 18 O values to the host mineral, which may bias the δ 18 O value of the total analysed material (e.g.…”

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Sunda arc mantle source δ18O value revealed by intracrystal isotope analysis

et al. 2021

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Magma plumbing systems underlying subduction zone volcanoes extend from the mantle through the overlying crust and facilitate protracted fractional crystallisation, assimilation, and mixing, which frequently obscures a clear view of mantle source compositions. In order to see through this crustal noise, we present intracrystal Secondary Ion Mass Spectrometry (SIMS) δ18O values in clinopyroxene from Merapi, Kelut, Batur, and Agung volcanoes in the Sunda arc, Indonesia, under which the thickness of the crust decreases from ca. 30 km at Merapi to ≤20 km at Agung. Here we show that mean clinopyroxene δ18O values decrease concomitantly with crustal thickness and that lavas from Agung possess mantle-like He-Sr-Nd-Pb isotope ratios and clinopyroxene mean equilibrium melt δ18O values of 5.7 ‰ (±0.2 1 SD) indistinguishable from the δ18O range for Mid Ocean Ridge Basalt (MORB). The oxygen isotope composition of the mantle underlying the East Sunda Arc is therefore largely unaffected by subduction-driven metasomatism and may thus represent a sediment-poor arc end-member.

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Sunda arc mantle source δ18O value revealed by intracrystal isotope analysis

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“…Enriched Sr and Nd isotopes, as shown in this study, have alternative explanations of inheriting from an enriched mantle source. Indeed, for large silicic systems including Yellowstone‐Snake River Plain volcanic province, Altiplano‐Puna volcanic complex, Cerro Galán, Taupo, and Toba volcanic systems, more compelling lines of evidence have indicated that the silicic magmas are mainly evolutionary products of mantle‐derived basaltic melts, with varying degrees of crustal assimilation (e.g., Folkes et al., 2011; González‐Maurel et al., 2020; McCulloch et al., 1994; Simon et al., 2014; Szymanowski et al., 2015 and this study).…”

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New Insights Into the Petrogenesis of Voluminous Crustal‐Signature Silicic Volcanic Rocks of the Toba Eruptions (Indonesia)

et al. 2022

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The formation of large‐volume silicic magmas in arc settings is fundamental for understanding trans‐crustal magmatic systems related to subduction zones. Here, we present an integrated study of the four Quaternary Toba eruptions and pre‐caldera Haranggaol Andesite on Sumatra, Indonesia. This rock suite has significantly enriched Sr‐Nd isotopes (87Sr/86Sr = 0.71220–0.71517, εNd = −8.9 to −10.6) compared with other volcanic rocks on Sunda‐Banda arc, but is similar to the post‐caldera (<74 ka) Sipisupisu basalts near the Toba Caldera. Thermodynamic modeling using Magma Chamber Simulator has revealed that the Toba silicic rocks can be produced by a two‐stage assimilation and fractional crystallization of mantle‐derived basaltic melts with compositions similar to the Sipisupisu basalts in the lower and upper crustal magma reservoirs. Binary modeling of Sr‐Nd isotopes suggests that the rocks near the Toba Caldera can be produced by mixing of 5%–10% of the subducting Nicobar Fan sediments (87Sr/86Sr = 0.73493, εNd = −14 on average) with depleted MORB mantle (DMM). Indeed, decompressional partial melting modeling of bulk mixtures of DMM with 7% subducting sediments using pMELTS indicates that the melts generated can have geochemical compositions similar to the Sipisupisu basalts. We therefore argue that hybridization of the subducting sediments with the mantle wedge could be an alternative scenario responsible for the enriched isotopic characteristics of the rocks near Toba. Prolonged fractionation of mantle‐derived enriched/depleted basaltic melts, accompanied by crustal assimilation and crystal‐melt segregation, could be common processes in generating large‐volume silicic magmas on continental arcs.

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“…In turn, earthquakes are closely associated with tectonic activity and zones of plate subduction. Magma evolution and assimilation at the subduction zones of the Andes significantly affected the geologic setting in South America in the past [103,104]. The earthquakes usually have negative consequences and involve such hazardous events as landslides, rockfalls, and ground shaking.…”

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Handling Dataset with Geophysical and Geological Variables on the Bolivian Andes by the GMT Scripts

Lemenkova

2022

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In this paper, an integrated mapping of the georeferenced data is presented using the QGIS and GMT scripting tool set. The study area encompasses the Bolivian Andes, South America, notable for complex geophysical and geological parameters and high seismicity. A data integration was performed for a detailed analysis of the geophysical and geological setting. The data included the raster and vector datasets captured from the open sources: the IRIS seismic data (2015 to 2021), geophysical data from satellite-derived gravity grids based on CryoSat, topographic GEBCO data, geoid undulation data from EGM-2008, and geological georeferences’ vector data from the USGS. The techniques of data processing included quantitative and qualitative evaluation of the seismicity and geophysical setting in Bolivia. The result includes a series of thematic maps on the Bolivian Andes. Based on the data analysis, the western region was identified as the most seismically endangered area in Bolivia with a high risk of earthquake hazards in Cordillera Occidental, followed by Altiplano and Cordillera Real. The earthquake magnitude here ranges from 1.8 to 7.6. The data analysis shows a tight correlation between the gravity, geophysics, and topography in the Bolivian Andes. The cartographic scripts used for processing data in GMT are available in the author’s public GitHub repository in open-access with the provided link. The utility of scripting cartographic techniques for geophysical and topographic data processing combined with GIS spatial evaluation of the geological data supported automated mapping, which has applicability for risk assessment and geological hazard mapping of the Bolivian Andes, South America.

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Constraining the sub-arc, parental magma composition for the giant Altiplano-Puna Volcanic Complex, northern Chile

Cited by 14 publications

References 32 publications

Sunda arc mantle source δ18O value revealed by intracrystal isotope analysis

Sunda arc mantle source δ18O value revealed by intracrystal isotope analysis

New Insights Into the Petrogenesis of Voluminous Crustal‐Signature Silicic Volcanic Rocks of the Toba Eruptions (Indonesia)

Handling Dataset with Geophysical and Geological Variables on the Bolivian Andes by the GMT Scripts

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