Sr- and Nd- isotope variations along the Pleistocene San Pedro – Linzor volcanic chain, N. Chile: Tracking the influence of the upper crustal Altiplano-Puna Magma Body

Godoy, Benigno; Roux, Petrus le; Silva, De; Parada, Miguel A.; Kojima, Shoji; González-Maurel, Osvaldo; Morata, Diego; Polanco, Edmundo; Martínez, Paula

doi:10.1016/j.jvolgeores.2017.05.030

Cited by 28 publications

(16 citation statements)

References 74 publications

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“…This estimated degree of assimilation agrees well with the estimates based on radiogenic isotope and trace element modelling using data from the same samples, which require about 12 to 28% assimilation (see Supplementary Information), in broad agreement with recent findings for the studied volcanoes (cf. ~13% to 23% 20 ). Binary mixing modelling shows that our data are best explained by interaction between primitive mantle-derived melt and continental crust with high 87 Sr/ 86 Sr ratios (>0.714) and δ 18 O values of 11.8‰ to 19.5‰ (Fig.…”

Section: Scientific Reports |mentioning

confidence: 99%

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

González-Maurel

Deegan

Roux

et al. 2020

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The Andean continental arc is built upon the thickest crust on Earth, whose eruption products reflect varying degrees of crustal assimilation. In order to robustly model magma evolution and assimilation at subduction zones such as the Andes, the compositions of parental magmas feeding crustal magma reservoirs need to be defined. Here we present new olivine and clinopyroxene oxygen isotope data from rare mafic volcanic rocks erupted at the margins of the giant Altiplano-Puna Magma Body (APMB) of the Altiplano-Puna Volcanic Complex, Central Andes. Existing olivine and pyroxene δ18O values for the Central Andes are highly variable and potentially not representative of sub-arc parental compositions. However, new olivine (n = 6) and clinopyroxene (n = 12) δ18O values of six Central Andean volcanoes presented here display a narrow range, with averages at 6.0‰ ± 0.2 (2σ S.D.) and 6.7‰ ± 0.3 (2σ S.D.), consistent with a common history for the investigated minerals. These data allow us to estimate the δ18O values of sub-arc, parental melts to ca. 7.0‰ ± 0.2 (2σ S.D.). Parental melts feeding the APMB and associated volcanic centres are postulated to form in the felsic continental crust following assimilation of up to 28% high-δ18O basement rocks by mantle-derived magmas.

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Section: Scientific Reports |mentioning

confidence: 99%

“…1). In this region, the ascending parental basaltic-andesite magma is thought to have avoided significant contamination by evolved melts from the APMB as demonstrated by the lowest 87 Sr/ 86 Sr and highest 143 Nd/ 144 Nd being towards the borders of the large felsic body 12,20 . The studied volcanoes ( Fig.…”

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confidence: 98%

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

González-Maurel

Deegan

Roux

et al. 2020

Sci Rep

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“…Located in the CVZ, the San Pedro‐Linzor volcanic chain (Figure ) consists of seven volcanoes with activity since the Miocene (Godoy et al, ; Sellés & Gardeweg, ): San Pedro, San Pablo, Paniri, Lavas de Chao, Cerro de Leon, Toconce, and Linzor. The San Pedro‐Linzor volcanic chain presents a variable composition of its eruptive products, through different stages of its evolution.…”

Section: Introductionmentioning

confidence: 99%

“…The San Pedro‐Linzor volcanic chain presents a variable composition of its eruptive products, through different stages of its evolution. Geologically, the composition of the volcanoes San Pedro, San Pablo, Paniri, Toconce, and Cerro de Leon is very similar, constituted mainly of two‐pyroxene andesites (Godoy et al, ; Marinovic & Lahsen, ; Ramírez & Huete, ; Sellés & Gardeweg, ). Cerro Chao is a different case, with a horblende dacite and biotite composition, and it is the largest silic lava dome in the world (De Silva et al, ) .…”

Section: Introductionmentioning

confidence: 99%

“…Cerro Chao is a different case, with a horblende dacite and biotite composition, and it is the largest silic lava dome in the world (De Silva et al, ) . The San Pedro‐Linzor volcanic chain has an NW‐SE orientation, which differs from the N‐S orientation of the Central Andean volcanic arc in this zone (Godoy et al, ). None of the volcanoes shows historical activity except San Pedro, where the last eruption dates back to 1960 (Francis et al, ) and is considered one of the most active volcanoes in the world (O'Callaghan & Francis, ).…”

Section: Introductionmentioning

confidence: 99%

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Conductivity Distribution Beneath the San Pedro‐Linzor Volcanic Chain, North Chile, Using 3‐D Magnetotelluric Modeling

et al. 2019

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A magnetotelluric study was carried out in the San Pedro-Linzor volcanic chain, North Chile, to identify possible magmatic structures and hydrothermal systems associated with volcanoes of Holocene activity, considering previous petrochemical studies pointing to crystallization depths of approximately 8 km. Three-dimensional resistivity models based on magnetotellurics data of the San Pedro-Linzor volcanic chain were obtained based on broadband data measured in 2017 and 2018, in addition to long-period data measured in 1990s. The three-dimensional modeling shows two low-resistivity zones (less than 10 m) interpreted as partially molten areas below the Chao Dome and the Paniri volcano, and a shallower low resistivity area (less than 5 m) in the Turi Basin, an active hydrothermal system to the southwest of the volcanic chain.

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The geological evolution of the Silala River basin, Central Andes

Blanco,

Polanco

2023

WIREs Water

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Improved understanding of the geology and stratigraphic architecture of the Silala River basin and its evolution, reviewed here, has been important in providing scientific evidence to an international dispute between Chile and Bolivia on the nature and origin of the waters of the Silala River. The dispute was submitted in 2016 to International Court of Justice (ICJ), which issued its judgment in 2022. The Silala River has evolved within an active volcanic chain, in the western region of the Andean plateau. Various volcanic structures, at different stages of their evolution, have determined the basin's development. The first evidence of alluvial drainage associated with the Silala fluvial system appeared in the Lower Pleistocene (ca. 2.6–1.6 Ma), a record of alluvial deposits with paleoflow directions toward the Southwest and South‐Southwest. These deposits had an important role in forming a highly permeable horizon, confined between two pyroclastic deposits (the Cabana and Silala Ignimbrites) which comprise the main regional aquifer in the basin, although there are other minor locally important aquifers. The second stage in the evolution of the river system occurred in the late Upper Pleistocene‐Lower Holocene (ca. 11–8.5 ka BP), when an erosive period carved the current trans‐boundary ravine in the Silala Ignimbrite. Morphological evidence clearly shows that the ravine was carved by fluvial action. The only documented tectonic activity during the development of the Silala River basin is the Cabana reverse fault and associated normal faults, representing an East–West shortening, which occurred between 2.6 and 1.6 Ma.This article is categorized under: Science of Water > Water and Environmental Change Science of Water > Hydrological Processes Water and Life > Nature of Freshwater Ecosystems Human Water > Water Governance

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Sr- and Nd- isotope variations along the Pleistocene San Pedro – Linzor volcanic chain, N. Chile: Tracking the influence of the upper crustal Altiplano-Puna Magma Body

Cited by 28 publications

References 74 publications

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

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

Conductivity Distribution Beneath the San Pedro‐Linzor Volcanic Chain, North Chile, Using 3‐D Magnetotelluric Modeling

The geological evolution of the Silala River basin, Central Andes

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