Geological evolution of Paniri volcano, Central Andes, northern Chile

Godoy, Benigno; Lazcano, José; Rodríguez, Inés; Martínez, Paula; Parada, Miguel A.; Roux, Petrus le; Wilke, Hans-Gerhard; Polanco, Edmundo

doi:10.1016/j.jsames.2018.03.013

Cited by 14 publications

(18 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The crystallization depth obtained according to thermobarometry studies is 7–20 km (Godoy et al, ), which is consistent with the spatial location of C2 anomaly (top, 5 km; base, 13 km; Figure ). Future geophysical and geological studies could help to estimate the melt percentage associated with these magmatic bodies, since converting geophysical observables to estimates of the amount of partial melt requires assumptions about the nature of crustal anisotropy (Ward et al, ), the distribution of melt at the grain scale (i.e., dihedral angle; see Forsyth ()) and in veins, dikes, and sills too small to be resolved by geophysical inversion (Unsworth & Rondenay, ).…”

Section: Discussionsupporting

confidence: 83%

“…Comparison between depths of possible partial melting zone according to thermobarometry (blue; De Silva et al, ; Godoy et al, ) and results obtained by magnetotellurics (red).…”

Section: Discussionmentioning

confidence: 99%

“…Considering its location, another possible interpretation is related to partial melting of the magmatic products of Paniri volcano. The expected resistivity values for a complete melting of the rocks according to the volcanic composition of the newest products of Paniri volcano (Godoy et al, ) would be of the order of 2.2–3.1 Ωm (using Sigmelts; Pommier and Le Trong ()). Partial melting, on the other hand, would result in an increase of resistivity, consistent with the inversion results of 6–13 Ωm.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2019

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionsupporting

confidence: 83%

“…Comparison between depths of possible partial melting zone according to thermobarometry (blue; De Silva et al, ; Godoy et al, ) and results obtained by magnetotellurics (red).…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Paniri (22°03′S; 68°14′W) is a stratovolcano constructed during four separate stages between 1.4 Ma to 100 ka, whose most primitive activity is represented by isolated basaltic-andesite to andesite lava flows erupted at ca. 400 kyr ago 23 . La Poruñita (21°17′S; 68°15′W), situated in the northernmost part of the projected APMB, is a scoria cone ca.…”

mentioning

confidence: 99%

“…Olivine-and pyroxene-phyric lava and scoria are ubiquitous at La Poruña, San Pedro, Paniri, La Poruñita, Palpana and Chela and vary from basaltic-andesite to andesite in composition, with whole-rock elemental and Sr and Nd isotope compositions that range from e.g., SiO 2 = 54.6 to 62.9 wt%, MgO = 1.6 to 6.1 wt%, Sr = 389 to 885 ppm, Cr = 5 to 625 ppm, 87 Sr/ 86 Sr = 0.705541(10) to 0.707656 (10), and 143 Nd/ 144 Nd = 0.512337(12) to 0.512513(50) (see 12,22,23 ). Recent work on these volcanoes utilised whole-rock elemental and Sr and Nd isotope data to construct an evolutionary model, in which limited magmatic differentiation occurred at mid-upper crustal levels 12,22 .…”

mentioning

confidence: 99%

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Soils in ancient irrigated agricultural terraces in the Atacama Desert, Chile

et al. 2021

View full text Add to dashboard Cite

The Atacama Desert is among the driest places on Earth, yet ancient agricultural systems are present in the region. Here, we present a study of terraced agricultural soils in the high‐altitude eastern margin of the Atacama Desert in northern Chile, mainly dating to the Late Intermediate Period (ca. 950–1400 AD) and Inka period (ca. 1400–1536 AD). Terraced fields were compartmentalized to distribute limited irrigation water originating mainly from springs. Natural soils used for agriculture are mostly Aridisols developed on Pleistocene alluvial fan terraces and hillslopes underlain by volcanic bedrock. One research objective is to evaluate long‐term soil change from agriculture. In this hyperarid climate, agriculture is only possible with irrigation, so natural soils on the same geomorphic surface adjacent to irrigated soils provide baseline data for assessing anthropogenic soil change. Data from soil profiles and surface transects indicate intentional soil change through terracing, removal of soil rock fragments, and probable fertilization. Agricultural soils have anthropogenic horizons ranging from 16 to 54 cm thick. Most agricultural soils have higher phosphorus levels, suggesting enrichment from fertilization. Changes in soil organic carbon and nitrogen are also evident. Unintentional anthropogenic soil change resulted from CaCO3 input through irrigation with calcareous spring water. Initial studies suggest that agriculture here was sustainable in the sense of conserving soils, and maintaining and possibly improving soil productivity over centuries.

show abstract

Geological evolution of Paniri volcano, Central Andes, northern Chile

Cited by 14 publications

References 60 publications

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

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

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

Soils in ancient irrigated agricultural terraces in the Atacama Desert, Chile

Contact Info

Product

Resources

About