Geochemistry of basalts from small eruptive centers near Villarrica stratovolcano, Chile: Evidence for lithospheric mantle components in continental arc magmas

Hickey‐Vargas, Rosemary; Sun, Murong; Holbik, Sven

doi:10.1016/j.gca.2016.03.033

Cited by 31 publications

(14 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Whereas geochemical variations in primitive arc magmas are commonly attributed to a continental component (either recycled or through crustal assimilation), the role of the mantle wedge is often overlooked. Similar mantle wedge heterogeneity recorded in arc magmas over short (<25 km) distances has also recently been observed in the Southern Volcanic Zone in Chile [ Hickey‐Vargas et al ., ] and central Italy [ Nikogosian et al ., ].…”

Section: Discussionmentioning

confidence: 99%

A distinct source and differentiation history for Kolumbo submarine volcano, Santorini volcanic field, Aegean arc

Klaver

Carey

Nomikou

et al. 2016

Geochem Geophys Geosyst

View full text Add to dashboard Cite

This study reports the first detailed geochemical characterization of Kolumbo submarine volcano in order to investigate the role of source heterogeneity in controlling geochemical variability within the Santorini volcanic field in the central Aegean arc. Kolumbo, situated 15 km to the northeast of Santorini, last erupted in 1650 AD and is thus closely associated with the Santorini volcanic system in space and time. Samples taken by remotely‐operated vehicle that were analyzed for major element, trace element and Sr‐Nd‐Hf‐Pb isotope composition include the 1650 AD and underlying K2 rhyolitic, enclave‐bearing pumices that are nearly identical in composition (73 wt.% SiO2, 4.2 wt.% K2O). Lava bodies exposed in the crater and enclaves are basalts to andesites (52–60 wt.% SiO2). Biotite and amphibole are common phenocryst phases, in contrast with the typically anhydrous mineral assemblages of Santorini. The strong geochemical signature of amphibole fractionation and the assimilation of lower crustal basement in the petrogenesis of the Kolumbo magmas indicates that Kolumbo and Santorini underwent different crustal differentiation histories and that their crustal magmatic systems are unrelated. Moreover, the Kolumbo samples are derived from a distinct, more enriched mantle source that is characterized by high Nb/Yb (>3) and low 206Pb/204Pb (<18.82) that has not been recognized in the Santorini volcanic products. The strong dissimilarity in both petrogenesis and inferred mantle sources between Kolumbo and Santorini suggests that pronounced source variations can be manifested in arc magmas that are closely associated in space and time within a single volcanic field.

show abstract

Section: Discussionmentioning

confidence: 99%

A distinct source and differentiation history for Kolumbo submarine volcano, Santorini volcanic field, Aegean arc

Klaver

Carey

Nomikou

et al. 2016

Geochem Geophys Geosyst

View full text Add to dashboard Cite

show abstract

“…The SVZ has itself been subdivided into northern (NSVZ: 33°S-34.5°S), transitional (TSVZ: 34.5°S-37°S), central (CSVZ: 37°S-41.5°S) and southern (SSVZ: 41.5°S-46°S) zones by (Lopez-Escobar & Moreno, 1994;Lopez-Escobar et al, 1995). Recently, Hickey-Vargas et al (2016b) proposed to move the northern limit of the CSVZ from 37°S to 38°S, this new limit corresponding to the northern extremitity of an important intra-arc, transpressional dextral strike-slip structure, the 1200 km-long Liquiñe-Ofqui fault zone (LOFZ) extending from 38° to 47°S (Cembrano et al, 1996), to which the SSVZ is related ( Fig. 1a).…”

Section: Picada Volcanomentioning

confidence: 99%

“…Specific volcanoes of the SVZ have also been investigated (e.g. Bouvet De Maisonneuve et al, 2013;Hickey-Vargas et al, 2016b;Higgins et al, 2015;Kratzmann et al, 2010;Lopez-Escobar et al, 1995;Lopez-Escobar et al, 1981;Reubi et al, 2011;Ruprecht et al, 2012;Ruth et al, 2016). However, despite this abundant research, few detailed petrological studies (e.g.…”

Section: Introductionmentioning

confidence: 99%

Mantle Melting and Magmatic Processes Under La Picada Stratovolcano (CSVZ, Chile)

Auwera

Namur

Dutrieux

et al. 2019

Journal of Petrology

View full text Add to dashboard Cite

Where and how arc magmas are generated and differentiated are still debated and these questions are investigated in the context of part of the Andean arc (Chilean Southern Volcanic Zone) where the continental crust is thin. Results are presented for the La Picada stratovolcano (41°S) that belongs to the Central Southern Volcanic Zone (CSVZ) (38°S–41·5°S, Chile) which results from the subduction of the Nazca plate beneath the western margin of the South American continent. Forty-seven representative samples collected from different units of the volcano define a differentiation trend from basalt to basaltic andesite and dacite (50·9 to 65·6 wt % SiO2). This trend straddles the tholeiitic and calc-alkaline fields and displays a conspicuous compositional Daly Gap between 57·0 and 62·7 wt % SiO2. Interstitial, mostly dacitic, glass pockets extend the trend to 76·0 wt % SiO2. Mineral compositions and geochemical data indicate that differentiation from the basaltic parent magmas to the dacites occurred in the upper crust (∼0·2 GPa) with no sign of an intermediate fractionation stage in the lower crust. However, we have currently no precise constraint on the depth of differentiation from the primary magmas to the basaltic parent magmas. Stalling of the basaltic parent magmas in the upper crust could have been controlled by the occurrence of a major crustal discontinuity, by vapor saturation that induced volatile exsolution resulting in an increase of melt viscosity, or by both processes acting concomitantly. The observed Daly Gap thus results from upper crustal magmatic processes. Samples from both sides of the Daly Gap show contrasting textures: basalts and basaltic andesites, found as lavas, are rich in macrocrysts, whereas dacites, only observed in crosscutting dykes, are very poor in macrocrysts. Moreover, modelling of the fractional crystallization process indicates a total fractionation of 43% to reach the most evolved basaltic andesites. The Daly Gap is thus interpreted as resulting from critical crystallinity that was reached in the basaltic andesites within the main storage region, precluding eruption of more evolved lavas. Some interstitial dacitic melt was extracted from the crystal mush and emplaced as dykes, possibly connected to small dacitic domes, now eroded away. In addition to the overall differentiation trend, the basalts to basaltic andesites display variable MgO, Cr and Ni contents at a given SiO2. Crystal accumulation and high pressure fractionation fail to predict this geochemical variability which is interpreted as resulting from variable extents of fractional crystallization. Geothermobarometry using recalculated primary magmas indicates last equilibration at about 1·3–1·5 GPa and at a temperature higher than the anhydrous peridotite solidus, pointing to a potential role of decompression melting. However, because the basalts are enriched in slab components and H2O compared to N-MORB, wet melting is highly likely.

show abstract

“…The Sr-Nd-Pb isotopic compositions of the lower continental crust from the Dabie (DB), the North China Craton (NCC), the Northern Qinling (NQ), the south margin of the North China Craton (SMNCC), Yangzi Craton (YZ) and Cathaysia Block (CB) are plotted to compare (Chen and Jahn, 1998;Liu et al, 2004;Jahn et al, 1999;Ma et al, 2000;Zhang et al, 1995;Zheng et al, 2000;Xue et al, 2005;Zhang et al, 1996;Xu et al, 1997). The subcontinental lithospheric mantle is represented by the Mesozoic basalts in eastern continental China (Zhang et al, 2002, 2003Guo et al, 2014 Smith et al, 2009;Smith et al, 2006;Ewart et al, 1977;Haase et al, 2002;Smith et al, 2010;Stem et al, 1990;Savov et al, 2005;Stern et al, 2006;Ishizuka et al, 2015;Ishizuka et al, 2011;Marske et al, 2011;Reagan et al, 2013;Tamura et al, 2014;Elliott et al, 1997;Ishizuka et al, 2014;Ishizuka et al, 2015;Yokoyama et al, 2003;Mukasa et al, 2016;Dufrane et al, 2006;Hoang and Uto, 2006;Shinjo et al, 2000;Hickey, 1998;Crawford et al, 1986;Beccaluva, 1980;Turner et al, 1997;Pearce et al, 1994;Taylor and Natland, 2013;Escrig et al, 2013;Béguelin et al, 2015;Chiaradia et al, 2014;Soager et al, 2013;…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Origin of the Jurassic-Cretaceous intraplate granitoids in Eastern China as a consequence of paleo-Pacific plate subduction

Hong

Niu

Xiao

et al. 2018

Lithos

View full text Add to dashboard Cite

The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that: • a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.

show abstract

Geochemistry of basalts from small eruptive centers near Villarrica stratovolcano, Chile: Evidence for lithospheric mantle components in continental arc magmas

Cited by 31 publications

References 61 publications

A distinct source and differentiation history for Kolumbo submarine volcano, Santorini volcanic field, Aegean arc

A distinct source and differentiation history for Kolumbo submarine volcano, Santorini volcanic field, Aegean arc

Mantle Melting and Magmatic Processes Under La Picada Stratovolcano (CSVZ, Chile)

Origin of the Jurassic-Cretaceous intraplate granitoids in Eastern China as a consequence of paleo-Pacific plate subduction

Contact Info

Product

Resources

About