The Cerro Galan ignimbrite

Francis, P. W.; O'Callaghan, L.; Kretzschmar, G.A.; Thorpe, R. S.; Sparks, R. S. J.; Page, R. N.; Barrio, Raúl E. de; Gillou, G.; González, Orlando

doi:10.1038/301051a0

Cited by 44 publications

(25 citation statements)

References 52 publications

(47 reference statements)

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“…The new ages largely agree with those published by Francis et al (1983) and Sparks et al (1985) but there are some differences. This is most likely due to the wider range of analyzed material used by these previous authors, such as combined juvenile clast and matrix material analyses of biotite, plagioclase and glass (Table 1).…”

Section: Revision Of the Cerro Galán Stratigraphysupporting

confidence: 82%

“…We did not revisit all of the Sparks et al (1985) localities, but covered a broader geographic area to understand the geographic distribution of deposits. Francis et al 1983;Sparks et al 1985) Rock type or ignimbrite on K-content). Incremental heating plateau ages and argonisotope isochron ages were calculated as a weighted mean with 1/σ 2 as the weighting factor (Taylor 1997) and a YORK2 least squares fit with correlated errors (York 1969) using the ArArCALC v2.2 software (Koppers 2002;Fig.…”

Section: Methodsmentioning

confidence: 98%

“…Various pre-caldera and post-caldera small-volume lava domes were also identified within the modern caldera. The most recent and extensive Cerro Galán Ignimbrite (CGI) was first examined by Francis et al (1983), who characterized the ignimbrite as a crystal-rich but pumice and lithic-poor pyroclastic flow deposit comprising one massive flow unit, up to 120 m thick. A more detailed investigation of the Galán stratigraphy was performed by Sparks et al (1985), who described an older sequence of ignimbrites.…”

Section: Cerro Galán Caldera-previous Workmentioning

confidence: 99%

“…No super-eruptions have been witnessed in human history and little is known about their frequency, eruption mechanisms or the emplacement processes of erupted material. Previous work has shown that at least one VEI 8 eruption occurred at Cerro Galán since 2.5 Ma (Francis et al 1983). In addition, a sequence of large volume pyroclastic eruptions preceded this cataclysmic eruption (Sparks et al 1985).…”

Section: Introductionmentioning

confidence: 96%

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A re-appraisal of the stratigraphy and volcanology of the Cerro Galán volcanic system, NW Argentina

et al. 2011

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Section: Revision Of the Cerro Galán Stratigraphysupporting

confidence: 82%

Section: Methodsmentioning

confidence: 98%

Section: Cerro Galán Caldera-previous Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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A re-appraisal of the stratigraphy and volcanology of the Cerro Galán volcanic system, NW Argentina

et al. 2011

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“…이 전 이는 칼데라 함몰과 같은 새로운 화구의 개시를 나타 내는 화산사건을 의미할 수도 있고 (Druitt and Sparks, 1985), 화구 반경이 거의 동시에 넓어진다는 것을 시사할 수도 있다. 그러나 모든 화쇄류형성 분 출은 반드시 초기 플리니언 분출을 가지는 것은 아니 다 (Francis et al, 1983 113 Ma를 보여준다 상부 층상응회암층의 상부층(uUT) 이 암층 단위는 향로봉 단면에서 27 m 두께이고 괴상 응회각력암, 불량층리 라필리응회암, 괴상 라필 리응회암과 괴상 세립질 응회암으로 구성된다 (Fig. 3).…”

Section: 서 언unclassified

Eruption Styles and Processes of the Dongmakgol Tuff, Cheolwon Basin, Korea

황상구¹,

손영우²,

최장오³

et al. 2013

The Journal of the Petrological Society of Korea

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The Dongmakgol Tuff is divided into 8 lithofacies based on their grain size and depositional structures: massive tuff breccia(TBm), welded tuff and lapilli tuff(LTw), rheomorphic tuff and lapilli tuff(LTr), massive lapilli tuff(LTm), stratified lapilli tuff(LTs), gradedly bedded lapilli tuff(LTg), crudely bedded lapilli tuff(LTb) and massive fine tuff(Tm). They can be divided into 3 pyroclastic rock group based on their constituents of the lithofacies. The lower group(LI) is composed of LTm, LTw and LTr, which are interpreted to have resulted from emplacement of voluminous pyroclastic flows due to ignimbrite-form eruption to boiling-over eruption. The middle group(LT+MI) consists of LTs, LTg and LTm associated with Tm in the lower part, and of LTm, LTw and LTr in the middle and upper parts; these suggest that started with deposition of pyroclastic surges from phreatoplinian eruption by poor eternal water, passed through emplacement of pyroclastic flows from ignimbrite-form eruption and ended with deposition of voluminous pyroclastic flows from boiling-over eruption. The upper group(lUT+uUT+UI) is composed of LTs, LTg and Tm in the lowermost, TBm, LTb, LTb and Tm in the lower part, and LTm and LTw in the middle and upper part, suggesting that began with deposition of surges from phreatoplinian

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Persistent uplift of the Lazufre volcanic complex (Central Andes): New insights from PCAIM inversion of InSAR time series and GPS data

Rémy

Froger

Perfettini

et al. 2014

Geochem. Geophys. Geosyst.

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We reanalyzed the surface displacements observed at the Lazufre volcanic complex in the Southern Andean Central Volcanic Zone using GPS measurements made between 2006 and 2008 and a large InSAR data set. We performed a detailed spatiotemporal analysis of the displacements using a principal component analysis inversion method (PCAIM). The PCAIM reveals a source with no significant changes in shape and dimension and with a remarkably linear strength increase over the whole period of observation (i.e., [2003][2004][2005][2006][2007][2008][2009][2010]. Then we used a three-dimensional mixed boundary element method (MBEM) to invert the first component of surface displacement as obtained from PCAIM. We explored a continuum of geometries from a shallow elliptic crack to a deep massive truncated elliptical cone that could represent a sill or a large magma chamber, respectively. The best models indicate a large flat-topped source with a roof area between 40 and 670 km 2 and a depth of between 2 and 14 km below ground surface. Lastly, on the basis of the limited data available for the thermomechanical structure of the crust in the Southern Andean Central Volcanic Zone, we consider some possible scenarios to explain the spatial and temporal pattern of displacements at Lazufre.

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The Cerro Galan ignimbrite

Cited by 44 publications

References 52 publications

A re-appraisal of the stratigraphy and volcanology of the Cerro Galán volcanic system, NW Argentina

A re-appraisal of the stratigraphy and volcanology of the Cerro Galán volcanic system, NW Argentina

Eruption Styles and Processes of the Dongmakgol Tuff, Cheolwon Basin, Korea

Persistent uplift of the Lazufre volcanic complex (Central Andes): New insights from PCAIM inversion of InSAR time series and GPS data

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