Simple mixing as the major control of the evolution of volcanic suites in the Ecuadorian Andes

Schiano, Pierre; Monzier, Michel; Eissen, Jean‐Philippe; Martin, Hervé; Koga, Kenneth T.

doi:10.1007/s00410-009-0478-2

Cited by 348 publications

(123 citation statements)

References 73 publications

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“…On the Th/Nd verses Th diagram, the parental magma of the NE trending dykes define a flat array indicating fractional crystallization (Schiano et al, 2010; Fig. 6), whereas the NW trending dykes fall in a steep array indicating partial melting or mixing process.…”

Section: Ne Trending Dykesmentioning

confidence: 99%

“…The data of NE trending dykes define flat arrays indicating the importance of fractional crystallization. The inset diagram shows a schematic C H /C M versus C H diagram (where C H and C M are the concentrations of H, a highly incompatible element, and M, a moderately incompatible element) showing theoretical correlation curves during fractional crystallization, partial melting and mixing processes(Schiano et al, 2010).…”

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confidence: 99%

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Geochemical and isotopic constraints on the evolution of Late Paleozoic dyke swarms in West Junggar, Xinjiang, China

Zhan

Hou

Hari

et al. 2015

Journal of Asian Earth Sciences

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Section: Ne Trending Dykesmentioning

confidence: 99%

mentioning

confidence: 99%

Geochemical and isotopic constraints on the evolution of Late Paleozoic dyke swarms in West Junggar, Xinjiang, China

Zhan

Hou

Hari

et al. 2015

Journal of Asian Earth Sciences

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“…In contrast, the geochemical changes point to a magma mixing process, whose end-members are a primitive Rucu Pichincha andesite and a Toaza dacite. Geochemical (Schiano et al 2010) and mineralogical data (Samaniego et al 2010) both point to the predominance of magma mixing between a mafic, trace-element depleted, mantle-derived end-member, and a siliceous, trace-element enriched end-member. The origin of these end-members, namely the genesis of the silica-rich dacites, was discussed by Samaniego et al (2010).…”

Section: Relationship Between Structural Development and Magma Chemistrymentioning

confidence: 99%

New radiometric and petrological constraints on the evolution of the Pichincha volcanic complex (Ecuador)

et al. 2010

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Link to publication in University of Groningen/UMCG research database Citation for published version (APA): Robin, C., Samaniego, P., Le Pennec, J-L., Fornari, M., Mothes, P., van der Plicht, J., & Stix, J. (Ed.) (2010). New radiometric and petrological constraints on the evolution of the Pichincha volcanic complex (Ecuador). Bulletin of Volcanology, 72(9), 1109-1129. DOI: 10.1007/s00445-010-0389-0 Copyright Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Abstract Fieldwork, radiometric ( 40 Ar/ 39 Ar and 14 C) ages and whole-rock geochemistry allow a reconstruction of eruptive stages at the active, mainly dacitic, Pichincha Volcanic Complex (PVC), whose eruptions have repeatedly threatened Quito, most recently from 1999 to 2001. After the emplacement of basal lavas dated at ∼1100 to 900 ka, the eruptive activity of the old Rucu Pichincha volcano lasted from ∼850 ka to ∼150 ka before present (BP) and resulted in a 15×20 km-wide edifice, which comprises three main building stages: (1) A lower stratocone (Lower Rucu, ∼160 km 3 in volume) developed from ∼850 to 600 ka; (2) This edifice was capped by a steeper-sided and less voluminous cone (the Upper Rucu, 40-50 km 3 ), the history of which started 450-430 ka ago and ended around 250 ka with a sector collapse; (3) A smaller (8-10 km 3 ) but more explosive edifice grew in the avalanche amphitheatre and ended Rucu Pichincha's history about 150 ka ago. The Guagua Pichincha volcano (GGP) was developed from 60 ka on the western flank of Rucu with four growth stages separated by major catastrophic events. (1) From ∼60 to 47 ka, a basal effusive stratocone developed, terminating with a large ash-and-pumice flow event. (2) This basal volcano was followed by a long-lasting dome building stage and related explosive episodes, the latter occurring between 28-30 and 22-23 ka. These first two stages formed the main GGP (∼30 km 3 ), a large part of which was removed by a major collapse 11 ka BP. (3) Sustained explosive activity and viscous lava extrusions gave rise to a new edifice, Toaza (4-5 km 3 in volume), which in turn collapsed around 4 ka BP. (4) The ensuing amphitheatre was partly filled by the ∼1-km 3 Cristal dome, which is the historically active centre of the Pichincha complex. The average output rate for the whole PVC is 0.29 km 3 /ka. Nevertheless, the chronostratigraphic resolution we obtained for Lower Rucu Pichincha and for the two main edifices of Guagua Pichincha (main GGP and Toaza), leads to eruptive rates of 0.60-0.65 km 3 /ka during these construction stages. These output rates are compared to those of other mainly dacitic volcanoes from continental arcs. Our study also su...

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“…An arcuate trend on the plot of La/Sm vs La (Fig. 8h) also indicates the mixed character of the KIC magmas (Schiano et al, 2010).…”

Section: Magma Sourcementioning

confidence: 99%

“…Partial melting of the source region can be identified by the ratio of the concentration of a highly incompatible element to a moderately incompatible element (Schiano et al, 2010). The KIC volcanic rocks exhibit a linear trend on a La/Yb vs La diagram, indicating that the primary magma was generated by partial melting of the source materials ( Fig.…”

Section: Magma Evolutionmentioning

confidence: 99%

Pamir Plateau formation and crustal thickening before the India-Asia collision inferred from dating and petrology of the 110–92 Ma Southern Pamir volcanic sequence

et al. 2017

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The formation of the Pamir is a key component of the India-Asia collision with major implications for lithospheric processes, plateau formation, land-sea configurations and associated climate changes. Although the formation of the Pamir is traditionally linked to Cenozoic processes associated with the IndiaAsia collision, the contribution of the Mesozoic tectonic evolution remains poorly understood. The Pamir was formed by the suturing of Gondwanan terranes to the south margin of Eurasia, however, the timing and tectonic mechanisms associated with this Mesozoic accretion remains poorly constrained. These processes are recorded by several igneous belts within these terranes, which are not well studied. Within the Southern Pamir, the Albian-

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Simple mixing as the major control of the evolution of volcanic suites in the Ecuadorian Andes

Abstract: International audienc

Cited by 348 publications

References 73 publications

Geochemical and isotopic constraints on the evolution of Late Paleozoic dyke swarms in West Junggar, Xinjiang, China

Geochemical and isotopic constraints on the evolution of Late Paleozoic dyke swarms in West Junggar, Xinjiang, China

New radiometric and petrological constraints on the evolution of the Pichincha volcanic complex (Ecuador)

Pamir Plateau formation and crustal thickening before the India-Asia collision inferred from dating and petrology of the 110–92 Ma Southern Pamir volcanic sequence

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