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Stratigraphy and st...
Stratigraphy and structure of Chachahuén volcanic complex, southern Mendoza province, Argentina
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- Palma, J. Octavio (författare)
- Y TEC CONICET, Ave Petr S-N,Entre 129 Y 143, Buenos Aires, Argentina.;Univ Oslo, NJORD Ctr, Dept Geosci, POB 1047 Blindern, Oslo, Norway.
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- Burchardt, Steffi, 1982- (författare)
- Uppsala universitet,Mineralogi, petrologi och tektonik,Center for Natural Hazard and Distaster Science
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- Schmiedel, Tobias (författare)
- Uppsala universitet,Mineralogi, petrologi och tektonik,Univ Oslo, NJORD Ctr, Dept Geosci, POB 1047 Blindern, Oslo, Norway
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- Guerriero, Lucas (författare)
- YPF, Ave Petr S-N,Entre 129 & 143, RA-1923 Buenos Aires, Argentina.
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- Jerram, Dougal A. (författare)
- Univ Oslo, NJORD Ctr, Dept Geosci, POB 1047, Oslo, Norway.;DougalEARTH Ltd, 31 Whitefields Crescent, Solihull B91 3NU, England.
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- Mair, Karen (författare)
- Univ Oslo, NJORD Ctr, Dept Geosci, POB 1047 Blindern, Oslo, Norway.
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- Leanza, Héctor A. (författare)
- Consejo Nacl Invest Cient & Tecn, Museo Argentino Ciencias Nat MACN, RA-1405 Buenos Aires, Argentina.
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- Galland, Olivier (författare)
- Univ Oslo, NJORD Ctr, Dept Geosci, POB 1047 Blindern, Oslo, Norway.
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Y TEC CONICET, Ave Petr S-N,Entre 129 Y 143, Buenos Aires, Argentina;Univ Oslo, NJORD Ctr, Dept Geosci, POB 1047 Blindern, Oslo, Norway. Mineralogi, petrologi och tektonik (creator_code:org_t)
- Elsevier, 2024
- 2024
- Engelska.
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Ingår i: Journal of South American Earth Sciences. - : Elsevier. - 0895-9811 .- 1873-0647. ; 140
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The Chachahuén Volcanic Complex is an eroded Upper Miocene arc to back-arc volcanic system that was emplaced in the north-eastern edge of the Neuquén Basin, southern Mendoza province, Argentina. It was formed as the result of shallowing followed by steepening of the Nazca plate during Miocene-Pliocene, and is characterized by a volcanism which ranges from trachydacites to basalts. Thanks to erosion, the stratigraphy and the shallow plumbing systems of the volcano are well-exposed. A new evolution for the volcano stratigraphy is proposed, based on new field observations, satellite imagery, and incorporating the radiometric and petrological data of previous works. The stratigraphy is constrained around one main explosive event, recorded by a thick dacitic pyroclastic density current (PDC) deposit (the Corrales Ignimbrite) (>150m). The main units forming the Chachahuén Volcanic Complex are (1) the pre-dacite PDC deposits (trachydacitic to rhyolitic) Vizcachas Formation, (2) the thick Corrales Ignimbrite, (3) a post-dacite trachyandesitic PDC deposits (dominated by block and ash (BAF) deposits) and thick lava flows, and (4) thin mafic basaltic lava flows. The collapse of a large elliptical caldera occurred during the Trachyandesite phase. The main magma transport channels and feeders are sub-vertical dykes, which exhibit a radial distribution centred on the main caldera depression. Moreover, cryptodomes mainly preserved outside the rim of the caldera accommodated the transport and emplacement of the more silicic magma during the Trachyandesite phase.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Nyckelord
- Arc volcano
- Volcano stratigraphy
- Chachahuen
- Neuquen basin
- Volcano plumbing system
- Cryptodomes
- Caldera collapse
- Dykes
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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