Petrogenesis of the Eocene and Mio-Pliocene alkaline basaltic magmatism in Meseta Chile Chico, southern Patagonia, Chile: Evidence for the participation of two slab windows

Felipe Espinoza, Diego Morata, Ewan Pelleter, René C. Maury, Manuel Suárez, Yves Lagabrielle, Mireille Polvé, Hervé Bellon, Joseph Cotten, Rita De la Cruz, Christelle Guivel

Resultado de la investigación: Article

50 Citas (Scopus)

Resumen

The Meseta Chile Chico (MCC, 46.4°S) is the westernmost exposure of Eocene (lower basaltic sequence, LBS; 55-40 Ma, K-Ar ages) and Mio-Pliocene (upper basaltic sequence, UBS; 16-4 Ma, K-Ar ages) flood basalt volcanism in Patagonia. The MCC is located south of the Lago General Carrera-Buenos Aires (LGCBA), southeast from the present day Chile Triple Junction (CTJ), east of the actual volcanic gap between Southern South Volcanic Zone and Austral Volcanic Zone (SSVZ and AVZ, respectively) and just above the inferred location of the South Chile Ridge segment subducted at ∼6 Ma (SCR-1). Erupted products consist of mainly ne-normative olivine basalt with minor hy-normative tholeiites basalt, trachybasalt and basanite. MCC lavas are alkaline (42.7-53.1 wt.% SiO2, 3-8 wt.% Na2O+K2O) and relatively primitive (Ni: 133-360 ppm, Cr: 161-193 ppm, Co: 35-72 ppm, 4-16.5 MgO wt.%). They have a marked OIB-like signature, as shown by their isotopic compositions (87Sr/86Sro =0.70311-0.70414 and εNd=+4.7-+5.1) and their incompatible trace elements ratios (Ba/La=10-20, La/Nb=0.46-1.09, Ce/Pb=15.52-27.5, Sr/La<25), reflecting deep mantle origin. UBS-primitive lavas have characteristics similar to those of the Eocene LBS basalts, while UBS-intermediate lavas show geochemical imprints (La/Nb>1, Sr/La>25, low Ce/Pb, Nb/U) compatible with contamination by arc/slab-derived and/or crustal components. We propose that the genesis and extrusion of magmas is related to the opening of two slab windows due to the subduction of two active ridge segments beneath Patagonia during Eocene and Mio-Pliocene.

Idioma originalEnglish
Páginas (desde-hasta)315-343
Número de páginas29
PublicaciónLithos
Volumen82
N.º3-4 SPEC. ISS.
DOI
EstadoPublished - 1 jun 2005

Huella dactilar

petrogenesis
magmatism
slab
Pliocene
Eocene
basalt
basanite
triple junction
ocean island basalt
flood basalt
extrusion
volcanism
olivine
isotopic composition
subduction
Trace Elements
trace element
Thyristors
Extrusion
Contamination

ASJC Scopus subject areas

  • Geochemistry and Petrology

Citar esto

Espinoza, Felipe ; Morata, Diego ; Pelleter, Ewan ; Maury, René C. ; Suárez, Manuel ; Lagabrielle, Yves ; Polvé, Mireille ; Bellon, Hervé ; Cotten, Joseph ; De la Cruz, Rita ; Guivel, Christelle. / Petrogenesis of the Eocene and Mio-Pliocene alkaline basaltic magmatism in Meseta Chile Chico, southern Patagonia, Chile : Evidence for the participation of two slab windows. En: Lithos. 2005 ; Vol. 82, N.º 3-4 SPEC. ISS. pp. 315-343.
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title = "Petrogenesis of the Eocene and Mio-Pliocene alkaline basaltic magmatism in Meseta Chile Chico, southern Patagonia, Chile: Evidence for the participation of two slab windows",
abstract = "The Meseta Chile Chico (MCC, 46.4°S) is the westernmost exposure of Eocene (lower basaltic sequence, LBS; 55-40 Ma, K-Ar ages) and Mio-Pliocene (upper basaltic sequence, UBS; 16-4 Ma, K-Ar ages) flood basalt volcanism in Patagonia. The MCC is located south of the Lago General Carrera-Buenos Aires (LGCBA), southeast from the present day Chile Triple Junction (CTJ), east of the actual volcanic gap between Southern South Volcanic Zone and Austral Volcanic Zone (SSVZ and AVZ, respectively) and just above the inferred location of the South Chile Ridge segment subducted at ∼6 Ma (SCR-1). Erupted products consist of mainly ne-normative olivine basalt with minor hy-normative tholeiites basalt, trachybasalt and basanite. MCC lavas are alkaline (42.7-53.1 wt.{\%} SiO2, 3-8 wt.{\%} Na2O+K2O) and relatively primitive (Ni: 133-360 ppm, Cr: 161-193 ppm, Co: 35-72 ppm, 4-16.5 MgO wt.{\%}). They have a marked OIB-like signature, as shown by their isotopic compositions (87Sr/86Sro =0.70311-0.70414 and εNd=+4.7-+5.1) and their incompatible trace elements ratios (Ba/La=10-20, La/Nb=0.46-1.09, Ce/Pb=15.52-27.5, Sr/La<25), reflecting deep mantle origin. UBS-primitive lavas have characteristics similar to those of the Eocene LBS basalts, while UBS-intermediate lavas show geochemical imprints (La/Nb>1, Sr/La>25, low Ce/Pb, Nb/U) compatible with contamination by arc/slab-derived and/or crustal components. We propose that the genesis and extrusion of magmas is related to the opening of two slab windows due to the subduction of two active ridge segments beneath Patagonia during Eocene and Mio-Pliocene.",
keywords = "Alkali basalts, Chilean Patagonia, Geochemistry, K-Ar ages, Slab window",
author = "Felipe Espinoza and Diego Morata and Ewan Pelleter and Maury, {Ren{\'e} C.} and Manuel Su{\'a}rez and Yves Lagabrielle and Mireille Polv{\'e} and Herv{\'e} Bellon and Joseph Cotten and {De la Cruz}, Rita and Christelle Guivel",
year = "2005",
month = "6",
day = "1",
doi = "10.1016/j.lithos.2004.09.024",
language = "English",
volume = "82",
pages = "315--343",
journal = "Lithos",
issn = "0024-4937",
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Espinoza, F, Morata, D, Pelleter, E, Maury, RC, Suárez, M, Lagabrielle, Y, Polvé, M, Bellon, H, Cotten, J, De la Cruz, R & Guivel, C 2005, 'Petrogenesis of the Eocene and Mio-Pliocene alkaline basaltic magmatism in Meseta Chile Chico, southern Patagonia, Chile: Evidence for the participation of two slab windows', Lithos, vol. 82, n.º 3-4 SPEC. ISS., pp. 315-343. https://doi.org/10.1016/j.lithos.2004.09.024

Petrogenesis of the Eocene and Mio-Pliocene alkaline basaltic magmatism in Meseta Chile Chico, southern Patagonia, Chile : Evidence for the participation of two slab windows. / Espinoza, Felipe; Morata, Diego; Pelleter, Ewan; Maury, René C.; Suárez, Manuel; Lagabrielle, Yves; Polvé, Mireille; Bellon, Hervé; Cotten, Joseph; De la Cruz, Rita; Guivel, Christelle.

En: Lithos, Vol. 82, N.º 3-4 SPEC. ISS., 01.06.2005, p. 315-343.

Resultado de la investigación: Article

TY - JOUR

T1 - Petrogenesis of the Eocene and Mio-Pliocene alkaline basaltic magmatism in Meseta Chile Chico, southern Patagonia, Chile

T2 - Evidence for the participation of two slab windows

AU - Espinoza, Felipe

AU - Morata, Diego

AU - Pelleter, Ewan

AU - Maury, René C.

AU - Suárez, Manuel

AU - Lagabrielle, Yves

AU - Polvé, Mireille

AU - Bellon, Hervé

AU - Cotten, Joseph

AU - De la Cruz, Rita

AU - Guivel, Christelle

PY - 2005/6/1

Y1 - 2005/6/1

N2 - The Meseta Chile Chico (MCC, 46.4°S) is the westernmost exposure of Eocene (lower basaltic sequence, LBS; 55-40 Ma, K-Ar ages) and Mio-Pliocene (upper basaltic sequence, UBS; 16-4 Ma, K-Ar ages) flood basalt volcanism in Patagonia. The MCC is located south of the Lago General Carrera-Buenos Aires (LGCBA), southeast from the present day Chile Triple Junction (CTJ), east of the actual volcanic gap between Southern South Volcanic Zone and Austral Volcanic Zone (SSVZ and AVZ, respectively) and just above the inferred location of the South Chile Ridge segment subducted at ∼6 Ma (SCR-1). Erupted products consist of mainly ne-normative olivine basalt with minor hy-normative tholeiites basalt, trachybasalt and basanite. MCC lavas are alkaline (42.7-53.1 wt.% SiO2, 3-8 wt.% Na2O+K2O) and relatively primitive (Ni: 133-360 ppm, Cr: 161-193 ppm, Co: 35-72 ppm, 4-16.5 MgO wt.%). They have a marked OIB-like signature, as shown by their isotopic compositions (87Sr/86Sro =0.70311-0.70414 and εNd=+4.7-+5.1) and their incompatible trace elements ratios (Ba/La=10-20, La/Nb=0.46-1.09, Ce/Pb=15.52-27.5, Sr/La<25), reflecting deep mantle origin. UBS-primitive lavas have characteristics similar to those of the Eocene LBS basalts, while UBS-intermediate lavas show geochemical imprints (La/Nb>1, Sr/La>25, low Ce/Pb, Nb/U) compatible with contamination by arc/slab-derived and/or crustal components. We propose that the genesis and extrusion of magmas is related to the opening of two slab windows due to the subduction of two active ridge segments beneath Patagonia during Eocene and Mio-Pliocene.

AB - The Meseta Chile Chico (MCC, 46.4°S) is the westernmost exposure of Eocene (lower basaltic sequence, LBS; 55-40 Ma, K-Ar ages) and Mio-Pliocene (upper basaltic sequence, UBS; 16-4 Ma, K-Ar ages) flood basalt volcanism in Patagonia. The MCC is located south of the Lago General Carrera-Buenos Aires (LGCBA), southeast from the present day Chile Triple Junction (CTJ), east of the actual volcanic gap between Southern South Volcanic Zone and Austral Volcanic Zone (SSVZ and AVZ, respectively) and just above the inferred location of the South Chile Ridge segment subducted at ∼6 Ma (SCR-1). Erupted products consist of mainly ne-normative olivine basalt with minor hy-normative tholeiites basalt, trachybasalt and basanite. MCC lavas are alkaline (42.7-53.1 wt.% SiO2, 3-8 wt.% Na2O+K2O) and relatively primitive (Ni: 133-360 ppm, Cr: 161-193 ppm, Co: 35-72 ppm, 4-16.5 MgO wt.%). They have a marked OIB-like signature, as shown by their isotopic compositions (87Sr/86Sro =0.70311-0.70414 and εNd=+4.7-+5.1) and their incompatible trace elements ratios (Ba/La=10-20, La/Nb=0.46-1.09, Ce/Pb=15.52-27.5, Sr/La<25), reflecting deep mantle origin. UBS-primitive lavas have characteristics similar to those of the Eocene LBS basalts, while UBS-intermediate lavas show geochemical imprints (La/Nb>1, Sr/La>25, low Ce/Pb, Nb/U) compatible with contamination by arc/slab-derived and/or crustal components. We propose that the genesis and extrusion of magmas is related to the opening of two slab windows due to the subduction of two active ridge segments beneath Patagonia during Eocene and Mio-Pliocene.

KW - Alkali basalts

KW - Chilean Patagonia

KW - Geochemistry

KW - K-Ar ages

KW - Slab window

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U2 - 10.1016/j.lithos.2004.09.024

DO - 10.1016/j.lithos.2004.09.024

M3 - Article

AN - SCOPUS:21044439020

VL - 82

SP - 315

EP - 343

JO - Lithos

JF - Lithos

SN - 0024-4937

IS - 3-4 SPEC. ISS.

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