At the end of active subduction along the North American plate (12.5 Ma), in the Baja California peninsula arc magmatism was replaced mainly by alkali-rich high-Mg basaltic andesites and andesites with peculiar and unusually high K/Rb, Sr/Rb, and LREE/HREE ratios defined "bajaite' by Rogers et al. (1985) and "Baja alkalic suite' by Sawlan (1991). Two interesting features of this magmatic change are represented by: 1) emplacement of transitional, high-K calc-alkaline andesites that preceded, in places, the Baja alkalic suite magmatism and 2) subduction unrelated medium-K calc-alkaline magmatism in Baja California Sur, active in areas within the Gulf of California Rift. A previously unknown example of this calc-alkaline activity was studied in the area of Cerro Mencenares located north of Loreto, Baja California Sur. -from Authors

Bigioggero, B., Chiesa, S., Zanchi, A., Montrasio, A., & Vezzoli, L. (1995). The Cerro Mencenares volcanic center, Baja California Sur: source and tectonic control on postsubduction magmatism within the Gulf Rift. GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 107(9), 1108-1122 [10.1130/0016-7606(1995)107<1108:TCMVCB>2.3.CO;2].

The Cerro Mencenares volcanic center, Baja California Sur: source and tectonic control on postsubduction magmatism within the Gulf Rift

BIGIOGGERO, BIAGIO FRANCO CARLO
Primo
;
ZANCHI, ANDREA MARCO;
1995

Abstract

At the end of active subduction along the North American plate (12.5 Ma), in the Baja California peninsula arc magmatism was replaced mainly by alkali-rich high-Mg basaltic andesites and andesites with peculiar and unusually high K/Rb, Sr/Rb, and LREE/HREE ratios defined "bajaite' by Rogers et al. (1985) and "Baja alkalic suite' by Sawlan (1991). Two interesting features of this magmatic change are represented by: 1) emplacement of transitional, high-K calc-alkaline andesites that preceded, in places, the Baja alkalic suite magmatism and 2) subduction unrelated medium-K calc-alkaline magmatism in Baja California Sur, active in areas within the Gulf of California Rift. A previously unknown example of this calc-alkaline activity was studied in the area of Cerro Mencenares located north of Loreto, Baja California Sur. -from Authors
Articolo in rivista - Articolo scientifico
2300; Earth and Planetary Sciences (all)
English
1108
1122
15
Bigioggero, B., Chiesa, S., Zanchi, A., Montrasio, A., & Vezzoli, L. (1995). The Cerro Mencenares volcanic center, Baja California Sur: source and tectonic control on postsubduction magmatism within the Gulf Rift. GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 107(9), 1108-1122 [10.1130/0016-7606(1995)107<1108:TCMVCB>2.3.CO;2].
Bigioggero, B; Chiesa, S; Zanchi, A; Montrasio, A; Vezzoli, L
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/130312
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