Volcanic record of the arc-to-rift transition onshore of the Guaymas Basin in the Santa Rosalía area, Gulf of California, Baja California

The Gulf of California is an archetype of continental rupture through transtensional rifting, and exploitation of a thermally weakened arc to produce a rift. Volcanic rocks of central Baja California record the transition from calcalkaline arc magmatism, due to subduction of the Farallon plate (ca....

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Veröffentlicht in:	Geosphere (Boulder, Colo.) Colo.), 2020-08, Vol.16 (4), p.1012-1041
Hauptverfasser:	Busby, Cathy, Graettinger, Alison, López Martínez, Margarita, Medynski, Sarah, Niemi, Tina, Andrews, Claire, Bowman, Emilie, Gutierrez, Evelyn P, Henry, Matthew, Lodes, Emma, Ojeda, Judith, Rice, Jonathan, Andrews, Graham, Brown, Sarah
Format:	Artikel
Sprache:	eng
Schlagworte:	absolute age andesites Ar/Ar Baja California Sur Mexico Cenozoic chemical composition East Pacific Geochronology Guaymas Basin Gulf of California hafnium Hf-177/Hf-176 igneous and metamorphic rocks igneous rocks isotope ratios isotopes lithofacies lithostratigraphy magmatism mapping metals Mexico Miocene Neogene nesosilicates North Pacific Northeast Pacific orthosilicates Pacific Ocean Petrology plate tectonics rare earths rifting Santa Rosalia Mexico silicates spectra stable isotopes Tertiary trachyandesites U/Pb volcanic rocks X-ray fluorescence spectra zircon zircon group
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Beschreibung
Zusammenfassung:	The Gulf of California is an archetype of continental rupture through transtensional rifting, and exploitation of a thermally weakened arc to produce a rift. Volcanic rocks of central Baja California record the transition from calcalkaline arc magmatism, due to subduction of the Farallon plate (ca. 24-12 Ma), to rift magmatism, related to the opening of the Gulf of California (56% SiO2 and MgO
ISSN:	1553-040X 1553-040X
DOI:	10.1130/GES02094.1