Geology, geochronology, and tectonic setting of the Jorullo Volcano region, Michoacan, Mexico
Por:
Guilbaud, MN, Siebe C., Layer P., Salinas S., Castro-Govea R., Garduno-Monroy, VH, Le Corvec N.
Publicada:
1 abr 2011
Resumen:
The Jorullo monogenetic volcano erupted 250 years ago at the southern border of the Trans-Mexican Volcanic Belt (TMVB), an area that records a long history of magmatic and tectonic activity. The oldest rocks that crop out in the area are early-Oligocene (32.7 +/- 0.2 Ma) dioritic to granitic (60-72 wt.% SiO(2)) plutons intruded by younger to contemporaneous (30.3 +/- 0.1 and 33.3 +/- 0.7 Ma) aplitic (76-78 wt.% SiO(2)) dikes and mineralized veins. Volcanic rocks related to these intrusives form a thick sequence exposed in cliffs, from the base of which an altered andesite (58 wt.% SiO(2)) was collected. The nearby epithermal Cu-mineralization of the Inguaran mining area to the southeast is also related to this Tertiary volcanic episode. The oldest expression of the TMVB in this area is represented by Pliocene (3.2-2.4 Ma) basaltic andesite to andesite (53-63 wt.% SiO(2)) lavas (with pyroxene olivine) forming extensive mesas, eroded mounds, and thick elongate flows, that were unconforma
Filiaciones:
Guilbaud, MN:
Univ Nacl Autonoma Mexico, Dept Vulcanol, Inst Geofis, Mexico City 04510, DF, Mexico
Siebe C.:
Univ Nacl Autonoma Mexico, Dept Vulcanol, Inst Geofis, Mexico City 04510, DF, Mexico
Layer P.:
Geophysical Institute, University of Alaska Fairbanks, Fairbanks, Alaska, United States
Salinas S.:
Univ Nacl Autonoma Mexico, Dept Vulcanol, Inst Geofis, Mexico City 04510, DF, Mexico
Castro-Govea R.:
Instituto Mexicano del Petróleo, Gustavo A. Madero, México D.F., Mexico
Le Corvec N.:
Geology, School of Environment, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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