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Jurassic volcanic rocks in northeastern Mexico: A possible remnant of a Cordilleran magmatic arc

Jones, Norris W. and McKee, James W. and Anderson, Thomas H. and Silver, Leon T. (1995) Jurassic volcanic rocks in northeastern Mexico: A possible remnant of a Cordilleran magmatic arc. In: Studies on the Mesozoic of Sonora and adjacent areas. Special papers (Geological Society of America). No.301. Geological Society of America , Boulder, CO, pp. 179-190. ISBN 9780813723013.

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Pre-Oxfordian Mesozoic subaerial volcanogenic rocks occur in a band extending northwest from Ciudad Victoria, Tamaulipas, to Santa Maria del Oro, Durango. These strata include Nazas, Rodeo, and Caopas Formations in Durango, Coahuila, and Zacatecas; La Boca Formation and its underlying volcanic basement at Canon de Huizachal, Tamaulipas; and volcanic units below La Joya Formation at Real de Catorce and Charcas, San Luis Potosi. Rocks at these localities have similar lithologies, stratigraphic positions, and paleontologic and isotopic ages. Field mapping in the Caopas-Pico de Teyra area, northern Zacatecas, and ancillary research provide insight into the nature of this suite. At least 3 km of abundant airfall tuff, tuffaceous siltstone, and uncommon ashflow tuff are present near Pico de Teyra; this sequence appears to belong to a more distal facies than the flows, breccias, and laharic conglomerates of the Nazas and Rodeo Formations exposed 25 km to the north. Porphyritic rhyolite (Caopas Formation) occurs within these volcanogenic rocks as a fault-bounded block and is interpreted as a cogenetic, subvolcanic pluton. A relatively undeformed portion of the Caopas has yielded a zircon U-Pb age of 158 ± 4 Ma. Petrographic and limited chemical data from these formations show that calc-alkaline andesite, dacite, and rhyolite are the most common compositions. The volcanogenic rocks in northeastern Mexico are south of the inferred trace of the Mojave-Sonora megashear. Their large volume, their lithologic and chemical characteristics, and their age suggest that these rocks may be a component of the Jurassic arc of western North America that was translated southeastward along the megashear.

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Additional Information:© 1995 Geological Society of America. Manuscript accepted by the Society January 24, 1995. We wish to thank M. Megan Miller and Joaquin Ruíz for their reviews of an early version of this paper, and Fred W. McDowell, José M. Grajales-Nishimura, and Cesar Jacques-Ayala for their most helpful final reviews. This work was supported by National Science Foundation Grant EAR-8705717, by the Faculty Development Fund at the University of Wisconsin, Oshkosh, and by the personal funds of L. T. Silver. Acknowledgement is also made to the donors of The Petroleum Research Fund, administered by the American Chemical Society, for partial support of this research. This is Caltech Division of Geological and Planetary Sciences Contribution No. 5087.
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University of Wisconsin, OshkoshUNSPECIFIED
American Chemical Society Petroleum Research FundUNSPECIFIED
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Caltech Division of Geological and Planetary Sciences5087
Series Name:Special papers (Geological Society of America)
Issue or Number:301
Record Number:CaltechAUTHORS:20150225-125536778
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Official Citation:Norris W. Jones, James W. McKee, Thomas H. Anderson, and Leon T. Silver Jurassic volcanic rocks in northeastern Mexico: A possible remnant of a Cordilleran magmatic arc Geological Society of America Special Papers, 1995, 301, p. 179-190, doi:10.1130/0-8137-2301-9.179
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55194
Deposited By: Tony Diaz
Deposited On:26 Feb 2015 04:09
Last Modified:10 Nov 2021 20:42

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