Start |Author Index | View Uploaded Presentations | Meeting Information

Cordilleran Section - 99th Annual (April 1–3, 2003)

Paper No. 3
Presentation Time: 9:10 AM

STRATIGRAPHY, SEDIMENTOLOGY, AND PROVENANCE EVOLUTION OF EARLY CRETACEOUS ARCS, THE GUERRERO TERRANE (SW MEXICO): BASED ON DETAILS STUDIES OF THE HUETAMO AND TELOLOAPAN AREAS


GUERRERO-SUASTEGUI, Martin1, RAMIREZ-ESPINOSA, Joel1 and HISCOTT, Richard N.2, (1)Escuela Regional de Ciencias de la Tierra, Universidad Autónoma de Guerrero, Ex-Hacienda de San Juan Bautista, Taxco, Gro, 197, Mexico, (2)Earth Sciences, Memorial Univ of Newfoundland, St. John´s, NF A1B 3X5, Canada, mgros62@yahoo.com.mx

The Guerrero Terrane is subdivided in three subterranes: Zihuatanejo-Huetamo, Arcelia-Palmar Chico, and Teloloapan Subterranes. This study documents the stratigraphy, sedimentology, and provenance of two early Cretaceous arc-related sequences.

Zihuatanejo-Huetamo Subterrane (Huetamo area). Early Cretaceous (Hauterivian-Cenomanian) formations of the Huetamo area are clastic, volcaniclastic, and scarse volcanic rocks (Angao and San Lucas formations), and clastic limestones to fossiliferous limestones (Comburindio and Mal Paso formations). The Angao and San Lucas formations contain conglomerates and sandstones with volcanic, sedimentary, and metamorphic clasts. Petrology suggests multiple sources for these clasts that include basemental, Paleozoic shallow marine rocks, and volcanic units.

Facies Analysis of the Angao and San Lucas formations suggests a submarine fan deposit. Conglomerates represent proximal channelized facies while sandstone facies show middle to distal submarine fan. The upper part of the San Lucas Formation developed a deltaic setting. Limestone facies form an isolated arc-related platform.

Teloloapan Subterrane (Teloloapan area). This area contains massive and pillow basaltic-andesitic lavas, volcaniclastic, and clastic rocks of Berriasian-Upper Aptian age (Villa Ayala and Acapetlahuaya formations). Upper Aptian-Albian fossiliferous limestone (Teloloapan Formation)are interbedded in the lowestmost levels with volcaniclastic that cover the arc-related sequences. The arc sequences present an homogeneous basaltic-andesitic calc-alkaline lavas, while the volcaniclastic and clastic rocks show an inmature to transitional arc provenance.

Four facies are recognized in this subterrane: primary volcanic represents the eruptive products of the arc; conglomerates and volcanic breccias form the subaqueous syn-eruptive deposits, debris flows, and high density turbidity deposits; fine- to meddium-bedded volcaniclastic rocks suggest turbidity deposits; and hybrid and limestone rocks represent an arc-related platforms with well defined platform facies.

The data support a back-arc setting for the Huetamo area and an intra-arc basin for the Teloloapan region. An independent evolution and accretional history for each subterrane is done.

Session No. 34

T8. Sedimentation in Ancient and Recent Volcanic Arcs
Thursday, 3 April 2003: 8:30 AM-12:05 PM
Geological Society of America Abstracts with Programs. Vol. 35, No. 4, February 2003, p.76
© Copyright 2003 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.
Back to: T8. Sedimentation in Ancient and Recent Volcanic Arcs
<< Previous Abstract | Next Abstract >>