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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2009
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| Online Access: | https://www.redalyc.org/articulo.oa?id=56813220002 |
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Table of Contents:
- Deep structural setting of the North American-Caribbean plate boundary in eastern Guatemala E. Lodolo M. Menichetti M. Guzmán-Speziale G. Giunta C. Zanolla Ciencias de la Tierra Polochic gravity modeling Eastern Guatemala deep crustal structure Motagua transform systems Two-dimensional inverse gravity modeling is presented to help determine the deep structural framework of the left-lateral Polochic-Motagua fault systems. They represent a major segment of the North American-Caribbean plate boundary. These seismically active tectonic lineaments, crossing broadly E-W Guatemala, are superimposed over a narrow suture where slices of ophiolitic assemblages crop out. Within the principal displacement zone of the fault systems, pull-apart basins and restraining zones (push-up) were formed. A fault population analysis along the strike of both fault systems in the Izabal and Motagua valleys, combined with satellite-derived data, have allowed determining the gross geometry and kinematics of the transform systems. Geological information and commercial seismic data were used to constrain the shallow geometry and structure of the plate boundary across a 60-km-long cross-section located to the east of Lago Izabal, the largest pull-apart basin formed along the Polochic transform system, and across the Motagua valley. The inverse gravity model fits the complete Bouguer anomaly map of the area and explains most of the observed long-wavelength anomalies, as well as the local anomalies associated with intracrustal and shallow crustal geological bodies. The main features derived from the integrated geophysical-geological approach are the geometry and depth of sedimentary basins associated with the transform systems, and the root of the ophiolitic bodies in the suture zone. 2009 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56813220002 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.3 Vol.48