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Acapulco Trench to the Gulf of Mexico across southern Mexico

By Fernando Ortega-Gutiérrez

Abstract

DNAG Transect H-3. Part of GSA’s DNAG Continent-Ocean Transect Series, this transect contains all or most of the following: free-air gravity and magnetic anomaly profiles, heat flow measurements, geologic cross section with no vertical exaggeration, multi-channel seismic reflection profiles, tectonic kindred cross section with vertical exaggeration, geologic map, stratigraphic diagram, and an index map. All transects are on a scale of 1:500,000.

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    Abstract

    Transect H-3 extends 460 krn across southern Mexico from the Pacific Ocean to the Gulf of Mexico, far south of cratonic North America. The transect has two segments: one trending N7°E from the axis of the Acapulco Trench to central Oaxaca and another extending N53°W from central Oaxaca to the Gulf of Mexico. The cross sections lie near the middle of the transect and coincide with a line connecting Puerto Escondido at the Pacific coast, the city of Oaxaca, and San Martin Tuxtlas Volcano near the NE end of the transect

    The mosaic of geologic provinces along the corridor made it convenient to use a tectonostratigraphic approach for the analysis of the geologic history. Terrane nomenclature in this report is derived from names of pre-Hispanic cultures dominant in each respective region. The geologic description of terranes and the bases of their discrimination are given below.

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