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Abstract

AAPG Memoir 75, Chapter 2: Tectonic Blocks, Magmatic Arcs, and Ocean Terrains: A Preliminary Interpretation Based on Gravity, Outcrop, and Subsurface Data, Northeast-central Mexico, by Claudio Bartolini and Kevin Mickus, Pages 29 - 43
from:
AAPG Memoir 75: The Western Gulf of Mexico Basin: Tectonics, Sedimentary Basins, and Petroleum Systems, Edited by Claudio Bartolini, Richard T. Buffler, and Abelardo Cant
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Tectonic Blocks, Magmatic Arcs, and Oceanic Terrains: A Preliminary Interpretation Based on Gravity, Outcrop, and Subsurface Data, Northeast-central Mexico

Claudio Bartolini
International Geological Consultant, Houston, Texas, U.S.A.

Kevin Mickus
Department of Geosciences, Southwest Missouri State University, Springfield, Missouri, U.S.A.


ABSTRACT

Complex tectonic plate interactions at the end of the Paleozoic and early Mesozoic, particularly the undefined relationship between circum-Atlantic and circum-Pacific tectonic domains, do not permit a complete understanding of the crustal structure of north-central Mexico. Pre-Oxfordian geologic history, especially the existence of Permian-Early Triassic and Late Triassic-Middle Jurassic volcanic arcs, and general crustal structure of north-central Mexico are approached through gravity modeling and analysis of geologic and well data. Previous HitBouguerNext Hit and isostatic residual gravity-anomaly maps were interpreted to illustrate anomalies caused mostly by Mesozoic and Cenozoic tectonic events, including a large-amplitude, northerly trending gradient marking the edge of Cretaceous thrusting in the Sierra Madre Oriental in Tamaulipas and Nuevo Le243_o.jpg (458 bytes)n. This gravity gradient diverges in western Nuevo Le243_o.jpg (458 bytes)n with one branch trending into southern Coahuila, which also marks the northern limit of Cretaceous thrusting. However, the other branch that trends into northern Nuevo Le243_o.jpg (458 bytes)n, may be caused partially by pre-Cretaceous intrusive and metamorphic rocks or changes in the structural style of the thrust belt north of Monterrey. Lower Previous HitBouguerTop and isostatic residual gravity-anomaly values in central Mexico, as compared with eastern Mexico, indicate a thicker crust formed by the addition of Mesozoic magmatic arcs and sedimentary sequences. Smaller-wavelength isostatic residual gravity-anomalies correspond to Late Permian-Early Triassic plutons or density variations in the Precambrian basement rocks in eastern Tamaulipas and Nuevo Le243_o.jpg (458 bytes)n, possible Laramide-age intrusions along the Cretaceous thrust front in Tamaulipas and Nuevo Le243_o.jpg (458 bytes)n, and Mesozoic sedimentary basins, including the Parras Basin. There is no evidence for large-scale linear anomalies that would correspond to the Late Jurassic Mojave-Sonora megashear transpressive structure across northern Mexico.

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