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New K-feldspar 40Ar/39Ar and apatite fission-track thermochronological data from the crystalline basement of the western Gulf of Mexico (basement core samples from Tamaulipas Arch, Tuxpan, and Jalapa–Santa Ana highs) and K-feldspar 40Ar/39Ar from field samples of the Chiapas Massif in southern Mexico provide valuable information on the tectonic history of the region, namely, the rifting and postrifting stages of evolution in the Gulf of Mexico. The onset of rifting was probably as early as ca. 216 Ma and was characterized by extensional faulting that led to cooling of the basement footwall blocks by...

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