Tectonics of the Pliocene Loreto Basin, Baja California Sur, Mexico, and evolution of the Gulf of California

Paul J Umhoefer, R. J. Dorsey, P. Renne

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Abstract

The Pliocene Loreto basin is a transtensional basin that consists of nonmarine to marine sedimentary rocks and interbedded tuffs. On the basis of stratigraphic study and 40Ar/39Ar dating of tuffs, the southern Loreto basin began to form at ~3.4 Ma as an alluvial basin with moderate rates of subsidence. Between 2.46 and 2.36 Ma, extremely rapid subsidence of the basin was accompanied by deposition of vertically stacked Gilbert-type fan deltas. During this period, the southernmost basin began to be cut by an array of dextral-normal faults. The basin returned to a moderate rate of subsidence from ~2.36 to ~2.0 Ma. The major change in the Loreto basin at 2.46 Ma may be coeval with the beginning of faulting in southern California on the Elsinore and San Jacinto faults. -from Authors

Original languageEnglish (US)
Pages (from-to)649-652
Number of pages4
JournalGeology
Volume22
Issue number7
DOIs
StatePublished - 1994

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ASJC Scopus subject areas

  • Geology

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