Subsidence of Neogene basins in the southern Gulf of California

Author(s): Ingle, James C., Jr.
Author Affiliation(s): Primary:
Stanford University, Department of Geological and Environmental Sciences, Stanford, CA, United States
Volume Title: American Association of Petroleum Geologists 1996 annual convention
Source: Annual Meeting Expanded Abstracts - American Association of Petroleum Geologists, Vol.5, p.69; American Association of Petroleum Geologists 1996 annual convention, San Diego, CA, May 19-22, 1996. Publisher: American Association of Petroleum Geologists and Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States. ISSN: 0094-0038 CODEN: APGAB2
Note: In English
Summary: Stratigraphic, geochronologic, and paleobathymetric data from DSDP sites 475 and 476 offshore of Cabo San Lucas, Baja Sur, Mexico together data from onshore Neogene sequences exposed on (1) Isla Maria Madre in the gulf mouth, (2) Punta Mita on Nayarit coast of mainland Mexico, and (3) the San Jose del Cabo area of Baja Sur, allow rates and style of basin subsidence and margin deformation to be determined for the southernmost Gulf of California through application of backstripping techniques. Tectonic subsidence curves constructed for sequences overlying oceanic, transitional, and continental crust reveal patterns of basin formation as the southernmost gulf evolved from (1) a flooded portion of the Basin and Range province to (2) a rifted setting associated with penetration of the East Pacific Rise. The distribution of Miocene (12 to 6 Ma) and Pliocene marine sediments in this region indicates that major marine depocenters shifted westward ca. 5 Ma in concert with (1) uplift and deformation of the eastern margin of the Miocene proto-gulf and (2) rapid subsidence and formation of the modern Gulf of California as rifting and spreading occurred along the relocated East Pacific Rise during Pliocene time. Subsequent Plio-Pleistocene (ca. 2 to 0.7 Ma) deformation and uplift along the eastern margin of the newly formed peninsula of Baja California again shifted major depocenters to their modern positions within the evolving gulf. Analysis of magnetic anomaly patterns and microplate history in the eastern Pacific and gulf region by Atwater, Curray, Klitgord, Lonsdale, Mammericks, Stock, and others permit tentative correlations of major plate events and individual basin histories.
Year of Publication: 1996
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 18 Geophysics, Solid-Earth; Baja California Sur Mexico; Basins; Cabo San Lucas Mexico; Cenozoic; DSDP Site 475; DSDP Site 476; Deep Sea Drilling Project; Deformation; East Pacific; East Pacific Rise; Evolution; Gulf of California; IPOD; Leg 64; Magnetic anomalies; Mexico; Neogene; North Pacific; Northeast Pacific; Offshore; Pacific Ocean; Paleobathymetry; Plate tectonics; Pleistocene; Pliocene; Quaternary; Rifting; Sea-floor spreading; Southern Gulf of California; Subsidence; Tertiary
Coordinates: N230302 N230302 W1090312 W1090312
N230226 N230226 W1091521 W1091521
Record ID: 1997017407
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States