STRATIGRAPHY OF THE ALBUQUERQUE BASIN, RIO GRANDE RIFT, CENTRAL NEW MEXICO: A PROGRESS REPORT SEAN D. CONNELL New Mexico Bureau of Mines and Mineral Resources-Albuquerque Office, New Mexico Institute of Mining and Technology, 2808 Central Ave., SE, Albuquerque, New Mexico 87106,
[email protected] INTRODUCTION and northern sub-basin, respectively (Fig 5; Grauch et al., 1999). Deep oil-well data indicate that the The Albuquerque Basin of central New Mexico Calabacillas sub-basin and northern part of the Belen is one of the largest sedimentary basins of the Rio sub-basin contain as much as 4-5 km of synrift basin Grande rift, a chain of linked, predominantly fill (Lozinsky, 1994). The Santo Domingo sub-basin asymmetric or half-graben extensional basins that is a graben with a complicated subsidence history extend south from central Colorado, through central that represents a zone of accommodation between the New Mexico, and into western Texas and northern Albuquerque and Española basins (Smith et al., Mexico (Hawley, 1978; Chapin and Cather, 1994). 2001). The Hagan embayment is a northeast-dipping The Albuquerque Basin is about 60 km long, and structural re-entrant between the San Francisco and about 55 km wide and strongly faulted on nearly all La Bajada faults that contains the oldest exposed sides (Fig. 1). The Albuquerque Basin also represents Santa Fe Group strata in the basin. a transitional tectonic feature, lying between the The boundaries among the major sub-basins are west-tilted Española and Socorro half-graben basins. complicated, however, regional gravity and oil-test The Albuquerque Basin sits between the data can constrain their locations.