Cocorp Seismic Traverse Across the Rio Grande Rift
L.D. Brown, S. Kaufman, J.E. Oliver, 1983. "Cocorp Seismic Traverse Across the Rio Grande Rift", Seismic Expression of Structural Styles: A Picture and Work Atlas. Volume 1–The Layered Earth, Volume 2–Tectonics Of Extensional Provinces, & Volume 3–Tectonics Of Compressional Provinces, A. W. Bally
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COCORP's deep seismic reflection surveys in the Rio Grande Rift of central New Mexico consist of six lines recorded in 1975 and 1976 (Figure 1). Two of these, lines 1 and 1A, constitute an east-west traverse across the southern end of the Albuquerque-Belen basin. Although collected during an early stage of the COCORP program when economic constraints limited the amount of 3D control which could be obtained and data processing was less intensive, these seismic sections clearly map substantial buried structural relief, with the Albuquerque basin separated into two subgrabens by a central buried horst. Normal faulting in the eastern part of the rift may have been influenced by pre-existing Laramide thrust faults. Perhaps the most unique feature of these deep seismic data is evidence of an unusually strong mid-crustal reflection which is interpreted to correspond to an active magma body. This deep magma appears to have accumulated as series of sills beneath a mid-crustal barrier. The following summary is abstracted from a fuller discussion of the COCORP New Mexico results reported by Brown et al (1980).