Structure of the Espanola Basin, Rio Grande Rift, New Mexico, from SAGE seismic and gravity data

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Seismic and gravity data, acquired by the SAGE program over the past twelve years, are used to define the geometry of the Espanola basin and the extent of pre-Tertiary sedimentary rocks. The Paleozoic and Mesozoic units have been thinned and removed during Laramide uplift in an area now obscured by the younger rift basin. The Espanola basin is generally a shallow, asymmetric transitional structure between deeper, better developed basins to the northeast and southwest. The gravity data indicate the presence of three narrow, but deep, structural lows arrayed along the Embudo/Pajarito fault system. These sub-basins seem to be younger than ... continued below

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23 p.

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Ferguson, J.F.; Baldridge, W.S.; Braile, L.W.; Biehler, S.; Gilpin, B. & Jiracek, G.R. April 1, 1995.

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  • Ferguson, J.F. Univ. of Texas, Richardson, TX (United States)
  • Baldridge, W.S. Los Alamos National Lab., NM (United States)
  • Braile, L.W. Purdue Univ., West Lafayette, IN (United States). Dept. of Earth and Atmospheric Sciences
  • Biehler, S. Univ. of California, Riverside, CA (United States). Dept. of Earth Sciences
  • Gilpin, B. Golden West College, Huntington Beach, CA (United States). Dept. of Physics
  • Jiracek, G.R. San Diego State Univ., San Diego, CA (United States). Dept. of Geological Sciences

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Description

Seismic and gravity data, acquired by the SAGE program over the past twelve years, are used to define the geometry of the Espanola basin and the extent of pre-Tertiary sedimentary rocks. The Paleozoic and Mesozoic units have been thinned and removed during Laramide uplift in an area now obscured by the younger rift basin. The Espanola basin is generally a shallow, asymmetric transitional structure between deeper, better developed basins to the northeast and southwest. The gravity data indicate the presence of three narrow, but deep, structural lows arrayed along the Embudo/Pajarito fault system. These sub-basins seem to be younger than the faults on the basin margins. This apparent focussing of deformation in the later history of the basin may be a response to changes in regional stress or more local accommodation of the rift extension. Future work is planned to develop seismic data over one of these sub-basins, the Velarde graben, and to better define the gravity map in order to facilitate three-dimensional modeling.

Physical Description

23 p.

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OSTI as DE95009428

Source

  • 1995 New Mexico Geological Society fall field conference, Santa Fe, NM (United States), 25-29 Sep 1995

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  • Other: DE95009428
  • Report No.: LA-UR--95-887
  • Report No.: CONF-9509119--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 78589
  • Archival Resource Key: ark:/67531/metadc716298

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  • April 1, 1995

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  • Sept. 29, 2015, 5:31 a.m.

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  • Feb. 29, 2016, 7:41 p.m.

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Ferguson, J.F.; Baldridge, W.S.; Braile, L.W.; Biehler, S.; Gilpin, B. & Jiracek, G.R. Structure of the Espanola Basin, Rio Grande Rift, New Mexico, from SAGE seismic and gravity data, article, April 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc716298/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.