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Bulletin 160—Tectonics, geochronology, and volcanism in the Southern Rocky Mountains and Rio Grande rift

By Steven M. Cather, William C. McIntosh, and Shari A. Kelley (editors), 2004.

The fifteen papers included in this volume represent decades of research on the tectonic and volcanic history of the Southern Rock Mountains and the Rio Grande rift of New Mexico and Colorado. Detailed geologic mapping, geophysics, and expanded geochronology datasets provide important new insights into the volcanic and tectonic history of New Mexico and document a complex history of Laramide-age faulting. Authors address the Laramide-age structural development of the Front Range of Colorado and identify previously unrecognized trends in the timing and distribution of latest Eocene to Pliocene volcanism in Colorado and New Mexico. A wealth of new geochronologic data is provided, including hundreds of previously unpublished dates. Among other things, these data document the eruptive history of the Ocate volcanic field and provide ages for some of the yongest lava flows in the state of New Mexico. The data in the appendices are provided in a form that allows them to be imported into other programs (including GIS software) for manipulation. Many of these papers are destined to become classics in the scientific literature on the Rio Grande rift and the Southern Rocky Mountains.


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Dedication (230.65 KB)

Introduction (102.54 KB)


  1. Cambrian-Ordovician Magmatism and Extension in New Mexico and Colorado,Nancy J. McMillan and Virginia T. McLemore, pp. 1-12.
  2. Space-Time Patterns of Late Cretaceous to Present Magmatism in New Mexico—Comparison With Andean Volcanism and Potential for Future Volcanism, Charles E. Chapin, Maureen Wilks, and William C. McIntosh, pp. 13-40.
  3. Denudation History and Internal Structure of the Front Range and Wet Mountains, Colorado, Based on Apatite-Fission-Track Thermochronology, Shari A. Kelley and Charles E. Chapin, pp. 41-78.
    [Table 1]
  4. Fault Geometry and Cenozoic Kinematic History of the Southeastern San Luis Basin Near Taos, New Mexico, Paul W. Bauer and Keith I. Kelson, pp. 79-96.
  5. Thrust Wedge Tectonics and Strike-Slip Faulting in the Sierra Nacimiento, New Mexico, Caleb J. Pollock, Kevin G. Stewart, James P. Hibbard, Laura Wallace, and Ruben A. Giral, pp. 97-112.
    [Sheets: 1, 2, 3, 4]
  6. The Anatomy of a Long-Lived Fault System—Structural and Thermochronologic Evidence for Laramide to Quaternary Activity on the Tijeras Fault, New Mexico, John C. Abbott, Laurel B. Goodwin, Shari A. Kelley, Stephen R. Maynard, and Wiliam C. McIntosh, pp. 113-138.
    [Appendices: 1, 2]
  7. Structural and Thermochronological Constraints on the Movement History of the Montosa Fault, New Mexico, Rose-Anna Behr, Laurel B. Goodwin, and Shari A. Kelley, pp. 139-160.
  8. The Hot Springs Fault System of South-Central New Mexico—Evidence for the Northward Translation of the Colorado Plateau During the Laramide Orogeny, Richard W. Harrison and Steven M. Cather, pp. 161-180.
  9. Laramide Minor Faulting in the Colorado Front Range, Eric A. Erslev, Steven M. Holdaway, Stephanie A. O'Meara, Branislav Jurista, and Bjorn Selvig, pp. 181-204.
    [Appendix 1]
  10. Geochronology of the Central Colorado Volcanic Field, William C. McIntosh and Charles E. Chapin, pp. 205-238.
    [Appendices: 1, 2, 3, 4, 5 ,6]
  11. Age of Mineralization in the Luis Lopez Manganese District, Socorro County, New Mexico, As Determined by 40Ar/39Ar Dating of Cryptomelane, Virgil W. Lueth, Richard M. Chamberlin, and Lisa Peters, pp. 239-250.
  12. 40Ar/39Ar Geochronology and Eruptive History of the Eastern Sector of the Oligocene Socorro Caldera, Central Rio Grande Rift, New Mexico, Richard M. Chamberlin, William C. McIntosh, and Ted L. Eggleston, pp. 251-280.
    [Appendices: 1, 2, 3, 4, 5, 6]
  13. Identification and Correlation of Oligocene Ignimbrites in Well Bores, Alamosa Basin (Northern San Luis Basin), Colorado, By Single-Crystal Laser-Fusion 40Ar/39Ar Geochronology of Well Cuttings, Brian S. Brister and William C. McIntosh, pp. 281-296.
  14. 40Ar/39Ar Geochronology of the Ocate Volcanic Field, North-Central New Mexico, Brian W. Olmsted and William C. McIntosh, pp. 297-308.
    [Appendices: 1, 2, 3, 4]
  15. Cosmogenic 36Cl Ages of Lava Flows in the Zuni-Bandera Volcanic Field, North-Central New Mexico, U.S.A., Nelia W. Dunbar and Fred M. Phillips, pp. 309-317.