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ity for reactivation. We propose that after tuffaceous sandstones of the Thurman Formation Hurd, O., and Zoback, M.D., 2012, Regional stress
(late Oligocene), Rio Grande rift, New Mexico
extension in the Basin and Range Province [M.S. thesis]: Socorro, New Mexico, New Mexico orientations and slip compatibility of earthquake
and Rio Grande rift ceases, this boundary Institute of Mining and Technology, 82 p. focal planes in the New Madrid Seismic Zone:
will persist as a stable feature of North Buck, W.R., 1991, Modes of continental lithospher- Seismological Research Letters, v. 83, p. 672–
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ACKNOWLEDGMENTS Mexico: New Mexico Bureau of Mines and Min- grain and mantle modification events: Rocky
We thank John Singleton, an anonymous review- eral Resources Circular, v. 169, 32 p. Mountain Geology, v. 33, p. 161–179, https://doi
er, and science editor Mihai Ducea for comments that Corti, G., 2009, Continental rift evolution: From .org/10.2113/33.2.161.
helped strengthen the arguments made in this paper. initiation to incipient break-up in the Main Karlstrom, K.E., Amato, J.M., Williams, M.L.,
Becky Flowers and Jim Metcalf at the University of Ethiopian Rift, East Africa: Earth-Science Heizler, M., Shaw, C.A., Read, A.S., and Bauer,
Colorado TRaIL lab in Boulder, Colorado, USA, Reviews, v. 96, p. 1–53, https://doi.org/10.1016/ P., 2004, Proterozoic tectonic evolution of the
helped acquire (U-Th)/He data. This work is sup- j.earscirev.2009.06.005. New Mexico region: A synthesis, in Mack, G.H.,
ported by NSF grants EAR-1624538 to Ricketts and Davy, P., Guérin, G., and Brun, J.-P., 1989, Thermal and Giles, K.A., eds., The Geology of New Mex-
EAR-1624575 to Amato. constraints on the tectonic evolution of a meta- ico: A Geologic History: New Mexico Geologic
morphic core complex (Santa Catalina Moun- Society, Special Publication 11, p. 1–34.
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