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Table of Contents - Special Paper 393

The Mojave-Sonora Megashear Hypothesis: Development, Assessment, and Alternatives

Edited by Thomas H. Anderson, Jonathan A. Nourse, James W. McKee, and Maureen B. Steiner

Preface		vii
Development
1.	The Mojave-Sonora megashear — Field and analytical studies leading to the conception and evolution of the hypothesis Thomas H. Anderson and Leon T. Silver	1
2.	Jurassic rocks in Sonora, Mexico: Relations to Mojave-Sonora megashear and its inferred northwestward extension Thomas H. Anderson, José Luis Rodríguez-Castañeda, and Leon T. Silver	51
3.	Pull-apart basins at releasing bends of the sinistral Late Jurassic Mojave-Sonora fault system Thomas H. Anderson and Jonathan A. Nourse	97
Assessment
4.	Contrasting Proterozoic basement complexes near the truncated margin of Laurentia, northwestern Sonora-Arizona international border region Jonathan A. Nourse, Wayne R. Premo, Alexander Iriondo, and Erin R. Stahl	123
5.	Paleoproterozoic Mojave province in northwestern Mexico? Isotopic and U-Pb zircon geochronologic studies of Precambrian and Cambrian crystalline and sedimentary rocks, Caborca, Sonora G. Lang Farmer, Samuel A. Bowring, Guadalupe Espinosa Maldonado, Christopher Fedo, and Joe Wooden	183
6.	The crust at northwestern Mexico interpreted from Magsat anomalies: Implications for existence of the Mojave-Sonora megashear J.O. Campos-Enríquez, E. Hernández-Quintero, and M. Lozada-Zumaeta	199
7.	Evidence for Mojave-Sonora megashear — Systematic left-lateral offset of Neoproterozoic to Lower Jurassic strata and facies, western United States and northwestern Mexico John H. Stewart	209
8.	Review of Upper Paleozoic and Lower Mesozoic stratigraphy and depositional environments, central and west Mexico: Constraints on terrane analysis and paleogeography Elena Centeno-García	233
9.	New data on the lithostratigraphy, detrital zircon and Nd isotope provenance, and paleogeographic setting of the El Antimonio Group, Sonora, Mexico Carlos M. González-León, George D. Stanley Jr., George E. Gehrels, and Elena Centeno-García	259
10.	Lower Mesozoic facies and crosscutting sequence boundaries: Constraints on displacement of the Caborca terrane John E. Marzolf and Thomas H. Anderson	283
11.	Possible Early Triassic location of the Caborca block Maureen B. Steiner, Oleg Pinos, Spencer G. Lucas, John E. Marzolf, and John W. Estep	309
12.	Middle Jurassic Topawa Group, Baboquivari Mountains, south-central Arizona: Volcanic and sedimentary record of deep basins within the Jurassic magmatic arc Gordon B. Haxel, James E. Wright, Nancy R. Riggs, Richard M. Tosdal, and Daniel J. May	329
13.	Climatic and tectonic controls on Jurassic intra-arc basins related to northward drift of North America Cathy J. Busby, Kari N. Bassett, Maureen B. Steiner, and Nancy R. Riggs	359
14.	Tectonic setting of the Glance Conglomerate along the Sawmill Canyon fault zone, southern Arizona: A sequence analysis of an intra-arc strike-slip basin Kari N. Bassett and Cathy J. Busby	377
15.	Pre–Late Jurassic fossil-bearing volcanic and sedimentary red beds of Huizachal Canyon, Tamaulipas, Mexico David E. Fastovsky, O. Don Hermes, Nicholas H. Strater, Samuel A. Bowring, James M. Clark, Marisol Montellano, and Rene Hernandez R.	401
16.	The Taray Formation: Jurassic (?) mélange in northern Mexico—Tectonic implications Thomas H. Anderson, Norris W. Jones, and James W. McKee	427
17.	Pangean reconstruction of the Yucatan block: Its Permian, Triassic, and Jurassic geologic and tectonic history Maureen B. Steiner	457
18.	Mesozoic basin formation, mass-gravity sedimentation, and inversion in northeastern Sonora and southeastern Arizona James W. McKee, Mary Beth McKee, and Thomas H. Anderson	481
19.	Reactivation of the San Marcos fault during mid-to-late Tertiary extension, Chihuahua, Mexico José Jorge Aranda-Gómez, Todd B. Housh, James F. Luhr, Christopher D. Henry, Tim Becker, and Gabriel Chávez-Cabello	509
20.	A reconstruction of late Miocene to Recent transtension in southwestern United States and northwesternmost Mexico John A. Dembosky Jr. and Thomas H. Anderson	523
Alternatives
21.	Tectonic synthesis of the Ouachita-Marathon-Sonora orogenic margin of southern Laurentia: Stratigraphic and structural implications for timing of deformational events and plate-tectonic model Forrest G. Poole, William J. Perry Jr., Raul J. Madrid, and Ricardo Amaya-Martínez	543
22.	A new reconstruction of the Paleozoic continental margin of southwestern North America: Implications for the nature and timing of continental truncation and the possible role of the Mojave-Sonora megashear Calvin H. Stevens, Paul Stone, and Jonathan S. Miller	597
23.	Chihuahua Trough — A Jurassic pull-apart basin Walter T. Haenggi and William R. Muehlberger	619
24.	Northward Laramide thrusting in the Quitovac region, northwestern Sonora, Mexico: Implications for juxtaposition of Paleoproterozoic basement blocks and the Mojave-Sonora megashear hypothesis Alexander Iriondo, Luis M. Martínez-Torres, Michael J. Kunk, William W. Atkinson Jr., Wayne R. Premo, and William C. McIntosh	631
25.	Isotopic provinces in Laramide and mid-Tertiary igneous rocks of northwestern Mexico (Chihuahua and Sonora) and their relation to basement configuration Todd B. Housh and Fred W. McDowell	671
Index		693