scholarly journals Evidence for a marine incursion along the lower Colorado River corridor

Geosphere ◽  
2014 ◽  
Vol 10 (5) ◽  
pp. 842-869 ◽  
Author(s):  
Kristin McDougall ◽  
Adriana Yanet Miranda Martínez
Keyword(s):  
Colorado River ◽  
River Corridor ◽  
Lower Colorado River

scholarly journals Post–12 Ma deformation in the lower Colorado River corridor, southwestern USA: Implications for diffuse transtension and the Bouse Formation

Geosphere ◽  
2019 ◽  
Vol 16 (1) ◽  
pp. 111-135
Author(s):  
Jacob O. Thacker ◽  
Karl E. Karlstrom ◽  
Laura J. Crossey ◽  
Ryan S. Crow ◽  
Colleen E. Cassidy ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Colorado River ◽  
San Andreas ◽  
History Of ◽  
Southwestern Usa ◽  
First Arrival ◽  
Metamorphic Core ◽  
East West ◽  
River Corridor ◽  
Lower Colorado River

Abstract Structural evidence presented here documents that deformation was ongoing within the lower Colorado River corridor (southwestern USA) during and after the latest Miocene Epoch, postdating large-magnitude extension and metamorphic core complex formation. Geometric and kinematic data collected on faults in key geologic units constrain the timing of deformation in relation to the age of the Bouse Formation, a unit that records the first arrival and integration of the Colorado River. North-south–striking extensional, NW-SE–striking oblique dextral, NE-SW–striking oblique sinistral, and east-west–striking contractional faults and related structures are observed to deform pre– (>6 Ma), syn– (6–4.8 Ma), and post–Bouse Formation (<4.8 Ma) strata. Fault displacements are typically at the centimeter to meter scale, and locally exhibit 10-m-scale displacements. Bouse Formation basalt carbonate locally exhibits outcrop-scale (tens of meters) syndepositional dips of 30°–90°, draped over and encrusted upon paleotopography, and has a basin-wide vertical distribution of as much as 500 m. We argue that part of this vertical distribution of Bouse Formation deposits represents syn- and post-Bouse deformation that enhanced north-south–trending depocenters due to combined tectonic and isostatic subsidence in a regional fault kinematic framework of east-west diffuse extension within an overall strain field of dextral transtension. Here we (1) characterize post-detachment tectonism within the corridor, (2) show that diffuse tectonism is cumulatively significant and likely modified original elevations of Bouse Formation outcrops, and (3) demonstrate that this tectonism may have played a role in the integration history of the lower Colorado River. We suggest a model whereby intracontinental transtension took place in a several hundred kilometers-wide area inboard of the San Andreas fault within a diffuse Pacific–North America plate margin since the latest Miocene.

scholarly journals ERRATUM: Post–12 Ma deformation in the lower Colorado River corridor, southwestern USA: Implications for diffuse transtension and the Bouse Formation

Geosphere ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 473-473
Author(s):  
Jacob O. Thacker ◽  
Karl E. Karlstrom ◽  
Laura J. Crossey ◽  
Ryan S. Crow ◽  
Colleen E. Cassidy ◽  
...  
Keyword(s):  
Colorado River ◽  
Southwestern Usa ◽  
River Corridor ◽  
Lower Colorado River

INNOVATION IN NEW GEOLOGIC MAPPING OF THE LOWER COLORADO RIVER CORRIDOR, SOUTHWEST USA

2017 ◽  
Author(s):  
P. Kyle House ◽  
◽  
Ryan S. Crow ◽  
Tracey J. Felger ◽  
L. Sue Beard ◽  
...  
Keyword(s):  
Colorado River ◽  
Geologic Mapping ◽  
Southwest Usa ◽  
River Corridor ◽  
Lower Colorado River

Tidal rhythmites in the southern Bouse Formation as evidence for post-Miocene uplift of the lower Colorado River corridor

Geology ◽  
2016 ◽  
Vol 45 (2) ◽  
pp. 99-102 ◽  
Author(s):  
Brennan O’Connell ◽  
Rebecca J. Dorsey ◽  
Eugene D. Humphreys
Keyword(s):  
Colorado River ◽  
River Corridor ◽  
Lower Colorado River
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