Paleostress and Geometric Analysis of the Southern Rio Grande Rift in the Northern Chihuahua Trough: Franklin and Potrillos Mountains as examples

Carciumaru, Dana; Ortega, Rodrigo Pérez

doi:10.18268/bsgm2017v69n3a9

Cited by 1 publication

(5 citation statements)

References 31 publications

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“…The oldest fault population in the East Potrillo Mountains formed during N -NE horizontal extension. This fault population is hypothesized to have formed during N-NE horizontal extension in the early Miocene (Carciumaru and Ortega, 2017) due to consistency with previously calculated directions of extension (Mack et al, 1994). It has been demonstrated, using kinematics data and fault slip analyses, that this fault population was formed in a different stress field than previously…”

Section: Carciumaru and Ortega 2017supporting

confidence: 83%

“…Existing fault kinematic data from the southern region of the rift is restricted to the Franklin and East Potrillo Mountains (Scharman, 2006;Carciumaru and Ortega, 2017). Data collected from the Franklin Mountains and East Potrillo Mountains focused on low-angle normal faults.…”

Section: Carciumaru and Ortega 2017mentioning

confidence: 99%

“…The fault kinematics and geometry imply that the formation of low-angle normal faults is consistent with two phases of extension. The first phase showed a N -NE extension direction followed by a second phase that involved E -W extension (Carciumaru and Ortega, 2017).…”

Section: Carciumaru and Ortega 2017mentioning

confidence: 99%

“…Very little fault kinematic data has been collected for the southern portion of the rift. Existing studies have focused on understanding the importance of scattered low-angle normal faults throughout southern New Mexico (Carciumaru and Ortega, 2017). Fault kinematic studies with the research objective of understanding patterns of extension in the southern rift are virtually non-existent.…”

mentioning

confidence: 99%

“…A flaw in this hypothesis is that similar faults have not been found throughout the region. For this reason, the reactivation hypothesis is favored(Carciumaru and Ortega, 2017).…”

mentioning

confidence: 99%

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Fault Kinematics of the Southern Rio Grande Rift: Exploring the Possibility of Fault Reactivation

Gonzalez¹

2019

Geological Society of America Abstracts With Programs

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The region in and around the southern Rio Grande rift has experienced a long and complex tectonic history since the Precambrian era. In addition to recording extension directions due to the opening of the Rio Grande rift, faults can also possibly record contractional deformation related to the Laramide orogeny, extension along the boundary of the Mesozoic Chihuahua Trough, and possibly strike-slip movement since the Precambrian related to the Texas Lineament. The northern and central segments of the Rio Grande rift preserve mostly N-S-trending faults, whereas the southern segment preserves NW-SE-trending faults. The main hypothesis to test is that although both fault sets were active during extension of the rift, the NW-SE trending faults may preserve evidence for underlying reactivated older faults, possibly dating back to the Precambrian. Using exposed faults in the southern rift, a paleostrain analysis was performed to determine maximum extension (S₁) and maximum shortening (S₃) directions. Fault kinematic data was collected from six mountain ranges in southern New Mexico and western Texas. Results support a model where the entire Rio Grande rift evolved within a general EWdirected extensional stress field. This resulted in extension along NS-trending dip-slip faults in the northern and central segments of the rift. In contrast, in the southern rift EW-directed extension may have been accomplished through reactivation of much older underlying structures in the crust, resulting in NW-trending dip-slip and oblique-slip faults. This observation could help explain the geometric "bend" in the Rio Grande rift as it continues south into Texas and northern Mexico. Further investigation of the kinematics is underway and is critical to understanding the importance of reactivation during continued extension within the southern Rio Grande rift. vi

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Section: Carciumaru and Ortega 2017supporting

confidence: 83%

Section: Carciumaru and Ortega 2017mentioning

confidence: 99%

Section: Carciumaru and Ortega 2017mentioning

confidence: 99%

mentioning

confidence: 99%

“…A flaw in this hypothesis is that similar faults have not been found throughout the region. For this reason, the reactivation hypothesis is favored(Carciumaru and Ortega, 2017).…”

mentioning

confidence: 99%

See 3 more Smart Citations

Fault Kinematics of the Southern Rio Grande Rift: Exploring the Possibility of Fault Reactivation

Gonzalez¹

2019

Geological Society of America Abstracts With Programs

View full text Add to dashboard Cite

show abstract

Paleostress and Geometric Analysis of the Southern Rio Grande Rift in the Northern Chihuahua Trough: Franklin and Potrillos Mountains as examples

Cited by 1 publication

References 31 publications

Fault Kinematics of the Southern Rio Grande Rift: Exploring the Possibility of Fault Reactivation

Fault Kinematics of the Southern Rio Grande Rift: Exploring the Possibility of Fault Reactivation

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