Map showing upper Cenozoic rocks and deposits and Quaternary faults, Rio Grande rift, south-central Colorado

10.3133/i1594 ◽  
1985 ◽  
Keyword(s):  
Rio Grande ◽  
Rio Grande Rift ◽  
South Central ◽  
Upper Cenozoic

Oligocene alkaline igneous activity in NE Mexico

1973 ◽  
Vol 110 (6) ◽  
pp. 551-555 ◽  
Author(s):  
K. Bloomfield ◽  
L. Cepeda-Davila
Keyword(s):  
New Mexico ◽  
Gulf Coast ◽  
Rio Grande ◽  
Rio Grande Rift ◽  
South Central ◽  
North Eastern ◽  
Igneous Activity ◽  
San Carlos ◽  
Alkaline Complexes ◽  
Age Determinations

SummaryPotassium-argon age determinations on rocks from the Sierra de San Carlos, State of Tamaulipas, México, which are petrographically very similar to other bodies in north-eastern México and the south-central U.S.A., indicate that a NW-trending zone of alkaline complexes, at least 1,400 km in length, stretches from the Gulf coast to southern New Mexico. This zone may be structurally related to the parallel, but somewhat younger, Rio Grande rift.

scholarly journals Identifying Buried Segments of Active Faults in the Northern Rio Grande Rift Using Aeromagnetic, LiDAR, and Gravity Data, South-Central Colorado, USA

2013 ◽  
Vol 2013 ◽  
pp. 1-26 ◽  
Author(s):  
V. J. S. Grauch ◽  
C. A. Ruleman
Keyword(s):  
Gravity Data ◽  
Active Faults ◽  
Rio Grande ◽  
Rio Grande Rift ◽  
Lidar Data ◽  
Aeromagnetic Data ◽  
Additional Information ◽  
South Central ◽  
Northern Rio Grande ◽  
Buried Faults

Combined interpretation of aeromagnetic and LiDAR data builds on the strength of the aeromagnetic method to locate normal faults with significant offset under cover and the strength of LiDAR interpretation to identify the age and sense of motion of faults. Each data set helps resolve ambiguities in interpreting the other. In addition, gravity data can be used to infer the sense of motion for totally buried faults inferred solely from aeromagnetic data. Combined interpretation to identify active faults at the northern end of the San Luis Basin of the northern Rio Grande rift has confirmed general aspects of previous geologic mapping but has also provided significant improvements. The interpretation revises and extends mapped fault traces, confirms tectonic versus fluvial origins of steep stream banks, and gains additional information on the nature of active and potentially active partially and totally buried faults. Detailed morphology of surfaces mapped from the LiDAR data helps constrain ages of the faults that displace the deposits. The aeromagnetic data provide additional information about their extents in between discontinuous scarps and suggest that several totally buried, potentially active faults are present on both sides of the valley.

Sign in / Sign up

Export Citation Format

Share Document