 |
| Titel |
Evolution of a highly dilatant fault zone in the grabens of Canyonlands National Park, Utah, USA – integrating fieldwork, ground-penetrating radar and airborne imagery analysis |
| VerfasserIn |
M. Kettermann, C. Grützner, H. W. van Gent, J. L. Urai, K. Reicherter, J. Mertens |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1869-9510
|
| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 3 ; Nr. 6, no. 3 (2015-07-21), S.839-855 |
| Datensatznummer |
250115498
|
| Publikation (Nr.) |
 copernicus.org/se-6-839-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| The grabens of Canyonlands National Park are a young and active system
of sub-parallel, arcuate grabens, whose evolution is the result of salt
movement in the subsurface and a slight regional tilt of the faulted strata.
We present results of ground-penetrating radar (GPR) surveys in combination with
field observations and analysis of high-resolution airborne imagery. GPR
data show intense faulting of the Quaternary sediments at the flat graben
floors, implying a more complex fault structure than visible at the surface.
Direct measurements of heave and throw at several locations to infer fault
dips at depth, combined with observations of primary joint surfaces in the
upper 100 m, suggest a highly dilatant fault geometry.
Sinkholes observed in the field as well as in airborne imagery give insights
in local dilatancy and show where water and sediments are
transported underground. Based on correlations of paleosols observed in
outcrops and GPR profiles, we argue that either the grabens in Canyonlands National
Park are older than previously assumed or that sedimentation rates
were much higher in the Pleistocene. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|