The Growth of Sheep Mountain Anticline: Comparison of Field Data and Numerical Modes
Abstract/Contents
- Abstract
- We study the vertical, compression parallel joint set that formed at Sheep Mountain Anticline during the early Laramide orogeny, prior to the associated folding event. Field data indicate that this joint set has a heterogeneous distribution over the fold. It is much less numerous in the forelimb than in the hinge and backlimb, and in fact is absent in many of the forelimb field measurement sites. Using 3D elastic numerical models, we show that early slip along an underlying thrust fault would have locally perturbed the surrounding stress field, inducing a compression that would inhibit joint formation above the fault tip. Relating the absence of joints in the forelimb to this stress perturbation, we are able to constrain the forelimb kinematics and, thus, the mode of folding. Accordingly, at Sheep Mountain, the forelimb was originally located in the hanging wall, above the upper tip of the thrust fault. We conclude that the fold developed with a fixed hinge, rotating limbs, and an internally deforming basement.
Description
| Type of resource | text |
|---|---|
| Date created | 2005 |
Creators/Contributors
| Author | Bellahsen, Nicolas | |
|---|---|---|
| Author | Fiore, Patricia E. |
Subjects
| Subject | field observations |
|---|---|
| Subject | 3D elastic numerical models |
| Subject | Sheep Mountain Anticline Wyoming |
| Subject | The Stanford Rock Fracture Project |
| Genre | Article |
Bibliographic information
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- This work is licensed under a Creative Commons Attribution 3.0 Unported license (CC BY).
Preferred citation
- Preferred Citation
- Bellahsen, Nicolas and Fiore, Patricia E. (2005). The Growth of Sheep Mountain Anticline: Comparison of Field Data and Numerical Modes. Stanford Digital Repository. Available at: http://purl.stanford.edu/yv876np7540
Collection
The Stanford Rock Fracture Project
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