Rotation of fold axes during southerly directed thrusting, Broken Bow Uplift, Ouachita Mountains of Oklahoma
Conference
·
· Geological Society of America, Abstracts with Programs; (United States)
OSTI ID:5932830
- Univ. of Texas, Dallas, TX (United States)
The Broken Bow Uplift has been subdivided into four large structures: Hochatown dome, Carter Mountain anticlinorium, Linson Creek synclinorium, and Cross Mountain anticlinorium. Detailed geological mapping of lower Paleozoic units in the western portion of Carter Mountain anticlinorium has revealed three fault zones from north to south: North Bee Creek fault zone (NBCFZ), South Carter Creek fault zone (SCCFZ), and Dyer Mountain fault zone (DMFZ). These fault zones separate two anticlines: Carter Mountain anticline and Brigham anticline. DMFZ is the tectonic contact between the Carter Mountain Anticlinorium and Hochatown dome to the south. The earliest folds in Hochatown dome are overturned, tight to isoclinal, subhorizontal with planar limbs and sharp hinges that trend east-west. The Carter Mountain and Brigham anticlines are interpreted to be associated with these earliest folds. As DMFZ is approached from Hochatown dome, fold axes plunge 15--20[degree] to WNW. The folds within the fault zones have been significantly rotated and plunge at 30--55[degree] to northwest or north. Within the South Carter Creek fault zone, a horse block is developed around a thick folded sequence of Arkansas Novaculite with fold hinge trending 350[degree]/50[degree]. The fold axes data clearly show concentration trending in northwest direction. However there is a scatter of data with orientations trending due north as well as to northeast. A model of earlier fold axes rotation as a result of simple shear associated with inferred southerly directed thrusting has been proposed to explain the geometric relationship described above. The best fit great circle for the rotated fold axis data has an orientation of 95[degree]/55[degree]N. This calculated plane represents the plane of flattening associated with the southerly directed thrusting.
- OSTI ID:
- 5932830
- Report Number(s):
- CONF-9303212--
- Conference Information:
- Journal Name: Geological Society of America, Abstracts with Programs; (United States) Journal Volume: 25:1
- Country of Publication:
- United States
- Language:
- English
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