Down to the southeast kinematic indicators associated with the Goat Rock fault and gneisses to the south
Conference
·
· Geological Society of America, Abstracts with Programs; (United States)
OSTI ID:6078823
- Columbus Coll., GA (United States). Dept. of Chemistry and Geology
- Auburn Univ., AL (United States). Dept. of Geology
Right slip movement has long been recognized as the dominant movement sense along the Goat Rock fault zone (GRfz). However, down to the southeast displacements have been reported based on megascopic south-verging folds of GRfz blastomylonite and a listric normal fault and its associated secondary structures (e.g., SE directed folds and top to the E directed shears) that deform gneiss in the hanging wall block. Microscopic observations of GRfz blastomylonites that document top to the southeast normal movement include mica fish, folded mica porphyroclasts and deformation bands that extend the dominant mylonitic foliation. In hanging wall gneisses, biotite schist patches with a dip-slip lineation contain mica fish and slip-cleavage of feldspar also indicating top to the southeast normal displacement. Deformational conditions for the GRfz span a broad range from high T shear zones to very late stage retrogressive zones, the latter of which deform the right-slip mylonitic fabric reported to have formed between approximately 292 and 276 m.y. ago. They may represent minor antithetic adjustments in a thrust sheet during emplacement, extensional features related to gravitational collapse on the flanks of a growing basement-cored arch (the Pine Mountain arch to the northwest) or they be an early effect of Mesozoic rifting.
- OSTI ID:
- 6078823
- Report Number(s):
- CONF-9304188--
- Conference Information:
- Journal Name: Geological Society of America, Abstracts with Programs; (United States) Journal Volume: 25:4
- Country of Publication:
- United States
- Language:
- English
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