Alleghanian development of the Goat Rock fault zone, southernmost Appalachians: Temporal compatibility with the master decollement
Journal Article
·
· Geology; (United States)
- Auburn Univ., AL (United States)
- Univ. of North Carolina, Chapel Hill (United States)
- Columbus College, GA (United States)
- Geological Survey, Reston, VA (United States)
The Goat Rock and associated Bartletts Ferry fault zones, which mark the eastern margin of the Pine Mountain Grenville basement massif, are controversial due to the suggestion that they are rare exposed segments of the late Paleozoic southern Appalachian master decollement. The controversy in part stems from reported middle Paleozoic (Acadian) radiometric dates postulated as the time of movement along these fault zones. Ultramylonite samples from the type area at Goat Rock Dam yield a 287 [plus minus] 15 Ma Rb-Sr isochron interpreted as the time of Sr isotopic rehomgenization during mylonitization. This date is corroborated by Late Pennsylvanian-Early Permian [sup 40]Ar/[sup 39]Ar mineral ages on hornblende (297-288 Ma) and muscovite (285-278 Ma) from neomineralized and dynamically recrystallized rocks within and straddling the fault zone. These Late Pennsylvanian-Early Permian dates indicate the time of right-slip movement (Alleghenian) along the Goat Rock fault zone, which is compatible with the timing suggested by COCORP for thrusting along the southern Appalachian master decollement.
- OSTI ID:
- 6937700
- Journal Information:
- Geology; (United States), Journal Name: Geology; (United States) Vol. 20:9; ISSN 0091-7613; ISSN GLGYBA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sequential development of the Appalachian orogen above a master decollement: a hypothesis
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Journal Article
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Fri Nov 30 23:00:00 EST 1979
· Geology; (United States)
·
OSTI ID:6034849
Early jointing in coal and black shale: Evidence for an Appalachian-wide stress field as a prelude to the Alleghanian orogeny
Journal Article
·
Sat Jul 15 00:00:00 EDT 2006
· Geology
·
OSTI ID:20781487
Paleozoic synsedimentary structural deformation in Appalachian fold-thrust belt of Alabama and west Georgia
Conference
·
Thu May 01 00:00:00 EDT 1986
· Am. Assoc. Pet. Geol., Bull.; (United States)
·
OSTI ID:5376555
Related Subjects
58 GEOSCIENCES
580000* -- Geosciences
AGE ESTIMATION
ALABAMA
ALKALI METAL ISOTOPES
ALKALINE EARTH ISOTOPES
AMPHIBOLE
APPALACHIAN MOUNTAINS
ARGON ISOTOPES
CARBONIFEROUS PERIOD
DEVELOPED COUNTRIES
GEOLOGIC AGES
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC HISTORY
GEOLOGIC MODELS
GEOLOGIC STRUCTURES
GEORGIA
HORNBLENDE
ISOTOPE DATING
ISOTOPES
METAMORPHIC ROCKS
MICA
MINERALS
MOUNTAINS
MUSCOVITE
NORTH AMERICA
PALEOZOIC ERA
PERMIAN PERIOD
ROCKS
RUBIDIUM ISOTOPES
SILICATE MINERALS
STRONTIUM ISOTOPES
USA
580000* -- Geosciences
AGE ESTIMATION
ALABAMA
ALKALI METAL ISOTOPES
ALKALINE EARTH ISOTOPES
AMPHIBOLE
APPALACHIAN MOUNTAINS
ARGON ISOTOPES
CARBONIFEROUS PERIOD
DEVELOPED COUNTRIES
GEOLOGIC AGES
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC HISTORY
GEOLOGIC MODELS
GEOLOGIC STRUCTURES
GEORGIA
HORNBLENDE
ISOTOPE DATING
ISOTOPES
METAMORPHIC ROCKS
MICA
MINERALS
MOUNTAINS
MUSCOVITE
NORTH AMERICA
PALEOZOIC ERA
PERMIAN PERIOD
ROCKS
RUBIDIUM ISOTOPES
SILICATE MINERALS
STRONTIUM ISOTOPES
USA