Characteristics of siliciclastic rocks in Talladega belts--Blue Ridge belt successor basins

Conference · Mon Mar 01 04:00:00 EST 1993 · Geological Society of America, Abstracts with Programs; (United States)

OSTI ID:6111583

Tull, J F; Groszos, M S; Thompson, T W ^[1]

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1. Florida State Univ., Tallahassee, FL (United States). Dept. of Geology

Thick (2-3 km) metaclastic sequences lie unconformably above drift facies miogeoclinal rocks in the Talladega and western Blue Ridge belts. These Ordovician ( ) or younger sequences are deposited across tilted and broadly warped older strata in what appear to be fault-bounded extensional basins. The basin fill in general appears to be coarsening, thickening, and shallowing upward with metaturbidite sequences, including olistostromal lobes, dominating within the lower parts, and coarse metasandstone and conglomerate, and carbonaceous metapelite, capped by metachert units in the upper part. Facies trends within the successor basin are highly oblique to those below the major unconformity at the base of the sequence. Coarse clastic units are polymictic and contain clasts derived from both Grenville basement and a cover sequence containing a significant volume of carbonate rock. Fine-grained clastics also commonly contain appreciable carbonate, and siliceous marbles are present at a number of localities within the lower successor basin units. An abundance of feldspar and unstable rock fragments characterize coarse clastic units. These and other relationships indicate rapid erosion of and proximity to the source rocks which probably occurred along basin margin fault scarps.

• OSTI ID: 6111583
• 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

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
APPALACHIAN MOUNTAINS
DIMENSIONS
GEOLOGIC AGES
GEOLOGY
LITHOLOGY
MINERALOGY
MOUNTAINS
ORDOVICIAN PERIOD
PALEOZOIC ERA
PETROLOGY
ROCKS
SEDIMENTARY ROCKS
SEDIMENTATION
STRATIGRAPHY
THICKNESS