Tectonostratigraphic terranes and their Paleozoic boundaries in the central and southern Appalachians

U-Pb Zircon Ages and Pb Isotope Geochemistry of Gold Deposits in the Carolina Slate Belt of South Carolina

“…Ar-Ar geochronology and common Pb results (Ayuso et al, 1999) from the Brewer, Haile, and Ridgeway gold deposits are consistent with Paleozoic heating and isotopic disturbance (e.g., Horton et al, 1989), although they cannot be used to establish the ages of crystallization of the volcanic rocks or the gold mineralization. These estimates, as well as those using the whole-rock Rb-Sr (e.g., Butler and Secor, 1991, and references therein) and U-Th-Pb methods (LeHuray, 1987) are younger and less precise than zircon ages of volcanic rocks hosting the ore deposits reported here.…”

“…The slate belt extends from Georgia to Virginia and is part of the Carolina terrane ( Fig. 1), which constitutes a portion of the Carolina zone (e.g., Secor et al, 1983;Horton et al, 1989 recorded as early as the 1820s at the Haile and Brewer mines (Worthington, 1993). The gold deposits in the slate belt remained in production until the 1990s.…”

Terranes and overlap sequences in the Central and Southern Appalachians, an expanded explanation for part of the Circum-Atlantic terrane map

“…The Westminster terrane of Muller and others (1989) and Horton and others (1989a) was previously termed the Ijamsville-Pretty Boy-Octoraro terrane by Horton and Drake (1986).…”

“…Rocks from different tectonostratigraphic environments interpreted to be fragments in this terrane include the Piney Branch Complex (ophiolite fragment), Peters Creek Schist (high-energy submarine-fan ophiolitic melange), Piney Run Formation of Crowley (1976;ophiolitic melange), Annandale Group (suprafan deposit), and Wissahickon Formation, sensu stricto (turbidite-ophiolitic melange; Drake, 1986). From the Maryland-Pennsylvania border to northern Virginia, each thrust sheet is underlain by a precursory sedimentary melange characterized by olistoliths of the overlying thrust sheet (Drake, 1985b).…”

“…REFERENCES-Crowley (1976); Drake (1985aDrake ( , 1985bDrake ( , 1986Drake ( ,1987; Drake and Lyttle (1981); Drake and Morgan (1981); Hill (1987); Horton and others (1989a); Mose and Nagel (1982); Pavlides (1989) NA2h: SMITH RIVER TERRANE TERRANE BOUNDARIES~The Smith River terrane, as defined by Horton and others (1989a), lies in a fault-bounded synform within the Jefferson terrane just northwest of the Sauratown terrane. The Smith River terrane is bounded by the Ridgeway thrust fault, and locally by the younger Bowens Creek fault (Espenshade and others, 1975;Conley, 1988).…”