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- W253671037 abstract "Sandstones in the Taconic, Acadian and Alleghanian clastic wedges in the Appalachian Orogenic Belt provide evidence for changing provenances during the late Ordovician through pennsylvanian, Neoproterozoic-Early Cambrian, synrift sandstones are predominantly feldspathic arenites, whereas quartz arenites typify sandstones in the Cambrian passive-margin prism. In contrast, sandstones in the overlying foreland-basin clastic wedges typically are lithic arenites and occupy the quartzose to lithic recycled fields on QmFLt diagrams. Mid-Ordovician lithic arenites (Knobs, Bays Fms.) are dominated by a variety of sedimentary rock fragments including feldspathic and quartz arenites, limestone, dolomite and chert. Conglomerates in the Bays Formation similarly are dominated by recycled sedimentary clasts; gneiss clasts are only rarely observed. Above a regional unconformity in the middle Tuscarora formation, a succession of quartz arenites (upper Tuscarora, Rose Hill and Eagle Rock Fms.) developed in response to prolonged reworking. Overlying lithic arenites (Middle Devonian-Pennsylvanian) contain a variety of metamorphic rock fragments including quartz-mica schist, strained and polycrystalline quartz, and detrital mica. Sandstone petrography and clast compositions thus indicate that the Taconic orogeny involved uplift of the older passive-margin prism in a fold-and-thrust belt or accretionary prism. Coarse-grained sedimentary rocks provide no evidence of an arc to the east. Mature Silurian sandstones recordmore » an inter-orogenic, quiescent phase of the Appalachian Orogeny.« less" @default.
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- W253671037 date "1994-03-01" @default.
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- W253671037 title "Provenance characterization of Appalachian clastic wedges from sandstone petrography and clast compositions" @default.
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