Evidence for multiple recycling in Neoproterozoic through Pennsylvanian sedimentory rocks of the Central Appalachian Basin

Eriksson, K. A., Campbell, I. H., Palin, J. M., Allen, C. M. and Bock, Barbara (2004) Evidence for multiple recycling in Neoproterozoic through Pennsylvanian sedimentory rocks of the Central Appalachian Basin Journal of Geology, 112 (3). pp. 261-276. DOI 10.1086/382758.

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The petrography of sandstones and neodymium (Nd) isotope compositions of mudstones from the central Appalachians
indicate changing provenances during the late Neoproterozoic through Pennsylvanian evolution of easternNorth America.
In contrast, sandstones from all stratigraphic units are dominated by Grenvillian (950–1250 Ma) zircons. Neoproterozoic
to Cambrian rift-related sandstones are mostly feldspathic arenites and contain detrital zircons that are exclusively Grenvillian.
The associated mudstones have remarkably uniform initial Nd isotope compositions (� p�4.4 to �5.4 at the Nd
time of sedimentation) that also are consistent with a Grenville provenance. Cambrian passive margin sandstones are
quartz arenites that contain, in addition to Grenvillian zircons, significant numbers of early Mesoproterozoic and late
Paleoproterozoic (1300–1800 Ma) zircons. Intercalated mudstones have variable and low initial �Nd values of �6.3 to
�15.1 that, in common with the detrital zircons, indicate derivation from a mixture of Grenvillian and older crustal
provinces to the west. Sandstones from the overlying foreland basin clastic wedges typically are lithic arenites. Those
of Taconian age contain both sedimentary and metamorphic (polycrystalline quartz and chlorite schist) rock fragments,
whereas Acadian and Alleghanian sandstones are dominated by metamorphic rock fragments (quartz-muscovite and
quartz-chlorite schist, detrital mica, and polycrystalline quartz). Although detrital zircons are mainly Grenvillian, a few
younger (Taconian) zircons are present in the clastic wedge sandstones, and, significantly, a Lower Pennsylvanian sandstone
contains up to 10% Archean zircons of probable Superior Province heritage. Mudstones from theTaconian, Acadian,
and Alleghanian clastic wedges have uniform Nd isotopic compositions (initial � p�7.7 to �9.0) that are consistent Nd
with recycling of the lower part of the passive margin prism with an admixture of new, freshly eroded Grenville basement.
Sandstone petrography and detrital zircon geochronology indicate that Taconian-age sandstones and conglomerates were
recycled from older passive margin sedimentary rocks that were uplifted in an accretionary prism in front of the
approaching magmatic arc and that Acadian and Alleghanian sandstones were derived from deeper levels of this foldthrust
complex. The rarity of Neoproterozoic and Paleozoic zircons in the clastic wedge sandstones is attributed to the
presence of the accretionary prism as a tectonic highland between the magmatic arcs and the foreland basins.

Document Type: Article
Keywords: MUG
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
DOI etc.: 10.1086/382758
ISSN: 0022-1376
Date Deposited: 26 Jan 2009 12:22
Last Modified: 05 Dec 2016 11:27
URI: http://eprints.uni-kiel.de/id/eprint/6236

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