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Application of Foreland Basin Detrital-Zircon Geochronology To University of South Carolina Scholar Commons Faculty Publications Earth, Ocean and Environment, School of the 1-2010 Application of Foreland Basin Detrital-Zircon Geochronology to the Reconstruction of the Southern and Central Appalachian Orogen Hyunmee Park University of South Carolina David L. Barbeau Jr University of South Carolina - Columbia, [email protected] Alan Rickenbaker Denise Bachmann-Krug George E. Gehrels University of Arizona Follow this and additional works at: https://scholarcommons.sc.edu/geol_facpub Part of the Earth Sciences Commons Publication Info Published in The Journal of Geology, Volume 118, Issue 1, 2010, pages 23-44. Park, H., Barbeau Jr., D. L., Rickenbaker, A., Bachmann-Krug, D., & Gehrels, G. (2010). Application of foreland basin detrital-zircon geochronology to the reconstruction of the southern and central Appalachian Orogen. The Journal of Geology, 118 (1), 23-44. © The ourJ nal of Geology 2010, The nivU ersity of Chicago Press This Article is brought to you by the Earth, Ocean and Environment, School of the at Scholar Commons. It has been accepted for inclusion in Faculty Publications by an authorized administrator of Scholar Commons. For more information, please contact [email protected]. Application of Foreland Basin Detrital-Zircon Geochronology to the Reconstruction of the Southern and Central Appalachian Orogen Hyunmee Park, David L. Barbeau Jr., Alan Rickenbaker, Denise Bachmann-Krug, and George Gehrels1 Department of Earth and Ocean Sciences, University of South Carolina, Columbia, South Carolina 29208, U.S.A. (e-mail: [email protected]) ABSTRACT We report the U-Pb age distribution of detrital zircons collected from central and southern Appalachian foreland basin strata, which record changes of sediment provenance in response to the different phases of the Appalachian orogeny. Taconic clastic wedges have predominantly ca. 1080–1180 and ca. 1300–1500 Ma zircons, whereas Acadian clastic wedges contain abundant Paleozoic zircons and minor populations of 550–700 and 1900–2200 Ma zircons consistent with a Gondwanan affinity. Alleghanian clastic wedges contain large populations of ca. 980–1080 Ma and ca. 2700 Ma and older Archean zircons and fewer Paleozoic zircons than occur in the Acadian clastic wedges. The abundance of Paleozoic detrital zircons in Acadian clastic wedges indicates that the Acadian hinterland consisted of recycled material and Taconic-aged plutons, which provided significant detritus to the Acadian foreland basin. The appearance of Pan-African/Brasiliano- and Eburnean/Trans-Amazonian-aged zircons in Acadian clastic wedges suggests a Devonian accretion of the Carolina terrane. In contrast, the relative decrease in abundance of Paleozoic detrital zircons coupled with an increase of Archean and Grenville zircons in Alleghanian clastic wedges indicates the de- velopment of an orogenic hinterland consisting of deformed passive margin strata and Grenville basement. The younging-upward age progression in Grenville province sources revealed in Taconic through Alleghanian successions suggest a reverse unroofing sequence that indicates at least two cycles of Grenville zircon recycling. Online enhancements: appendix, supplementary material. Introduction Sediments derived from orogenic hinterlands and 1981; Gehrels et al. 1995; Fedo et al. 2003). Modern adjacent quiescent cratons accumulate in foreland techniques of U-Pb geochronology using laser ab- basins that develop in response to tectonic loading lation–multicollector–inductively coupled plasma- caused by subduction, continental collision, and/ mass spectrometry (LA-MC-ICP-MS) now allow or terrane accretion (Jordan 1995; DeCelles and rapid determination of ages (Black et al. 2004; Geh- Giles 1996). In the case of orogenic systems with rels et al. 2006). In this article, we use such data sufficiently diverse sediment sources, spatial and to address persistent questions relating to the tec- temporal variations in foreland basin sediment tonic development of the southern and central seg- provenance data can provide insight into the ki- ments of the Paleozoic Appalachian orogen. nematics of deformation, landscape evolution, and The Appalachian hinterland is partially com- sediment dispersal (Cawood and Nemchin 2001; posed of a complex mosaic of terranes that were McLennan et al. 2001). In recent years, U-Pb geo- amalgamated to the Laurentian margin during mul- chronology of individual detrital zircons has be- tiple phases of collision and related magmatism come one of the most useful approaches for iden- tifying sediment sources in basins (Gaudette et al. throughout Paleozoic time (fig. 1; Horton et al. 1989; Sinha et al. 1989; Hatcher 2005). Existing analyses of Appalachian detrital-zircon composi- Manuscript received May 15, 2009; accepted August 4, 2009. 1 Arizona LaserChron Center, Department of Geosciences, tions indicate that sediments derived from hinter- University of Arizona, Tucson, Arizona 85721, U.S.A. land accreted terranes are relatively minor in com- [The Journal of Geology, 2010, volume 118, p. 23–44] ᭧ 2010 by The University of Chicago. All rights reserved. 0022-1376/2010/11801-0002$15.00. DOI: 10.1086/648400 23 24 H. PARK ET AL. Figure 1. Simplified map of the Appalachian foreland basin and hinterland (modified from Millici and Witt 1988; Hatcher et al. 2004). parison to those originally derived from Grenville several of which remain poorly constrained or and related rocks that occur pervasively in the east- controversial. Here we report single-grain detrital- ern Laurentian subsurface (Eriksson et al. 2004; zircon U-Pb and Pb-Pb crystallization ages from 15 Thomas et al. 2004; Becker et al. 2005). Despite the samples of Upper Ordovician to Mississippian small sizes of these non-Grenville populations, sandstones collected along the central and southern such sediment should provide important data for Appalachians in Tennessee, West Virginia, Virginia, the evaluation of Appalachian tectonic models, and Pennsylvania. The age distribution of detrital Journal of Geology A P P A L A C H I A N S E D IMENT PROVENANCE 25 zircons from Pennsylvanian sandstones in the cen- well preserved in northern New York and involved tral and southern Appalachians are well established uplift and carbonate deposition upon the forebulge (e.g., Becker et al. 2005) and can be used to evaluate and the accumulation of black shales and turbidites the provenance evolution of the Appalachian fore- in the foredeep (Bradley 1989, 2008). In the hinter- land basin together with our Ordovician to Missis- land, the orogeny involved significant magmatic sippian samples. With these data, we examine the activity, penetrative deformation, and granulite- history of terrane accretion and kinematic evolu- facies and kyanite-grade metamorphism at ca. 465 tion of the central and southern Appalachians. Ma (Hatcher 1987; Drake et al. 1989; Bradley 2008). The accreted terranes responsible for this defor- mation and sediment accommodation presumably Geological Background included 450–470 Ma magmatic arcs preserved in The Appalachians are a 3,300-km-long orogen ex- the Milton, Tugaloo, Potomac, and Chopawamsic tending from Newfoundland to Alabama that terranes and ca. 530 Ma rocks of the Smith River formed through at least three Paleozoic orogenic Allochthon (fig. 1; Horton et al. 1989; Coler et al. events on the eastern margin of Laurentia (Wil- 2000; Hibbard et al. 2003). In the study area, the liams 1978; Bradley 2008). Today the Appalachians synorogenic clastic wedges associated with this Ta- consist of crystalline basement exhumed from the conic deformation are represented by the Martins- underlying Grenville province in addition to vari- burg Formation, the Oswego Sandstone, and the ably deformed and metamorphosed rift, passive Juniata Formation (fig. 2). margin, and foreland basin sedimentary rocks. Silurian to Early Devonian time in the Appala- These rocks record the development of the Lauren- chians was a period of orogenic quiescence between tian passive margin caused by breakup of the su- the Taconic and Acadian orogenies (Johnson et al. percontinent Rodinia and tectonic evolution as- 1985; Ettensohn 1991). During this time, Upper Si- sociated with opening and closing of Atlantic-realm lurian to Lower Devonian strata accumulated in ocean basins (fig. 2). The breakup of Rodinia is re- the Appalachian foreland basin and are character- corded in two pulses of magmatic activity, includ- ized by eustatically controlled sequences including ing a failed rifting event at ca. 700–760 Ma and the the Tuscarora Sandstone, the Rose Hill Formation, opening of the Iapetus Ocean at ca. 550–620 Ma and Keefer Sandstone of the Clinton Group; the (figs. 2, 3; Aleinikoff et al. 1995; Walsh and Alei- McKenzie Formation; the Helderberg Group; and nikoff 1999; Cawood et al. 2001). The first mag- the Oriskany Sandstone in West Virginia and Vir- matic activity is preserved in the Mt. Rogers and ginia (fig. 2; Johnson et al. 1985; Brett et al. 1990). Robertson River formations of the Blue Ridge and The Devonian to Early Mississippian Acadian is characterized by bimodal igneous activity in an orogeny is generally regarded as the result of the intracontinental rift system (fig. 3; Aleinikoff et al. collision of the Avalonian microcontinent to the 1995). Evidence of the younger 550–620 Ma rifting margin of eastern Laurentia in the northern Ap- event is widespread in the northern Appalachians palachians, and the accretion of the Carolina ter- including the Pound Ridge Granite and the
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