DETRITAL ZIRCON GEOCHRONOLOGY AND PROVENANCE OF MIDDLE AND UPPER DEVONIAN STRATA, NORTHERN APPALACHIAN BASIN OF NEW YORK STATE
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1 DETRITAL ZIRCON GEOCHRONOLOGY AND PROVENANCE OF MIDDLE AND UPPER DEVONIAN STRATA, NORTHERN APPALACHIAN BASIN OF NEW YORK STATE SELLECK, Bruce W. 1, CHIARENZELLI, Jeff 2, KRATZMANN, David J. 2, CHRISTOFFERSEN, Peter 2, and DURHAM, Ashley 2, (1) Department of Geology, Colgate University, 13 Oak Drive, Hamilton, NY 13346, (2) Department of Geology, St. Lawrence University, Canton, NY 13617
2 Basin Map Marcellus Subgroup outcrop belt sample localities modified after Steven Schimmrich hudsonvalleygeologist.blogspot.com
3 Hamilton Group Middle Devonian Upper Devonian sample localities arkosic Parkville, NY Slide Mtn. Fm. q f l petrology East Guilford, NY Oneonta Fm. Mastens Lake, NY Hamilton, NY (Chenango Mbr.) Bridgewater, NY (Solsville Mbr.) Wurtsboro, NY Mamakating, NY Mt. Marion Fm. Oatka Creek Union Springs Ashokan Fm. Marcellus Subgroup Onondaga Fm. Tristates Group Shawangunk Fm. Lower Devonian Silurian q f l Slide Mountain feldspathic Upper Hamilton Group, Oneonta lithic Marcellus Subgroup quartz-rich lithic quartz arenite
4 zircon images 20 mm spot Chenango Member, Skaneateles Fm., Hamilton Gp. Slide Mountain Formation
5 Chenango Member, Colgate Quarry 20 mm spot
6 Concordia Chenango Member, Skaneateles Formation, Hamilton Group, Colgate Quarry Probability-density
7 (from Tectonic Evolution of the Adirondack Mountains and Grenville Orogen Inliers within the USA, McLelland, et al, 2013)
8 Iapetus Rifting Appalachian Brasiliano/ Pan-African Grenville Zircon plots Graniterhyolite Trans-Hudson/ Penokean Superior Yavapi/ Mazatzal Shawangunk Formation (depositional age ~ 420 Ma) n=95
9 Hamilton Group Middle Devonian Upper Devonian n=105 Slide Mtn. Fm. Oneonta Fm. Ashokan Fm. n=95 Mt. Marion Fm. n=97 Oatka Creek Union Springs Marcellus Subgroup Onondaga Fm. Tristates Group Shawangunk Fm. Lower Devonian Silurian all zircons
10 Rigolet Ottawan Grenville Orogenic Cycle Shawinigan zircon plots Elsevirian Dysert- Mt. Holly (DMH) Shawangunk Formation (depositional age ~ 420 Ma) n=87
11 Hamilton Group Middle Devonian Upper Devonian Ottawan Shawinigan DMH Slide Mtn. Fm. Oneonta Fm. Ashokan Fm. Mt. Marion Fm. Oatka Creek Union Springs Marcellus Subgroup Onondaga Fm. Tristates Group Shawangunk Fm. Lower Devonian Silurian Rigolet Elsevirian DMH Mesoproterozoic zircons (likely, in part, recycled from C-O passive margin strata)
12 Hamilton Group Middle Devonian Upper Devonian Slide Mtn. Fm. Oneonta Fm. Ashokan Fm. Mt. Marion Fm. Oatka Creek Union Springs Marcellus Subgroup Onondaga Fm. Tristates Group Shawangunk Fm. Lower Devonian Silurian Rigolet Ottawan Shawinigan Elsevirian DMH Mesoproterozoic zircons (likely, in part, recycled from C-O passive margin strata)
13 Proterozoic zircons : older Proterozoic and Archean zircons may be recycled from Grenville metasedimentary sources additional recycling from early Paleozoic passive margin and foreland basin clastics, plus derivation from exposed basement Middle Devonian samples dominated by Grenville sources Oneonta Formation suite includes mid-continent sources Grenville zircon component relatively reduced in upper Devonian samples Variable Shawinigan vs. Dysert-Mt. Holly Grenville suites
14 Acadian Taconic Iapetus Rifting Ashokan Formation (depositional age ~ 370 Ma) n=17
15 Hamilton Group Middle Devonian Upper Devonian (375 Ma) n=30 Slide Mtn. Fm. Oneonta Fm. Ashokan Fm. Mt. Marion Fm. (376 Ma) (420 Ma) n=2 n=21 Oatka Creek Union Springs Marcellus Subgroup Onondaga Fm. Tristates Group Shawangunk Fm. Paleozoic zircons Lower Devonian Silurian Acadian Taconic
16 Hamilton Group Middle Devonian Upper Devonian (362 Ma) n=57 Slide Mtn. Fm. (366 Ma) n=34 Oneonta Fm. Ashokan Fm. (370 Ma) (373 Ma) n=21 n=19 Mt. Marion Fm. Union Springs Marcellus Subgroup Onondaga Fm. Tristates Group Shawangunk Fm. Lower Devonian Silurian Paleozoic zircons Acadian Taconic (376 Ma)
17 Paleozoic zircons: Taconic (~440 Ma) zircons dominate minor early Acadian ( Ma) zircons (volcanic?) in slightly younger strata minor contributions from Neoprot. and early Pal. (Iapetan rift, Brasiliano/PanAfrican) significant proportional increase in Taconic zircons in Upper Devonian samples correlates with increased coarse feldspar in sandstone unroofing of arc plutons and high-grade Taconic arc basement
18 Park, et al, Application of Foreland Basin Detrital Zircon Geochronology to the Reconstruction of the Southern and Central Appalachian Orogen.
19
20 Detrital zircons from Middle and Upper Devonian strata in the northern Appalachian Basin of New York State record the increasing importance of hinterland source regions during the Acadian Orogeny. Zircon suites from the Marcellus Subgroup (Mt. Marion and Oatka Creek Formations) and overlying Skaneateles and Ashokan Formations are dominated by Grenville Orogen ( Ma) with modest Taconic/early Acadian ( Ma) age clusters, plus Ma (Brasiliano/Pan-African, per Park, et al, 2010) and Ma (Yavapi/Mazatzal) populations. Zircons from Ma (Granite-rhyolite Province) and Ma (Trans-Hudson/Penokean Provinces) are also present. Superior Province ( Ma) zircons are a very minor component in all Devonian samples. Zircon suites from the Upper Devonian Oneonta Formation resemble the Middle Devonian suite, with a substantial Grenville population. The overlying Upper Devonian Slide Mountain Formation zircon suite is dominated by Taconic/Acadian zircons, with minor Grenville contributions. One zircon sample from the Silurian Shawangunk Formation is dominated by Grenville zircons. The age distributions and relative abundances of zircon age clusters from Middle and Upper Devonian strata are consistent with previously reported Nd model ages of Ma (Caesar, et al, 2010). The zircon data suggest that Marcellus Subgroup sediments accumulated during early phases of basin-filling, when cratonic and reworked passive margin sources were significant. Grenville zircon suites in the older strata are moderately biased toward younger Grenville ages (Ottawan Orogeny), perhaps indicating direct unroofing of Grenville basement during Marcellus deposition. The dominance of Taconic/Acadian zircons in the Upper Devonian Slide Mountain Formation reflects derivation from volcanic and plutonic rocks of the Acadian collisional margin. Coarse clastics of the Slide Mountain contain abundant monocrystalline potash feldspar, documenting exposure of granitic rocks in the source area.
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