High-Resolution Surface and Subsurface Sequence Stratigraphy of Late Middle to Late Ordovician&amp;nbsp; (Late Mohawkian-Cincinnatian) Foreland Basin Rocks, Kentucky and Virginia

Pope, Mike; Read, J. Fred

doi:10.1306/3b05c654-172a-11d7-8645000102c1865d

Cited by 6 publications

(1 citation statement)

References 62 publications

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“…The earlier pulses of immature to submature coarse sands and gravels that predate the oldest red beds of the molasse and moved into the foredeep as submarine fan lobes and associated turbidity currents (e.g., the conglomerates at Cisco, Georgia, and South Holston Dam, Tennessee [33,56,84]) are populated almost exclusively with clasts of reworked Cambro-Ordovician carbonate rocks rather than with clasts of reworked siliciclastics that would and could have produced the quartz arenites associated with the K-bentonites. Those conglomerates are relatively rare, with by far most of the older strata in the Blount foredeep being turbidites associated with flysch deposition [84][85][86][87]. Likewise, younger strata which preserve evidence for a return to shelf carbonate conditions as the regionally widespread "Trenton" transgression occurred subsequent to cessation of molasse deposition are at many sections just a few meters upsection from the quartz arenites and the K-bentonites [54][55][56][88][89][90] The presence of mature to supermature quartz arenites in a foreland basin molasse sequence of otherwise submature to immature finer sands and muds is of interest in constraining temporal and spatial changes in provenance and paleodrainage systems during deposition of the molasse.…”

Section: Sedimentology Of Ordovician Arenites and Their Stratigraphic...mentioning

confidence: 99%

Testing Tectonostratigraphic Hypotheses of the Blountian Phase of the Taconic Orogeny in the Southern Appalachians through an Integrated Geochronological and Sedimentological Study of Ordovician K-Bentonites and Quartz Arenites

et al. 2023

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The tectonic setting of the southernmost part of the eastern margin of Laurentia during the Blountian tectophase (~472–452 Ma) of the Ordovician Taconic Orogeny remains unresolved. Tephras produced by explosive volcanism during this early phase of the orogeny are now K-bentonites, and in many locations, they are interbedded with mature to supermature quartz arenites. We conducted U-Pb analyses of detrital zircons from the sandstones, and of zoned magmatic zircons from the K-bentonites, to constrain the tectonostratigraphic setting with more precision. We also used geochemical fingerprinting of apatite phenocrysts to correlate the K-bentonites in these sandstones along the tectonic front, and we then integrated these results with a depositional systems study of the quartz arenites to further constrain and test competing models of the regional tectonomagmatic setting during that time. The general dearth of detrital zircons that have ages contemporaneous with the volcanic activity, coupled with the predominantly Precambrian ages of the zircons in these Lower Paleozoic quartz arenites that otherwise lack volcaniclastic components—such as detrital VRFs or a muddy matrix derived from an eroding volcanic arc—suggests that magmatic zircons from the tephra layers entered the depositional system only occasionally, and that the volcanic centers were separated geographically from where these quartzose sands were being deposited. Our findings support a tectonostratigraphic and tectonomagmatic model analogous to a combination of select modern settings in the western Pacific and Indonesia, specifically (1) New Guinea, where mature quartz arenites occur in the Cenozoic foreland succession, and (2) Sumatra, where the enormous Toba caldera formed in association with subduction beneath the Cretaceous-aged continental crust of Sumatra.

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Section: Sedimentology Of Ordovician Arenites and Their Stratigraphic...mentioning

confidence: 99%

Testing Tectonostratigraphic Hypotheses of the Blountian Phase of the Taconic Orogeny in the Southern Appalachians through an Integrated Geochronological and Sedimentological Study of Ordovician K-Bentonites and Quartz Arenites

et al. 2023

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Foreland-basin sequence response to collisional tectonism

Castle

2001

Geological Society of America Bulletin

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High-resolution sequence stratigraphy of the Upper Ordovician Montoya Group, southern New Mexico and western Texas: Outcrop analog of an unconventional chert and carbonate reservoir

Pope¹

2014

Bulletin

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The Upper Ordovician Montoya Group crops out in southern New Mexico and westernmost Texas and records predominantly subtidal deposition on a gently dipping carbonate ramp that was subsequently almost entirely dolomitized. The Montoya Group is a third-order composite sequence composed of six regionally correlative, shallowing-upward, third-order depositional sequences (M0-M5). Sequence M0 has sandstone at its base that is overlain by skeletal packstone-grainstone. Sequence M0 occurs only locally and was likely deposited in a topographic low formed during regional development of the unconformity following El Paso Group deposition. Sequence M1, marking the initial widespread transgression over the Ellenburger unconformity, consists of sandstone updip that passes downramp into skeletal packstone. The highstand systems tract (HST) of M1 consists of a prograding skeletal grainstone that was subaerially exposed upramp. Sequence M2, which contains the second-order maximum flooding surface, has abundant subtidal cherty carbonate at its base, which shallows upward into a widespread, prograding coral packstone-grainstone in the HST. Sequence M3 also contains abundant downramp chert that passes upramp into an aggrading crinoidal shoal and farther upramp into peritidal mudstone. Sequence M4 records an extensive basinward shift in facies as peritidal burrowed and cryptalgalaminated mudstone prograded over subtidal

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High-Resolution Surface and Subsurface Sequence Stratigraphy of Late Middle to Late Ordovician  (Late Mohawkian-Cincinnatian) Foreland Basin Rocks, Kentucky and Virginia

Cited by 6 publications

References 62 publications

Testing Tectonostratigraphic Hypotheses of the Blountian Phase of the Taconic Orogeny in the Southern Appalachians through an Integrated Geochronological and Sedimentological Study of Ordovician K-Bentonites and Quartz Arenites

Testing Tectonostratigraphic Hypotheses of the Blountian Phase of the Taconic Orogeny in the Southern Appalachians through an Integrated Geochronological and Sedimentological Study of Ordovician K-Bentonites and Quartz Arenites

Foreland-basin sequence response to collisional tectonism

High-resolution sequence stratigraphy of the Upper Ordovician Montoya Group, southern New Mexico and western Texas: Outcrop analog of an unconventional chert and carbonate reservoir

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