Ordovician K-bentonites of eastern North America

Kolata, Dennis R.; Huff, Warren D.; Bergström, Stig M.

doi:10.1130/0-8137-2313-2.1

Cited by 43 publications

(32 citation statements)

References 104 publications

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“…Conceivably, the Mohawkian K-bentonites of interior Eastern North America (Kolata et al, 1996) are distant relatives. Although the felsic to locally mafic Highlandcroft and Oliverian plutons suggest a continental arc setting, the tholeiitic basalts of the Quimby sequence (the upper Ammonoosuc and Partridge of Schumacher, 1988;Hollocher, 1993) in Massachusetts might be interpreted to have been mantle-derived magmas that penetrated broken the Grenvillian continental lithosphere.…”

Section: Speculative Accretionary and Interaccretionary Eventsmentioning

confidence: 99%

Stratigraphy, geochronology, and accretionary terrane settings of two Bronson Hill arc sequences, northern New England

Moench¹,

Aleinikoff²

2003

Physics and Chemistry of the Earth, Parts A/B/C

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The Ammonoosuc sequence is defined by the Middle Ordovician Ammonoosuc Volcanics near Littleton, NH, the type area, northeast to Milan, NH, and Oquossoc, ME; it also includes black slate of the Partridge Formation (C. bicornis--zone graptolites, $457 Ma). Related metamorphosed intrusives are the tonalitic Joslin Turn pluton (469 AE 2 Ma), the Cambridge Black granitic pluton (468 AE 3 Ma), and gabbro, tonalite (467 AE 4 Ma), and sheeted diabase of the Chickwolnepy intrusions. These intrusives cut lowermost Ammonoosuc (therefore >469 Ma). Probable uppermost Ammonoosuc is dated at 465 AE 6 and 461 AE 8 Ma. Successively below the Ammonoosuc are the Dead River and Hurricane Mountain Formations (flysch and melange), and the Jim Pond Formation (484 AE 5 Ma) and Boil Mountain Complex (both ophiolite), which are structurally underlain by the Neoproterozoic(?) Chain Lakes massif.The Quimby sequence is defined by the Lower Silurian(?) to Upper Ordovician Quimby Formation, composed of bimodal volcanics (443 AE 4 Ma) and sulfidic shale and graywacke that lie conformably to unconformably above the Ammmonoosuc Volcanics and Partridge Formation. Also in the Quimby sequence are several granitic to sparsely gabbroic plutons of the Highlandcroft (441-452 Ma) and Oliverian (435-456 Ma) Plutonic Suites, which intrude the Dead River, Ammonoouc and Partridge, but not the Quimby Formation.Based on faunal, paleolatitude, and isotopic data, the Ammonoosuc sequence and its correlatives and underlying sequences formed off the southern Laurentian margin, but northwest of the principal Iapetan suture, or Red Indian line. The Boil MountainJim Pond-Hurricane Mountain sequence was ramped northwestward over the Chain Lakes massif at $475 Ma, on the basal Boil Mountain surface. This obduction probably occurred slightly before obduction on the Baie Vert-Brompton surface (BBL), farther NW, over the Laurentian margin, and was followed by Dead River flysch sedimentation, which ended with the abrupt onset of Ammonoosuc-sequence arc magmatism at $470 Ma. Ammonoosuc eruptions probably ended at $460 Ma, when Iapetus closed along the Red Indian line.During a following magmatic hiatus of $3-5 m.y., now represented by portions of the Partridge Formation that overlie the Ammonoosuc Volcanics, subduction polarity reversed, and subduction resumed below the northwest-dipping Brunswick subduction complex (BSC) of New Brunswick, Canada. Quimby-sequence magmatism ($456-435 Ma) on the newly accreted Laurentian margin occurred above the BSC, whose footwall is now buried to the southeast by mainly Silurian clastic sediments of the MerrimackFredericton trough, deposited in the ''Fredericton Sea''. In Silurian to Early Devonian time, the NW-dipping BSC footwall was paired with a SE-dipping subduction zone that produced arc magmas of the Coastal Volcanic belt, built on the composite Avalon and adjacent peri-Avalonian terranes. Orogen-normal extension produced by rapid rollback of both subduction zones narrowed the Fredericton Sea, produced the Central Maine and Connecti...

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Section: Speculative Accretionary and Interaccretionary Eventsmentioning

confidence: 99%

Stratigraphy, geochronology, and accretionary terrane settings of two Bronson Hill arc sequences, northern New England

Moench¹,

Aleinikoff²

2003

Physics and Chemistry of the Earth, Parts A/B/C

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“…The time-slice is marked by the Millbrig K-bentonite, a volcanic ash layer which has been correlated across eastern Laurentia (Kolata et al, 1996 and references therein). Samples consisting predominantly of micritic limestones (mudstones, wackestones, packstones) but also including grainstones, siltstones, and shales ( Fig.…”

Section: Geographic Variations In Dmentioning

confidence: 99%

Sensitivity of the epeiric sea carbon isotope record to local-scale carbon cycle processes: Tales from the Mohawkian Sea

Panchuk

Holmden

Kump

2005

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…These elemental signatures suggest that the parental magma originated from explosive volcanism of a volcanic-arc to syn-collisional setting (VAG-synCOLG). Based on research of similar claystones [8][9][10]12,[24][25][26][27][28], these claystone layers in the Tieling Formation are typical of K-bentonites that were altered from alkaline-intermediate to acidic, explosive, volcanic ash-falls due to devitrification and hydrolysis in sea water. At present, it is difficult to document the exact distribution trends of these bentonites, because the layers have thus far only been noted at three sections (Zhaojiashan, Laozhuanghu, Liujiagou; Figure 1).…”

Section: Geological Setting and Characteristics Of K-bentonites In Thmentioning

confidence: 99%

SHRIMP U-Pb dating for a K-bentonite bed in the Tieling Formation, North China

Huff

et al. 2010

Chin. Sci. Bull.

142

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Ordovician K-bentonites of eastern North America

Cited by 43 publications

References 104 publications

Stratigraphy, geochronology, and accretionary terrane settings of two Bronson Hill arc sequences, northern New England

Stratigraphy, geochronology, and accretionary terrane settings of two Bronson Hill arc sequences, northern New England

Sensitivity of the epeiric sea carbon isotope record to local-scale carbon cycle processes: Tales from the Mohawkian Sea

SHRIMP U-Pb dating for a K-bentonite bed in the Tieling Formation, North China

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