The Appalachian-Ouachita rifted margin of southeastern North America

Thomas, William A.

doi:10.1130/0016-7606(1991)103<0415:taormo>2.3.co;2

Cited by 277 publications

(228 citation statements)

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“…However, the Blue-Ridge Neoproterozoic successions do not con tain carbonates. They are unconformably overlain by the Early Cam brian Chilhowee Group, a trasgressive clastic succession representative of the transition from rift to passive margin following Rodinia (pannotia) break-up (Thomas, 1991).…”

Section: Implications For the Origin Of The Western Sierras Pampeanasmentioning

confidence: 99%

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Sr, C and O isotope geochemistry and stratigraphy of Precambrian and lower Paleozoic carbonate sequences from the Western Sierras Pampeanas of Argentina: tectonic implications

Galindo

Casquet

Rapela

et al. 2004

Precambrian Research

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Sr, C and 0 isotope data are presented for carbonate rocks from the Sierra de Pie de Palo and other crystalline outcrops of the Western Sierras Pampeanas. These are used to distinguish three groups of rocks of quite different ages within the nappe pile that constitutes the Sierra de Pie de Palo. Carbonates from the Grenville-age ophiolitic unit at the bottom of the pile probably resulted from the interaction between hot seawater and contemporaneous oceanic crust. These carbonates are tentatively classified as ophicalcites. Carbonates from the Difunta Correa Sedimentary Sequence are part of a cover sequence to a Grenvillian basement, together forming the upper nappes. Isotope stratigraphy suggests a middle to Late Neoproterozoic age (580-720 Ma) for these carbonates. This cover might be correlated with cover sequences to the Archean and Early to Middle Proterozoic cratons that are well preserved over large areas of Brazil. This fact, together with the apparently absence of an equivalent Neoproterozoic carbonate-bearing cover in the Appalachian margin of Laurentia, suggests that the Western Sierras Pampeanas, which are considered part of the exotic Argentine Precordillera terrane of allegedly Laurentian derivation. could be autochthonous or para-autochthonous to Gondwana. Other geochemical and geological arguments reinforce this hypothesis. The Caucete Group carbonates underlie the nappe pile and are separated from it by a first order thrust (the Pirquitas thrust). These latter carbonates are Cambrian in age and isotopic ally similar to the carbonate platform of the Precordillera. We thus conclude that the Pirquitas thrust is the boundary between the exotic Precordillera terrane and the autochthonous or para-autochthonous Western Sierras Pampeanas.

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Section: Implications For the Origin Of The Western Sierras Pampeanasmentioning

confidence: 99%

“…Two formations have long been distinguished: Mount Rogers and Catoctin (Thomas, 1991, and references therein; Thomas, personal com munication). They consist of volcanic rocks (basalt to rhy 0 lite ) and subordinated continental clastic sed iments.…”

Section: Implications For the Origin Of The Western Sierras Pampeanasmentioning

confidence: 99%

Sr, C and O isotope geochemistry and stratigraphy of Precambrian and lower Paleozoic carbonate sequences from the Western Sierras Pampeanas of Argentina: tectonic implications

Galindo

Casquet

Rapela

et al. 2004

Precambrian Research

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“…Typical Appalachian basement-involved structures are predominantly extensional faults, several of which may have resulted from Neoproterozoic to earliest Cambrian rifting of the eastern continental margin of North America (Rankin and others, 1989;Thomas, 1991). This rifting event was followed by the opening of the Iapetus Ocean and the construction of a passive margin along the eastern margin of North America (Rankin and others, 1989;Thomas, 1991).…”

Section: Structural Frameworkmentioning

confidence: 99%

“…Westward thickening of Paleozoic strata from the Cincinnati arch into the Illinois basin probably had multiple causes, one of which was extensional faulting of the basement and associated graben systems in western Kentucky and Illinois (Kolata and Nelson, 1997;Noger and Drahovzal, 2005). Subsidence was probably initiated during the Middle to Late Cambrian and persisted throughout most of the Paleozoic (Thomas, 1991;Kolata and Nelson, 1997).…”

Section: Stratigraphic Frameworkmentioning

confidence: 99%

“…This rifting event was followed by the opening of the Iapetus Ocean and the construction of a passive margin along the eastern margin of North America (Rankin and others, 1989;Thomas, 1991). A Middle Cambrian rifting event, which was more moderate in scale than the Neoproterozoic-earliest Cambrian rifting event, formed the Rome trough about 200 mi inland from the evolving passive margin (Beardsley and Cable, 1983;Read, 1989a,b;Shumaker, 1996).…”

Section: Structural Frameworkmentioning

confidence: 99%

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Geologic Cross Section I–I′ Through the Appalachian Basin from the Eastern Margin of the Illinois Basin, Jefferson County, Kentucky, to the Valley and Ridge Province, Scott County, Virginia

Ryder¹,

Trippi²,

Swezey³

2015

Scientific Investigations Map

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Long-lived deformation in the southern Mississippi Embayment revealed by high-resolution seismic reflection and sub-bottom profiler data

2015

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Three high-resolution seismic reflection profiles and two sub-bottom profiler sections acquired along the Mississippi River in southern-Central U.S. image deformation in post-Paleozoic sediments. The northernmost profile images two faults offsetting Cretaceous through at least Eocene Cane River reflectors, interpreted to strike northwest and to be part of the Arkansas River fault zone. The central profile shows a down-to-the-north fault, displacing Cretaceous and Paleocene Midway Group reflectors by~210 m and~160 m, respectively. The fault is interpreted as the northern edge fault of the Monroe Uplift, a Late Cretaceous uplift associated with igneous intrusions. The southernmost profile displays a down-to-the-south fault, offsetting Cretaceous and Paleocene-Eocene Wilcox Group reflectors by~125 m and~32 m, respectively. Tilted reflectors in the first 80 m indicate Eocene-Oligocene activity of the fault, although Quaternary activity cannot be ruled out. Quaternary tectonic activity is proposed for a series of faults that offset shallow (<40 m depth) Eocene sequences and the base of the Quaternary alluvium as imaged on two sub-bottom profiler sections. These shallow faults are imaged in the vicinity of Holocene earthquake-induced liquefaction fields, corroborating the evidence for recent tectonic activity in the area. The spatial coincidence of the imaged faults with the inferred location of the Alabama-Oklahoma transform strongly argues toward a long-lived influence of this Precambrian continental margin in focusing tectonic activity in the southern U.S. by controlling the reactivation of Triassic-Jurassic syn-rift basement structures and guiding the emplacement of Late Cretaceous igneous intrusions and the location of Cenozoic deformation.

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The Appalachian-Ouachita rifted margin of southeastern North America

Cited by 277 publications

References 0 publications

Sr, C and O isotope geochemistry and stratigraphy of Precambrian and lower Paleozoic carbonate sequences from the Western Sierras Pampeanas of Argentina: tectonic implications

Sr, C and O isotope geochemistry and stratigraphy of Precambrian and lower Paleozoic carbonate sequences from the Western Sierras Pampeanas of Argentina: tectonic implications

Geologic Cross Section I–I′ Through the Appalachian Basin from the Eastern Margin of the Illinois Basin, Jefferson County, Kentucky, to the Valley and Ridge Province, Scott County, Virginia

Long-lived deformation in the southern Mississippi Embayment revealed by high-resolution seismic reflection and sub-bottom profiler data

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