17.07.2021 | History

3 edition of Appalachian thrust belt in Alabama found in the catalog.

Appalachian thrust belt in Alabama

tectonics and sedimentation ; 95th annual meeting of the Geological society of America, New Orleans, Louisiana October 21-23 ; 1982

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Published by Administrator in Alabama Geological Society

    Places:
  • United States
    • Subjects:
    • Alabama Geological Society


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      • Guidebook for field trip no. 12, October 21-23, 1982.Bibliogr.1

        StatementAlabama Geological Society
        PublishersAlabama Geological Society
        Classifications
        LC Classifications1982
        The Physical Object
        Paginationxvi, 110 p. :
        Number of Pages43
        ID Numbers
        ISBN 10nodata
        Series
        1nodata
        2
        3

        nodata File Size: 1MB.


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Appalachian thrust belt in Alabama by Alabama Geological Society Download PDF EPUB FB2


William A. Thomas

Weathering and erosion prevailed, and the mountains began to wear away. A—Sections from the Marathon embayment including a list of Mississippian-Pennsylvanian formations in the Marathon synorogenic clastic wedgeTexas promontory, Appalachian thrust belt in Alabama Southern Oklahoma intracratonic fault system; chart compiled from data in ; ; ; Denison, in; ; and ; and correlations from ; ; and.

The age of the Ouachita rift is documented by the 530—539 Ma synrift volcanics of the Southern Oklahoma fault system, by Early Cambrian synrift sediment along the conjugate rift margin in the Argentine Precordillera, and by late synrift graben-fill of Early to early Late Cambrian age in the Mississippi Valley and Birmingham graben systems.

A transgressive passive-margin succession of Appalachian thrust belt in Alabama sandstone and overlying shallow-marine carbonates overlaps the Cambrian igneous rocksand the age of the base of the transgressive succession is middle Late Cambrian Denison, in.

With continued thermal subsidence or sea-level risea carbonate buildup at the shelf edge maintained a steep seaward-facing slope, where submarine canyons cut through the Late Cambrian—Ordovician shelf carbonates and underlying basement to supply clasts to the Upper Cambrian and Ordovician deep-water deposits.

The Adirondack and New England Provinces include sedimentary, metasedimentary, and plutonic igneous rocks, mainly of Cambrian and Ordovician age, similar lithologically to rocks in the Blue Ridge and Piedmont Provinces to the south.

The initial transgressive passive-margin carbonate-shelf deposits, overlying Precambrian basement, around the Texas promontory are of late Middle Cambrian age summary in ; and the oldest off-shelf facies in the Marathon allochthon are of Late Cambrian age.

This article incorporates from the document: Leslie F.2015, Detrital-zircon geochronology and provenance of the Ocloyic synorogenic clastic wedge, and Ordovician accretion of the Argentine Precordillera terrane: Geosphere, v. Because the allochthon contains exclusively off-shelf passive-margin facies and is thrust over the passive-margin shelf facies, the regional detachment must cut through the shelf edge somewhere beneath the allochthon.

Significantly, the boulders contain fossils of shallow-water forms in contrast to the deeper water graptolite faunas of the interbedded shales; however, the biostratigraphic ages are indistinguishable.

Mushwad: Ductile Duplex in the Appalachian Thrust Belt in Alabama

1989, Middle Cambrian to Lower Mississippian synsedimentary structures in the Appalachian fold- thrust belt in Alabama and Georgia:. Lithologic similarities include red mud-cracked sandstones, Salterella-bearing limestones, and evaporites. The Appalachian Basin has had a long history of oil and gas production. Locations of Ouachita-Appalachian basement uplifts thrust-ramp anticlines are shown by abbreviations in blue letters: DR—Devils River uplift; Lu—Luling uplift; Wa—Waco uplift; BB—Broken Bow uplift; Bt—Benton uplift; and PM—Pine Mountain internal basement massif.

These mountain ranges likely once reached elevations similar to those of the and the before they were eroded. Prominent linear gravity highs define three intersecting arms, each reflecting a different source: a relatively short, northeast-trending arm along the Broken Bow basement uplift; a northwest-trending arm, extending into the continent along the mafic igneous rocks of the Southern Oklahoma fault system; and a south-southwest trending arm, extending along the subsurface interior zone Appalachian thrust belt in Alabama the Ouachita orogen in east Texas and curving abruptly to the northwest around the corner of the Texas promontory.

The geometry and composition indicate crust-penetrating near-vertical fractures as magma conduits, consistent with a leaky transform fault.

TEXAS TRANSFORM FAULT South of the Llano uplift beneath the cover of the Gulf Coastal Plain, the trace of the Ouachita thrust belt bends from south-southwest to west-northwest and extends in that direction in the subsurface across south Texas to the exposed thrust belt in the Marathon region of west Texas.

With the creation of this newthe early Appalachians were born. Palinspastic restoration minimum restoration, using line-length and area balancing of thrust sheets Appalachian thrust belt in Alabama the sedimentary thrust belt places the trailing thrust sheets approximately at the present location of the Pine Mountain internal basement massif, showing that the early Paleozoic passive-margin carbonate-shelf succession now imbricated in the thrust belt covered all of the area of shallow crystalline basement rocks now beneath the thrust belt and Piedmont metamorphic terranes.

Correlation chart comparing a stratigraphic section from the Argentine Precordillera terrane with a section on the conjugate rift margin on the Texas promontory and a section on the Alabama promontory.