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Acadian orogeny

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551: 462: 389:, new faults formed, while older faults were reactivated. Acadian deformation and metamorphism were asymmetric across the strike of the orogen. The Acadian plutons intruded every belt, unlike the deformation/metamorphism, of Avalonia which did not undergo much of the alteration shown in other localities. During the Middle Devonian, centers for volcanoes and uplift formed in the New England region and shed fine-grained 103: 656: 366: 436:
The second tectophase, during the Middle Devonian, represents the collision with the New York promontory. The southward migration of deformation reflected the third tectophase, which marks the collision of Avalon terranes with the Virginia promontory in the Middle to Late Devonian time. The effects
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The Appalachian basin, during the Middle Devonian and Early Mississippian, is characterized by large volumes of deltaic sedimentary rocks that were deposited in the Acadian foreland basin as a response to the Acadian orogeny. These deposits extend from central New York and Pennsylvania westward to
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limestone. The strata was deposited in a four-stage pattern that is observed in each tectophase. The formation of the foreland basin through rapid subsidence initiated transgressive sequences that deposited basinal black shales. After the black shales were deposited, the migration of deformation
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silty shales and carbonates. These deposits reflect small transgressive-regressive cycles in a delta-front and delta platform environments. The third stage is represented by regional uplift, which accompanied the collision of an Avalon terrane with a promontory, and subsequently, developed a
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As the migration of deformation continued southward along the fault zone, during the Early Mississippian time, the final collision occurred with the Alabama promontory . Ettensohn refers to the fourth tectophase as the Mississippian tectophase of the Acadian orogeny, since it demonstrated an
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The Catskill Delta complex consists of a coarsening upward sequence of rocks. Its thickness is greatest in eastern Pennsylvania and thins westward into Ohio. The Catskill paleogeography appears to consist of many small streams, which deposited their sedimentary load along a coastal
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delta of Late Devonian and Early Mississippian age. The Acadian delta complex is coupled to the four tectophases of the Acadian orogeny, both in terms of provenance and depositional settings. The relief resulting from the orogeny was the fundamental source of the delta sediments.
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The collision between Laurentia and Avalonian terranes is actually more complex than described above. The collision is broken into three or possibly four tectophases which represent a successive collision of the Avalonian terranes with eastern Laurentia.
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developed on the adjacent parts of the stable craton, eastern margin of Laurentia. These deltas are described as foreland-basin, delta-complex clastic wedges, which are responsible for the large volumes of sediment input into the Appalachian basin.
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adjustment to the load by the lithosphere. Once thrust propagation declines, substantial relief and drainage nets have had time to develop, and the as a resulting coarser clastic sediment is eroded and transported to the foreland basin.
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Ohio, and south along the Appalachian Mountains through Virginia and Tennessee to Alabama. The Acadian delta complex is categorized into two deltas, the Catskill Delta of Middle and Upper Devonian age, and the Price-Rockwell in the
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age arc rocks and is believed to come from the margin of Gondwana, sometime in the Early Ordovician. Avalonia rifted from Gondwana during the onset of igneous activity in the Ardennes, Wales, and southeast Ireland that consumed the
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continent. Geographically, the Acadian orogeny extended from the Canadian Maritime provinces migrating in a southwesterly direction toward Alabama. However, the northern Appalachian region, from New England northeastward into
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which represents the zone of convergence between Laurussia/Laurentia and Avalon terranes. One or more of the Avalonian terranes accreted with the eastern margin of Laurentia, most likely beginning in the late Early Devonian.
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Lash, Gary, G.; Engelder, Terry (January 2011). "Thickness trends and sequence stratigraphy of the Middle Devonian Marcellus Formation, Appalachian Basin: Implications for Acadian foreland basin evolution".
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continued southward, and regression dominated, particularly on the east side of the basin. As collision intensified, subsidence in the foreland basin declined, and sedimentation was replaced by an influx of
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Van Der Voo, Rob (March 1988). "Paleozoic paleogeography of North America, Gondwana, and intervening displaced terranes: Comparisons of paleomagnetism with paleoclimatology and biogeographical patterns".
224:. During the Ordovician-Devonian time, Laurentia remained at the same paleolatitude, slightly south of the equator in the southern hemisphere, with relatively the same paleolongitude. Major defining 337:
The evidence for the Acadian orogeny is abundant and widespread in the northern Appalachians, recorded by the plutonism and the migration of the northern Appalachian deformation front toward the
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are recognized. These phases are called tectophases and represent the sequence of collisions that occurred from the Avalonian terranes accreting to Laurentia. As a result of these tectophases,
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Geologic cross section E-E' through the central Appalachian Basin from the Findlay Arch, Wood County, Ohio, to the Valley and Ridge Province, Pendleton County, West Virginia
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Ettensohn, Frank R.; Brett, Carlton E. (2002). "Stratigraphic evidence from the Appalachian Basin for continuation of the Taconian orogeny into Early Silurian time".
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belts along the eastern margin of North America. One belt occurs in Newfoundland; another forms the bedrock of much of the coastal region of New England from eastern
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to Middle Ordovician drift sequence during the opening of the Iapetus Ocean, the Appalachian accretionary events to the eastern continental margin, and the resulting
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of the foreland, which generates a localized unconformity. The distributions of unconformities display an asymmetric pattern in relation to the promontories.
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into an inland seaway that covered a large part of southern and central Appalachia. Today, portions of the ancient Avalonia landmass occur in scattered
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Ettensohn, Frank R. (July 1987). "Rates of Relative Plate Motion During the Acadian Orogeny Based on the Spatial Distribution of Black Shales".
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Because major clastic wedges and basinal deposits are distributed in a southwestward progression, it is assumed they originated from areas near
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Dictionary of Geological Terms, 3rd. Edition,1984, Robert L. Bates and Julia A. Jackson, Eds., prepared by The American Geological Institute
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unusually long duration (Mississippian-Early Pennsylvanian). Subsequently, the Pocono and equivalent clastic wedges essentially filled the
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Ettensohn, Frank R. (2004). "Modeling the nature and development of major Paleozoic clastic wedges in the Appalachian Basin, USA".
341:. In the central to southern Appalachians, evidence for the Acadian orogeny is poor and is found primarily in the plutonism of the 1013:"Application of Foreland Basin Detrital Zircon Geochronology to the Reconstruction of the Southern and Central Appalachian Orogen" 158:
evidence. The paleolatitude of Gondwana during the Middle to Late Devonian resided around intermediate latitudes of about 50°S.
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near the equator, between 0° to 30°S latitude. Laurentia did not change much with respect to paleolatitude during the Devonian.
693:"A Geologic History of the North-Central Appalachians. Part 1. Orogenesis from the Mesoproterozoic Through the Taconic Orogeny" 513:
The basement structures of the Appalachian foreland basin at the onset of the Acadian orogeny were reactivated during foreland
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Assessment of Appalachian Basin Oil and Gas Resources: Devonian Shale-Middle and Upper Paleozoic Total Petroleum System
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The collision of Avalonia with Laurentia initiated a sequence of events where the older rocks were subjected to
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in the Late Ordovician, and then with Laurentia in the Late Devonian. Evidence for this is consistent with
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Park, Hyunmee; Barbeau, David L. Jr.; Rickenbaker, Alan; Bachmann-Krug, Denise; Gehrels, George (2010).
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Bradley, Dwight C. (July 1983). "Tectonics of the Acadian Orogeny in New England and Adjacent Canada".
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patterns, and the preexisting faults partitioned the basin into regions of fault-controlled uplift and
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Provinces. The St. Lawrence tectophase was active during the Early to Middle Devonian with intense
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The Acadian orogeny experienced at least three major phases of deformation, and in places,
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The collision initiating the Acadian orogeny resulted in the closing of the southern
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Naylor, Richard S. (May 7, 1971). "Acadian Orogeny: An Abrupt and Brief Event".
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The Appalachian Orogeny, a result of three separate continental collisions. USGS
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Ettensohn, Frank (1985). "The Catskill Delta complex and the Acadian Orogeny".
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that occurred over a large area of eastern Laurentia. During the course of the
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oceanic crust. It drifted in a northerly direction and probably collided with
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region of Canada, was the most greatly affected region by the collision.
43:. The Acadian orogeny is the third of the four orogenies that formed the 36: 1256: 772: 461: 1123: 1080: 944: 803: 594: 522: 498: 450: 418: 135: 1288: 365: 122:
During the time of the Acadian orogeny, Middle Devonian (385 Ma), the
1291:(Report). United States Geological Survey. Open File Report 2006-1237 581: 209: 193: 151: 469:
Foreland basins are a product of tectonic deformational loading, or
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are the following modern-day regions: northern France, Belgium (the
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events include the Neoproterozoic rift sequence from the breakup of
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marks the end of the Acadian orogeny and Catskill Delta complex.
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left behind. As Gondwana moved away, a new ocean opened up, the
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of the New York and Virginia promontories together produced the
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It was roughly contemporaneous with the Bretonic phase of the
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reconstruction showing the Appalachian Basin area during the
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arc. The initial result of loading is a bulge move out and
63:. The Acadian orogeny involved the collision of a series of 905:
10.1130/0016-7606(1988)100<0311:PPONAG>2.3.CO;2
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Ryder, RT; Swezey, CS; Crangle, RD Jr.; Trippi, MT (2008).
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latitude during the Late Ordovician through the Devonian.
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follows bulge movement and uplift and is produced on the
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Hibbard, J. P.; Van Staal, C. R.; Rankin, D. W. (2007).
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rather than northern Africa, which was supported with
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of Laurussia, with metamorphic events in southwestern
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along the orogen, a consequence of overthrusting and
1311:International Tectonic Dictionary, 1967, Memoir 7, 1287:Milici, Robert C.; Swezey, Christopher S. (2006). 1194: 1192: 1073:The Catskill Delta. Geological Society of America 1066: 1064: 1062: 1060: 1058: 1056: 1054: 477:. The Acadian foreland basin is categorized as a 1320: 971: 969: 967: 965: 963: 961: 738: 736: 734: 732: 730: 728: 834: 1198: 1189: 1051: 837:"Palaeozoic, Palaeogeography and Biogeography" 958: 877: 875: 873: 871: 802:. Northern Arizona University. Archived from 725: 481:, which occurs on the overriding continental 329:or major transcurrent movement along a large 1286: 1269:: CS1 maint: multiple names: authors list ( 1233: 576:, deposited by the Catskill Delta, includes 345:and metamorphism of the Cat Square terrane. 200:, which also includes present day northwest 881: 569:The Middle Devonian to Lower Mississippian 59:, which followed a rift/drift stage in the 51:. The preceding orogenies consisted of the 868: 325:The Acadian orogeny resulted from oblique 1389:Carboniferous geology of New York (state) 1282: 1280: 1070: 975: 943: 852: 800:Global Plate Tectonics and Paleogeography 742: 716: 449:. The deposition of Middle Mississippian 549: 465:The Acadian foreland basin is a retroarc 460: 429:deformation which formed a basin in the 364: 101: 1384:Carboniferous Newfoundland and Labrador 1152: 1146: 142:, where it then moved west of southern 138:the South Pole was located in northern 1321: 1277: 1093: 1087: 885:Geological Society of America Bulletin 835:Scotese, C.R.; McKerrow, W.S. (1990). 650: 648: 646: 644: 690: 320: 251: 1374:Devonian geology of New York (state) 1354:Geology of Newfoundland and Labrador 1227: 1004: 684: 641: 505:side of the orogen due to regional 256:Avalonian terranes that constitute 13: 1369:Devonian Newfoundland and Labrador 1201:Physics and Chemistry of the Earth 911: 793: 787: 292:. The basement consisted of Late 117: 14: 1400: 547:that was hundreds of miles long. 456: 659: This article incorporates 654: 528: 39:events extending into the early 1313:Am. Assoc. Petroleum Geologists 672:United States Geological Survey 313:during the Ordovician and in a 309:data which place Avalonia at a 67:continental fragments with the 854:10.1144/GSL.MEM.1990.012.01.01 691:Faill, Rodger T. (June 1997). 624: 412: 1: 1221:10.1016/S1474-7065(01)00010-9 617: 1116:10.1126/science.172.3983.558 360: 188: 165:and the formation of a high 126:of the Laurentia was in the 7: 1359:Geology of New York (state) 924:American Journal of Science 697:American Journal of Science 605: 10: 1405: 1329:Orogenies of North America 288:and some coastal parts of 998:10.1016/j.jog.2004.02.009 841:Geological Society Memoir 667:Valley and Ridge Province 612:Central Pangean Mountains 485:, adjacent to a foreland 27:event which began in the 1344:Paleozoic North America 1339:Carboniferous orogenies 479:retroarc foreland basin 1155:The Journal of Geology 1017:The Journal of Geology 978:Journal of Geodynamics 745:The Journal of Geology 661:public domain material 566: 466: 370: 196:is the North American 114: 16:North American orogeny 718:10.2475/ajs.297.6.551 558:nomenclature for the 553: 464: 368: 236:related to the Early 212:, the north slope of 105: 45:Appalachian Mountains 1379:Carboniferous Quebec 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Index

mountain building
Middle Devonian
plutonic
metamorphic
Mississippian
Appalachian Mountains
basin
Grenville
Taconic orogenies
Neoproterozoic
Avalonian
Laurasian
Gaspé
Variscan orogeny
Texas
Mexico
Antler orogeny
Great Basin

Paleogeographic
Middle Devonian
paleolatitude
southern hemisphere
Gondwana
Ordovician
Africa
Chile
Silurian
Argentina
paleoclimatic

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