The Hillabee Greenstone: A mafic volcanic complex in the Appalachian Piedmont of Alabama

Tull, James F.; Stow, Stephen H.

doi:10.1130/0016-7606(1980)91<27:thgamv>2.0.co;2

Cited by 19 publications

(31 citation statements)

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“…2A), has been extensively studied, and trace and major element data indicate a volcanic arcrelated setting (Tull and Stow, 1980;Durham, 1993;Tull et al, 1998;McClellan et al, 2007) and an Ordovician (460-470 Ma) crystallization age (McClellan et al, 2007;Tull et al, 2007).…”

Section: Previous Workmentioning

confidence: 97%

Bimodal volcanism as evidence for Paleozoic extensional accretionary tectonism in the southern Appalachians

Holm-Denoma

Das

2010

Geological Society of America Bulletin

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Detailed mapping, U-Pb ages of igneous and detrital zircons, and isotopic and geochemical characterization of a bimodal volcanic sequence from the Appalachian Blue Ridge province provide constraints for the timing and tectonic setting of volcanism along the Early Paleozoic southeastern Laurentian margin. These units, the Pumpkinvine Creek Formation and related rocks, are interpreted as having been deposited along an extended Laurentian margin in a backarc setting during the mid-Ordovician, and tectonically emplaced as late as the late Paleozoic Alleghanian orogeny. Two felsite layers from the Pumpkinvine Creek Formation, a bimodal metavolcanic sequence, have ages of 466 ± 5 Ma and 461 ± 3 Ma. Geochemical analyses of metabasalts indicate compositions derived from a suprasubduction zone, and more specifi cally a backarc. Furthermore, ε Nd(460 Ma) = (+)3.3-(+)7.7 and 87 Sr/ 86 Sr (initial) = 0.7044-0.7069 indicate a juvenile source. The protoliths of the felsic lithofacies were low-potassium rhyodacite, and have ε Nd(460 Ma) = (−)3.2-(+)4.65 and 87 Sr/ 86 Sr (initial) = 0.709-0.722, suggesting incorporation of an evolved crustal component, which we interpret as Laurentian continental lithosphere. Furthermore, detrital zircons derived from within the Pumpkinvine Creek Formation yielded a majority of ages between 1017 and 1190 Ma, indicating that the source is likely a component of the rifted eastern Laurentian margin. A backarc origin for the Pumpkinvine Creek Formation indicates that the geodynamic setting of the southeastern margin of Laurentia included a retreating subduction zone resulting in extensional accretionary tectonism. These results have implications for the evolution of the southeastern Laurentian margin during a time traditionally linked to collision of an exotic Taconic arc with Laurentia. Additionally, we suggest that there are signifi cant along-orogen disparities that may result from fundamental tectonic boundaries.

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Section: Previous Workmentioning

confidence: 97%

Bimodal volcanism as evidence for Paleozoic extensional accretionary tectonism in the southern Appalachians

Holm-Denoma

Das

2010

Geological Society of America Bulletin

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“…The dominant lithology is dark green, massive, finegrained rock of tholeiitic composition (Table 1). Spheroidal zones interpreted as pillow flows are interbedded with mafic phyllite, hornblende-bearing siliceous pyroclastic beds (phyllite), and quartzite (Griffin, 1951;Tull and Stow, 1982). Minor sericitechlorite and quartz-sericite phyllite (Long, 1979;Hayes-Davis, 1979;) also may be products of hydrothermal alteration; however, such alteration effects cannot be distinguished from the effects of subsequent metamorphism.…”

Section: Talladega Terranementioning

confidence: 97%

“…The felsic rocks are calc-alkaline and were interpreted by Tull and Stow (1982) to be ash flows. The rocks are similar to volcanics associated with Kuroko deposits.…”

Section: Talladega Terranementioning

confidence: 99%

“…Hillabee Greenstone and massive sulfides: The upper part of the Unity Group contains the massive Hillabee Greenstone, which is interpreted as the distal part of a volcanic-arc system (Tull andStow, 1980a andb, 1982). Protoliths of the Hillabee evidently spread northwestward from the island arc over chert (?)…”

Section: Talladega Terranementioning

confidence: 99%

“…Although many such deposits have been described (Shearer and Hull, 1918;Watkins, 1939;Ballard and Mcintosh, 1948;Espenshade, 1963;LaMont and Hastings, 1964;Magee, 1968;Cook, 1970;Hurst and Crawford, 1970;Tull andStow, 1980a andb, 1982;Whittington, 1982), very little has been written concerning the possible original tectonic settings of the deposits. This paper provides an overview of the lithologic and inferred tectonic settings of the different massive sulfide occurrences in the Ashland, Wedowee, and Talladega lithotectonic terranes as an aid to future regional exploration.…”

Section: Introductionmentioning

confidence: 96%

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Volcanogenic sulfide deposits in the southernmost Appalachians

Neathery

Hollister²

1984

Economic Geology

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Volcanogenic massive sulfide deposits in the southernmost Appalachians of east-central Alabama and west-central Georgia are associated with metamorphosed submarine basalts and felsic rocks of the Ashland, Wedowee, and Talladega lithotectonic terranes. These three terranes lie between the Brevard fault on the south and the Talladega-Cartersville and Hayesville faults on the north. The oldest sulfide deposits occur in a regional setting characterized by a thick sequence of metamorphosed Eocambrian to lower Paleozoic continentally derived clastic and intercalated submarine metavolcanic rock. The metamorphosed elastic rocks represent the basal section of a rifted margin prism, whereas the metavolcanic rocks represent rhyolites, andesites, and basalts which were probably erupted along rift zones of a spreading back-arc basin. Most of the volcanogenie massive sulfide deposits are localized within metavolcanic rocks and are rare or absent in the enclosing or interbedded metasedimentary rock. The youngest sulfide deposits occur in the distal part of a volcanic arc sequence of the Talladega terrane, which terminated sediment deposition and volcanic activity in the region. Talladega terrane sulfide deposits appear anomalously young (Devonian) respective to other deposits in the eastern United States.Three types of massive sulfide host rock associations have been recognized in the southernmost Appalachians; Kuroko-type deposits associated with predominantly felsic volcanic assemblages, Anyox-type deposits associated with predominantly mafic volcanic assemblages, and Besshi-type deposits associated with interbedded assemblages of elastic sedimentary and marie volcanic rocks.

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An example of trondhjemite petrogenesis: the Blakes Ferry pluton, Alabama, U.S.A.

Defant

Drummond

Arthur

et al. 1988

Lithos

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The Hillabee Greenstone: A mafic volcanic complex in the Appalachian Piedmont of Alabama

Cited by 19 publications

References 0 publications

Bimodal volcanism as evidence for Paleozoic extensional accretionary tectonism in the southern Appalachians

Bimodal volcanism as evidence for Paleozoic extensional accretionary tectonism in the southern Appalachians

Volcanogenic sulfide deposits in the southernmost Appalachians

An example of trondhjemite petrogenesis: the Blakes Ferry pluton, Alabama, U.S.A.

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