Age of zircon from volcanic rocks of the central North Carolina Piedmont and tectonic implications for the Carolina volcanic slate belt

Wright, James E.; Seiders, Victor M.

doi:10.1130/0016-7606(1980)91<287:aozfvr>2.0.co;2

Cited by 34 publications

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“…U-Pb and Th-Pb whole-rock isochrons from felsic volcanic rocks at the Haile mine indicate an age of approximately 465 Ma (LeHuray 1987). This is considerably younger than the approximately 586 Ma age (Wright and Seiders 1980) of similar appearing felsic volcanic rocks in the North Carolina portion of the CSB. However, as LeHuray (1987) has pointed out, the younger age of the volcanic rocks in the Haile-Brewer area is consistent with the presence of sponge spicules from associated sedimentary rocks that are no older than Middle Cambrian (Bourland and Rigby 1982).…”

Section: Examples From the Carolina Slate Beltmentioning

confidence: 96%

A comparison of alteration assemblages associated with Archean gold deposits in Western Australia and Paleozoic gold deposits in the southeast United States

Ririe¹

1990

Can. J. Earth Sci.

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A comparison of high-alumina mineral assemblages spatially associated with the Haile and Brewer gold deposits in the Paleozoic Carolina slate belt (CSB) of the southeast United States and the Sons of Gwalia and Mount Celia gold deposits in the Archean Norseman-Wiluna greenstone belt (NWGB) in Western Australia suggests a similar hydrothermal origin and subsequent metamorphic and deformational history. A common hydrothermal origin is supported by the striking similarity in whole-rock chemistry, even though there were probably significant variations in original unaltered protoliths. An analysis of rocks from each of the deposits that contain high-alumina minerals demonstrates that the protoliths were leached of alkalis with respect to aluminum and have a ratio of A1203 / Na10 + CaO + K 2 0 greater than three. Although the rocks contain abundant high-alumina minerals, the aluminum content in these rocks is not unusually high, and it does not appear that there has been any significant transport of aluminum either into or out of the rocks that were altered.The most common high-alumina minerals found in rocks affected by the feldspar destructive alteration event include andalusite, kyanite, pyrophyllite, kaolinite, and sericite. Other minerals present in variable amounts include diaspore, chloritoid, alunite, natroalunite: paragonite, and topaz. It is possible that some of these minerals formed during the early hydrothermal alteration event and were recrystallized during metamorphism. Regardless of when the high-alumina minerals formed, textural relations suggest that the rocks had been hydrothermally altered by the time the metamorphic minerals formed. A comparison of alteration from the deposits studied in the CSB and the NWGB suggests there are many similarities to acid-sulfate alteration associated with geothermal areas, such as Yellowstone Park, Wyoming, and with acid-sulfate gold deposits, such as Goldfield, Nevada. Thus, it is possible that the protolith of the metamorphosed rocks in the CSB and NWGB contained an alteration assemblage that included alunite, pyrophyllite, and kaolinite.A generalized paragenetic sequence determined from petrographic and field observations, beginning with regional metamorphism, follows: ( i ) formation of andalusite, kyanite, chloritoid, and topaz during prograde metamorphism, depending on whole rock chemistry, (ii) formation of pyrophyllite and quartz-rich pods during silicification of aluminosilicate-bearing rocks, (iii) bedding parallel schistosity and fracturing produced by a deformational event, (iv) fractures filled by quartz, sericite, pyrophyllite, or calcite, ( v ) folding of early layering in the rocks to form a crenulation cleavage accompanied by introduction of quartz veins at high angles to foliation; and (vi) retrograde metamorphism of andalusite-kyanite-pyrophyllite to produce an assemblage of kaolinite k diaspore.The spatial association of the acid-sulfate alteration with gold mineralization, together with comparison of analogous alteration associated with younger u...

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Section: Examples From the Carolina Slate Beltmentioning

confidence: 96%

A comparison of alteration assemblages associated with Archean gold deposits in Western Australia and Paleozoic gold deposits in the southeast United States

Ririe¹

1990

Can. J. Earth Sci.

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“…An age (in millions of years) of 586 ± 10 U-Pb has been obtained from the Uwharrie Formation, which was deposited stratigraphically above the Vermiforma antiqua occurrence in North Carolina. This 586 + 10 date from the upper part of the Uwharrie Formation is a U-Pb concordia age based on zircon crystals from felsic volcanic rocks (26). An age of 620 ± 20 U-Pb has been determined for rocks immediately below Vermiforma antiqua (8,9 By biostratigraphic correlation to the North Carolina section (see Fig.…”

Section: Body Fossilsmentioning

confidence: 93%

Ediacaran biota from Sonora, Mexico.

McMenamin

1996

Proc. Natl. Acad. Sci. U.S.A.

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“…A near-concordia zircon date of 586 +__ 10 Ma for the uppermost Uwharrie (Wright & Seiders 1980) and the presence of Vendian or Ediacaran (late Proterozoic) macrofossils in the upper Albemarle (Gibson et al 1984) fix the age. Stratigraphic similarities suggest correlation of the Uwharrie-Albemarle sequence with sequences elsewhere in the Carolina slate belt which are less securely dated.…”

Section: Accreted Terranes: Usamentioning

confidence: 95%

Plutonism and volcanism related to the pre-Arenig evolution of the Caledonide-Appalachian orogen

Rankin

Furnes

Bishop

et al. 1988

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Summary Igneous activity younger than 1 Ga related to crustal extension characterizes the western part of the orogen from N America to Scotland in the Laurentian plate and the eastern part of the orogen in Scandinavia in the Baltic plate. Sub-aerial tholeiites, locally with alkalic rhyolites at embayments, and accompanying mafic dyke-swarms indicate late Proterozoic continental rifting; oceanic tholeiites followed. Iapetus oceanic crust is preserved in ophiolites obducted to the W in Laurentia and to the E in Baltica. Ensimatic island arcs developed locally in late Cambrian and early Ordovician in Scandinavia were broadly coeval with plutonic rocks intruding continental-shelf sediments during the late Finnmarkian deformation in northern Norway. E of the Iapetus suture in N America, southern Britain and northern France many of the igneous rocks of the accreted terranes underwent or were generated during a late Proterozoic orogeny (Avalonian or Cadomian). Locally fossiliferous lower Cambrian strata rest unconformably on calc-alkaline Avalonian or Cadomian granites. Type I, or cratonal, terranes formed the rifted margins of the Iapetus Ocean. Type II, or accreted, terranes appear not to have been part of the Iapetus rifting cycle and are not now tied stratigraphically to any large cratonal masses. Type II terranes terminate northward against the projection of Tornquist’s line which may have originated in the late Proterozoic as the southern rifted margin of Baltica.

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Age of zircon from volcanic rocks of the central North Carolina Piedmont and tectonic implications for the Carolina volcanic slate belt

Cited by 34 publications

References 0 publications

A comparison of alteration assemblages associated with Archean gold deposits in Western Australia and Paleozoic gold deposits in the southeast United States

A comparison of alteration assemblages associated with Archean gold deposits in Western Australia and Paleozoic gold deposits in the southeast United States

Ediacaran biota from Sonora, Mexico.

Plutonism and volcanism related to the pre-Arenig evolution of the Caledonide-Appalachian orogen

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