Ion microprobe age and geochemistry of southern appalachian basement, with implications for Proterozoic and Paleozoic reconstructions

Carrigan, Charles W.; Miller, Calvin F.; Fullagar, Paul D.; Bream, Brendan R.; Hatcher, Robert D.; Coath, C. D.

doi:10.1016/s0301-9268(02)00113-4

Cited by 60 publications

(71 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Central Appalachian basement hosting allochthonous Grenville inliers give Nd model ages that range from 1.52 to 1.25 Ga (Pettingill et al, 1984;Owens & Samson, 2004). The Nd model ages of southern Appalachian granites range from 1.75 to 1.34 Ga (Fullagar et al, 1997;Carrigan et al, 2003;Ownby et al, 2004;Berquist 2005), except for the Roan Mountain (Fisher et al, 2010 and refs. therein) that give igneous crystallization ages between 1.3 and 1.2 Ga (Carrigan et al, 2003;Ownby et al, 2004).…”

Section: Rocks Of the Subsurface Grenville Orogen In The Mid-continentmentioning

confidence: 99%

“…The Nd model ages of southern Appalachian granites range from 1.75 to 1.34 Ga (Fullagar et al, 1997;Carrigan et al, 2003;Ownby et al, 2004;Berquist 2005), except for the Roan Mountain (Fisher et al, 2010 and refs. therein) that give igneous crystallization ages between 1.3 and 1.2 Ga (Carrigan et al, 2003;Ownby et al, 2004). Nd model ages of Roan Mountain range from 2.32…”

Section: Rocks Of the Subsurface Grenville Orogen In The Mid-continentmentioning

confidence: 99%

“…Page 7 of 53 A c c e p t e d M a n u s c r i p t to 1.65 Ga (Carrigan et al, 2003;Ownby et al, 2004), but Alenikoff et al (2103 showed that the Carvers Gap granulite from the Roan Mountains is not of igneous origin but rather a 1.0 Ga metasedimentary rock probably derived from 1.8 Ga Amazonian crust. Overall, Grenvillian crustal blocks exposed in the eastern and southern parts of Laurentia yield Nd model ages with a peak between 1.5 to 1.3 Ga (Owens & Samson, 2004).…”

Section: Rocks Of the Subsurface Grenville Orogen In The Mid-continentmentioning

confidence: 99%

“…It is noteworthy that all samples except for the Lake sample, are quartz-rich felsic rocks but the Lake sample, east of our revised crustal boundary, has a Si-undersaturated intermediate and juvenile composition. Nd isotopes from southern Appalachians suggest the presence of a Meso-and Paleoproterozoic basement in the Blue Ridge (Fullagar, 2002;Carrigan et al 2003), and a ca. 1.7 Ga basement to the Inner Piedmont Province is indicated by Pb isotope data (Stuckless et al 1986).…”

Section: Implications For the Grenville Provincementioning

confidence: 99%

“…7). The eastern terranes of Grenville have been suggested to be rifted Laurentian fragments reconnected to the main continent during the Appalachian orogeny (Carrigan et al, 2003). Both the Blue Ridge of Virginia and the Mars Hill terrane have been shown to have >1.5 Ga basement components (Fig.…”

Section: Implications For the Grenville Provincementioning

confidence: 99%

See 4 more Smart Citations

Zircon U-Pb, Hf and O isotope constraints on growth versus reworking of continental crust in the subsurface Grenville orogen, Ohio, USA

Petersson

Scherstén

Andersson

et al. 2015

Precambrian Research

View full text Add to dashboard Cite

Section: Rocks Of the Subsurface Grenville Orogen In The Mid-continentmentioning

confidence: 99%

Section: Rocks Of the Subsurface Grenville Orogen In The Mid-continentmentioning

confidence: 99%

Section: Rocks Of the Subsurface Grenville Orogen In The Mid-continentmentioning

confidence: 99%

Section: Implications For the Grenville Provincementioning

confidence: 99%

Section: Implications For the Grenville Provincementioning

confidence: 99%

See 3 more Smart Citations

Zircon U-Pb, Hf and O isotope constraints on growth versus reworking of continental crust in the subsurface Grenville orogen, Ohio, USA

Petersson

Scherstén

Andersson

et al. 2015

Precambrian Research

View full text Add to dashboard Cite

Crustal velocity structure associated with the eastern Tennessee seismic zone: Vp and Vs images based upon local earthquake tomography

et al. 2014

View full text Add to dashboard Cite

We present three-dimensional P and S wave velocity models for the active eastern Tennessee seismic zone (ETSZ) using arrival time data from more than 1000 local earthquakes. A nonlinear tomography method is used that involves sequential inversion for model and hypocenter parameters. We image several velocity anomalies that persist through most of the inversion volume. Some anomalies support the presence of known features such as an ancient rift zone in northern Tennessee. Other anomalies reveal the presence of basement features that can be correlated with regional gravity and magnetic anomalies. We image a narrow, NE-SW trending, steeply dipping zone of low velocities that extends to a depth of at least 24 km and is associated with the vertical projection of the prominent New York-Alabama magnetic lineament. The low-velocity zone may have an apparent dip to the SE at depths exceeding 15 km. The low-velocity zone is interpreted as a major basement fault juxtaposing Granite-Rhyolite basement to the NW from Grenville southern Appalachian basement to the SE. Relocated hypocenters align in near-vertical segments suggesting reactivation of a distributed zone of deformation associated with a major strike-slip fault. We suggest that the ETSZ represents reactivation of an ancient shear zone established during formation of the super continent Rodinia.

show abstract

Post‐rift magmatic evolution of the eastern North American “passive‐aggressive” margin

Mazza

Gazel

Johnson

et al. 2017

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Understanding the evolution of passive margins requires knowledge of temporal and chemical constraints on magmatism following the transition from supercontinent to rifting, to post-rifting evolution. The Eastern North American Margin (ENAM) is an ideal study location as several magmatic pulses occurred in the 200 My following rifting. In particular, the Virginia-West Virginia region of the ENAM has experienced two postrift magmatic pulses at $152 Ma and 47 Ma, and thus provides a unique opportunity to study the long-term magmatic evolution of passive margins. Here we present a comprehensive set of geochemical data that includes new 40 Ar/ 39 Ar ages, major and trace-element compositions, and analysis of radiogenic isotopes to further constrain their magmatic history. The Late Jurassic volcanics are bimodal, from basanites to phonolites, while the Eocene volcanics range from picrobasalt to rhyolite. Modeling suggests that the felsic volcanics from both the Late Jurassic and Eocene events are consistent with fractional crystallization. Sr-Nd-Pb systematics for the Late Jurassic event suggests HIMU and EMII components in the magma source that we interpret as upper mantle components rather than crustal interaction. Lithospheric delamination is the best hypothesis for magmatism in Virginia/West Virginia, due to tectonic instabilities that are remnant from the long-term evolution of this margin, resulting in a ''passive-aggressive'' margin that records multiple magmatic events long after rifting ended.Citation:

show abstract

Ion microprobe age and geochemistry of southern appalachian basement, with implications for Proterozoic and Paleozoic reconstructions

Cited by 60 publications

References 69 publications

Zircon U-Pb, Hf and O isotope constraints on growth versus reworking of continental crust in the subsurface Grenville orogen, Ohio, USA

Zircon U-Pb, Hf and O isotope constraints on growth versus reworking of continental crust in the subsurface Grenville orogen, Ohio, USA

Crustal velocity structure associated with the eastern Tennessee seismic zone: Vp and Vs images based upon local earthquake tomography

Post‐rift magmatic evolution of the eastern North American “passive‐aggressive” margin

Contact Info

Product

Resources

About