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Research ArticleArticles

Geodynamic evolution of the central Appalachian orogen: Geochronology and compositional diversity of magmatism from Ordovician through Devonian

A. Krishna Sinha, William A. Thomas, Robert D. Hatcher and T. Mark Harrison
American Journal of Science October 2012, 312 (8) 907-966; DOI: https://doi.org/10.2475/08.2012.03
A. Krishna Sinha
*Department of Geosciences, Virginia Tech, Blacksburg, Virginia 24061, USA
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William A. Thomas
**Department of Earth and Environmental Sciences, University of Kentucky, Lexington, Kentucky 40506-0053, USA
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Robert D. Hatcher Jr.
***Department of Earth and Planetary Sciences, and Science Alliance Center of Excellence, University of Tennessee, Knoxville, Tennessee 37996-1410, USA
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T. Mark Harrison
§Department of Earth and Space Sciences, University of California, Los Angeles, Los Angeles, California 90095-1567, USA
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American Journal of Science: 312 (8)
American Journal of Science
Vol. 312, Issue 8
1 Oct 2012
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Geodynamic evolution of the central Appalachian orogen: Geochronology and compositional diversity of magmatism from Ordovician through Devonian
A. Krishna Sinha, William A. Thomas, Robert D. Hatcher, T. Mark Harrison
American Journal of Science Oct 2012, 312 (8) 907-966; DOI: 10.2475/08.2012.03

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Geodynamic evolution of the central Appalachian orogen: Geochronology and compositional diversity of magmatism from Ordovician through Devonian
A. Krishna Sinha, William A. Thomas, Robert D. Hatcher, T. Mark Harrison
American Journal of Science Oct 2012, 312 (8) 907-966; DOI: 10.2475/08.2012.03
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  • Article
    • Abstract
    • INTRODUCTION
    • REGIONAL GEOLOGY OF THE CENTRAL APPALACHIAN OROGEN
    • ANALYTICAL METHODS
    • THE MAGMATIC RECORD IN THE CENTRAL APPALACHIAN OROGEN
    • GROUP I (EARLY ORDOVICIAN CENTRAL APPALACHIAN ARC COMPLEX; EOCAAC)
    • GROUP II: SYNTECTONIC MAGMATISM ASSOCIATED WITH ARC-CONTINENT COLLISION (MID-ORDOVICIAN TACONIC OROGENY)
    • GROUP III (LATE ORDOVICIAN CENTRAL APPALACHIAN ARC COMPLEX; LOCAAC)
    • GROUP IV (SILURIAN MAGMATISM ASSOCIATED WITH EXTENSION)
    • GROUP V (DEVONIAN MAGMATISM ASSOCIATED WITH ACCRETION OF PERI-GONDWANAN TRACTS)
    • GEOCHEMICAL SIGNATURE OF IGNEOUS ROCKS
    • INTERPRETATION: GEOCHEMICAL SIMILARITIES AND DIFFERENCES BETWEEN GROUPS
    • RIFTED MARGIN GEOMETRY AND COMPOSITIONAL DIVERSITY OF SILURIAN (GROUP IV) IGNEOUS ROCKS
    • INTERPRETATION OF TECTONIC FRAMEWORK OF MAGMA GENESIS THROUGH TIME
    • SUMMARY OF CONCLUSIONS
    • ACKNOWLEDGMENTS
    • APPENDIX 1
    • REFERENCES
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Keywords

  • Arc magmatism
  • geochronology
  • orogeny
  • Appalachians

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