The Corbin Gneiss: Evidence for Grenvilliam Magmatism and Older Continental Basement in the Southernmost Blue Ridge


Heatherington, A.L., Mueller, P.M., Smith, M.S., and Nutman, A., Southeastern Geology 36: 15-25

Abstract


The Corbin Gneiss Complex is located in northern Georgia within the southernmost Blue Ridge province of the Appalachians. The dominant lithology is a porphyroclastic orthogneiss. U-Pb zircon data indicate that the orthogneiss was derived from a protolith with a minimum 206Pb/238U age of 1106 ± 13 Ma. Later tectonothermal events were sufficient to reset the U-Pb systematics of some zircons to ages as young as 950 Ma. A depleted mantle Nd model age of 1590 Ma indicates that the protolith was derived at least in part from pre-Grenvillian crust.


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