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We apply multiple geochemical tools to these rocks: tectonic discrimination using whole-rock major and trace element abundances; whole-rock Sm-Nd isotopes; O, U-Pb, and Lu-Hf isotope analyses of spots in zircon; and measurement of O isotopes in multi-grain quartz separates. Goochland Terrane continental crust first separated from the mantle prior to ca. The granitic magma that became the State Farm Gneiss protolith could have been derived entirely from partial melting of this initial Goochland Terrane crust.
In contrast, the magmas that became the Montpelier Anorthosite, Neoproterozoic granitoid, and the Sabot Amphibolite were mixtures of mantle melt and preexisting Goochland Terrane crust. This production of juvenile continental crust occurred during continental extension and, eventually, rifting. The timing and compositions of terminal Mesoproterozoic magmatism in the Goochland Terrane closely match those in the nearby Blue Ridge Province.
Although the compositions of the Neoproterozoic magmas in the two regions are similar, intrusion and possibly eruption occurred about 10 M. Juvenile continental crust was added before Ma and at , —, and Ma.
Terminal Mesoproterozoic and Neoproterozoic crust addition in extensional settings. Goochland Neoproterozoic magmatism was 10 M.
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Philip Piccoli enabled our use of the electron microprobe at the University of Maryland. We are grateful to George Gehrels, Mark Pecha, and the staff of the Arizona LaserChron Center for facilitating our zircon analyses in their laboratory. We thank Robert Stern for efficient editorial handling as well as Arne Willner and four anonymous reviewers for helpful reviews.
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