Continuation of the Laurentian Grenville Province across the Ross Sea Margin of East Antarctica
Zircon U-Pb ages from glacial clasts in Quaternary tills of the central Transantarctic Mountains indicate the presence of Grenville-age crust along the Ross Sea margin of East Antarctica. The polymict tills contain a variety of igneous, metaigneous, and metasedimentary clasts with Proterozoic ages not known from basement exposure. Four orthogneiss clasts have igneous ages of ∼1065-1100 Ma and Ross Orogen metamorphic overgrowths of ∼500-550 Ma. The latter ages indicate that these clasts are not...[Show more]
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|Source:||Journal of Geology|
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