Terra Nova Batholith

Fig. 4.7 The rocks exposed in the Deep Freeze Range between the Campbell and Priestley Glaciers include the folded metasedimentary rocks of the Priestley Schist which was intruded by the composite Terra Nova batholith of the Granite Harbor Intrusives (GHI). The metamorphic grade of the Priestley Schist increases until it grades into the Snowy Point Gneiss (SPG) which is a paragneiss composed of coarse and lenticular layers of quartz, microcline, oligoclase, biotite, and muscovite (Adapted from Skinner 1983)...

Fig. 4.8 Whole-rock Rb-Sr isochron of Granite Harbor Intrusives (GHI) of the Terra Nova batholith in the Deep Freeze Range and from Timber Peak, Ogden Heights, and Mt. Nansen in the Terra-Nova-Bay area of the Wilson Terrane. All of the samples of the GHI he close to the straight line that was fitted by linear least-squares regression. The slope (m = 0.00722569) yields a date of 507.0 7 Ma and an initial Sr/ Sr ratio of 0.71034 0.00022 (o ). A migmatite (x) that was intruded by the Mt. Abbott pluton in the Deep Freeze Range (Fig. 4.7) is either much older (about 820 Ma) or has a higher initial ration (0.72709) than the rocks that define the straight line in this diagram (Data from Armienti et al. 1990)...

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