Marcy Anorthosite

We use the absolute P-wave velocity and the ratio between P- and S-wave velocities (Pp/Ps) to infer the composition of the lower crust beneath the Marcy Anorthosite (New York State,... [Pg.125]

Fig. 1. The Proterozoic Grenville Province of the easternmost part of the North American craton. The Marcy Anorthosite is crossed by the O-NYNEX high-resolution seismic refraction profile. Dashed lines indicate seismic refraction profiles.

$Fig. 1. The Proterozoic Grenville Province of the easternmost part of the North American craton. The Marcy Anorthosite is crossed by the O-NYNEX high-resolution seismic refraction profile. Dashed lines indicate seismic refraction profiles.$

The observed Fp (7.0 0.1 km s" ) and the high Fp/ Fs ratio (1.84 0.02) for the lower crust beneath the Marcy Anorthosite are consistent with plagioclase-dominated mafic compositions... [Pg.128]

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