Fig. 6: P-wave velocity versus density for various rock types.
From: Northern Scandinavian mountains supported by a low-grade eclogitic crustal keel
Lines show trends calculated based on laboratory data39,40,41,42. Brown and purple curves illustrate the effects of metamorphic reactions from crustal mafic granulite to eclogite and from mantle peridotite to serpentinite (numbers show percentages of reaction products). A swarm of green and blue lines shows the effects of variation of iron (forsterite, Fo) and water content for various mantle peridotitic rocks. Black box shows typical upper mantle composition. Coloured bands illustrate uncertainties of calculated values. Symbols—averaged measured values for various crustal and mantle rocks; eclogite (CM95) is discussed in text. Black rectangular symbols show sub-Moho values in the central part of our profile (Fig. 5) in the 44–60 and 60–120 km depth intervals below the Scandes (C1, C2) and the Svecofennian shield (S1, S2), grey box shows the uncertainty. Fo forsterite, Fa fayalite, En enstatite, Fs ferrosilite, opx orthopyroxene, ol olivine.
