Peridotite composition from the North Atlantic: regional and tectonic variations and implications for partial melting

Details Peridotite composition from the North Atlantic: regional and tectonic variations and implications for partial melting Peridotite composition from the North Atlantic: regional and tectonic variations and implications for partial melting

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..73...91m&link_type=abstract

Earth and Planetary Science Letters, Volume 73, Issue 1, p. 91-104.

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Scientific paper

Mineral chemical parameters and modal abundances for mantle-derived abyssal peridotite tectonites from 14 locations in the North Atlantic (0-79°N) vary over considerable ranges and are correlated together. The data indicate that there are differences in the bulk chemistry of the peridotites which correspond to the amount of basaltic melt that has been extracted from them. These differences appear to be regional in extent. Peridotites from 34° to 45°N are the most refractory. The more intense depletion could have resulted from greater extents of partial melting, possibly caused by the presence of the Azores hotspot in this region; or it could be a pre-existing depletion, due to an earlier melting event. Basalt chemical data does not rule out either possibility, but supports greater extents of partial melting occurring in this region.
The regional variations in mantle peridotite composition correlate with long-wavelength variations of crustal elevation and gravity along the northern Mid-Atlantic Ridge. These correlations support the existence of regional variations of upper mantle thermal structure and composition.
Peridotites collected from fracture zones are compared with those collected away from fracture zones in the same region. Based on basalt studies, there may well be a decrease in the amount of melting as certain fracture zones are approached. The peridotite data suggest that this may be true for some fracture zones but not others. In general, peridotites collected from fracture zones are representative of the suboceanic mantle.

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