Average compositions and analyses range for clinopyroxene, olivines, orthopyroxene, and spinel from the MARK area at DSDP Site 45-395A, and ODP Site 153-920

Mineral compositions of residual peridotites collected at various locations in the Mid-Atlantic Ridge south of the Kane transform (MARK area) are consistent with generally smaller degrees of melting in the mantle near the large offset Kane transform than near the other, small offset, axial discontin...

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Bibliographic Details
Main Authors: Ghose, Indraneel, Cannat, Mathilde, Seyler, Monique
Format: Dataset
Language:English
Published: PANGAEA 1996
Subjects:
153-920B
153-920D
45-395A
Deep Sea Drilling Project
DRILL
Drilling/drill rig
DSDP
Glomar Challenger
Joides Resolution
Leg153
Leg45
North Atlantic Ocean
Ocean Drilling Program
ODP
Kane
Mid-Atlantic Ridge
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.721826
https://doi.org/10.1594/PANGAEA.721826
Description
Summary:Mineral compositions of residual peridotites collected at various locations in the Mid-Atlantic Ridge south of the Kane transform (MARK area) are consistent with generally smaller degrees of melting in the mantle near the large offset Kane transform than near the other, small offset, axial discontinuities in the area. We propose that this transform fault effect is due to along-axis variations in the final depth of melting in the subaxial mantle, reflecting the colder thermal regime of the ridge near the Kane transform. Calculations made with a passive mantle flow regime suggest that these along-axis variations in the final depth of melting would not produce the full range of crustal thickness variations observed in the MARK area seismic record. It is therefore likely that the transform fault effect in the MARK area is combined with other mechanisms capable of producing crustal thickness variations, such as along-axis melt migration, the trapping of part of the magma in a cold mantle root beneath the ridge, or active mantle upwelling.

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