Thrusting of young lithosphere in subduction zones with special reference to structures in ophiolitic peridotites

Details Thrusting of young lithosphere in subduction zones with special reference to structures in ophiolitic peridotites Thrusting of young lithosphere in subduction zones with special reference to structures in ophiolitic peridotites

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..46..397n&link_type=abstract

Earth and Planetary Science Letters, Volume 46, Issue 3, p. 397-406.

Physics

13

Scientific paper

Two contrasted types of structures have been recognized in peridotites from ophiolites and from the oceanic environment. The first one, typical of high-temperature/moderate-stress conditions, is observed in the upper part of ophiolitic peridotites and has been ascribed to plastic flow in an oceanic ridge environment. The second one, typical of moderate-temperature/high-stress conditions, is more specially dealt with here. It is printed in the peridotites above the basal metamorphic aureole found in many ophiolites. The strain increases downward over 1-2 km to produce peridotite mylonites at the contact with the metamorphic aureole. Similarities with rocks from trench and island arc environments suggest ascribing this deformation in ophiolites to a trench environment. We propose that shear fracturing in a young oceanic lithosphere is initiated by the compressive elastic stress in its lower part which is produced by bending of the subducted plate. An externally applied compressive stress is responsible for subsequent overthrusting of the fractured lithosphere. This interpretation is in good agreement with the available geophysical data on young subducted plates and with the physical data on ophiolitic peridotites.

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