No evidence from multichannel reflection data for a crustal magma chamber in the MARK area on the Mid-Atlantic Ridge

Details No evidence from multichannel reflection data for a crustal magma chamber in the MARK area on the Mid-Atlantic Ridge No evidence from multichannel reflection data for a crustal magma chamber in the MARK area on the Mid-Atlantic Ridge

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.347...61d&link_type=abstract

Nature, Volume 347, Issue 6288, pp. 61-64 (1990).

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26

Scientific paper

THE role of crustal magma chambers in the construction of oceanic crust along the slowly spreading Mid-Atlantic Ridge (MAR) is still highly disputed1. Some investigators have argued for small, short-lived crustal magma bodies2, whereas others have postulated the presence of permanent reservoirs centred between ridge offsets, which expand and contract in response to a fluctuating magma supply3. Thermal modelling4,5, detailed seismic refraction experiments at several different locations along the MAR6-9, and micro-earthquake10,11 and teleseismic-source mechanism studies12 preclude the existence of large, steady-state magma chambers under the entire MAR rift valley; however, smaller, localized crustal magma bodies could be present, at least intermittently. Here we use multichannel seismic reflection profiles to look for evidence of a crustal magma chamber along the MAR south of the Kane fracture zone, in one of the most magmatically robust and hydro-thermally active areas presently known along the MAR. Although some subbasement reflectors are imaged, we do not see a shallow, large-amplitude, intracrustal reflector that might be associated with a crustal magma body. If a crustal magma chamber was associated with the most recent volcanic episode along this part of the MAR, our results suggest that it was extremely short-lived.

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