As opposed to discontinuous seafloor dredging and coring, ophiolites and downhole geophysical measurementsp rovide continuouss ectionsa long which high frequency accretion processes at mid-ocean ridges may be studied. A multidisciplinary study carried out on a volcanic section of the Semail ophiolite with MORB-like chemical composition reveals two main petrological and geochemical members. The boundary between the two is marked by the presence of a massive flow equating to the most primitive lava sampled, and across which significant changes are obtained.P etrophysicapl rofiles are correlatedt o geochemical variations and provide thus a description of the magmatic activity through time. These temporal variations may be compared to those derived from crustal drilling and continuous logging measurements.
...
مادة فرعية
Geophysical Research Letters