This volume follows a Specialized Symposium on "Mantle denudation in slow spreading ridges and in ophiolites", held at the XII EUG Meeting in Strasbourg, spring 1993. During the meeting it was felt that the contribuÂ tions to the Symposium justified a volume presenting its main scientific achievements. The present title of the volume shows that the center of interÂ est has slightly shifted with respect to the initial objective: in order to underÂ stand the processes involved in accretion taking place at oceanic ridges, it is crucial to study the interaction between uppermost mantle and lower crust. The approach favored here is that of petrological and structural analysis of oceanic rocks in present-day oceanic ridges combined with similar studies in ophiolites. Rock specimen collected by submersibles or dredge hauls in oceanic ridge environments provide a "ground truth". However, except for areas such as the MARK (Mid-Atlantic Ridge ne ar Kane fracture zone) where, thanks to multiple submersible dives, the local geology is known with aprecision even better than in many onshore ophiolites, mutual relaÂ tionships between uppermost mantle and lower crust are poorly known. In contrast, onshore ophiolites provide a necessary large-scale picture built up over many years of structural and petrological mapping.
With a familiar song as its root, this shared-reading book will encourage new readers to share the story--either as they read or as they are read to. Lively, colorful illustrations and a melodic rhyme assist children in gathering information about this young boy's journey down the bay.
The "vulture of the sea," borne upon broad wing, and wandering over the wide Atlantic, suddenly suspends his flight to look down upon an object that has attracted his attention. It is a raft, with a disc not much larger than a dining-table, constructed out of two small spars of a ship, -the dolphin-striker and spritsail yard, -with two broad planks and some narrower ones lashed crosswise, and over all two or three pieces of sail-cloth carelessly spread.
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