Mantle and Lower Crust Exposed in Oceanic Ridges and in Ophiolites - Contributions to a Specialized Symposium of the VII EUG Meeting, Strasbourg, Spring 1993

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Mantle and Lower Crust Exposed in Oceanic Ridges and in Ophiolites - Contributions to a Specialized Symposium of the VII EUG Meeting, Strasbourg, Spring 1993

Vissers, R. L. M./ Nicolas, A. (EDT)

ウェブストア価格 ¥23,538（本体¥21,399）
Kluwer Academic Pub（1995/07発売）
外貨定価 US$ 109.99
ポイント 213pt

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製本 Hardcover:ハードカバー版／ページ数 224 p.
言語 ENG
商品コード 9780792334910
DDC分類 551.136

Full Description

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 contribu tions to the Symposium justified a volume presenting its main scientific achievements. The present title of the volume shows that the center of inter est has slightly shifted with respect to the initial objective: in order to under 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 rela 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.

I: Marine Studies.- An Ultramafic Lift at the Mid-Atlantic Ridge: Successive Stages of Magmatism in Serpentinized Peridotites from the 15oN Region.- Gabbroic Dikelets in Serpentinized Peridotites from the Mid-Atlantic Ridge at 23o20?N.- Mafic and Ultramafic Intrusions into Upper Mantle Peridotites from Fast Spreading Centers of the Easter Microplate (South East Pacific).- II: Ophiolite Studies.- Plastic Deformation of Gabbros in a Slow-spreading Mesozoic Ridge: Example of the Montgenèvre Ophiolite, Western Alps.- Pre-orogenic High Temperature Shear Zones in an Ophiolite Complex (Bracco Massif, Northern Apennines, Italy).- A Detailed Study of Mantle Flow away from Diapirs in the Oman Ophiolite.- III: Numerical Modelling.- Non Steady-State Thermal Model of Spreading Ridges: Implications for Melt Generation and Mantle Outcrops.