Subduction Initiation Record(SIR) in Suprasubduction Zone Ophiolites

摘要

The internal structure-stratigraphy and geochemical characteristics of suprasubduction zone(SSZ)ophiolites in different orogenic belts indicate a seafloor spreading origin in forearc-incipient arc settings during the initial stages of subduction.In general,there is a well-developed magmatic stratigraphy in the extrusive sequences of these ophiolites from older MORB-like lavas at the