Method of ophiolite geochronology study and the related problems

The ophiolite geochronology is very important for the study of tectonic evolution of orogenic belt and the reconstruction of the ancient ocean-land and plate tectonic framework.The isotopic dating and fossil geochronometry are the basic methods of ophiolite geochronometry.U-Pb isotopic dating including single zircon U-Pb dating and SHRIMP zircon U-Pb dating is the first to be selected for the high precise isotopic dating.And Sm-Nd and Rb-Sr isochronal dating can be used to be assistant for it.The result of all these da ing methods and fossil geochronometry should be contrased each other.The sequence of some geological events related to the formation and evolution of ophiolite can give the rest riction on its geologic ages.This paper points that we must study the charact eristics of the dating objects in detail before daing of the ophiolite,and simult aneously know the applicability of various of dating methods and problems which should be at tended,thus we can draw the reasonable and scientific explanation to the signification and accuracy of dating results.