蛇绿岩年代学研究方法及应注意的问题
Method of ophiolite geochronology study and the related problems
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摘要: 蛇绿岩年代学在研究造山带构造演化、古洋-陆及板块构造格局恢复中至关重要.同位素测年及化石年代学法是蛇绿岩年代学研究的基本方法.高精度同位素测年首选锆石U-Pb法(包括单颗粒锆石U-Pb法、离子探针SHRIMPU-Pb法)及40Ar-39Ar法,同时可辅以Sm-Nd及Rb-Sr等时线法测年;各种测年方法所获结果与化石年代之间应相互比对;与蛇绿岩形成、演化相关的各地质事件发生的时间可以对蛇绿岩的形成时代进行约束.测年时必须对所测对象的特征及性质进行详细的研究.同时,对各种测年方法的适用性和应注意的问题有所了解,唯此才能对测年结果的含义及准确性做出科学、合理的解释.Abstract: 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.
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Keywords:
- ophiloite /
- isotopic dating /
- fossil geochronometry /
- restriction on age
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