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上海金山群变质岩Rb—Sr、Sm—Nd同位素年令测定成果 被引量:1

The Resuits on Metamorphic Rock System in Shanghai Jinshan Groups by Rb-Srand Sm. Nd Isotopic Age Determination
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摘要 采自上海地区基底变质岩系金山群中的外长角闪岩类,经Rb—Sr及Sm—Nd等时线法测定,其年令分别为11.23±0.27Ma和13.64±1.13Ma,再从角闪石Ar^(40)/Ar^(39)体系分析,又可视其后期曾有过多次热事件的叠加。通过上述同位素年令测定资料说明,区内存在一套较古老的变质岩系,其形成时代为中元古代(甚至更早),在显生宙期间又显示出曾经多期改造的复杂的地质演化过程,这对认识、分析杨子地块东南边部之大地构造格局无疑提供了一个新的资料和依据。 By Rb-Sr and Sm-Nd isochron dating, the date of the Amphibolite, which from bed metamorphic rock in Shanghai Jinshan Group, is 11.23±0.27 Ma and 13.64±1.13 Ma respectively, and by analysing Amphibole Ar40/Ar39 system.it could be considered the there had been serveral repetitions of thermal event in the late period. The above-mentioned data obtained by isotopic age determination has demonstrated the formation of a set of old metamorphic rock system in the area belonged to Middle Proterozoic Era, and multi-period reformations-the process of complicated geologic evolution were displayed in the phanerozoic Eon. All these,no doubt, would provide some new information and scientific basis for analysing geologic structural layout of the southeast edge section of the Yangtze land mass.
出处 《上海地质》 1995年第3期15-20,共6页
关键词 金山群 变质岩 同位素 年龄测定 Jinshan Group, isotopic age (Rb-Sr total rock, Sm- Ndtotal rock), middle Proterozoic Era.
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