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本文简要介绍了锶同位素地层学的基本原理,根据贵州惠水地区石炭系剖面中的19个锶同位素测试数据建立了此剖面的锶同位素演化曲线并与R.E.Denison的北美同时代锶同位素曲线进行了对比。两条锶同位素演化曲线的极大相似性,证实了地质历史上古海洋中的锶同位素组成具有全球一致的演化规律,是进行全球年代地层对比的可靠工具。根据对比,笔者讨论了石炭纪的全球性海平面变化和惠水石炭系剖面的年代地层划分对比,认为下石炭统与上石炭统的界线大致位于摆佐组的近底部,证实了石炭—二叠系的界线位于马平组内部。
This paper briefly introduces the basic principles of strontium isotope stratigraphy. Based on the data of 19 strontium isotopes in the Carboniferous section of Huishui, Guizhou, this strontium isotope evolution curve was established and compared with REDenison’s North American contemporaneous strontium isotope curve Compared. The great similarities between the two strontium isotope evolution curves confirm that the strontium isotope composition of the ancient ocean in the geological history has a globally consistent evolution rule and is a reliable tool for stratigraphic comparisons in the global age. According to the contrast, the author discusses the correlation between the global sea level changes of the Carboniferous and the stratigraphic division of the Huishui Carboniferous section, and holds that the boundary between the Lower Carboniferous and the Upper Carboniferous is generally located near the bottom of the Zuozuo Formation, confirming that the carbon- The boundary of the superimposed line lies within the Ma Ping group.