同位素演化 meaning in English
isotopic evolution
Examples
- This paper also discusses the strontium isotope evolution curve published over the world , present strontium isotope results of the section of cambrian in xiushan of chongqing
本文评述了国际上已有的寒武系海相碳酸盐的锶同位素演化曲线，公布了重庆秀山寒武系海相碳酸盐的锶同位素分析结果。 - Samples for strontium isotopic screened were selected by way of the test of cathodoluminescence , observation of thin sections , and analysis of sr and mn . the mn / sr value of all samples presented in this paper are less than 2 , and the cathodoluminescence is dull , however , the samples from the cambrian underwent diagenetic alteration to a certain degree , and the plotted points of the thickness and 87sr / 86sr value are somewhat discrete . the strontium isotope evolution curve drawn from the data with relatively low 87sr / 86sr value are consistent with other curves based on samples from different areas of the world , supporting the notion of global consistency of strontium isotope composition of marine carbonates
根据锯同位素地层学的基本原理，利用已有的锯同位素演化曲线，笔者确定重庆秀山寒武系剖面寒武系底界、下一中寒武统界线和中一上寒武统界线都应适当下移；另外尝试确定了重庆秀山寒武纪剖面一些关键点的年龄，累积厚度1380m处的年龄为503 ? 509ma ，累积厚度1900m处的年龄约为500ma ，这对秀山寒武系剖面下、中寒武统和中、上寒武统界线的确定具有参考价值。