论文部分内容阅读
随着锶同位素研究的深入和在海相地层学中的广泛应用,锶同位素地层学已经成为地层学研究中的重要领域。锶同位素地层学方法具有其他地层学方法所不能比拟的优势,锶同位素不会因为压力、温度、微生物的作用而产生分馏,当海相同生矿物形成的时候,它们从海水中获得锶,不会引起锶同位素组成(87Sr/86Sr)的变化,因此不同的海相同生碳酸盐矿物具有一致的锶同位素组成,它们能够记录地质历史中原始海水的锶同位素组成。鉴于锶在海水中的滞留时间(约为106a)远长于海水的混合时间(103a),因而在任一时刻全球范围的内海水锶同位素组成被认为是一致的,反映了海洋长周期的独特的变化趋势,
Strontium isotope stratigraphy has become an important area in the study of stratigraphy with the research of strontium isotope and its extensive application in marine stratigraphy. Strontium isotope stratigraphy method has the advantage of other stratigraphic methods can not be compared, strontium isotopes will not be due to pressure, temperature, microorganisms and the role of fractionation, when the same marine mineral formation, they get strontium from seawater, will not Causing changes in the strontium isotope composition (87Sr / 86Sr), so that different marine marine carbonate minerals have consistent strontium isotopic compositions that record the strontium isotopic composition of the pristine seawater in geological history. The strontium isotope composition of inland seawater at all times is considered consistent at all times, reflecting the unique variation of the oceanic long period, given that the strontium residence time (about 106a) in seawater is much longer than the seawater mixing time (103a) trend,