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引言 古代碳酸岩的稳定同位素研究一直是主要用来确定沉积或成岩环境的。氧同位素记录已成为研究更新世地层学的重要工具之一(Savin,1977)。此外,~(18)O同位素纪录已成为地层划分和对比的依据。碳同位素数据只是最近才被提出来作为一种研究地层学的工具(Scholle等,1980)。研究表明,在整个显生宙都存在碳同位素的短期波动,其中有些波动被认为是全球性事件,它反映了地壳碳循环的变化,在某些情况下这可能与海退、海进旋回以及整个
Introduction Stable isotope studies of ancient carbonates have been used primarily to determine sedimentary or diagenetic environments. Oxygen isotope recording has become one of the most important tools for studying Pleistocene (Savin, 1977). In addition, the records of ~ (18) O isotopes have become the basis of stratigraphic division and contrast. Carbon isotope data have only recently been proposed as a tool for studying stratigraphy (Scholle et al., 1980). Studies show that there are short-term fluctuations in carbon isotopes throughout the Phanerozoic, some of which are considered global events and reflect variations in the crustal carbon cycle, which in some cases may be related to regression, transgressive cycles, entire