利用湖泊自生碳酸盐岩氧碳同位素特征分析古湖泊类型的方法——实际应用中的要点及分析程式

METHODS OF USING CARBON-OXYGEN ISOTOPIC CHARACTERISTICS OF LACUSTRINE AND AUTHIGENIC CARBONATES TO ANALYZE TYPES OF PALEOLAKES:PROBLEMS NEEDING ATTENTION,THE ESSENTIAL POINTS, ANALYTICAL PROGRAMS IN PRACTICAL APPLICATION

以文献资料为素材,讨论了湖泊自生碳酸盐岩样品构成中岩性成分、采样点分布及数据量对样品氧碳同位素相关性及其能否反映古湖泊氧碳同位素相关性影响,指出根据相关性分析古湖泊类型时,必须充分考察样品岩性成分一致性、地质层位同一性、地质及地理分布合理性,着重考察样品数据量的充足性.综述了利用湖泊自生碳酸盐岩氧碳同位素特征分析古湖泊类型的方法,提出"一氧、二碳、三相关、四综合"的基本分析程式.

On the basis of documentary data,what is firstly discussed is the impact of carbonate sample-composition such as lithological composition,distribution of sampling spots and data bulk on correlation between δ13C and δ18O of samples,and on that such correlation can/can＇t truly display the objective carbon-oxygen isotopic correlation of paleolakes.And it is pointed out that the consistency of lithological composition,the identity of geological strata-position,the rationality of both geological and geographical distribution must be sufficiently studied,and the adequacy of the amount of samples data must be inspected in particular during analysis of paleolake types.Then the essential points and keys of methods of using carbon-oxygen isotopic characteristics of authigenic carbonates to analyze the types of paleolakes are synthetically detailed,and the fundamental analysis program of ＂first δ18O,second δ13C,third correlation,forth integration＂ is put forward.