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本文通过对湖南晚二叠世生物礁中的有关胶结物及岩石的碳、氧稳定同位素研究,并结合薄片观察、探针成分分析、包裹体测温等,探讨了该地区生物礁成岩作用中的有关成岩特征。研究认为:①湖南晚二叠世生物礁中胶结物从早期至晚期δ~(13)C和δ~(18)O值总体上均有变轻的趋势,反映了礁体为一连续埋藏的成岩过程;②生物礁中所见白云石化现象主要属埋藏压实成因,礁体基本未受早期淡水或混合水影响;③礁中粗晶方解石胶结物形成于深埋期,但湘南和湘西生物礁被深埋的程度却有明显差别。
In this paper, carbon and oxygen stable isotopes of cements and rocks in the Late Permian reefs in Hunan Province are studied. Combined with the observation of thin sections, probe composition analysis and temperature measurement of inclusions, the paper discusses the diagenesis of reefs The diagenetic features. The results show that: (1) The cements in the Late Permian reefs in Hunan show a trend of decreasing light from the early to the late stage, and the values of δ ~ (13) C and δ ~ Diagenetic process; ② The phenomenon of dolomitization seen in the reef mainly belongs to the genesis of burial compaction, and the reef body is basically not affected by early freshwater or mixed water; ③ The coarse grained calcite cement formed in the deep burial period in the reef, The depth of reefs are buried there are significant differences.