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冷泉碳酸盐岩记录了甲烷渗漏活动和流体组分随时间的变化过程,对示踪冷泉系统沉积环境变化具有非常重要的意义.对南海北部获取的冷泉碳酸盐岩进行了碳、氧同位素剖面研究,并对南海北部冷泉碳酸盐岩的碳、氧同位素变化范围进行了统计分析.研究结果及已发表的δ13 C和δ18 O剖面数据表明,南海北部冷泉碳酸盐岩剖面的δ13 C和δ18 O之间普遍存在相关性,相关系数R2最高可达0.933 1.经统计,南海北部冷泉碳酸盐岩样品δ13 C和δ18 O均具有较大的变化范围,其最大变化分别为34.50×10-3和5.89%(Vienna Pee Dee Belemnite,V-PDB).冷泉碳酸盐岩δ13 C和δ18 O的相关性特征可能指示了初始流体的变化、后期矿物形成/重结晶作用、渗漏系统较为复杂或者成岩作用等环境变化信息.对不同碳酸盐岩样品来说,δ13 C的变化主要由海水的参与程度决定,而δ18 O的变化可能与温度和Mg元素参与方解石沉淀的程度有关.
Cold Spring Carbonate records the process of methane leakage and the change of fluid composition with time, which is of great significance to the change of sedimentary environment of traced cold spring system.Carbon and oxygen Isotopic profiles and statistical analysis of carbon and oxygen isotopic variation of cold spring carbonate rocks in the northern South China Sea.The results of the study and the published δ13C and δ18O profiles show that the δ13C values of the cold spring carbonate rocks in the northern South China Sea C and δ18 O, the correlation coefficient R2 can reach as high as 0.933 1. According to the statistics, δ13 C and δ18 O of the Cold Spring carbonate samples in the northern South China Sea all have large variation range, the maximum change is 34.50 × 10-3 and 5.89% (Vienna Pee Dee Belemnite, V-PDB) .Correlation characteristics of δ13C and δ18O in cold spring carbonate rocks may indicate the variation of initial fluid, late mineralization / recrystallization, leakage System complexity or diagenesis etc. For different carbonate samples, the δ13C changes are mainly determined by the degree of seawater participation, while the δ18O changes may be related to the temperature and Mg elements involved parties The degree of calcite precipitation.