Abstract The late Neogene marls from the Lorca, Murcia and Vera basins in S-E. Spain contain abundant dolomite nodules that were formed due to intense methane-rich fluid migration. The pathways for these fluids are evidenced by dense networks of fractures that are crossing the sedimentary layers and eventually the dolomite nodules. The fractures are generally filled by secondary fibrous gypsum that form veins of a few cm thick. The oxygen and sulfur isotopic compositions of the gypsum veins exhibit wide ranges (−2.2

中文翻译：

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与西班牙东南部新近纪泥灰岩成岩白云岩结核相关的石膏脉的起源

摘要 来自东南部 Lorca、Murcia 和 Vera 盆地的晚新近纪泥灰岩。西班牙含有丰富的白云岩结核，这些结核是由于强烈的富含甲烷的流体迁移而形成的。穿过沉积层并最终穿过白云岩结核的密集裂缝网络证明了这些流体的路径。裂缝通常由次生纤维石膏填充，形成几厘米厚的脉。石膏脉的氧和硫同位素组成范围很广（-2.2