伽马蜡烷--水体分层的地球化学标志

密执安盆地等海相蒸发环境伽马蜡烷的分布表明，伽马蜡烷作为咸水环境的生物标志化合物与高盐度环境并没有绝对的对应关系；松辽盆地淡水－微咸水环境较高含量的伽马蜡烷表明其形成与湖海沟通引起的水体分层事件有关。伽马蜡烷重碳同位素值及微生物学证据均表明了伽马蜡烷的形成与水体分层有关，由于高盐环境往往伴随着密度分层，从而解释了伽马蜡烷经常与高盐环境伴生，但并不仅仅局限于高盐环境的现象。

Gammacerane-Geochemical Indicator of Water Column Stratification

Distribution of gammacerane in some marine evapo ritic environments such as Michigan basin shows that gammacerane, a hy persaline biomarker, is not absolutely associated with hy persaline envi ronment ;Relative higher concent ration of g ammacerane in Song liao fresh-brackish lacustrine envi ronment is connected w ith water column stratification caused by event of linking between lacust rine and sea. Both stable carbon isotopic compositions of gammacerane and microbiology indicate that the formation of gammacerane is related to water column strat if ication.Since water columns in hypersaline depositional environments are of ten density st ratified, it explains w hy g ammacerane is of ten found in sediments deposi ted under hypersaline conditions but is not necessarily restricted in this type of deposits.