Environmental Changes in Methane Seeps Recorded by Carbon and Oxygen Isotopes in the Northern South China Sea
Yang Kehong
Yu Xiaoguo
Chu Fengyou
Dong Yanhui
Abstract：Cold seep carbonates record the changes of fluids and environments in the methane seepages,which is important to reveal the sedimentary environment changes.The carbon and oxygen isotope profiles of the northern South China Sea and their vary intervals were studied.The results show that there are correlations betweenδ1 3 C andδ1 8 O along the profiles.Combined with the publishedδ1 3 C andδ1 8 O data,it is suggested that the correlations between them along the profiles are common,with the maximum correlation coefficient R 2 of 0.933 1.Accroding to the statistics results,both theδ1 3 C andδ1 8 O vary greatly for the cold seep carbonates in the northern South China Sea,which maximal varing interval can be 34.50×10 -3 and 5.89%(Vien-na Pee Dee Belemnite,V-PDB),respectively.The correlations betweenδ1 3 C andδ1 8 O along the profiles perhaps indicate the changes of original fluids,the mineral formation or recrystallization,the complex methane seep systems and the diagenetic effects.For different cold seep carbonates,the vary intervals ofδ1 3 C were influenced by the participation degree of seawater, and the vary intervals ofδ1 8 O perhaps were related with the precipitation temperature and the Mg of calcite.
Keywords：isotopemethane seepcold seep carbonatethe northern South China Seaenvironmental geology
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1206-1215 )