Barium fronts in core sediments from northern slope of the South China Sea and its implication for decomposition of gas hydrate

Meng Xianwei; Zhang Jun; Xia Peng

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Meng Xianwei, Zhang Jun, Xia Peng. Barium fronts in core sediments from northern slope of the South China Sea and its implication for decomposition of gas hydrate[J]. Haiyang Xuebao, 2014, 36(2): 33-39.

Citation:

Meng Xianwei, Zhang Jun, Xia Peng. Barium fronts in core sediments from northern slope of the South China Sea and its implication for decomposition of gas hydrate[J]. Haiyang Xuebao, 2014, 36(2): 33-39.

Citation:

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Barium fronts in core sediments from northern slope of the South China Sea and its implication for decomposition of gas hydrate

First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China

Received Date: 2013-01-23

Abstract

Abstract

Barium cycling in deep-sea sediments,especially those of the areas where gas hydrate occurs,is controlled by redox between sulfate and methane within a sediment-interstitial water system. "Barium fronts" occurring in deep-sea sediments,therefore,are generally related to decomposition of gas hydrate. 4 "Barium fronts" were recognised from sediments of upper section (0-185 m). Each of them exactly corresponded to sulfate-methane interface,decrease in chlorin flux and glacial-interglacial transition,indicating that during glacial ages,gas hydrate in shallow regions,such as Dongsha Archipelago seabed would decompose due to decease in sea level stands,releasing fluids lower salinity and higher methane concentration. Some of the released fluid would laterally migrate into ODP1146 site,resulting in sulfate depletion to zero and excess barium accumulation to maximum at glacial terminations; meanwhile,some of the released fluid would migrate into air,accelerating glacial age end due to greenhouse effect of methane. Impacted by glacial-interglacial cycles over the past 500 ka,the fluids with lower salinity and higher methane,released by decomposition of gas hydrate from shallow areas,such as Dongsha archipelago,would vary in oscillatory way,resulting in burying of multiple "barium fronts" in sediments. The "barium fronts" can be used as a proxy for assesment of variation in methane flux released by decomposition of gas hydrate.
- northern slope of the South China Sea,
- barium cycling,
- barium front,
- decomposition of gas hydrate,
- glacial-interglacial cycle

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References(26)

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