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Magnetic measurements and organic geochemical analyses (TOC,TS) were conducted on recent tidalflat sediments from Feng-Xian (FX) and Bei-Bu-Gang (BBG) of the Yangtze coast,and on Holocenetidal flat sediments from core SL67 on the southern Yangtze delta plain,China.The results showedthat greigite formed in the upper tidal flat sediments of FX and BBG,where TOC and TS enriched.