Petrographic characteristics of authigenic carbonates from Jiulong methane reef of northern South China Sea
南海北部陆坡九龙甲烷礁冷泉碳酸盐岩沉积岩石学特征

The authors report on the mineralogical features and carbon-oxygen isotope composition of the authigenic carbonates build-up of Samples TVG-1 and TVG-11 from Jiulong methane reef in the South China Sea.The results by XRD confirm that the samples are composed of miscellaneous carbonates,including aragonite,Mg-calcite and dolomite,while detrital minerals are less abundant.In Sample TVG-1,aragonite is replaced by calcite and the pseudomorph of the former is observed,suggesting that this sample was formed earli...