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Chemical compositions and precipitation timing of basement calcium carbonate veins from the South China Sea
Ding, WW; Chen, YF; Sun, Z; Cheng, ZH; yfchen@gig.ac.cn
2018
Source PublicationMARINE GEOLOGY
Volume394Pages:116-124
AbstractSixteen calcium carbonate veins (CCVs) within the igneous basement recovered from both East and Southwest Sub-basin, close to the fossil spreading ridge of the South China Sea during the Integrated Ocean Drilling Program (IODP) Expedition 349 were investigated. The CCVs are composed primarily of either calcite or aragonite, and some of mixed aragonite and calcite. The delta O-18 values of CCVs range from 25.5 to 31.8%o VSMOW, indicating these are typical low temperature basement carbonates precipitated at temperatures of 12-40 degrees C. The Sr-87/Sr-86 ratios of CCVs from Site U1431 show a strong negative correlation with delta O-18-calculated temperatures, regardless of carbonate phases calcite or aragonite, indicating CCVs with lower Sr-87/Sr-86 ratios have precipitated from moderately warmer and more geochemically evolved hydrothermal fluids, and reflecting that precipitation of CCVs might have occurred any time between 14.5 and 0 Ma at Site U1431. The formation timing of CCVs at Site U1431 is consistent with the ongoing hydrothermal flow and circulation led by recharging seawater into the volcanic basement through the nearby outcropped seamount. The oldest ages of CCVs from Site U1433 at the Southwestern sub-basin of SCS were determined to be similar to 18-11 Ma, based on basement age of 18.5 Ma and the well-established seawater Sr-87/Sr-86 ratio curve. It indicates that the hydrothermal circulation at Site U1433 which is more distal to a recharging/discharging site was only active until similar to 11 Ma. In consequence, the CCVs within basalts from Sites U1431 and U1433 provide more insights into the past hydrologic conditions and hydrothermal circulation along the fossil ridge flank in the SCS.
Department[Ding, Weiwei] State Ocean Adm, Inst Oceanog 2, Hangzhou 310012, Zhejiang, Peoples R China; [Ding, Weiwei; Cheng, Zihua] Zhejiang Univ, Sch Earth Sci, Hangzhou 310027, Zhejiang, Peoples R China; [Chen, Yifeng] Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510640, Guangdong, Peoples R China; [Sun, Zhen] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
Subject AreaGeology ; Oceanography
WOS KeywordCalcium carbonate veins ; Low temperature basement carbonates ; Sr-87/Sr-86 ratios ; Precipitation timing ; The South China Sea ; IODP expedition 349
Funding ProjectMSG
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17166
Collection中科院边缘海地质重点实验室
Corresponding Authoryfchen@gig.ac.cn
Recommended Citation
GB/T 7714
Ding, WW,Chen, YF,Sun, Z,et al. Chemical compositions and precipitation timing of basement calcium carbonate veins from the South China Sea[J]. MARINE GEOLOGY,2018,394:116-124.
APA Ding, WW,Chen, YF,Sun, Z,Cheng, ZH,&yfchen@gig.ac.cn.(2018).Chemical compositions and precipitation timing of basement calcium carbonate veins from the South China Sea.MARINE GEOLOGY,394,116-124.
MLA Ding, WW,et al."Chemical compositions and precipitation timing of basement calcium carbonate veins from the South China Sea".MARINE GEOLOGY 394(2018):116-124.
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