SCSIO OpenIR  > 中科院边缘海地质重点实验室
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
发表期刊MARINE GEOLOGY
卷号394页码:116-124
摘要Sixteen 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.
部门归属[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
学科领域Geology ; Oceanography
关键词[WOS]Calcium carbonate veins ; Low temperature basement carbonates ; Sr-87/Sr-86 ratios ; Precipitation timing ; The South China Sea ; IODP expedition 349
资助项目MSG
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/17166
专题中科院边缘海地质重点实验室
通讯作者yfchen@gig.ac.cn
推荐引用方式
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.
条目包含的文件
文件名称/大小 文献类型 版本类型 开放类型 使用许可
Chemical composition(994KB)期刊论文作者接受稿开放获取CC BY-NC-SA请求全文
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。