TELVE Geoscientific Data 2003

This dataset contains geoscientific data logged during TELVE cruise (SS02/03) on RV Southern Surveyor 14.3-3.4.2003 in Tonga and Eastern Lau Basin. These data include logged station coordinates and information for dredges, CTD/hydrocasts, echosounder and camera/video operations and geological samples. The TELVE expedition completed 70 dredges, 31 tow-yos, 14 vertical hydrocasts, 9 echo-sounding traces, 2 camera tows, and 1 drogue test. The major scientific objectives of the cruise were a study of the hydrothermal plume activity of the Tofua Arc and adjacent Valu Fa back arc Ridge coupled with sampling of the sea floor with grabs and dredges. Sampling was conducted along the axis of the Valu Fa Ridge, the Tofua Arc between about 21o 30” and 24o 10’S, and one transverse hydrothermal cast from the backarc to arc region at ~ 22o 30’S was done. More specifically, objectives of the voyage were: 1.Perform a continuous along-axis survey for hydrothermal activity along the three segments of the Valu Fa back arc spreading ridge. 2. To the extent possible, conduct a systematic survey for hydrothermal activity along the S. Tonga arc adjacent to the Valu Fa Ridge. 3. Compare (for the first time) the incidence and chemistry of hydrothermal emissions along the adjacent back arc ridge and volcanic arc sections. 4. Coordinate results of back arc ridge survey with RIDGE 2000 investigators slated to perform similar surveys further north on Lau back arc spreading ridges.

本数据集包含2003年3月14日至4月3日期间，搭载“南方考察者”号（RV Southern Surveyor）在汤加（Tonga）与东劳盆地（Eastern Lau Basin）执行的TELVE航次（TELVE cruise，SS02/03）所记录的地球科学数据。
该数据集涵盖各测站的记录坐标，以及拖网采样、CTD（温盐深仪）/水文剖面测量、回声测深、摄像/视频作业与地质样品的相关信息。
本次TELVE航次共完成70次拖网采样、31次拖曳走航剖面测量、14次垂直水文剖面测量、9条回声测深测线、2次摄像拖曳作业以及1次漂流浮标试验。
本航次的核心科学目标为研究托富阿弧（Tofua Arc）及其毗邻的瓦卢法弧后脊（Valu Fa back arc Ridge）的热液羽流活动，并利用抓斗与拖网开展海底采样。采样工作覆盖瓦卢法脊轴部与南纬约21°30′至24°10′区间内的托富阿弧，并完成了一次位于南纬约22°30′处、从弧后区至弧区的横向热液剖面测量。
具体而言，本次航次的科学目标包括：1. 对瓦卢法弧后扩张脊的三段区段开展沿轴连续热液活动调查；2. 在可行范围内，对毗邻瓦卢法脊的南汤加弧沿线开展系统性热液活动调查；3. 首次对比分析毗邻弧后脊与火山弧区段的热液喷口分布特征与流体化学组成；4. 与计划在劳弧后扩张脊更北段开展同类调查的脊2000计划（RIDGE 2000）研究者协调弧后脊调查成果。