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，由"南方探索者号"（RV Southern Surveyor）在汤加及东劳盆地执行TELVE航次（SS02/03）时所记录的地球科学数据。此类数据涵盖记录的测站坐标，以及拖网取样、温盐深仪（CTD）/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航次共计完成70次拖网取样、31次拖曳式温盐深测量（tow-yos）、14次垂直水文剖面测量、9条回声测深剖面、2次摄像拖曳作业以及1次浮标曳航试验。
本航次的核心科学目标为研究托富阿弧（Tofua Arc）及毗邻的瓦卢法弧后脊（Valu Fa back arc Ridge）的热液羽流活动，并结合抓斗与拖网开展海底取样作业。取样工作沿瓦卢法脊轴、以及约南纬21°30′至24°10′之间的托富阿弧展开，同时在南纬约22°30′处完成了一条从弧后盆地至火山弧区域的横向热液剖面测量。
本航次的具体目标包括：
1. 沿瓦卢法弧后扩张脊的三段连续开展轴向上的热液活动普查；
2. 在条件允许的前提下，沿毗邻瓦卢法脊的南汤加弧开展系统性热液活动普查；
3. 首次对比分析毗邻弧后脊与火山弧区段的热液喷口发育情况及其流体化学特征；
4. 与预定在劳弧后扩张脊更北段开展同类普查的RIDGE 2000项目研究人员协同共享弧后脊普查成果。