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海水中的氦同位素能对海底热液活动进行有效示踪。本文对在西南印度洋49°~56°E洋脊段采集的5条CTD拖曳剖面共14件深水样品进行了氦氖同位素分析。通过分析水体中存在的氦同位素异常,探讨调查区热液异常的特征和热液羽状流的分布。分析表明,5条CTD剖面均存在δ3He异常,其中CTD7-2(位置:37.927°S、49.412°E,水深2 140m,离底高度100m)的δ3He值最大,达到49.2%。根据δ3He分布特征,认为调查区内存在至少6处热液羽状流,其中37.927°S、49.412°E以西数千米范围内可能存在海底热液喷口。
Helium isotopes in seawater can effectively trace seafloor hydrothermal activity. In this paper, 14 deep-water samples collected from 5 CTD drag sections in the ridges of 49 ° -56 ° E in the Southwest Indian Ocean were analyzed for helium-neon isotope analysis. By analyzing the helium isotopic anomalies existing in water, the characteristics of hydrothermal anomaly and the distribution of hydrothermal plume are discussed. The results show that the δ3He anomaly exists in all five CTD sections. The δ3He value of CTD7-2 (position 37.927 ° S, 49.412 ° E, water depth 2140m and basement height 100m) is the largest, reaching 49.2%. According to the δ3He distribution, it is considered that there are at least 6 hydrothermal plumes in the survey area, of which hydrothermal vents may exist within a few kilometers of 37.927 ° S and 49.412 ° E.