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首页> 外文期刊>Geophysical Research Letters >Detection of hydrothermal plumes along the Southeast Indian Ridge near the Amsterdam-St Paul plateau
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Detection of hydrothermal plumes along the Southeast Indian Ridge near the Amsterdam-St Paul plateau

机译：在阿姆斯特丹圣保罗高原附近的东南印度洋脊上发现热液羽流

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摘要

A new self-contained profiling instrument, attached to 91 lowerings of waxcores and dredges along a 1600 km stretch of the Southeast Indian Ridge, found six sites having optical back-scatter anomalies indicative of hydrothermal plumes from high-temperature seafloor venting. At five other sites, back-scatter anomalies were less distinct, and at the remaining sites, anomalies were absent. These are the first documented hydrothermal sites along this intermediate-rate spreading center and are among the very few yet discovered in the Indian Ocean basin. Some profiles complex back-scatter anomalies suggestive of sources of seafloor discharge. At one site, near bottom temperature anomalies of similar to 0.1 degrees C and the recovery of a vent-specific barnacle provide the first precise seafloor location of active venting in the deep Indian Ocean. Although this study is only reconnaissance in nature, venting along this portion of the SEIR appears to be significantly less than predicted by global correlations of plume incidence as a function of spreading rate. Nevertheless, these sites may be important as biological connections between distinct faunal assemblages of Atlantic and Pacific vent fields. [References: 17]
机译：一种新的自包含轮廓仪，沿着东南印度洋脊1600公里延伸段上的91个蜡芯和挖泥机下降装置，发现六个站点具有光学反向散射异常，这些异常指示高温海底通风产生的热液羽流。在其他五个站点，后向散射异常不太明显，而在其余站点，则没有异常。这些是该中速扩散中心的第一个有记录的热液场，也是印度洋盆地中极少数发现的热液场。一些剖面复杂的背向散射异常暗示了海底排放的来源。在一个地点，接近底部温度异常（接近0.1摄氏度）和特定于通风孔的藤壶的恢复为印度洋深处的主动通风提供了第一个精确的海底位置。尽管这项研究仅是侦查性质的，但沿着SEIR的这一部分的排气似乎远少于通过羽流发生率与扩散速度的全球相关性进行的预测。然而，这些位置可能是重要的，因为大西洋和太平洋喷口场的不同动物群落之间存在生物学联系。 [参考：17]

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