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首页> 外文期刊>Geo-marine letters >Elevated turbidity and dissolved manganese in deep water column near 10 degrees 47'S Central Indian Ridge: studies on hydrothermal activities
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Elevated turbidity and dissolved manganese in deep water column near 10 degrees 47'S Central Indian Ridge: studies on hydrothermal activities

机译：深水柱升高的浊度和溶解锰在10度47的中央印度山脊附近：水热活动研究

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摘要

The deep water in the ridge segment between 10 degrees 18'S and 10 degrees 57'S of northern Central Indian Ridge was surveyed with CTD and AUV for seafloor hydrothermal activities. During the survey, 25 CTD hydrocasts were made, and seawater samples were collected for analyses of chemical tracers like dissolved manganese (DMn). In the rift valley between 10 degrees 40'S and 10 degrees 57'S, consistent backscatter anomalies (up to 0.013 Delta NTU) were found in deep water, indicating excess of suspended particulate at the depth between 3050 and 3500 m. The seawater samples from this turbid layer was characterized with high concentration of dissolved manganese (maximum DMn = 39 nmol/L) and excess helium-3 (maximum delta He-3 = 17.1%) and thus confirmed the possible hydrothermal activities in that area. The distribution of turbidity and DMn in deep water apparently suggests that there could be active vent(s) located close to the eastern wall (10 degrees 47.5'S; 66 degrees 38.6'E) of the valley, near southern end of the ridge segment. The physiochemical characters of the plume suggest the source fluid might have originated from reactions involving both mafic and ultramafic rocks, and its nature is comparable to other plumes in the Indian Ocean.
机译：用CTD和AUV北部18岁的北部18岁和10度57的山脊段的深水与海底热热活动进行调查。在调查期间，制备了25个CTD的加氢液，并收集了海水样品，用于分析溶解锰（DMN）。在10度40和10度57之间的裂谷中，在深水中发现一致的反向散射异常（最多0.013 delta NTU），在3050和3500μm之间表示过量的悬浮颗粒。来自该混浊层的海水样品具有高浓度的溶解锰（最大DMN = 39nmol / L）和过量的氦-3（最大δHe-3 = 17.1％），从而证实了该区域的可能水热活性。深水中浊度和DMN的分布显然表明，可能存在靠近东部墙壁（10度47.5's; 66度38.6，66度38.6'e）的山谷附近的活动通风口，靠近山脊段。羽流的物理化学特征表明源流体可能源于涉及MAFIC和超空地岩石的反应，其性质与印度洋中的其他羽毛相当。

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