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<p>During the hydrothermal sulphide exploration survey (May - June 2020), an anomalously thick plume was detected in the water column over the Central Indian Ridge, a divergent plate boundary north of the Rodriguez Triple Junction in the Indian Ocean. Conductivity, temperature and depth (CTD) profiles identified the 900&#xa0;m thick anamolous layer, characterized by a pronounced drop in redox potential and elevated turbidity. The height and diameter of the turbid layer are similar to the previously identified event plumes over mid oceanic ridges (e.g., the Gorda Ridge and Juan de Fuca Ridge, spreading ridges in the western offshore of the Americas). The plume was located within a seismically active ridge segment, as indicated by the global earthquake data. Between April and June 2020, 38 earthquakes were recorded in this region, including a major Mw 5.7 event at 23°40’S, the most significant event observed during the past ten years. The temporal correlation between the seismic swarm and the observed event plume indicates rapid mobilization of heat and hydrothermal fluids, most likely triggered by a diking event associated with magmatic activity at the divergent plate boundary. These findings represent the second documented event plume ever in the Indian Ocean.</p>

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Hydrothermal event plume at 23°10’S central Indian Ridge, Indian Ocean

  • 期刊论文

  • 发表日期：

    2025年10月20日

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  • Srinivas Rao Arvapalli,
  • K. A. Kamesh Raju,
  • Koichi Nakamura,
  • Sunil Vadakkepuliyambatta

摘要

During the hydrothermal sulphide exploration survey (May - June 2020), an anomalously thick plume was detected in the water column over the Central Indian Ridge, a divergent plate boundary north of the Rodriguez Triple Junction in the Indian Ocean. Conductivity, temperature and depth (CTD) profiles identified the 900 m thick anamolous layer, characterized by a pronounced drop in redox potential and elevated turbidity. The height and diameter of the turbid layer are similar to the previously identified event plumes over mid oceanic ridges (e.g., the Gorda Ridge and Juan de Fuca Ridge, spreading ridges in the western offshore of the Americas). The plume was located within a seismically active ridge segment, as indicated by the global earthquake data. Between April and June 2020, 38 earthquakes were recorded in this region, including a major Mw 5.7 event at 23°40’S, the most significant event observed during the past ten years. The temporal correlation between the seismic swarm and the observed event plume indicates rapid mobilization of heat and hydrothermal fluids, most likely triggered by a diking event associated with magmatic activity at the divergent plate boundary. These findings represent the second documented event plume ever in the Indian Ocean.