Heat-flow and near-seafloor magnetic anomalies highlight hydrothermal circulation at Brothers Volcano (southern Kermadec Arc)

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Author(s): Caratori Tontini, Fabio; Tivey, Maurice; de Ronde, Cornel E. J.; Humphris, Susan E.
Author Affiliation(s): Primary:
GNS Science, Lower Hutt, New Zealand
Woods Hole Oceanographic Institution, United States
Volume Title: AGU 2018 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2018; American Geophysical Union 2018 fall meeting, Washington, DC, Dec. 10-14, 2018. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: Brothers volcano is arguably more hydrothermally active than any other volcano along the Kermadec arc, with three hydrothermal fields located on the caldera walls and two hydrothermal fields on the Upper and Lower cones, respectively. These sites show different types of hydrothermal activity in terms of temperature, chemistry and associated mineralization, representing windows into the complicated hydrothermal systems that are associated with submarine arc volcanoes. For these reasons, the Brothers volcano hydrothermal system was recently drilled by the International Ocean Discovery Program (IODP). Here we show the results of a systematic heat-flow survey at Brothers carried out during the recent TN350 cruise utilising the R/V Thompson, by deploying thermal blankets in combination with the Remotely Operated Vehicle (ROV) Jason heat-flow probe. These data were integrated with thermal blankets data acquired during the SO253 cruise onboard the R/V Sonne by using the ROV Marum-Quest 4000 m. In addition, near-seafloor magnetic data were acquired from the ROV Jason magnetometer and integrated with pre-existing data collected by the Autonomous Underwater Vehicle (AUV) Sentry. Preliminary heat flow results show very low to negative heat flux across the caldera floor suggesting possible recharge while the upper cone and lower cone active vent areas show high heat flux values (>10 W/m2) respectively. The active vent area around the northwest caldera region shows the highest heat flux (>40 W/m2). The complete distribution of heat flow measurements along with the patterns of magnetization will be used to inform models of hydrothermal circulation at Brothers volcano providing an essential framework in which to place the future IODP results.
Year of Publication: 2018
Research Program: IODP2 International Ocean Discovery Program
Key Words: 07 Marine Geology and Oceanography; Brothers Volcano; Heat flow; Hydrothermal conditions; Hydrothermal vents; International Ocean Discovery Program; Kermadec Islands; Magnetic anomalies; Magnetic properties; Marine sediments; Sediments; Volcanoes; West Pacific Ocean Islands
Record ID: 2019050476
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States

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