• Login
    View Item 
    •   DSpace Home
    • Institute's contributions
    • Scholarly literature
    • View Item
    •   DSpace Home
    • Institute's contributions
    • Scholarly literature
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Millennial-Scale Hydrothermal Variability at the Carlsberg Ridge Driven by Sea-Level Change and Transient Magmatism

    Thumbnail
    Date
    2025
    Author
    De, S.
    Singh, S.K.
    John, R.
    Metadata
    Show full item record
    Abstract
    Hydrothermal systems at mid-ocean ridges (MORs) mediate the transfer of heat and geochemical fluxes from the mantle to the hydrosphere, facilitating fluid-rock interaction and metal cycling. While short-term hydrothermal dynamics are well studied, the long-term response of these systems at slow-spreading ridges to glacial-interglacial sea-level change remains poorly constrained. Here, we measured Pb isotope ratios and trace metal concentrations (Co, Ni, Cr) in authigenic Fe Mn oxyhydroxide coatings from sediment core SSD77-GC03, recovered from the Carlsberg Ridge, to reconstruct hydrothermal activity over the past 49 kyr. Pb isotope compositions of basalt fragments were also analyzed to constrain the local hydrothermal end-members. The Fe Mn coating data delineate six discrete hydrothermal events (HY1 HY6), revealing two distinct modes of sea-level forcing. Events HY4 HY6 (?46 36 ka) follow the Marine Isotope Stage (MIS) 4 sea-level lowstand and reflect a delayed, melt-driven hydrothermal response, consistent with decompression-induced mantle melting and subsequent magma ascent. In contrast, events HY1 HY3 coincided with rapid sea-level falls during the MIS 3 2 transition and Last Glacial Maximum (LGM ? 24 22 ka), and reflect a hybrid mechanism in which fault-enhanced permeability and transient magmatic heat sustained hydrothermal discharges. These dual mechanisms highlight the sensitivity of hydrothermal systems to both mantle melting and upper crustal stress reconfiguration driven by sea-level change. During these events, trace metal enrichments in authigenic coatings indicate enhanced trace metal fluxes to the deep Indian Ocean. Our findings demonstrate that hydrothermal systems at slow-spreading ridges respond dynamically to sea-level forcing and modulate deep-ocean chemistry over glacial-interglacial cycles.
    URI
    https://doi.org/10.1029/2025GC012552
    http://drs.nio.res.in/drs/handle/2264/9570
    Collections
    • Scholarly literature [9211]

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV
     

     

    Browse

    All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV