• Login
    View Item 
    •   Home
    • Theses & Dissertations
    • 2021 - Mines Theses & Dissertations
    • View Item
    •   Home
    • Theses & Dissertations
    • 2021 - Mines Theses & Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of Mines RepositoryCommunitiesPublication DateAuthorsTitlesSubjectsThis CollectionPublication DateAuthorsTitlesSubjects

    My Account

    Login

    Mines Links

    Arthur Lakes LibraryColorado School of Mines

    Statistics

    Display Statistics

    Shallow-water geothermal activity offshore Panarea, Aeolian island arc, Italy

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Pascarelli_mines_0052N_12128.pdf
    Size:
    4.973Mb
    Format:
    PDF
    Download
    Author
    Pascarelli, Samantha
    Advisor
    Monecke, Thomas
    Date issued
    2021
    Keywords
    geothermal
    shallow-submarine
    volcano
    Panarea
    Aeolian
    sulfides
    
    Metadata
    Show full item record
    URI
    https://hdl.handle.net/11124/176406
    Abstract
    Panarea island represents a partially emerged arc volcano forming part of the Aeolian volcanic chain in the southern Tyrrhenian Sea. The island rises from the western sector of a submarine platform representing the eroded summit of a large submarine stratovolcano. Seafloor observations on the eastern portion of the submarine platform have been conducted using a remotely operated vehicle. The seafloor survey resulted in the discovery of a new field of hydrothermal venting between the Secca dei Panarelli and Basiluzzo islet that is typified by quiescent gas venting and the discharge of thermal waters at water depths ranging from 60 to 100 m. The geothermal activity is associated with a wide range of seafloor morphological features, many of which are transient in nature and will not likely be preserved in the geological record. This includes widespread anhydrite-gypsum deposits that have been drilling to a maximum penetration of 5 m below seafloor using a lander-type drilling device. The massive to brecciated hydrothermal deposits contain > 80 % anhydrite and gypsum in addition to alteration minerals formed during subseafloor replacement and infiltration of the volcaniclastic host. Advanced-argillic alteration of the volcaniclastic material under acidic conditions resulted in the formation of kaolinite, with variable amounts of alunite, boehmite, and barite being present, whereas argillic alteration at near-neutral conditions caused smectite and rhodochrosite formation. Minor amounts of sulfide minerals, including pyrite, marcasite, sphalerite, and galena. The deposits show an enrichment of Ag, As, Cd, Hg, Pb, and Zn, attesting to the metal-carrying capacity of the thermal liquids. The isotopic composition of the sulfate minerals suggests that the anhydrite-gypsum deposits were formed by a mixture between thermal waters and seawater at temperatures of 132‒170⁰C. A model for fluid evolution of the Panarea hydrothermal field suggests mixing of an upwelling thermal liquid with shallow circulating seawater. Heating of seawater during mixing triggered the precipitation of anhydrite, which subsequently partly converted to gypsum. The thermal liquids likely contained volatiles derived from a magmatic source. The formation of massive sulfate deposits in shallow water on a partially emergent arc volcano make Panarea a distinct new type of seafloor hydrothermal system.
    Rights
    Copyright of the original work is retained by the author.
    Collections
    2021 - Mines Theses & Dissertations

    entitlement

     
    DSpace software (copyright © 2002 - 2022)  DuraSpace
    Quick Guide | Contact Us
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.