• Login
    View Item 
    •   Home
    • Theses & Dissertations
    • 2018 - Mines Theses & Dissertations
    • View Item
    •   Home
    • Theses & Dissertations
    • 2018 - 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

    Small scale gravity anomalies observed in GRAIL gravity data

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Jansen_mines_0052E_11446.pdf
    Size:
    6.649Mb
    Format:
    PDF
    Download
    Author
    Jansen, Johanna C.
    Advisor
    Andrews-Hanna, Jeffrey C.
    Date issued
    2018
    Keywords
    inversion
    Orientale
    gravity
    small-scale
    moon
    
    Metadata
    Show full item record
    URI
    https://hdl.handle.net/11124/172158
    Abstract
    The Gravity Recovery and Interior Laboratory (GRAIL) data has revealed an unparalleled high-resolution gravity map of the Moon. This high-resolution data enables us to look at small-scale (10’s of km) shallow gravity anomalies and attempt to interpret them in terms of density. In chapter 2 the background variability is investigated and explained by using gravity inversions to model the small-scale three-dimensional variations in the density of the lunar crust. In an attempt to explain the density variations, we interpret them in terms of three end-member scenarios of variations in porosity, intrusions into the crust, and variations in bulk crustal composition. Though it is most likely that all three end-member scenarios contribute to the background variability, we find that the density anomalies can be caused entirely by changes in porosity. In chapter 3 we investigate small-scale gravity anomalies radiating out from the Orientale basin, shown in GRAIL data. These radial gravity lineations are sometimes associated with secondary crater chains or catenae. Here we use gravity inversions, hydrocode modeling, and observations to investigate the radial gravity anomalies in more detail. Density inversion models show that the gravity can be matched by solutions ranging from broad low amplitude anomalies to shallow high amplitude anomalies. Hydrocode models show that the impacting material remains as a thin layer within the secondary craters and this can explain the linear gravity anomalies. However, this does not explain the majority of linear gravity features that do not have secondary crater chains associated with them. Therefore, we conclude that the majority of radial gravity anomalies represent the structure of the ejecta blanket. This density variability within the ejecta of basins likely contributes substantially to the density variability of the shallow upper crust as a whole.
    Rights
    Copyright of the original work is retained by the author.
    Collections
    2018 - Mines Theses & Dissertations

    entitlement

     
    DSpace software (copyright © 2002 - 2023)  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.