• 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.

    Scanning Electron Microscopic Studies of Fossil Pteropods from the Andaman Sea: Inferences on Carbonate Dissolution

    Thumbnail
    Date
    2020
    Author
    Sijinkumar, A.V
    Nath, B.N.
    Vinodkumar, K.B.
    Metadata
    Show full item record
    Abstract
    Among the different microfossils group, pteropods are least studied zooplanktons having delicate aragonitic shells which are very susceptible to dissolution. The present study has been carried out to understand the effect of dissolution, shell structure and the morphological variations of extant pteropods shells preserved in the late Quaternary sediments of the Andaman Sea with the help of scanning electron microscope (SEM). The study has helped to identify fifteen species of pteropods belong to Family of Limacinidae (Limacina inflata, L. bulimoides, L. trochiformis, Creseis chierchiae, C. virgula, Clio cuspidata and C. pyramidata) and Cavoliniidae (Creseis acicula, C. Conica, Diacria quadridentata, D. trispinosa, Clio convexa, Styliola subula, Cavolina gibbosa and Hyalocylis striata). Microscopic dissolution features are observed on all the species belong to both Limacinidae and Cavoliidae family. Specifically, species like H. striata and L. inflata are more prone to dissolution. The magnified SEM images of pteropods preserved in the last glacial maximum (LGM) and Heinrich event 1(H1) are not showing any features of dissolution which indicates better preservation. However, presence of pits, cavities, fractures and crevices on the shell surfaces was observed on the specimens of inter-stadial period B�lling/Aller�d (B/A). These dissolution features of B/A may be due to the increased strength of summer monsoon and resulted in high biological productivity which might have affected the pteropods shells owing to their vulnerability to dissolution. During high productivity, there is high concentration of dissolved inorganic carbon, resulting from high input and remineralisation of organic matter, lowering the pH of seawater which enhance dissolution of shells.
    URI
    https://doi.org/10.16943/ptinsa/2019/49714
    http://drs.nio.org/drs/handle/2264/8429
    Collections
    • Scholarly literature [9074]

    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