Images of diagenetic textures in Porites corals from Papua New Guinea and Indonesia

Journal Article


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Abstract


  • Diagenesis is now recognized as a potentially major source of error in paleoclimatic reconstructions

    from fossil and modern coral geochemical records. Key to avoiding spurious results caused by diagenesis

    is thorough screening of coral material prior to geochemical analysis. In this data brief we present color

    images from thin sections of fossil and modern Porites corals and demonstrate the effectiveness of thin

    sections in detecting low levels of diagenesis. The images presented here cover a range of coral

    preservation levels from pristine aragonite to 100% calcite. We particularly focus on samples containing

    around 1% diagenetic material, a level known to create artifacts in key climate parameters such as sea

    surface temperature, and close to the detection limits of other screening methods such as X-ray diffraction

    (XRD). A qualitative scheme is also presented to rate the degree of diagenesis in a coral, where XRD

    results are not available or where secondary aragonite is present. Overall, this collection of images is

    designed as a starting point, in combination with other techniques, to assist in identifying and screening

    corals for diagenesis.

Publication Date


  • 2008

Citation


  • McGregor, H. V. & Abram, N. J. (2008). Images of diagenetic textures in Porites corals from Papua New Guinea and Indonesia. G3: Geochemistry, Geophysics, Geosystems: an electronic journal of the earth sciences, 9 (10), 1-17.

Scopus Eid


  • 2-s2.0-70350084857

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=6699&context=scipapers

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/3357

Number Of Pages


  • 16

Start Page


  • 1

End Page


  • 17

Volume


  • 9

Issue


  • 10

Place Of Publication


  • http://www.agu.org/journals/gc/

Abstract


  • Diagenesis is now recognized as a potentially major source of error in paleoclimatic reconstructions

    from fossil and modern coral geochemical records. Key to avoiding spurious results caused by diagenesis

    is thorough screening of coral material prior to geochemical analysis. In this data brief we present color

    images from thin sections of fossil and modern Porites corals and demonstrate the effectiveness of thin

    sections in detecting low levels of diagenesis. The images presented here cover a range of coral

    preservation levels from pristine aragonite to 100% calcite. We particularly focus on samples containing

    around 1% diagenetic material, a level known to create artifacts in key climate parameters such as sea

    surface temperature, and close to the detection limits of other screening methods such as X-ray diffraction

    (XRD). A qualitative scheme is also presented to rate the degree of diagenesis in a coral, where XRD

    results are not available or where secondary aragonite is present. Overall, this collection of images is

    designed as a starting point, in combination with other techniques, to assist in identifying and screening

    corals for diagenesis.

Publication Date


  • 2008

Citation


  • McGregor, H. V. & Abram, N. J. (2008). Images of diagenetic textures in Porites corals from Papua New Guinea and Indonesia. G3: Geochemistry, Geophysics, Geosystems: an electronic journal of the earth sciences, 9 (10), 1-17.

Scopus Eid


  • 2-s2.0-70350084857

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=6699&context=scipapers

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/3357

Number Of Pages


  • 16

Start Page


  • 1

End Page


  • 17

Volume


  • 9

Issue


  • 10

Place Of Publication


  • http://www.agu.org/journals/gc/