Diagenesis

Diagenesis

  • Hadi Shafaii Moghadam added an answer:
    Why is Th an indication of diagenesis?
    After reading around the subject, I found a lot of literature suggesting that Th is an indication of diagenesis and not a factor of province. Why is this?
    Hadi Shafaii Moghadam · Damghan University; Institute of Geology and Geophysics, Chinese Academy of Sciences
    Dear Golnaz;
    Th is an immobile element during alteration and its abundance in detrital sediments is higher than pelagic sediments.
    see Plank and Langmuir, 1998; The chemical composition of subducting sediment and its consequences for the crust and mantle. Chemical Geology 145, 325-394.
  • Hilmi Mert Küçük added an answer:
    Can you give any basic information on Opal-A and Opal CT?
    Those subjects are related with diagenetic BSRs (bottom simulating reflector).
    Hilmi Mert Küçük · Dokuz Eylul University
    Dear Kenneth,

    You are right there are lots of informations about those subjects. However, I was trying to find basic explanations not detailed such as most of the internet sources. Anyway, I understand that it is related with diagenetic process at least. Thank you...
  • Andreas Paul added an answer:
    Can anyone give me any pointers on using cathodoluminescence to determine extent of alteration/diagenesis in carbonates?
    I’m keen to use CL as a quick method to identify appropriate samples for isotope analyses. From what I have read, CL is mostly used to analyse very small parts of a sample. However, I would like to see a large-scale effect on whole thin sections (75x50mm) so I can be confident about drilling sample that is as unaltered as possible. Advice?
  • Agnes Zay-Tello added an answer:
    Has anyone used 0.1% SDS sonication in diagenode?
    0.1% SDS sonication in diagenode:
    I know 1% SDS works great for diagenode bioruptor. Now I need to use a lower SDS concentration like 0.1% SDS. I haven't tried that yet, but I prefer to know if somebody here use that before.
    Another problem may be a longer time sonication process in 0.1%SDS may cause protein degradation?
    The rationale for 0.1% lysis buffer is to avoid using dilution buffer, which gives a large volume for IP. If anybody has tried any ultracentrifuge to reduce the volume, please tell me.
    Thank you all.
    Agnes Zay-Tello · University of Oxford
    I have used 0.1% sds in the past and it greatly reduced the sonication efficiency (I had to sonicate for 50 min), however I did not find any problem with doing the ip afterwards (some antibodies won't work if you sonicate in 1%, even though you dilute it out, not sure why this is the case, but I found it to be). So I would try 0.1% if I were you and retitrate the sonication time.
  • Jeff C. Clements added an answer:
    Is there any quantitative evidence regarding the degree of precision in using DIC over pH in predicting carbonate mineral saturation states?
    I'm assessing sedimentary carbonate saturation states with respect to aragonite and was wondering if it may be worthwhile to spend some money on DIC analysis rather than measuring pH for predicting aragonite saturation states? Given that DIC is quite expensive, I was wondering if there is any available literature outlining degrees of precision of the two predictors on which to base a decision?
    Jeff C. Clements · University of New Brunswick
    Much thanks Greg! I've been searching for a while now but could not find anything. Thanks for your input!
  • Bjørn Eske Sørensen added an answer:
    Looking for a software program in free domain that I can use to obtain digital spectra intensities for cathodoluminescence colours I have for my images?
    I have a set of images taken under CL and will like to obtain their digital spectra intensities to see how they vary with the chemical composition of the mineral phases.
    Bjørn Eske Sørensen · Norwegian University of Science and Technology
    are they hyperspectral images or RGB?

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