The frequency curve is of a clay bed from a valley lake deposit in a mountanous terrain.
extreme care is taken when sampling so mixing of samples may not be the case.
Hi Debarati, be careful because you are in lacustrine sediments deposited by "suspension processes acting in the lake". Then, as Fadhil said, probably the bimodal distribution in your frequency curve can be influenced by different sources. So the sediments (from different sources: fluvial, glacial, aerosols?) could be responsible for this bimodal parameter.
You must be sure about the sources of the lacustrine sediments in your area.
Cheers!
could be a problem with the scaling, use micron scale instead phi and moment measures. I used a excell sheet, Gradistat by Blot et al.
Make use of log probability paper i.e. Size in Phi verses Cu %, it will definitely give you interpretable pattern.
From the cumulative curve you can measure the percentiles that help you to calculate the grain size parameters. If you want to get an idea on how the different particle size and stocks that help us to know the sources of sediment supply, we must trace the frequency curves (Weight Percent (%) = f (d (phi or mm)). With the presence of several slopes and inflection points on your cumulative curve, it is a multimodal distribution, and we can say that this sediment comes from different areas (sources).
Best regards,
Amor DEGAICHIA
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