I need a confirmation of the age of alluvium sediments in which we found a macro flora fossils. The fossils have wide stratigraphic range, but 41 percent of them are from the Early Pliocene. The rest of the fossils are also presented in the Early Pliocene. That is why I need a second dating method, the strata is rich of Limonite. If we could date it we will have the age of tha strata confirmed by another source.
Given the movement of materials (alluvial setting) cosmogenic nuclide dating might be the best option.
Thank you dear Aeron but the strata is 15 m bellow the surface. It was exposed to the cosmogenic nuclides for a short time during deposition, after that it was buried with new layers of sediments. Also there is fossilized wood particles maybe some methods connected with the use of long living isotopes are more suitable.
Dear Miroslav Ivanov,
I'am sorry, but the palynology examinations are not belong to my field. There are no pollens and spores in the limonit sediments. Ester Nagy and I have pollen examinations from pliocene age, (from gray sandy-clay), but unfortunately these are only manuscripts, I have not been evaluated them yet.
Thus unfortunately I can't help you.
Best regards Sütőné Szentai Mária.
Dear Dr. Ivanov,
the most suitable method is to try and look for cryptomelane in the "limonite" and make use of K/Ar or Ar/Ar dating; we were successful and it worked perfectly well, particularly in combination with "U yellow ore minerals" which are amenable to U/Pb dating.
For further information see papers below:
DILL, H.G., HANSEN, B., KECK, E.and WEBER, B. (2010) Cryptomelane a tool to determine the age and the physical-chemical regime of a Plio-Pleistocene weathering zone in a granitic terrain (Hagendorf, SE Germany) .- Geomorphology, 121: 370-377
DILL, H.G. and WEMMER, K. (2012) Origin and K/Ar age of cryptomelane-bearing Sn placers on silcretes, SE Germany.- Sedimentary Geology, 275/276: 70-78.
I wish you much success.
H.G.Dill
Thank you Dear Maria. Actually in this sediments there are layers of gray sandy-clay.
We prepared some samples, but hav not been examined yet.
Dear Harald, thank you very much for this valluable information. I am also surching a facility were this examination can be done. So far i have found one comercial laboratory in Boston, USA.
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