On the possibility of introducing X-ray computed microtomography into the practice of biostratigraphic research
https://doi.org/10.18599/grs.2021.4.2
Abstract
Currently, the techniques applied for extraction and study of conodonts from siliceous rocks are associated with a number of problems. This makes it difficult to solve many problems in the areas of development of the volcanic and volcanic-sedimentary rocks, where cherts, jaspers, and phtanites are the only sedimentary formations for dating these deposits.
On X-ray computed microtomography it is possible to avoid some problems to obtain not only excellent 3-D images of conodonts, but sections in any direction too, as well as in video formats. It is shown that similar results are successful under the hollows after the dissolution of the conodonts.
There is no problem in application of X-ray microcomputed tomography when conodonts have been already found on the surface or inside of the sample, or if the content of conodonts in the rock is obviously high. In such a case the scanning without preliminary search is ensured. In cases when conodonts are rare and not obvious, it is proposed the following technique of their discovery.
The rock sample is cut into plates. The conodonts are search for on the surface of the plates, moistened with a mixture of glycerin and water under a binocular microscope. If it is necessary (when the rock is opaque), the result is checked by a chemical reaction: 5–10 % hydrochloric acid plus 1–2 crystals of ammonium molybdate are put on the surface of the sample. The appearance of a yellow sediment means the presence of phosphorus, to indicate the probability the detected object to be a conodont. Next, the sample should be washed from acid, its size should be decreased. Then the microtomographic study should be performed.
Supporting agencies: The work was carried out on the topic of state assignment No. 0246-2019-0118 and at the expense of the Kazan Federal University Strategic Academic Leadership Program.
About the Authors
A. M. Fazliakhmetov
Institute of Geology – Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences
Russian Federation
Russian Federation
Alexander M. Fazliakhmetov – PhD (Geology and Mineralogy), Senior Researcher
16/2 Karl Marx st., Ufa, 450077
O. V. Artyushkova
Institute of Geology – Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences
Russian Federation
Russian Federation
Olga V. Artyushkova – DSc (Geology and Mineralogy), Chief Researcher
16/2 Karl Marx st., Ufa, 450077
E. O. Statsenko
Kazan Federal University
Russian Federation
Russian Federation
Evgeny O. Statsenko – Junior Researcher, Institute of Geology and Oil and Gas Technologies
4/5 Kremlevskaya st., Kazan, 420111
R. I. Kadyrov
Institute of Geology and Oil and Gas Technologies, Kazan Federal University
Russian Federation
Russian Federation
Rail I. Kadyrov – PhD (Geology and Mineralogy)
4/5 Kremlevskaya st. Kazan, 420111
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For citations:
Fazliakhmetov A.M., Artyushkova O.V., Statsenko E.O., Kadyrov R.I. On the possibility of introducing X-ray computed microtomography into the practice of biostratigraphic research. Georesursy = Georesources. 2021;23(4):12-20. (In Russ.) https://doi.org/10.18599/grs.2021.4.2
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