Cone-in-cone structure: New data
https://doi.org/10.24930/1681-9004-2020-20-1-76-92
Abstract
Research subject. The article presents the results of investigating calcite lenses with a cone-in-cone structure from Middle Devonian clay terrigenous deposits in the Middle Timan.
Methods. The investigation of petrographic thin-sections was carried out using a polarizing microscope Nikon eclipse LV100 ND equipped with a Nikon DS Fi2 camera. Polished sections etched with HCl were examined using a scanning electronic microscope JSM-6400 Jeol with a power dispersive spectrometer ISIS Link and a wave spectrometer Microspec. The decomposition of carbonates and the measurement of isotope carbon composition in the mode of continuous helium stream were carried out using a ThermoFisher Scientific analytical complex.
Results. It is established that the investigated calcite bodies consists of mosaic block crystals having a drusy structure. Calcite is characterized by abnormally low values S13Ccarb - up to -23.5 %o. Clay films and soapstone inclusions were studied in detail. The formation mechanism of the saw-tooth profile of the upper bound of these inclusions was determined, which consists in the local substitution of alumosilicates with calcite under the maintenance of their relic layered texture.
Conclusions. A new version of the crystallization model of carbonate body genesis with a cone-in-cone structure is proposed.
Supporting agencies: The work was supported by the RFBR, grant 20-05-00445A
About the Author
I. Kh. Shumilov
N.P. Yushkin Institute of Geology, Komi Science Center, Ural Branch of RAS
Russian Federation
Russian Federation
Igor’ Kh. Shumilov
54 Pervomayskaya st, Syktyvkar 167982
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Review
For citations:
Shumilov I.Kh. Cone-in-cone structure: New data. LITHOSPHERE (Russia). 2020;20(1):76-92. (In Russ.) https://doi.org/10.24930/1681-9004-2020-20-1-76-92
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