RT info:eu-repo/semantics/article
T1 Magnetic dating of the Holocene monogenetic Tkarsheti volcano in the Kazbeki region (Great Caucasus)
A1 Vashakidze, Goga
A1 Goguitchaichvili, Avto
A1 García Redondo, Natalia
A1 Calvo Rathert, Manuel
A1 Carrancho Alonso, Ángel
A1 Cejudo, Ruben
A1 Morales, Juan Ignacio .
A1 Lebedev, Vladimir A.
A1 Gabarashvili, Ketino
K1 Great Caucasus
K1 Monogenetic volcano
K1 Kazbeki
K1 Magnetic dating
K1 Magnetismo
K1 Magnetism
K1 Geología
K1 Geology
AB The radiocarbon technique is widely used to date Late Pleistocene and Holocene lava flows. The significant differencewith palaeomagnetic methods is that the 14C dating is performed on the organic matter carbonized by the rockformation or the paleosols found within or below the lava flow. On the contrary, the archaeomagnetic dating allowsto date the moment when the lava is cooling down below the Curie temperatures. In the present study, we use thepaleomagnetic dating to constrain the age of the Tkarsheti monogenetic volcano located within the Kazbeki VolcanicProvince (Great Caucasus). A series of rock-magnetic experiments including the measurement of hysteresis curves,isothermal remanence, back-field and continuous thermomagnetic curves were applied. These experiments indicatedthat Pseudo-Single-Domain Ti-poor titanomagnetite is responsible for remanence. A characteristic remanent magnetizationwas obtained for all twenty analyzed samples yielding a stable single magnetization component observedupon both thermal and alternating field treatments. Comparison of the mean directions obtained (Inc = 48.6º,Dec = 6.4º, A95= 4.0° and K = 67) with the SCHA.DIF.14k model yielded two main time intervals (4740–4650 or 4427–4188 BC) as the best age estimate of the Lesser Tkarsheti lava flow. These results suggest an earlier age (betweenapproximately 200 and 700 years) for this monogenetic lava flow than expected from the estimated age provided bya former 14C dating obtained in 1973 on woody remains. This first attempt to use the archaeomagnetic technique inthe Caucasus indicates that the SCHA.DIF.14k geomagnetic model may be successfully used for dating purposes inthe region.
PB Springer
SN 1343-8832
YR 2019
FD 2019-12
LK http://hdl.handle.net/10259/6105
UL http://hdl.handle.net/10259/6105
LA eng
NO Projects BU0066U16 and BU235P18 (Junta deCastilla y Leon, Spain) and the European Regional Development Fund (ERDF).AG is grateful for financial support of CONACyT 252149 and UNAM-PAPIITproject 101717. MC-R and AC acknowledge the financial support given bythe Junta de Castilla y León (project BU235P18) and the European RegionalDevelopment Fund (ERD).
DS Repositorio Institucional de la Universidad de Burgos
RD 23-nov-2024