Zircons U-Pb Geochronology of the Ore-Bearing Plutons of Adjara-Trialeti Folded Zone, Lesser Caucasus and Analysis of the Magmatic Processes

Okrostsvaridze, Avtandil and Chung, Sun-Lin and Chang, Yu-Han and Gagnidze, Nona and Boichenko, Giorgi and Gogoladze, Salome (2018) Zircons U-Pb Geochronology of the Ore-Bearing Plutons of Adjara-Trialeti Folded Zone, Lesser Caucasus and Analysis of the Magmatic Processes. Bulletin of the Georgian National Academy of Sciences, 12 (2). pp. 90-99. ISSN 0132 - 1447

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Abstract

Zircons of the major ore-bearing plutons (Merisi, Namonastrali, Vakijvari, Zoti, Okros- Ghele and Rkviana) of the Adjara-Trialeti Paleogene folded zone of the Lesser Caucasus were dated by the U-Pb method using the Laser Ablation ICP-MS tool at the isotope laboratory of the Department of Earth Sciences at the National Taiwan University. The results are almost identical and are as follows: Merisi (diorite), sm. #12Ge-03=43.42±0.61 Ma; Merisi (syenite) sm.#12Ge- 04=42.78±0.65 Ma; Namonastrali (diorite) sm. #12Ge-05=42.42±0.5 Ma; Namonastrevi (diorite) sm.#12Ge-06=42.03±0.83 Ma; Vakijvari (syenite) sm.#12Ge-13=43.26±0.74 Ma; Zoti (syenite) sm. #12Ge-15 =43.86±0.43 Ma; Zoti (gabbro) sm.#12Ge-16=46.77±0.81 Ma; Okros-Ghele (syenite) sm. #12Ge=19-44.34±0.55 Ma; Rkviana (gabbro) sm. #12Ge-21=44.85±0.59 Ma. Based on the analysis of the results, it is obvious that the ore bearing plutons of the Adjara-Trialeti zone were intruded through the volcanic-sedimentary rocks within a short time interval, between 46-42 Ma. It should be noted that according to paleontological data, the peak of volcanic activity in the Ajara-Trialeti folded zone was similarly dated as the Middle Eocene. If we rely on these data and accept the results of the plutons zircons dating by U-Pb method above, we should assume that the volcanic activities in the region were shortly followed by plutonic injections. Proceeding from the above and the petrologicalgeochemical analysis of the rocks, we assert, that volcanic and plutonic formations of the Adjara- Trialeti zone are the products of the same magmatic source activity and their formation was not significantly separated in time.

Item Type:	Article
Subjects:	Q Science > QE Geology
Depositing User:	ავთანდილ ოქროსცვარიძე
Date Deposited:	25 Jul 2018 10:21
Last Modified:	25 Jul 2018 10:21
URI:	http://eprints.iliauni.edu.ge/id/eprint/8405

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