https://scholars.lib.ntu.edu.tw/handle/123456789/431836
標題: | Zircons U-Pb geochronology of the ore-bearing plutons of adjara-trialeti folded zone, lesser Caucasus and analysis of the magmatic processes | 作者: | Okrostsvaridze A. Chung S.-L. Chang Y.-H. Gagnidze N. Boichenko G. Gogoladze S. SUN-LIN CHUNG |
關鍵字: | Adjara-Trialeti folded zone;Plutons;U-Pb geochronology;Zircon | 公開日期: | 2018 | 卷: | 12 | 期: | 2 | 起(迄)頁: | 90-99 | 來源出版物: | Bulletin of the Georgian National Academy of Sciences | 摘要: | 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¡Ó0.61 Ma; Merisi (syenite) sm.#12Ge-04=42.78¡Ó0.65 Ma; Namonastrali (diorite) sm. #12Ge-05=42.42¡Ó0.5 Ma; Namonastrevi (diorite) sm.#12Ge-06=42.03¡Ó0.83 Ma; Vakijvari (syenite) sm.#12Ge-13=43.26¡Ó0.74 Ma; Zoti (syenite) sm. #12Ge-15 =43.86¡Ó0.43 Ma; Zoti (gabbro) sm.#12Ge-16=46.77¡Ó0.81 Ma; Okros-Ghele (syenite) sm. #12Ge=19-44.34¡Ó0.55 Ma; Rkviana (gabbro) sm. #12Ge-21=44.85¡Ó0.59 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 petrological-geochemical 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. ? 2018 Bull. Georg. Natl. Acad. Sci. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/431836 | ISSN: | 01321447 |
顯示於: | 地質科學系 |
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