U‐pb La‐icp‐ms Dating of Zircons From Subvolcanics of the Bimodal Dyke Series of the Western Transbaikalia: Technique, and Evidence of the Late Paleozoic Extension of the Crust

Abstract

Abstract:Our study investigates a possibility of using isotope ratios of U-Th-Pb system in zircon analysis by the LA-ICP-MS technique and monitoring of precision, convergence and accuracy. New U-Pb isotope-geochronological data has been obtained for the salic and mafic members of the bimodal Late Paleozoic series of subparallel dykes in the central part of the Western Transbaikalia. It is shown that a series of subparallel dykes (290-280 Ma) gives evidence of extension of the continental crust at the final stage of the Late Paleozoic granitoid magmatism. Similar ages of zircons in the salic and mafic subvolcanic rocks confirm the geological indicators of the coexistence and interactions between the magmas of contrasting compositions.

Age, Conditions of Formation, and Fluid Composition of the Pervomaiskoe Molybdenum Deposit (Dzhidinskoe Ore Field, South-Western Transbaikalia, Russia)

“…The Mo content in FIs reaches~559 ppm (average 28 ppm) in high-grade quartz-molybdenite veinlets and is up to 212 ppm (average 25 ppm) in the low-grade veinlets. (6). High-grade veinlets were formed by near-neutral solutions with a high content of Mo, S, F, Cu, and Zn, while low-grade veinlets were deposited from alkaline fluids, revealing the pH of solutions as one of the factors of ore content.…”

“…Isotope analysis of laser-vaporized zircon substance was performed on a Thermo Scientific Element XR single collector sector-field ICP mass spectrometer. Detailed description of the analytical technique and parameters of the procedure was published in [5,6]. Data of mass-spectrometric analysis were processed using the GLITTER software [7] and ISOPLOT macros [8].…”

Age of the coal accumulation in the Irkutsk basin based on accessory zircon dating in the Azeisk deposit tonstein (LA-ICP-MS)

“…The measurement data were processed using the GLITTER (Griffin, 2008), IsoplotR (P Vermeesch, 2018) and ISOPLOT (Ludwig, 2012) software. The instrumental parameters and measurement technique in more detail are described in (Buyantuev et al, 2017;Khubanov et al, 2016).…”

U-Pb (LA-ICP-MS) age of detrital zircons and the sources of terrigenous sediments of the Ipsit suite, Karagass series (Sayan segment of the Sayan-Baikal-Patom belt)

“…U-Pb изотопный анализ циркона выполнен методом лазерной абляции на масс-спектрометре высокого разрешения Element XR (Thermo Fisher Scientific), соединенном с приставкой для лазерного прибора UP-213 с длиной волны излучения 213 нм (New Wave Research) в Аналитическом центре минералого-геохимических и изотопных исследований ГИН СО РАН (г. Улан-Удэ). Инструментальные параметры приборов и методика измерений описаны в работах [Khubanov et al, 2016;Buyantuev et al, 2017]. При анализе проводилось измерение изотопных отношений в цирконах без какого-либо их предварительного отбора по размеру или морфологии.…”