Journal of Asian Earth Sciences, volume 174, pages 37-58
Detrital zircon U–Pb ages of Paleo- to Neoproterozoic black shales of the Baikal-Patom Highlands in Siberia with implications to timing of metamorphism and gold mineralization
Publication type: Journal Article
Publication date: 2019-05-01
Journal:
Journal of Asian Earth Sciences
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor: 3
ISSN: 13679120, 18785786, 07439547
Earth-Surface Processes
Geology
Abstract
A U–Pb isotope system of detrital zircons was used to determine the provenance and maximum deposition age of the Paleoproterozoic Mikhailovka and the Ediacaran Khomolkho, Aunakit and Dogaldyn Formations in the Baikal-Patom Highlands, one of the most ancient components of the Central Asian Orogenic Belt (CAOB). The Baikal-Patom area hosts the world-class Lena orogenic gold province with total endowment of up to 6000 tons Au. The gold deposits are confined to the compressional syn- or post-metamorphic structures at various stratigraphic levels in Paleoproterozoic to Neoproterozoic black shale sequences deposited in the Bodaibo passive margin of the Siberian platform. Nine samples were collected from mineralized rocks to address possible detrital zircon recrystallization and transformation during superimposed metamorphic and hydrothermal events. Zircon was analyzed using laser ablation – single collector – magnetic sectorfield – inductively coupled plasma – mass spectrometry (LA-SF-ICP-MS). The Mikhailovka metasediments yielded three concordant isotopic age clusters: predominant Archean (2.45–3.25 Ga), Paleoproterozoic (1.96–2.10 Ga), and Cambrian-Ediacaran-Cryogenian (524–702 Ma), whereas most of the zircon grains yielded discordant isotopic ages. Multiple lines of evidence (i.e., grain morphologies, specific set of mineral inclusions, distinctly high U and Th in zircon, and several persistent Pb-loss arrays of discordant ages with lower intercepts of concordia line at closely the same point) suggest the youngest cluster combines formerly metamict zircon of different ancient ages recrystallized under the peak conditions of the regional metamorphic event synchronous with or slightly preceding mineralization. Therefore, the youngest detrital grain isotopic age of 1961 ± 20 Ma determines the maximum depositional age of the Mikhailovka sediments that predates the emplacement of the Paleoproterozoic collisional Chuya-Nechera granitoids. Zircon grains from these granitoids represent a major population in the overlying Ediacaran sequences that indicate the prevalence of supply from proximal local sources, such as the uplifts of the ancient Siberian basement within the Bodaibo paleobasin. The age span of the Neoproterozoic detrital zircon population (604–966 Ma) in the younger formations is in agreement with the events in the CAOB and Siberian platform.
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Palenova E. E. et al. Detrital zircon U–Pb ages of Paleo- to Neoproterozoic black shales of the Baikal-Patom Highlands in Siberia with implications to timing of metamorphism and gold mineralization // Journal of Asian Earth Sciences. 2019. Vol. 174. pp. 37-58.
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Palenova E. E., Yudovskaya M. A., Frei D., Rodionov N. V. Detrital zircon U–Pb ages of Paleo- to Neoproterozoic black shales of the Baikal-Patom Highlands in Siberia with implications to timing of metamorphism and gold mineralization // Journal of Asian Earth Sciences. 2019. Vol. 174. pp. 37-58.
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TY - JOUR
DO - 10.1016/j.jseaes.2018.10.022
UR - https://doi.org/10.1016/j.jseaes.2018.10.022
TI - Detrital zircon U–Pb ages of Paleo- to Neoproterozoic black shales of the Baikal-Patom Highlands in Siberia with implications to timing of metamorphism and gold mineralization
T2 - Journal of Asian Earth Sciences
AU - Palenova, Ekaterina E
AU - Yudovskaya, Marina A.
AU - Frei, Dirk
AU - Rodionov, Nikolai V
PY - 2019
DA - 2019/05/01 00:00:00
PB - Elsevier
SP - 37-58
VL - 174
SN - 1367-9120
SN - 1878-5786
SN - 0743-9547
ER -
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@article{2019_Palenova,
author = {Ekaterina E Palenova and Marina A. Yudovskaya and Dirk Frei and Nikolai V Rodionov},
title = {Detrital zircon U–Pb ages of Paleo- to Neoproterozoic black shales of the Baikal-Patom Highlands in Siberia with implications to timing of metamorphism and gold mineralization},
journal = {Journal of Asian Earth Sciences},
year = {2019},
volume = {174},
publisher = {Elsevier},
month = {may},
url = {https://doi.org/10.1016/j.jseaes.2018.10.022},
pages = {37--58},
doi = {10.1016/j.jseaes.2018.10.022}
}