Research output: Contribution to journal › Article › peer-review
Detrital zircon record of the early Paleozoic meta-sedimentary rocks in Russian Altai : Implications on their provenance and the tectonic nature of the Altai-Mongolian terrane. / Chen, Ming; Sun, Min; Cai, Keda et al.
In: Lithos, Vol. 233, 15.09.2015, p. 209-222.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Detrital zircon record of the early Paleozoic meta-sedimentary rocks in Russian Altai
T2 - Implications on their provenance and the tectonic nature of the Altai-Mongolian terrane
AU - Chen, Ming
AU - Sun, Min
AU - Cai, Keda
AU - Buslov, Mikhail M.
AU - Zhao, Guochun
AU - Rubanova, Elena S.
AU - Voytishek, Elena E.
PY - 2015/9/15
Y1 - 2015/9/15
N2 - An integrated U-Pb and Hf-isotope study on detrital zircons from the early Paleozoic meta-sedimentary rocks along the Chalysh-Terekta-Ulagan-Sayan suture zone in Russian Altai was conducted in order to trace their provenance and tectonic setting. Most of the zircons possess oscillatory zoning and high Th/U ratios (>0.1), indicating their magmatic origin. The investigated samples yield similar zircon populations, i.e., dominant groups with late Neoproterozoic to early Paleozoic ages, followed by those from Mesoproterozoic to late Neoproterozoic and minor ones from Archean to middle Mesoproterozoic, indicating multiple tectono-thermal events in the source area. Comparison with surrounding tectonic units shows that the Tuva-Mongolian terrane and its adjacent island arcs possibly provided substantial materials to the sedimentary basin. These rocks show detrital zircon age patterns and Hf-isotope compositions similar to their counterparts in the Chinese Altai and Tseel terrane in western Mongolia, but different from those in the Gomy Altai terrane. Therefore, the investigated metasedimentary units possibly represented the northernmost segment of the Altai-Mongolian terrane. With combination of previous studies in the Chinese Altai and Tseel terrane, our data suggest that the Altai-Mongolian terrane possibly represents a coherent continental arc-accretionary prism system built upon the active margin of the western Mongolia during the Cambrian to Ordovician and thus does not support the micro-continent model with a passive margin.A compilation of U-Pb and Hf-isotope data of detrital zircons from the whole Altai-Mongolian terrane shows that the source area (i.e., the western Mongolia) underwent two most extensive magmatic activities at ca. 1.02-0.67 Ga and 0.67-0.43 Ga. These zircons possess both positive and negative epsilon(Hf)(t) values, suggesting significant crustal growth and reworking during the magmatic activities. Our study underlines a crucial role of Precambrian micro-continents (e.g., the Tuva-Mongolian terrane) and island arcs surrounding them in the formation of the Central Asian Orogenic Belt. (C) 2014 Elsevier B.V. All rights reserved.
AB - An integrated U-Pb and Hf-isotope study on detrital zircons from the early Paleozoic meta-sedimentary rocks along the Chalysh-Terekta-Ulagan-Sayan suture zone in Russian Altai was conducted in order to trace their provenance and tectonic setting. Most of the zircons possess oscillatory zoning and high Th/U ratios (>0.1), indicating their magmatic origin. The investigated samples yield similar zircon populations, i.e., dominant groups with late Neoproterozoic to early Paleozoic ages, followed by those from Mesoproterozoic to late Neoproterozoic and minor ones from Archean to middle Mesoproterozoic, indicating multiple tectono-thermal events in the source area. Comparison with surrounding tectonic units shows that the Tuva-Mongolian terrane and its adjacent island arcs possibly provided substantial materials to the sedimentary basin. These rocks show detrital zircon age patterns and Hf-isotope compositions similar to their counterparts in the Chinese Altai and Tseel terrane in western Mongolia, but different from those in the Gomy Altai terrane. Therefore, the investigated metasedimentary units possibly represented the northernmost segment of the Altai-Mongolian terrane. With combination of previous studies in the Chinese Altai and Tseel terrane, our data suggest that the Altai-Mongolian terrane possibly represents a coherent continental arc-accretionary prism system built upon the active margin of the western Mongolia during the Cambrian to Ordovician and thus does not support the micro-continent model with a passive margin.A compilation of U-Pb and Hf-isotope data of detrital zircons from the whole Altai-Mongolian terrane shows that the source area (i.e., the western Mongolia) underwent two most extensive magmatic activities at ca. 1.02-0.67 Ga and 0.67-0.43 Ga. These zircons possess both positive and negative epsilon(Hf)(t) values, suggesting significant crustal growth and reworking during the magmatic activities. Our study underlines a crucial role of Precambrian micro-continents (e.g., the Tuva-Mongolian terrane) and island arcs surrounding them in the formation of the Central Asian Orogenic Belt. (C) 2014 Elsevier B.V. All rights reserved.
KW - Detrital zircon
KW - Provenance
KW - Altai-Mongolian terrane
KW - Arc-accretionary prism
KW - ASIAN OROGENIC BELT
KW - PHANEROZOIC CRUSTAL GROWTH
KW - ND ISOTOPIC EVIDENCE
KW - U-PB GEOCHRONOLOGY
KW - ISLAND-ARC SYSTEM
KW - GORNY-ALTAI
KW - CHINESE ALTAI
KW - CONTINENTAL-CRUST
KW - WESTERN MONGOLIA
KW - LAKE ZONE
U2 - 10.1016/j.lithos.2014.11.023
DO - 10.1016/j.lithos.2014.11.023
M3 - Article
VL - 233
SP - 209
EP - 222
JO - Lithos
JF - Lithos
SN - 0024-4937
ER -
ID: 25380729