Crustal nature and origin of the Russian Altai: Implications for the continental evolution and growth of the Central Asian Orogenic Belt (CAOB)

被引:21
|
作者
Cai, Keda [1 ]
Sun, Min [2 ]
Buslov, M. M. [3 ,4 ]
Jahn, Bor-ming [5 ]
Xiao, Wenjiao [1 ]
Long, Xiaoping [6 ]
Chen, Huayong [7 ]
Wan, Bo [8 ]
Chen, Ming [2 ]
Rubanova, E. S. [3 ,4 ]
Kulikova, A. V. [3 ,4 ]
Voytishek, E. E. [3 ,4 ]
机构
[1] Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Beijing South Rd, Urumqi 830011, Peoples R China
[2] Univ Hong Kong, Dept Earth Sci, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China
[3] Russian Acad Sci, Siberian Branch, Inst Geol & Mineral, 3 Prosp Akad, Novosibirsk 630090, Russia
[4] Novosibirsk State Univ, Pirogova St 2, Novosibirsk 630090, Russia
[5] Natl Taiwan Univ, Dept Geosci, Taipei 106, Taiwan
[6] NW Univ Xian, State Key Lab Continental Dynam, Dept Geol, Northern Taibai Str 229, Xian 710069, Peoples R China
[7] Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Isotope Geochronol & Geochem, Guangzhou 510640, Guangdong, Peoples R China
[8] Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
基金
美国国家科学基金会;
关键词
Central Asian Orogenic Belt; Subduction-accretion complex; Altai-Mongolian terrane; Accretionary orogenesis; Continent crustal growth; ZIRCON U-PB; NORTH CHINA CRATON; EARLY PALEOZOIC SEDIMENTS; NW CHINA; TECTONIC EVOLUTION; SIBERIAN CRATON; GEOCHRONOLOGICAL EVIDENCE; ACCRETIONARY OROGENESIS; KUZNETSK-ALATAU; GORNY-ALTAI;
D O I
10.1016/j.tecto.2016.02.026
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The Central Asian Orogenic Belt is a gigantic tectonic collage of numerous accreted terranes. However, its geodynamic evolution has been hotly debated primarily due to incomplete knowledge on the nature of these enigmatic terranes. This work presents new detrital zircon U-Pb and Hf isotopic data to constrain the crustal nature and origin of the Russian Altai, a critical segment of Altai-Mongolian terrane. The youngest zircon Pb-206/U-238 ages of 470 Ma constrain that the Terekta Formation, previously envisaged as Precambrian basement, was actually deposited after the Middle Ordovician. As for the three more sedimentary sequences above the Terekta Formation, they have youngest zircon Pb-206/U-238 ages of 425 Ma, 440 Ma and 380 Ma, respectively, indicating their depositions likely in the Late Silurian to Devonian. From all analyses, it is noted that many zircon U-Pb ages cluster at ca. 520 Ma and ca. 800 Ma, and these zircons display oscillatory zoning and have subhedral to euhedral morphology, which, collectively, suggests that adjacent Neoproterozoic to Paleozoic igneous rocks were possibly dominant in the sedimentary provenance. Additionally, a few rounded Archean to Mesoproterozoic zircon grains are characterized by complex texture, which are interpreted as recycling materials probably derived from the Tuva-Mongolian microcontinent. Precambrian rocks have not been identified in the Russian Altai, Chinese Altai and Mongolian Altai so far, therefore, Precambrian basement may not exist in the Altai-Mongolian terrane, but this terrane probably represents a large subduction-accretion complex built on the margin of the Tuva-Mongolian microcontinent in the Early Paleozoic. Multiple episodes of ridge-trench interaction may have caused inputs of mantle-derived magmas to trigger partial melting of the newly accreted crustal materials, which contributed to the accretionary complex. During accretionary orogenesis of the CAOB, formation of such subduction-accretion complex is likely ubiquitous, indicating continental crust growth by both lateral accumulation and vertical basaltic injection. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:182 / 194
页数:13
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