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  4. 中国科学院矿产资源研究重点实验室
Late Paleozoic-Early Mesozoic granitoids in the Khangay-Khentey basin, Central Mongolia: Implication for the tectonic evolution of the Mongol-Okhotsk Ocean margin

文献类型：期刊论文

作者Ganbat, Ariuntsetseg1,2; Tsujimori, Tatsuki2,11; Miao, Laicheng10; Safonova, Inna8,9; Pastor-Galan, Daniel2,7,11; Anaad, Chimedtseren1,5; Baatar, Munkhtsengel1,6; Aoki, Shogo3,4; Aoki, Kazumasa3; Savinskiy, Ilya9
刊名LITHOS
出版日期2021-12-01
卷号404页码:18
关键词CAOB Mongol-Okhotsk Ocean Geochronology Crustal evolution Hf-in-zircon Nd isotope
ISSN号0024-4937
DOI10.1016/j.lithos.2021.106455
英文摘要The Mongol-Okhotsk Belt is the youngest segment of the Central Asian Orogenic Belt, which is the venue of the massive juvenile crust emplacement, and its formation and evolutions are still pending problems. This paper presents the first up-to-date U-Pb zircon ages, Hf-in-zircon isotope, geochemical and whole-rock Nd isotope data from igneous rocks of the Khangay-Khentey basin, Central Mongolia. The U-Pb zircon ages indicate three groups of magmatism at -296 Ma, -280 Ma, and -230 Ma. The -296 Ma magmatic rocks are characterized by negative epsilon Hf(t) and epsilon Nd(t) values and old Hf and Nd model ages suggesting their derivation by the melting of the crustal source. The -280 Ma rocks are A2-type monzonites, granitoids, and rhyolites show positive epsilon Hf(t) and epsilon Nd(t) values and Neoproterozoic Hf and Nd model ages. The geochemical and isotope data suggest that -280 Ma magmatism derived by the melting of a crustal source, induced by mantle upwelling. The -230 Ma rock assemblage includes granitoids and volcanic rocks. The I-type calc-alkaline granitoids are enriched in K, Rb, U, and Th. The geochemical characteristics suggest that they have formed by the melting of a hornblende-bearing crustal source with the participation of fluids separated from the subducting slab. The positive epsilon Hf(t) and epsilon Nd(t) -230 Ma rocks suggest partial melting of a depleted lower crustal material with the contribution of ancient crustal material. The -296 Ma granitoids possess coherent/coupled Nd-Hf isotopic compositions supporting their origin from the ancient crust. Although the number of -296 Ma samples are small, we suggest that they were probably emplaced at an active continental setting, -280 Ma samples could have formed in a setting of local extension environment, -230 Ma granitoids were also formed at an active continental margin. These magmatic rocks formed during the subduction of the Mongol-Okhotsk oceanic plate beneath the Central Mongolia-Erguna Block.
WOS关键词A-TYPE GRANITES ; ASIAN OROGENIC BELT ; U-PB ; VOLCANIC-ROCKS ; LU-HF ; GEOCHEMICAL CHARACTERISTICS ; CHEMICAL CLASSIFICATION ; CONTINENTAL GROWTH ; CRUSTAL EVOLUTION ; GEODYNAMIC NATURE
资助项目FRIS of Tohoku Uni-versity ; MEXT/JSPS KAKENHI[JP18H01299] ; MEXT/JSPS KAKENHI[JP21H01174] ; MEXT/JSPS KAKENHI[JP19K04043] ; Russian Science Foundation[20-77-10051] ; Russian Science Foundation[21-77-20022] ; Japanese Gov-ernment MEXT Scholarship ; CNEAS ; National Natural Science Foundation of China[41772230]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000709378100004
出版者ELSEVIER
资助机构FRIS of Tohoku Uni-versity ; FRIS of Tohoku Uni-versity ; MEXT/JSPS KAKENHI ; MEXT/JSPS KAKENHI ; Russian Science Foundation ; Russian Science Foundation ; Japanese Gov-ernment MEXT Scholarship ; Japanese Gov-ernment MEXT Scholarship ; CNEAS ; CNEAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; FRIS of Tohoku Uni-versity ; FRIS of Tohoku Uni-versity ; MEXT/JSPS KAKENHI ; MEXT/JSPS KAKENHI ; Russian Science Foundation ; Russian Science Foundation ; Japanese Gov-ernment MEXT Scholarship ; Japanese Gov-ernment MEXT Scholarship ; CNEAS ; CNEAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; FRIS of Tohoku Uni-versity ; FRIS of Tohoku Uni-versity ; MEXT/JSPS KAKENHI ; MEXT/JSPS KAKENHI ; Russian Science Foundation ; Russian Science Foundation ; Japanese Gov-ernment MEXT Scholarship ; Japanese Gov-ernment MEXT Scholarship ; CNEAS ; CNEAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; FRIS of Tohoku Uni-versity ; FRIS of Tohoku Uni-versity ; MEXT/JSPS KAKENHI ; MEXT/JSPS KAKENHI ; Russian Science Foundation ; Russian Science Foundation ; Japanese Gov-ernment MEXT Scholarship ; Japanese Gov-ernment MEXT Scholarship ; CNEAS ; CNEAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/102997]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Ganbat, Ariuntsetseg
作者单位1.Mongolian Univ Sci & Technol, Geosci Ctr, Ulaanbaatar 120646, Mongolia
2.Tohoku Univ, Grad Sch Sci, Dept Earth Sci, Sendai, Miyagi 9808578, Japan
3.Okayama Univ Sci, Ctr Fundamental Educ, Okayama 7000005, Japan
4.Akita Univ, Grad Sch Int Resource Sci, Akita 0108502, Japan
5.Nat Hist Museum Mongolia, Ulaanbaatar 120646, Mongolia
6.Mongolian Univ Sci & Technol, Ulaanbaatar 120646, Mongolia
7.Tohoku Univ, Frontier Res Inst Interdisciplinary Sci, Sendai, Miyagi 9800845, Japan
8.SB RAS, Sobolev Inst Geol & Mineral, Koptyuga ave. 3, Novosibirsk 630090, Russia
9.Novosibirsk State Univ, Pirogova St. 1, Novosibirsk 630090, Russia
10.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Ganbat, Ariuntsetseg,Tsujimori, Tatsuki,Miao, Laicheng,et al. Late Paleozoic-Early Mesozoic granitoids in the Khangay-Khentey basin, Central Mongolia: Implication for the tectonic evolution of the Mongol-Okhotsk Ocean margin[J]. LITHOS,2021,404:18.
APA Ganbat, Ariuntsetseg.,Tsujimori, Tatsuki.,Miao, Laicheng.,Safonova, Inna.,Pastor-Galan, Daniel.,...&Savinskiy, Ilya.(2021).Late Paleozoic-Early Mesozoic granitoids in the Khangay-Khentey basin, Central Mongolia: Implication for the tectonic evolution of the Mongol-Okhotsk Ocean margin.LITHOS,404,18.
MLA Ganbat, Ariuntsetseg,et al."Late Paleozoic-Early Mesozoic granitoids in the Khangay-Khentey basin, Central Mongolia: Implication for the tectonic evolution of the Mongol-Okhotsk Ocean margin".LITHOS 404(2021):18.

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来源：地质与地球物理研究所

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