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Tectonic timeline in the Mongol-Okhotsk oceanic regime: Insights from early Jurassic and early cretaceous mafic-intermediate dyke swarms in central Inner Mongolia, North China
Yang, Zhili1,2,3; Zhang, Xiaohui1,2; Yuan, Lingling4
2022-04-01
Source PublicationLITHOS
ISSN0024-4937
Volume414Pages:16
AbstractChronicling sequential mafic dyke swarms along convergent plate margins presents a key to outlining the tectonic timeline of complete Wilson orogenic cycles for any regional paleotectonic and global supercontinental reconstructions. This study documents two episodes of Mesozoic mafic dyke swarms from central Inner Mongolia in the combined northern China-southern Mongolia (NCSM) plate: The Gadabuqi (GDBQ) suite with an age of ca. 181 Ma from East Ujimqin and the Houtoumiao (HTM) suite with an age of ca. 131 Ma from West Ujimqin. The GDBQ suite consists of hornblende-rich appinitic rocks and ranges in SiO2 from 49.6 to 52.6%. They are calc-alkaline to high calc-alkaline and show enrichment in large ion lithophile element (LILE) and light rare earth element (LREE) but depletion in high field strength elements (HFSE), with whole-rock initial Sr-87/Sr-86 of 0.704608 to 0.706048, positive epsilon(Nd)(t) of +1.2 to +2.4 as well as zircon epsilon(Hf)(t) of +2.5 to +5.6 and delta O-18 of 5.4 to 6.5 parts per thousand. These features attributed the GDBQ suite to a juvenile fluid-metasomatized lithospheric mantle source. By contrast, the HTM suite mainly comprises gabbronorites with SiO2 from 55.1 to 56.4% and shows a transitional character from high calc-alkaline to shoshonitic. They are variably enriched in LREE and LILE but depleted in HFSE, with whole-rock initial Sr-87/Sr-86 of 0.705656 to 0.706543, epsilon(Nd)(t) of -1.1 to +3.4 and zircon epsilon(Hf)(t) of +2.9 to +9.1 and delta O-18 of 6.1 to 7.8 parts per thousand. These elemental and isotopic traits argued for a parental magma derivation from partial melting of a fertile asthenospheric mantle and syn-magmatic crustal assimilation and fractional crystallization. Besides representing the first recognition of two distinct basaltic underplating events in central Inner Mongolia, these two contrasting mafic dyke swarms are disposed to monitor a tectonic shift from Early Jurassic linear slab breakoff to Early Cretaceous pervasive lithospheric delamination in the Great Xing'an Range. In conjunction with polyphase magmatic records and multifarious manifestations of structural, metamorphic and sedimentological dimensions, the refined Mesozoic tectono-thermal sequence in the NCSM tract tends to encapsulate insightful testimonies for chronicling the tectonic timeline from pre-Jurassic ongoing subduction and slab roll back to prolonged post-collisional aftermath of the Jurassic to early Cretaceous times in the Mongolia-Okhotsk oceanic plate domain.
KeywordEarly Jurassic Early cretaceous Mafic dyke swarms Geochemistry Petrogenesis Mongol-Okhotsk tectonic regime
DOI10.1016/j.lithos.2022.106636
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China
WOS KeywordGREAT XINGAN RANGE ; ASIAN OROGENIC BELT ; BIMODAL VOLCANIC-ROCKS ; NE CHINA ; GRANITE COMPLEX ; SLAB BREAKOFF ; FELSIC MAGMAS ; ND ISOTOPE ; GEOCHEMISTRY ; EVOLUTION
Language英语
Funding ProjectNational Natural Science Foundation of China[41873035] ; National Natural Science Foundation of China[41573031] ; National Key R&D Program of China[2017YFC0601306]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000762435300002
PublisherELSEVIER
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/104976
Collection岩石圈演化国家重点实验室
Corresponding AuthorZhang, Xiaohui
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Cent South Univ, Sch Geosci & Info Phys, Key Lab Metallogen Predict Nonferrous Met & Geol, Minist Educ, Changsha 410083, Peoples R China
First Author AffilicationState Key Laboratory of Lithospheric Evolution
Corresponding Author AffilicationState Key Laboratory of Lithospheric Evolution
Recommended Citation
GB/T 7714
Yang, Zhili,Zhang, Xiaohui,Yuan, Lingling. Tectonic timeline in the Mongol-Okhotsk oceanic regime: Insights from early Jurassic and early cretaceous mafic-intermediate dyke swarms in central Inner Mongolia, North China[J]. LITHOS,2022,414:16.
APA Yang, Zhili,Zhang, Xiaohui,&Yuan, Lingling.(2022).Tectonic timeline in the Mongol-Okhotsk oceanic regime: Insights from early Jurassic and early cretaceous mafic-intermediate dyke swarms in central Inner Mongolia, North China.LITHOS,414,16.
MLA Yang, Zhili,et al."Tectonic timeline in the Mongol-Okhotsk oceanic regime: Insights from early Jurassic and early cretaceous mafic-intermediate dyke swarms in central Inner Mongolia, North China".LITHOS 414(2022):16.
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