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Early Cretaceous gabbro-granite complex from central Inner Mongolia: Insights into initial rifting and crust-mantle interaction in the northern China-Mongolia basin-range tract
Yuan, Lingling1,2; Zhang, Xiaohui2,3; Yang, Zhili2,4
2019
Source PublicationLITHOS
ISSN0024-4937
Volume324Pages:859-876
AbstractCoeval high-K talc-alkaline to shoshonitic bimodal igneous suites hold a key to monitoring important geodynamic processes and crust-mantle interactions within post-collisional to within-plate extensional settings. Here we report a unique early Cretaceous gabbro-granite complex from the poorly exposed Erenhot basin region of central Inner Mongolia, eastern Central Asian Orogenic Belt (CAOB). The mafic suite includes small syenogabbro to monzodiorite stocks, while the felsic suite mainly comprises syenogranites with minor mafic to intermediate microgranular enclaves. The former exhibits a transitional character from alkali-calcic to alkalic, notable enrichment in large ion lithophile elements (LILEs) and weak to moderate depletion in high field strength elements (HFSEs), and possesses low initial Sr-87/Sr-86 ratios (0.70486-0.70537), positive epsilon(Nd) (t) (+2.1 - +2.6) and zircon epsilon(Hf)(t) (+2.3 - +9.0) values. These features suggest its derivation from low-degree melting of amphibole-bearing lherzolites in the lithospheric mantle that had been metasomatized by subducting slabderived fluids. The host granites are magnesian, alkali-calcic and peraluminous. They show typical trace elemental features of arc-related felsic melts, with initial Sr-87/Sr-86 ratios of 0.70499 to 0.70593, epsilon(Nd) (t) of -0.1 to +1.4, zircon epsilon(Hf)(t) of +4.8 to +83 and delta O-18 values from +4.53 to +6.60 parts per thousand. These elemental and isotopic traits are consistent with partial melts of a mixed protolith composed of newly-underplated basaltic materials and extant older lower crust. The monzonitic enclaves are alkalic, highly enriched in LILEs and depleted in HFSEs, with variable whole-rock Sr-Nd (l(sr)(t) = 0.70216-0.704678, epsilon(Nd)(t) = +02 - +1.8) and zircon Hf (epsilon(Hf) (t) = +0.9 - +7.1) isotopic values. These transitional compositions are compatible with hybridization processes between mantle-derived mafic magma and crust-derived felsic magma. Given its temporal coincidence with initial rifting in the regional basin formation and the closure of Mongol-Okhotsk ocean, Early Cretaceous Erenhot gabbrogranite complex could not only serve as spatial markers for relating magmatic underplating with basin formation, but also catch a unique snapshot into crust-mantle interactions within a post-orogenic extensional regime probably underpinned by lithospheric dripping and gravitational collapse after the Mongol-Okhotsk suturing. (C) 2018 Elsevier B.V. All rights reserved.
KeywordEarly cretaceous Bimodal suite Geochemistry North China Mongol-Okhotsk orogeny
DOI10.1016/j.lithos.2018.12.010
Funding OrganizationNational 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 ; NNSFC ; NNSFC ; Scientific Research Starting Foundation of Central South University ; Scientific Research Starting Foundation of Central South University ; 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 ; NNSFC ; NNSFC ; Scientific Research Starting Foundation of Central South University ; Scientific Research Starting Foundation of Central South University ; 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 ; NNSFC ; NNSFC ; Scientific Research Starting Foundation of Central South University ; Scientific Research Starting Foundation of Central South University ; 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 ; NNSFC ; NNSFC ; Scientific Research Starting Foundation of Central South University ; Scientific Research Starting Foundation of Central South University
WOS KeywordASIAN OROGENIC BELT ; K CALC-ALKALINE ; U-PB AGES ; VOLCANIC-ROCKS ; TECTONIC SIGNIFICANCE ; WORKING REFERENCE ; SOLONKER SUTURE ; NE ASIA ; NB-TA ; EVOLUTION
Language英语
Funding ProjectNational Natural Science Foundation of China[41390443] ; National Key R & D Program of China[2017YFC0601306] ; NNSFC[41573031] ; NNSFC[41873035] ; Scientific Research Starting Foundation of Central South University[502045004]
Funding OrganizationNational 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 ; NNSFC ; NNSFC ; Scientific Research Starting Foundation of Central South University ; Scientific Research Starting Foundation of Central South University ; 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 ; NNSFC ; NNSFC ; Scientific Research Starting Foundation of Central South University ; Scientific Research Starting Foundation of Central South University ; 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 ; NNSFC ; NNSFC ; Scientific Research Starting Foundation of Central South University ; Scientific Research Starting Foundation of Central South University ; 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 ; NNSFC ; NNSFC ; Scientific Research Starting Foundation of Central South University ; Scientific Research Starting Foundation of Central South University
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000457819800055
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90504
Collection岩石圈演化国家重点实验室
Corresponding AuthorZhang, Xiaohui
Affiliation1.Cent S Univ, Sch Geosci & Infophys, Key Lab Metallogen Predict Nonferrous Met & Geol, Minist Educ, Changsha 410083, Hunan, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Yuan, Lingling,Zhang, Xiaohui,Yang, Zhili. Early Cretaceous gabbro-granite complex from central Inner Mongolia: Insights into initial rifting and crust-mantle interaction in the northern China-Mongolia basin-range tract[J]. LITHOS,2019,324:859-876.
APA Yuan, Lingling,Zhang, Xiaohui,&Yang, Zhili.(2019).Early Cretaceous gabbro-granite complex from central Inner Mongolia: Insights into initial rifting and crust-mantle interaction in the northern China-Mongolia basin-range tract.LITHOS,324,859-876.
MLA Yuan, Lingling,et al."Early Cretaceous gabbro-granite complex from central Inner Mongolia: Insights into initial rifting and crust-mantle interaction in the northern China-Mongolia basin-range tract".LITHOS 324(2019):859-876.
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