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Late Carboniferous gabbro-granite suite from West Ujimqin of central Inner Mongolia: Petrogenesis and geodynamic implication
Yang ZhiLi1,2,3; Zhang XiaoHui1,2; Gao YanLong4; Yuan LingLing5; Xue FuHong6
2022-03-01
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume38Issue:3Pages:830-854
AbstractCoeval bimodal igneous suites of gabbro and granite commonly typify frequent extensional episodes in the Wilson cycle of plate tectonics. With a unique view to tracing extensional geodynamic processes and related crust-mantle interactions through the petrogeochemical characteristics of such suites, this paper reports the newly identified Late Carboniferous Houtoumiao gabbro-granite suite from West Ujimqin of central Inner Mongolia, eastern Central Asian Orogenic Belt ( CAOB). SIMS zircon U-Pb dating unravels the emplacement age of gabbro at ca. 307Ma and that of granite at ca. 305 Ma. The gabbros mainly consist of plagioclase, pyroxene and amphibole. They range in SiO2 from 50.4% to 53.4% , exhibiting magnesian, metaluminous and calc-alkalic affinities, with enrichment in large ion lithophile elements ( LILEs) and depletion in high field strength elements ( HFSEs). They possess OIB-type whole-rock Sr-Nd (I-Sr (t) = 0. 704249 similar to 0. 704330 , epsilon(Nd) (t) = +1.73 similar to +3. 81) and zircon Hf (epsilon(Hf)(t) = +4.58 similar to +15. 16) isotope compositions , and zircon delta O-1(8) values from 5. 75 parts per thousand to 6. 61 parts per thousand. These features suggest that the gabbros might be derived from the partial melting of a depleted metasomatised mantle wedge from subduction-derived fluids. The coeval granites mainly comprise plagioclase, K-feldspar, quartz and biotite. They span in SiO2 from 76. 3% to 77. 6%, with high alkalis, thorium and uranium but low iron, magnesium, strontium and barium. They are weakly peraluminous with negative Eu anomalies. These features are typical of highly fractionated I-type felsic magmas. With respect to isotopic compositions, the granites are characterized with medium radiogenic whole- rock I-sr( t) ( 0. 704923 similar to 0. 704981 ), epsilon(Nd)(t) (- 0. 15 similar to + 0. 57) and zircon epsilon(Hf) (t) ( - 2.63 similar to + 7. 40 ) , and high zircon delta O-1(8) (6. 44 parts per thousand -8. 06 parts per thousand). Given their highly fractionated character and highly evolved sources, the Houtoumiao granites tend to have been derived from the partial melts of the composite mafic to intermediate lower crust composed of multi-stage accretionary materials in the Mesoproterozoic and Paleozoic times, with subsequent fractional crystallization yielding the high-silica granites. Combined with the spatial and temporal distribution patterns of regional Carboniferous-Early Permian ophiolitic melange and island arc magmatic complexes, the Late Carboniferous Houtoumiao gabbro-granite suite seems to record diffuse regional extension event due to ridge subduction in central Inner Mongolia. On one hand, this event is not only distinct from slab rollback episode of the Early-Middle Carboniferous arc-basin system in West Ujimqin, but also in contrast with large-scale post-collisional extension during Early Permian time. On the other hand, when taken together, these episodic extensional events tend to witness the complete course of the Late Paleozoic Wilson cycle in the eastern CAOB.
KeywordLate Carboniferous Bimodal suite Petrogenesis Ridge subduction Central Inner Mongolia
DOI10.18654/1000-0569/2022.03.14
WOS KeywordA-TYPE GRANITES ; ZIRCON MEGACRYSTS ; PERALUMINOUS GRANITES ; ISOTOPE EVIDENCE ; CRUSTAL GROWTH ; CENTRAL-ASIA ; CONSTRAINTS ; MANTLE ; CHINA ; MAGMAS
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000780616600014
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105093
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.Zhongjin Gold Corp Ltd, Beijing 100011, Peoples R China
5.Cent South Univ, MOE Key Lab Metallogen Predict Nonferrous Met & G, Sch Geosci & Info Phys, Changsha 410083, Peoples R China
6.Inner Mongolia Nonferrous Geol Min Ltd Liabil Co, Hohhot 010010, 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,Gao YanLong,et al. Late Carboniferous gabbro-granite suite from West Ujimqin of central Inner Mongolia: Petrogenesis and geodynamic implication[J]. ACTA PETROLOGICA SINICA,2022,38(3):830-854.
APA Yang ZhiLi,Zhang XiaoHui,Gao YanLong,Yuan LingLing,&Xue FuHong.(2022).Late Carboniferous gabbro-granite suite from West Ujimqin of central Inner Mongolia: Petrogenesis and geodynamic implication.ACTA PETROLOGICA SINICA,38(3),830-854.
MLA Yang ZhiLi,et al."Late Carboniferous gabbro-granite suite from West Ujimqin of central Inner Mongolia: Petrogenesis and geodynamic implication".ACTA PETROLOGICA SINICA 38.3(2022):830-854.
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