IOCAS-IR
The Early Cretaceous bimodal volcanic suite from the Yinshan Block, western North China Craton: Origin, process and geological significance
Guo, Pengyuan1,2; Niu, Yaoling1,2,3,4; Sun, Pu1,2; Wang, Xiaohong1,2; Gong, Hongmei1,2; Duan, Meng4; Zhang, Yu2; Kong, Juanjuan1,2; Tian, Liyan5; Wu, Shiguo5
2018-07-01
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume160Pages:348-364
Corresponding AuthorGuo, Pengyuan(guopy@qdio.ac.cn) ; Niu, Yaoling(yaoling.niu@durham.ac.uk)
AbstractWe present geochemical and age data for coeval basalt and rhyolite in the Yinshan Block, western North China Craton, to study the origin of the 'Daly Gap' in this bimodal volcanic suite. SHRIMP zircon U-Pb dating for felsic rocks and bulk rock Ar-40/Ar-38 dating for mafic rocks yield their ages of 107-133 Ma. The basalts show elevated abundances of incompatible elements with [La/Sm](N) = 2.65-3.54 and enriched Sr-Nd-Hf isotopic signatures (Sr-87/Sr-86(t) = 0.7054-0.7084, Nd-143/Nd-144(t) = 0.5119-0.5123, Hf-176/Hf-177(t) = 0.2824-0.2826), consistent with their derivation from low degree melting of previously metasomatized lithospheric mantle. The rhyolites display similar enrichment in alkalis and other incompatible elements, but have obvious Nb-Ta depletion. Combined with their more enriched Nd-Hf isotopic compositions (epsilon(Nd)(t) = -12 to -18, epsilon(Hf)(t) = - 2 to -14), these rhyolites are inferred to have been generated by mixing of the mantle-derived basaltic magma with felsic melts derived from lower continental crust anataxis induced by the basaltic magma. Furthermore, the extremely low Ba, Sr, Eu contents, high Rb/Sr ratios and unexpectedly high Sr-87/Sr-86 (0.7920-0.7159) in these felsic samples also suggests that their parental magma experienced protracted fractional crystallization of plagioclase (K-feldspar to a lesser extent) en route to the surface. This rock association and the unique geochemical characteristics of these volcanic rocks offer a new view on the petrogenesis of bimodal volcanism: the mafic rocks originated from partial melting of the ancient lithospheric mantle. Underplating of the basaltic magmas triggered melting of lower continental crust. The extensive fractional crystallization of the hybridized magma resulted in the highly fractionated rhyolites. This mechanism explains the "Daly Gap" exhibited in this rock association in a continental setting and also the observation that both the lithospheric mantle and crust in East China are thinner than that in West China.
KeywordBimodal volcanic suite North China Craton High Sr-87/Sr-86 ratios Intra-plate volcanism Lower crust re-working Lithosphere thinning
DOI10.1016/j.jseaes.2017.10.023
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China - China (NSFC)[41630968] ; National Natural Science Foundation of China - China (NSFC)[91014003] ; National Natural Science Foundation of China - China (NSFC)[41130314] ; Chinese Academy of Sciences[Y42217101L] ; Knowledge Innovation Program of the Sanya Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences[Y570031QY1]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000434751500023
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/159369
Collection中国科学院海洋研究所
Corresponding AuthorGuo, Pengyuan; Niu, Yaoling
Affiliation1.Chinese Acad Sci, Inst Oceanol, Nanhai Rd 7, Qingdao 266071, Shandong, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
3.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
4.China Univ Geosci, Sch Earth Sci & Mineral Resources, Beijing 100083, Peoples R China
5.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Guo, Pengyuan,Niu, Yaoling,Sun, Pu,et al. The Early Cretaceous bimodal volcanic suite from the Yinshan Block, western North China Craton: Origin, process and geological significance[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,160:348-364.
APA Guo, Pengyuan.,Niu, Yaoling.,Sun, Pu.,Wang, Xiaohong.,Gong, Hongmei.,...&Wu, Shiguo.(2018).The Early Cretaceous bimodal volcanic suite from the Yinshan Block, western North China Craton: Origin, process and geological significance.JOURNAL OF ASIAN EARTH SCIENCES,160,348-364.
MLA Guo, Pengyuan,et al."The Early Cretaceous bimodal volcanic suite from the Yinshan Block, western North China Craton: Origin, process and geological significance".JOURNAL OF ASIAN EARTH SCIENCES 160(2018):348-364.
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