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Diverse middle Neoarchean granitoids and the delamination of thickened crust in the Western Shandong Terrane, North China Craton
Hu, Yalu1; Liu, Shuwen1; Gao, Lei1; Sun, Guozheng1; Guo, Rongrong2; Fu, Jinghao1; Wang, Maojiang1; Hu, Fangyang3
2019-12-01
Source PublicationLITHOS
ISSN0024-4937
Volume348Pages:23
AbstractMiddle Neoarchean granitoids contain crucial clues for understanding crust-mantle interactions and further investigating the mechanism of the compositional transformation of the crust in the Neoarchean. In the Western Shandong Terrane (WST), diverse Neoarchean magmatism is recognized, including similar to 2.62 Ga tonalitic gneisses, similar to 2.59 Ga granodioritic gneisses and similar to 2.61-2.58 Ga monzogranitic gneisses, which generally intruded into similar to 2.70 Ga tonalite-trondhjemite-granodiorite (TTG) gneisses. The similar to 2.70 Ga TTG gneisses show high SiO2 contents (70.17-72.89 wt%), but low MgO contents (0.58-0.69 wt%) and high (La/Yb)(N) ratios (30 -48) and originated from partial melting of low-K mafic rocks at lower crustal levels. The similar to 2.62 Ga tonalitic gneisses exhibit low K2O/Na2O ratios (0.10-0.39), but high (La/Yb)(N) (7.60-12.7) and Sr/Y (18.8-48) ratios and Mg# (47-57). With high epsilon(Hf)(t(2)) values ranging from +2.7 to +7.4, these rocks were derived from dehydration melting of subducted oceanic slabs. The similar to 2.61-2.58 Ga monzogranitic gneisses show high SiO2 (70.35 -75.12 wt%) and K2O (4.35-5.81 wt%) contents but low MgO (0.20-0.77 wt%) contents with positive epsilon(Hf)(t(2)) values (+2.0 - +6.6), suggesting they were derived from partial melting of juvenile greywackes. The similar to 2.59 Ga granodioritic gneisses exhibit high SiO2 (66.34-73.04 wt%), K2O (2.23-4.32 wt%) and MgO (1.39-3.51 wt%) contents with dispersed epsilon(Hf)(t(2)) values (-0.2 - +53), indicating a mixing process between crust- and mantle-sourced magmas. The similar to 2.59 Ga granodioritic gneisses show consistent major and trace element compositions (i.e., high Mg#, lack of Eu anomalies and uniform chondrite-normalized REE patterns), and accordingly, their magmatic precursors were derived from partial melting of delaminated lower crustal materials. The lithological assemblages in the WST became increasingly diverse between similar to 2.71-2.58 Ga, changing from TTG gneisses to arc-related rock series, and then to delamination-related granodioritic gneisses, crust-derived monzogranitic and trondhjemitic gneisses and mantle-derived tholeiitic basalts and diorites. By integrating these data with a reduction in the continental crustal thickness from similar to 2.70 Ga to 2.55 Ga, a subduction-delamination model is proposed in which a long-term lateral accretion beginning at similar to 2.7 Ga and persisting through similar to 2.68-2.62 Ga led to the delamination of the lower crust at similar to 2.61-2.58 Ga, which may have further triggered the transition of the continental crust composition from basaltic to andesitic. (C) 2019 Elsevier B.V. All rights reserved.
KeywordWestern Shandong Terrane Diverse Neoarchean granitoids Petrogenesis and zircon ages Neoarchean delamination North China Craton
DOI10.1016/j.lithos.2019.105178
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 Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS KeywordTRONDHJEMITE-GRANODIORITE TTG ; PB-HF ISOTOPES ; CONTINENTAL-CRUST ; SANUKITOID SERIES ; INTRUSIVE ROCKS ; KAAPVAAL CRATON ; GREENSTONE-BELT ; YISHUI TERRANE ; VOLCANIC-ROCKS ; EASTERN BLOCK
Language英语
Funding ProjectNational Natural Science Foundation of China[41772188] ; National Natural Science Foundation of China[41530207]
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 Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000500375700007
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95801
Collection岩石圈演化国家重点实验室
Corresponding AuthorLiu, Shuwen
Affiliation1.Peking Univ, Sch Earth & Space Sci, Minist Educ, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China
2.Northeastern Univ, Sch Resources & Civil Engn, Dept Geol, Key Lab,Minist Educ Safe Min Deep Met Mines, Shenyang 110819, Liaoning, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Hu, Yalu,Liu, Shuwen,Gao, Lei,et al. Diverse middle Neoarchean granitoids and the delamination of thickened crust in the Western Shandong Terrane, North China Craton[J]. LITHOS,2019,348:23.
APA Hu, Yalu.,Liu, Shuwen.,Gao, Lei.,Sun, Guozheng.,Guo, Rongrong.,...&Hu, Fangyang.(2019).Diverse middle Neoarchean granitoids and the delamination of thickened crust in the Western Shandong Terrane, North China Craton.LITHOS,348,23.
MLA Hu, Yalu,et al."Diverse middle Neoarchean granitoids and the delamination of thickened crust in the Western Shandong Terrane, North China Craton".LITHOS 348(2019):23.
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