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Revisiting the Late Jurassic adakitic rocks in the Yanshan fold and thrust belts, North China Craton: Partial melts from thickened continental crust?

文献类型：期刊论文

作者Wu, Ya-Dong3; Yang, Jin-Hui1,3; Sun, Jin-Feng1,4; Wang, Hao3; Zhou, Bao-Quan1,3; Xu, Lei3; Wu, Bin2
刊名LITHOS
出版日期2022-11-15
卷号430页码:13
关键词North China Craton Adakitic rocks Tiaojishan Formation Crustal thickening
ISSN号0024-4937
DOI10.1016/j.lithos.2022.106885
英文摘要An integrated study of zircon U-Pb ages and Hf-O isotopes, whole rock and apatite geochemistry, and whole rock Sr-Nd-Hf isotopes were conducted for the Jurassic adakitic volcanic rocks from the Tiaojishan Formation in the Yanshan Fold and Thrust Belt (YFTB) of the North China Craton, to investigate their genesis, with attention to the role of crust thickness in achieving the adakitic traits. Zircon U-Pb dating gives eruption ages of 162-158 Ma for these rocks. These rocks have variable SiO2 (55.7-68.1 wt%) and MgO (0.35-4.0 wt%), and adakitic trace element signatures including high Sr/Y (27.9-100) and (La/Yb) N ratios (9.6-27.6). Chemical variations in whole rock and apatite suggest a feldspar-dominated fractional crystallization, superimposed by variable mineral accumulation on whole rock compositions. Together with isotopic compositions that include evolved whole rock (Sr-87/Sr-86)(i) = 0.70447-0.70591, epsilon(Nd)(t) = -17.5 to -12.1, and epsilon(Nf)(t) = -22.2 to -11.2, and zircon epsilon(Hf) (t) = -26.8 to -11.2 and delta O-18 = 5.7-7.0 parts per thousand, we attribute these rocks are sourced from mafic lower continental crust. By comparing the trace element signatures between the examined samples and modern continental arc magmatic rocks formed at variable crustal thickness, it is suggested that these rocks are most likely originated from a thickened crust. A further estimate based on whole rock Sr/Y and La/Yb gives a crust thickness of 56 +/- 7 km. The crust thickening and associated uplift of the YFTB could be attributed to the westward subduction of the Paleo-Pacific plate. This led to a high altitude (similar to 3.8 +/- 0.9 km) and cool climate habitat (a mean annual paleo-temperature of 7 +/- 7 degrees C) for the Yanliao Biota lived therein during this period, which may have played an important role in the earliest appearance of the feathered characteristic of dinosaurs.
WOS关键词YANLIAO BIOTA ; ARC MAGMA ; APATITE ; EVOLUTION ; CONSTRAINTS ; THICKNESS ; DIFFERENTIATION ; GEOCHRONOLOGY ; GEOCHEMISTRY ; PETROGENESIS
资助项目National Natural Science Foundation of China ; [42288201] ; [42003029] ; [42073034]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000869700600001
出版者ELSEVIER
资助机构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 ; 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 ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/107790]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Wu, Ya-Dong
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
2.East China Univ Technol, State Key Lab Nucl Resources & Environm, Nanchang 330013, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Univ Chinese Acad Sci, Key Lab Computat Geodynam, 19A Yuquanlu, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Wu, Ya-Dong,Yang, Jin-Hui,Sun, Jin-Feng,et al. Revisiting the Late Jurassic adakitic rocks in the Yanshan fold and thrust belts, North China Craton: Partial melts from thickened continental crust?[J]. LITHOS,2022,430:13.
APA Wu, Ya-Dong.,Yang, Jin-Hui.,Sun, Jin-Feng.,Wang, Hao.,Zhou, Bao-Quan.,...&Wu, Bin.(2022).Revisiting the Late Jurassic adakitic rocks in the Yanshan fold and thrust belts, North China Craton: Partial melts from thickened continental crust?.LITHOS,430,13.
MLA Wu, Ya-Dong,et al."Revisiting the Late Jurassic adakitic rocks in the Yanshan fold and thrust belts, North China Craton: Partial melts from thickened continental crust?".LITHOS 430(2022):13.

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来源：地质与地球物理研究所

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