Petrogenesis of Early Cretaceous granitoids in Liyang volcanic basin, eastern China: Geodynamic implications for Paleo-Pacific slab rollback

doi:10.1016/j.tecto.2022.229521

	Petrogenesis of Early Cretaceous granitoids in Liyang volcanic basin, eastern China: Geodynamic implications for Paleo-Pacific slab rollback
	Qian, Lin 1; Xie, Jiancheng 1; Huang, Shan 1; Ge, Likai 1; Zhang, Xin 1; Li, Quanzhong 1; Liu, Jianmin 1; Yan, Jun 1; Sun, Weidong2,3,4
	2022-09-05
发表期刊	TECTONOPHYSICS
ISSN	0040-1951
卷号	838 页码:18
通讯作者	Xie, Jiancheng([email protected])
摘要	Late Mesozoic magmatism in eastern China was extensive and closely related to the subduction of the PaleoPacific plate, but genetic relationship between magmatism and subduction remains unclear. Cretaceous magmatic rocks distributed along the eastern coast of China can provide an opportunity to evaluate the influence of subduction on the evolution of the magmatism. Here, a combined study of whole-rock major-trace elements and Sr-Nd-Pb-Hf isotopes as well as zircon U-Pb ages was carried out for the Cretaceous granitoids in Liyang volcanic basin, eastern China. Zircon U-Pb dating results indicate that the Liyang granitoids were emplaced in the Early Cretaceous (ca. 130???125 Ma). These samples (SiO2 = 70.8???75.3 wt%) are mainly composed of high-K calcalkaline granite and granite porphyry. Their geochemical characteristics are similar to I-type granites, with enrichment in LREEs, Rb, Th and U, and negative Eu (??Eu = 0.04???0.51), Ba, Sr, P and Ti anomalies. All samples show negative whole-rock ??Nd(t) (-9.8 to -5.7) and zircon ??Hf(t) (-15.7 to -3.60) values (corresponding crustal Hf model ages of 1.40???2.17 Ga), and high radiogenic Pb isotopic compositions. The integrated interpretation of geochemical data reveal that rollback of the Paleo-Pacific subducted slab resulted in lithospheric extension and thinning, and the upwelling of hot asthenosphere in eastern China, which induced more intensive underplating of the mantle-derived mafic magma. The ascent of heat and mafic magma, intruded in Meso-Neoproterozoic crust, and triggered partial melting of the Meso-Neoproterozoic crust. The Liyang I-type granitoids were the result of the Meso-Neoproterozoic crustal components mixing with a small number of mantle-derived magmas in the extensional tectonic setting, which was response to slab rollback of the Paleo-Pacific plate.
关键词	Early Cretaceous Liyang granitoid Petrogenesis Paleo-Pacific slab rollback Eastern China
DOI	10.1016/j.tecto.2022.229521
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[42030801]; National Natural Science Foundation of China[41373045]; National Key Research and Development Program of China[2016YFC0600404]
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000840814500001
出版者	ELSEVIER
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/179935
专题	深海极端环境与生命过程研究中心
通讯作者	Xie, Jiancheng
作者单位	1.Hefei Univ Technol, Sch Resources & Environm Engn, Hefei 230009, Peoples R China 2.Chinese Acad Sci, Ctr Deep Sea Res, Ctr Ocean Mega Sci, Inst Oceanol, Qingdao 266071, Peoples R China 3.Qingdao Pilot Natl Lab Marine Sci & Technol, Deep Sea Multidisciplinary Res Ctr, Qingdao 266237, Peoples R China 4.Univ Chinese Acad Sci, Sch Marine Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Qian, Lin,Xie, Jiancheng,Huang, Shan,et al. Petrogenesis of Early Cretaceous granitoids in Liyang volcanic basin, eastern China: Geodynamic implications for Paleo-Pacific slab rollback[J]. TECTONOPHYSICS,2022,838:18.
APA	Qian, Lin.,Xie, Jiancheng.,Huang, Shan.,Ge, Likai.,Zhang, Xin.,...&Sun, Weidong.(2022).Petrogenesis of Early Cretaceous granitoids in Liyang volcanic basin, eastern China: Geodynamic implications for Paleo-Pacific slab rollback.TECTONOPHYSICS,838,18.
MLA	Qian, Lin,et al."Petrogenesis of Early Cretaceous granitoids in Liyang volcanic basin, eastern China: Geodynamic implications for Paleo-Pacific slab rollback".TECTONOPHYSICS 838(2022):18.