Late Cambrian tonalite-trondhjemite association in the eastern segment of North Qilian suture zone: petrogenesis and geodynamic implications

doi:10.1080/00206814.2020.1818142

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	Late Cambrian tonalite-trondhjemite association in the eastern segment of North Qilian suture zone: petrogenesis and geodynamic implications
	Chen, Yuxiao 3,4; Cui, Ying 3; Song, Shuguang 3; Fu, Shanming 4; Zhang, Lipeng 1,2; Sun, Weidong 1,2; Xiao, Tangfu 4
刊名	INTERNATIONAL GEOLOGY REVIEW
	2020-09-19
页码	19
关键词	Tonalite-trondhjemite fractional crystallization Cambrian magmatism enclave interlayer north Qilian suture zone
ISSN号	0020-6814
DOI	10.1080/00206814.2020.1818142
通讯作者	Chen, Yuxiao(chyxiao@gzhu.edu.cn)
英文摘要	The late Cambrian tonalite-trondhjemite association in the eastern segment of North Qilian suture zone (E. NQSZ) is important for understanding of the sub-arc magmatic process and tectonic evolution. Here we report data for feldspar-quartz porphyry and fine-grained trondhjemite with abundant tonalite enclave/interlayer from the Leigongshan (LGS) pluton, and medium-grained tonalite from the Beilinggou (BLG) pluton. Zircon U-Pb ages suggest emplacement of the plutons at ca. 506-481 Ma, associated with early subduction of the North Qilian Ocean. The LGS tonalite enclave/interlayers and trondhjemite hosts share many characteristics in common, including the same mineralogy and texture, similar mineral chemistry, whole-rock trace element ratio and Sr-Nd isotopic compositions. The tonalite enclave/interlayers probably represent quenched blobs/layers of an evolved, tonalitic magma branch resulting from periodic injection of magma into the magma chamber. All the LGS-BLG tonalite-trondhjemites display low abundances of incompatible trace elements (e.g., K, Rb, Th, Zr and REE) and depleted Sr-Nd-Hf isotopes (Sr-87/Sr-86 = 0.707490-0.707840; epsilon(Nd)(t) = +4.0-4.3; zircon epsilon(Hf)(t) = +4.0-13.1), indicating little/no contribution of the continental crust. Geochronological and geochemical consistency between the coeval arc sodium-rich volcanic rocks and studied tonalite-trondhjemites further suggests crystal fractionation of a common basaltic parental magma. The parental magma was generated in continental-arc rifting environments due to slab rollback in the early stage of subduction.
资助项目	National Natural Science Foundation of China[41903022,91955202]
WOS研究方向	Geology
语种	英语
出版者	TAYLOR & FRANCIS INC
WOS记录号	WOS:000570271700001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/168801]
专题	海洋研究所_深海极端环境与生命过程研究中心
通讯作者	Chen, Yuxiao
作者单位	1.Chinese Acad Sci, Inst Oceanol, Ctr Ocean Mega Sci, Qingdao, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao, Peoples R China 3.Peking Univ, Sch Earth & Space Sci, MOE Key Lab Orogen Belts & Crustal Evolut, Beijing, Peoples R China 4.Guangzhou Univ, Sch Environm Sci & Engn, Minist Educ, Key Lab Water Qual & Conservat Pearl River Delta, Guangzhou, Peoples R China
推荐引用方式 GB/T 7714	Chen, Yuxiao,Cui, Ying,Song, Shuguang,et al. Late Cambrian tonalite-trondhjemite association in the eastern segment of North Qilian suture zone: petrogenesis and geodynamic implications[J]. INTERNATIONAL GEOLOGY REVIEW,2020:19.
APA	Chen, Yuxiao.,Cui, Ying.,Song, Shuguang.,Fu, Shanming.,Zhang, Lipeng.,...&Xiao, Tangfu.(2020).Late Cambrian tonalite-trondhjemite association in the eastern segment of North Qilian suture zone: petrogenesis and geodynamic implications.INTERNATIONAL GEOLOGY REVIEW,19.
MLA	Chen, Yuxiao,et al."Late Cambrian tonalite-trondhjemite association in the eastern segment of North Qilian suture zone: petrogenesis and geodynamic implications".INTERNATIONAL GEOLOGY REVIEW (2020):19.