气候变化领域集成服务门户(CCPortal): Petrogenesis of Late Triassic adakitic plutons in the East Kunlun Orogen, Northern Tibet: Geodynamic implications for the Paleo-Tethyan orogeny and crustal evolution

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DOI	10.1016/j.jseaes.2024.106165
	Petrogenesis of Late Triassic adakitic plutons in the East Kunlun Orogen, Northern Tibet: Geodynamic implications for the Paleo-Tethyan orogeny and crustal evolution
	Yan, Dongdong; Zhou, Hu; Li, Chengxiang; Zhang, Xiumeng; Ma, Changqian; Hou, Mingcai; Huang, Hu; Wang, Wei; Xiong, Fuhao
发表日期	2024
ISSN	1367-9120
EISSN	1878-5786
起始页码	268
卷号	268
英文摘要	Adakitic rocks found within continental arcs are pivotal in unraveling the geodynamic processes and tectonic evolution of East Kunlun Paleo-Tethyan orogen. We present an integrated study on the petrography, zircon U-Pb geochronology, whole-rock geochemistry, and Sr-Nd-Hf isotopes of newly identified Late Triassic adakitic plutons in the East Kunlun Orogenic Belt (EKOB), Northern Tibet, aiming to constrain their petrogenesis and geodynamic implications. These plutons comprise by mylonitized granite, monzogranite, granodiorite and dioritic porphyrite, exhibiting consistent zircon U-Pb ages of approximately 204-212 Ma. They have high SiO2, K2O and Sr (average of 479 ppm) contents, but low contents of Y (5.6-18 ppm) and Yb (0.5-1.0 ppm) with high Sr/Y ratios (17-63), resembling adakitic rocks. These adakitic rocks can be classified into high-Mg (Mg#= -51) and low-Mg groups (Mg#= -35), although they all display enriched large ion lithophile elements and light rare earth elements but depleted high field strength elements. The studied low-Mg adakitic rocks have low MgO (-0.68 wt %) and Cr (-35 ppm) with enriched zircon Hf isotopes (epsilon Hf(t) = - 1.16 t 2.44), suggesting their derivation by partial melting of thickened juvenile crust. Conversely, the high-Mg adakitic rocks exhibit high MgO (-1.94 wt %) and Cr (-61 ppm) with relatively high zircon epsilon Hf(t) values (-0.68 to 4.95), indicating their derivation from foundered crustal root with subsequent interaction with enriched mantle-derived magma. Tectonic reconstructions suggest that the formation of these Late Triassic adakitic rocks occurred in a post-collisional extension setting and the East Kunlun Paleo-Tethyan Ocean closed no later than Norian.
英文关键词	East Kunlun; Adakitic magmatism; Petrogenesis; Tectonic; Paleo-Tethyan
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001237676300001
来源期刊	JOURNAL OF ASIAN EARTH SCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/290187
作者单位	Chengdu University of Technology; Chengdu University of Technology; China University of Geosciences
推荐引用方式 GB/T 7714	Yan, Dongdong,Zhou, Hu,Li, Chengxiang,et al. Petrogenesis of Late Triassic adakitic plutons in the East Kunlun Orogen, Northern Tibet: Geodynamic implications for the Paleo-Tethyan orogeny and crustal evolution[J],2024,268.
APA	Yan, Dongdong.,Zhou, Hu.,Li, Chengxiang.,Zhang, Xiumeng.,Ma, Changqian.,...&Xiong, Fuhao.(2024).Petrogenesis of Late Triassic adakitic plutons in the East Kunlun Orogen, Northern Tibet: Geodynamic implications for the Paleo-Tethyan orogeny and crustal evolution.JOURNAL OF ASIAN EARTH SCIENCES,268.
MLA	Yan, Dongdong,et al."Petrogenesis of Late Triassic adakitic plutons in the East Kunlun Orogen, Northern Tibet: Geodynamic implications for the Paleo-Tethyan orogeny and crustal evolution".JOURNAL OF ASIAN EARTH SCIENCES 268(2024).