气候变化领域集成服务门户(CCPortal): Geodynamics and nature of the basement of the northern Lhasa Terrane: Insights from Early Cretaceous highly fractionated I-type granites in the Beila and Dongga areas, central Tibetan Plateau

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DOI	10.1016/j.jseaes.2024.106078
	Geodynamics and nature of the basement of the northern Lhasa Terrane: Insights from Early Cretaceous highly fractionated I-type granites in the Beila and Dongga areas, central Tibetan Plateau
	Zhang, Song; Huang, Feng; Xu, Jifeng; Zeng, Yunchuan; Lv, Mingda; Su, Chaoxing; Tian, Ye; Tian, Yamei; Fan, Haiyan; Wang, Shuo
发表日期	2024
ISSN	1367-9120
EISSN	1878-5786
起始页码	264
卷号	264
英文摘要	Collisional orogenic belts serve as excellent places for investigating geodynamic process and growth mechanism of the continental crust. As one of the largest collisional orogenic belts worldwide, the Tibetan Plateau is formed by the amalgamation of multiple tectonic terranes. However, the nature and composition of the crustal basement beneath the northern Lhasa Terrane, located in central Tibetan Plateau, is still a matter of debate. Here, we investigated a series of Early Cretaceous granites in the Beila and Dongga areas, northern Lhasa Terrane. Zircon U-Pb dating reveals that the Beila and Dongga granites were emplaced at ca. 118 Ma and 110 Ma, respectively. These granites are characterized by high SiO2 and K2O, low TiO2 and P2O5 contents and low Mg#. They exhibit enrichment in light rare earth elements, significant negative Eu anomalies, and depletion in Ba and Sr. These geochemical features suggest that they belong to highly fractionated I-type granites. Both the Beila and Dongga granites display similar and enriched whole-rock Sr-Nd and zircon Hf isotope compositions, implying a likely common ancient crustal origin. Given the temporal sequences and redox conditions during their formation, it is highly probable that the Beila and Dongga granites formed during the syn-collision stage between the Lhasa and Qiangtang Terranes and the breakoff of the Bangong-Nujiang oceanic slab, respectively. Integrated with coeval magmatism in the central Tibetan Plateau, our new data reveal the presence of a regionally preserved ancient basement beneath the northern Lhasa Terrane, analogous to the equivalent basement beneath the central Lhasa Terrane.
英文关键词	Early Cretaceous; I-type granite; Crustal basement; Tectonic evolution; Northern Lhasa Terrane
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001194093400001
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/303632
作者单位	China University of Geosciences; China University of Geosciences; Michigan State University
推荐引用方式 GB/T 7714	Zhang, Song,Huang, Feng,Xu, Jifeng,et al. Geodynamics and nature of the basement of the northern Lhasa Terrane: Insights from Early Cretaceous highly fractionated I-type granites in the Beila and Dongga areas, central Tibetan Plateau[J],2024,264.
APA	Zhang, Song.,Huang, Feng.,Xu, Jifeng.,Zeng, Yunchuan.,Lv, Mingda.,...&Wang, Shuo.(2024).Geodynamics and nature of the basement of the northern Lhasa Terrane: Insights from Early Cretaceous highly fractionated I-type granites in the Beila and Dongga areas, central Tibetan Plateau.JOURNAL OF ASIAN EARTH SCIENCES,264.
MLA	Zhang, Song,et al."Geodynamics and nature of the basement of the northern Lhasa Terrane: Insights from Early Cretaceous highly fractionated I-type granites in the Beila and Dongga areas, central Tibetan Plateau".JOURNAL OF ASIAN EARTH SCIENCES 264(2024).