气候变化领域集成服务门户(CCPortal): Triassic oceanic - continental transition of the Ganzi - Litang Ocean basin: Evidence from high-Mg andesites and Nb-enriched basalts in the Litang area, Eastern Tibet

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DOI	10.1016/j.jseaes.2024.106136
	Triassic oceanic - continental transition of the Ganzi - Litang Ocean basin: Evidence from high-Mg andesites and Nb-enriched basalts in the Litang area, Eastern Tibet
	Yan, Songtao; Ding, Ailing; Dai, Xuejian; Liu, Tao; Li, Hu; Dai, Hongrui; Chen, Peng; Wu, Qingsong; Zhu, Lidong
发表日期	2024
ISSN	1367-9120
EISSN	1878-5786
起始页码	266
卷号	266
英文摘要	Petrological evidence of the oceanic-continental transition of intra-oceanic arcs enables the identification and reconstruction of the transformation of ocean basins into continents. In this study, we present new elemental and Sr-Nd isotopic compositions and zircon U-Pb ages for Triassic andesites and basalts in the Litang area, Eastern Tibet. Andesites in Cunge and basalts in Juewu contain zircon grains with U-Pb ages of 246 +/- 2 and 248 +/- 2 Ma, respectively, indicating a Middle Triassic origin. Andesites in Cunge have high SiO 2 contents (53.1-56.5 wt%), MgO contents (5.15-7.13 wt%), and Mg # values (54-61), similar to Sanukite-type high -Mg andesites. Basalts in Juewu have high TiO 2 (1.43-1.80 wt%) and Nb (12.5-20.2 ppm) contents, and high Nb/U and (Nb/La) N values, typical of Nb-enriched basalts. The andesites and basalts were both characterized by low ( 87 Sr/ 86 Sr) i values (0.7033-0.7044) and positive epsilon Nd( t ) values ( +4.2- +4.8). Therefore, interactions between melt from the subducting slab and mantle wedge peridotite formed andesites in Cunge, whereas the partial melting of mantle peridotite metasomatized by an adakitic melt (produced by the melted slab) formed basalts in Juewu. The findings of this study indicate that the formation of the andesites and basalts in the Litang area were related to intra-oceanic subduction magmatism, which was the product of the westward subduction of the Ganzi-Litang Ocean basin in the Middle Triassic.
英文关键词	High -Mg andesite; Nb-enriched basalt; Middle Triassic; Intra-oceanic subduction; Ganzi-Litang ophiolitic me lange belt
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001223255000003
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/290538
作者单位	China Geological Survey; Chengdu University of Information Technology; Chengdu University of Technology; Chengdu University of Technology
推荐引用方式 GB/T 7714	Yan, Songtao,Ding, Ailing,Dai, Xuejian,et al. Triassic oceanic - continental transition of the Ganzi - Litang Ocean basin: Evidence from high-Mg andesites and Nb-enriched basalts in the Litang area, Eastern Tibet[J],2024,266.
APA	Yan, Songtao.,Ding, Ailing.,Dai, Xuejian.,Liu, Tao.,Li, Hu.,...&Zhu, Lidong.(2024).Triassic oceanic - continental transition of the Ganzi - Litang Ocean basin: Evidence from high-Mg andesites and Nb-enriched basalts in the Litang area, Eastern Tibet.JOURNAL OF ASIAN EARTH SCIENCES,266.
MLA	Yan, Songtao,et al."Triassic oceanic - continental transition of the Ganzi - Litang Ocean basin: Evidence from high-Mg andesites and Nb-enriched basalts in the Litang area, Eastern Tibet".JOURNAL OF ASIAN EARTH SCIENCES 266(2024).