气候变化领域集成服务门户(CCPortal): Late Cretaceous high Sr/Y rocks and local crustal thickening in the eastern Gangdese batholith, southern Tibet

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DOI	10.1016/j.lithos.2024.107492
	Late Cretaceous high Sr/Y rocks and local crustal thickening in the eastern Gangdese batholith, southern Tibet
	Li, Guangxu; Zeng, Lingsen; Gao, Li-E; Yan, Lilong
发表日期	2024
ISSN	0024-4937
EISSN	1872-6143
卷号	468
英文摘要	The voluminous Late Cretaceous calc-alkaline magmatic rocks in the Gangdese batholith provide an important record on the mechanisms of the thickening and growth of the continental crust in a continental arc environment. Here, we report data from zircon U-Pb geochronology and geochemical (whole-rock element and Sr-Nd isotopes and zircon Hf isotope) analyses for the granodiorite and granite from Langxian to Lilong in the eastern Gangdese batholith. These data show that 1) the intermediate-felsic rocks formed at 82-70 Ma and are Na-rich peraluminous rocks. 2) The granodiorite commonly developed magmatic epidote with allanite-rich cores. 3) They are characterized by high Sr/Y and (La/Yb)N ratios, exhibiting an adakitic affinity. 4) Most of the samples have positive epsilon Hf(t) (+5.2 - +12.4) and bulk epsilon Nd(t) (+1.9 - +2.8) values, indicating that they were derived from partial melting of juvenile crust. 5) The crustal thickness in the eastern part of the Gangdese batholith locally thickened to -67 km. The data presented in this paper demonstrates that the Late cretaceous granodiorite and granite were generated by partial melting of the juvenile thickened lower crust (-67 km) with deep seated emplacement, and then they experienced rapid exhumation. The magmatic flare-up (90-75 Ma) and ocean ridge subduction in the eastern Gangdese batholith are responsible for the magma inflation and local crustal thickening.
关键词	Gangdese batholith Crustal thickness Magma inflation Southern Tibet
英文关键词	LHASA TERRANE; GEOCHEMICAL CONSTRAINTS; INTRUSIVE ROCKS; VOLCANIC-ROCKS; ARC MAGMAS; SW TIBET; MANTLE; PETROGENESIS; SUBDUCTION; ZIRCON
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:001163586200001
来源期刊	LITHOS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282964
作者单位	China Geological Survey; Chinese Academy of Geological Sciences; Institute of Geology, Chinese Academy of Geological Sciences; China Geological Survey; Chinese Academy of Geological Sciences; Institute of Geology, Chinese Academy of Geological Sciences
推荐引用方式 GB/T 7714	Li, Guangxu,Zeng, Lingsen,Gao, Li-E,et al. Late Cretaceous high Sr/Y rocks and local crustal thickening in the eastern Gangdese batholith, southern Tibet[J],2024,468.
APA	Li, Guangxu,Zeng, Lingsen,Gao, Li-E,&Yan, Lilong.(2024).Late Cretaceous high Sr/Y rocks and local crustal thickening in the eastern Gangdese batholith, southern Tibet.LITHOS,468.
MLA	Li, Guangxu,et al."Late Cretaceous high Sr/Y rocks and local crustal thickening in the eastern Gangdese batholith, southern Tibet".LITHOS 468(2024).