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	Late-Eocene Dala adakitic granite, southern Tibet and geological implications.
	Xie KeJia; Zeng LingSen; Liu Jing; Gao LiE
通讯作者	Xie, KJ (通讯作者)
发表日期	2010
ISSN	1000-0569
EISSN	2095-8927
起始页码	1016
结束页码	1026
卷号	26 期号:4
英文摘要	The Dala two-mica granite intruded into the Yardoi gneiss dome and is located to the southeastern of the Yardoi gneiss dome. It consists of quartz, plagioclase, and K-feldspar with subordinate biotite and muscovite and formed at similar to 44.0Ma. Geochemical data show that the Dala granite has (1) high Al2O3(16.0% similar to 17.0%), Na2O/K2O ratios (>1.20) and A/CNK(>1.05); (2) highly enriched in LREE ((La/Yb)(N) =39.5 similar to 45.5) and depleted in HREE ((Gd/Yb)(N) =5.5 similar to 6.4), slightly negative or no Eu anomalies; (3) relatively high Sr concentrations (355 x 10(-6) similar to 416 x 10(-6)) and Sr/Y ratios (>59.0); (4) relatively radiogenic Sr (Sr-87/Sr-86(i) =0.71754 similar to 0.71785) and unradiogenic Nd (epsilon(Nd)(i) = -9.2 similar to -12.4) isotope compositions, similar to those in the younger (similar to 35 Ma) leucogranites within the Yardoi gneiss dome. High Sr/Y and (La/Yb) N ratios, and Sr contents, but low Y and HREE concentrations in the Dala granite suggests it is of an adakitic composition. Our data suggest that the Dala granite was derived from partial melting of mafic lower crustal materials in the overthickened Himalayan orogenic belt, and amphibolite melting was dominant in the early stages of Himalayan magmatism.
关键词	HIGH-FIELD-STRENGTH SLAB-DERIVED MELTS YARDOI GNEISS DOME LANGTANG VALLEY METAMORPHIC SEQUENCE TETHYAN HIMALAYA RARE-EARTH CRUST ORIGIN ANATEXIS
英文关键词	Dala pluton; Yardoi gneiss dome; Two-mica granite; Partial melting; Northern Himalayan Gneiss Dome
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000277950600002
来源期刊	ACTA PETROLOGICA SINICA
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257738
推荐引用方式 GB/T 7714	Xie KeJia,Zeng LingSen,Liu Jing,et al. Late-Eocene Dala adakitic granite, southern Tibet and geological implications.[J]. 中国科学院青藏高原研究所,2010,26(4).
APA	Xie KeJia,Zeng LingSen,Liu Jing,&Gao LiE.(2010).Late-Eocene Dala adakitic granite, southern Tibet and geological implications..ACTA PETROLOGICA SINICA,26(4).
MLA	Xie KeJia,et al."Late-Eocene Dala adakitic granite, southern Tibet and geological implications.".ACTA PETROLOGICA SINICA 26.4(2010).