Geochemistry and genesis of Nabang metamorphic basalt, southwest Yunnan, China: implications for the subducted slab break-off.

	Geochemistry and genesis of Nabang metamorphic basalt, southwest Yunnan, China: implications for the subducted slab break-off.
	Ji, JQ ; Zhong, DL ; Chen, CY
刊名	ACTA PETROLOGICA SINICA
	2000-08-01
卷号	16 期号:3 页码:433-442
关键词	metamorphic basalt oceanic relict Myitkyina suture slab break-off Nabang west Yunnan
ISSN号	1000-0569
文献子类	Article
英文摘要	The Nabang metamorphic basalt is discovered recently on the border of China and Burma. The majoy, trace and rare earth element characteristics of Nabang metamorphic basalt have been investigated. All studied socks are depleted in light rare earth elements (LREE) with Sigma REE= 24 similar to 50 mu g/g, (La/Sm)(N) = 0.43 similar to 0.75 the same and (La/Yb)(N) = 0.45 similar to 0.74. Ti2O, Nb and Ta show that the Nabang metamorphic rocks are different from island-are basalt as shown by the geochemical diagrams. The Nd-Sr isotope data show a clear signature of a depleted mantle source similar to N-MORB with Sr-87/Sr-86 = 0.704 similar to 0.705, Nd-143/Nd-144 = 0.5129 similar to 0.5132. epsilon(Nd) = +4.85 similar to +9.67. Combining with its geochronological results and geological background, it can be concluded that the Nabang metamorphic basalt is related to Myitkyina suture, east Burma. The Nabang metamorphic basalt may be an evidence of slab-breakoff of Neo-Tethys subducted upper oceanic crust.
WOS关键词	EXHUMATION ; MECHANISM
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000089084300017
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/76257]
专题	中国科学院地质与地球物理研究所
通讯作者	Ji, JQ
作者单位	1.Peking Univ, Dept Geol, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Kunming Sci & Technol Univ, Dept Land & Source, Kunming 650093, Peoples R China
推荐引用方式 GB/T 7714	Ji, JQ,Zhong, DL,Chen, CY. Geochemistry and genesis of Nabang metamorphic basalt, southwest Yunnan, China: implications for the subducted slab break-off.[J]. ACTA PETROLOGICA SINICA,2000,16(3):433-442.
APA	Ji, JQ,Zhong, DL,&Chen, CY.(2000).Geochemistry and genesis of Nabang metamorphic basalt, southwest Yunnan, China: implications for the subducted slab break-off..ACTA PETROLOGICA SINICA,16(3),433-442.
MLA	Ji, JQ,et al."Geochemistry and genesis of Nabang metamorphic basalt, southwest Yunnan, China: implications for the subducted slab break-off.".ACTA PETROLOGICA SINICA 16.3(2000):433-442.