The possible subduction of continental material to depths greater than 200 km

	The possible subduction of continental material to depths greater than 200 km
	Ye, K; Cong, BL; Ye, DI
刊名	NATURE
	2000-10-12
卷号	407 期号:6805 页码:734-736
ISSN号	0028-0836
文献子类	Article
英文摘要	Determining the depth to which continental lithosphere can be subducted into the mantle at convergent plate boundaries is of importance for understanding the long-term growth of supercontinents as well as the dynamic processes that shape such margins. Recent discoveries of coesite and diamond in regional ultrahigh-pressure (UHP) metamorphic rocks has demonstrated that continental material can be subducted to depths of at least 120 km (ref. 1), and subduction to depths of 150-300 km has been inferred from garnet peridotites in orogenic UHP belts based on several indirect observations(2-5). But continental subduction to such depths is difficult to trace directly in natural UHP metamorphic crustal rocks by conventional mineralogical and petrological methods because of extensive late-stage recrystallization and the lack of a suitable pressure indicator. It has been predicted from experimental work, however, that solid-state dissolution of pyroxene should occur in garnet at depths greater than 150 km (refs 6-8). Here we report the observation of high concentrations of clinopyroxene, rutile and apatite exsolutions in garnet within eclogites from Yangkou in the Sulu UHP metamorphic belt, China. We interpret these data as resulting from the high-pressure formation of pyroxene solid solutions in subducted continental material. Appropriate conditions for the Na2O concentrations and octahedral silicon observed in these samples are met at depths greater than 200 km.
WOS关键词	HIGH-PRESSURE ; 300 KILOMETERS ; EASTERN CHINA ; ALPE-ARAMI ; ECLOGITE ; TRANSFORMATION ; PERIDOTITE ; ISOTOPE ; GARNETS ; DIAMOND
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	MACMILLAN PUBLISHERS LTD
WOS记录号	WOS:000089773900039
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/76401]
专题	中国科学院地质与地球物理研究所
通讯作者	Ye, K
作者单位	Chinese Acad Sci, Inst Geol & Geophys, Lab Lithosphere Tecton Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Ye, K,Cong, BL,Ye, DI. The possible subduction of continental material to depths greater than 200 km[J]. NATURE,2000,407(6805):734-736.
APA	Ye, K,Cong, BL,&Ye, DI.(2000).The possible subduction of continental material to depths greater than 200 km.NATURE,407(6805),734-736.
MLA	Ye, K,et al."The possible subduction of continental material to depths greater than 200 km".NATURE 407.6805(2000):734-736.