Protolith and ultranhigh-pressure (UHP) metamorphic ages of ultramafic rocks in Weihai area, North Sulu UHP terrane

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	Protolith and ultranhigh-pressure (UHP) metamorphic ages of ultramafic rocks in Weihai area, North Sulu UHP terrane
	Liu, FL (Liu FuLai); Shi, JR (Shi JianRong); Liu, JH (Liu JianHui); Ye, JG (Ye JianGuo); Liu, PH (Liu PingHua); Wang, F (Wang Fang)
刊名	ACTA PETROLOGICA SINICA
	2011
卷号	27 期号:4 页码:1075-1084
关键词	Zircon Ultramafic rock U-Pb dating LA-ICP-MS Weihai Sulu UHP metamorphic terrane
ISSN号	1000-0569
英文摘要	Ultramafic rocks as irregular lenses and blocks are commonly identified within gneissic rocks in the Sulu ultrahigh-pressure (UHP) metamorphic terrane, eastern China. A combined study of mineral inclusions, cathodoluminescence (CL) images, and in situ U-Pb LA-ICP-MS dates of zircons provided insight into the protolith and UHP metamorphic ages of these rocks. Zircon grains separated from olivine-bearing pyroxenite (samples W1 and W2) in Weihai area, North Sulu can be subdivided into three types (1) inherited ( magmatic) zircons with clear magmatic CL images and Ol + Cpx + Ap inclusions, which record Paleoproterozoic protolith ages of 1835 similar to 1845Ma; (2) some inherited zircons with blurry CL images and Ol + Cpx + Ap inclusions give a younger age group of 250 similar to 784Ma related to partial recrystallization and Pb loss during late magmatic and metamorphic events; and ( 3) metamorphic zircons with homogeneous CL images and Grt + Cpx inclusions that record UHP metamorphism at 230 similar to 234Ma, which are consistent with the UHP ages (235 similar to 225Ma) recorded by the coesite-bearing zircons from eclogite and its country-rocks in Sulu UHP terrane. Existence of UHP metamorphic zircons in ultramafic rocks indicates that the fluid may play an important role in the UHP metamorphic process of the Sulu terrane. The results from this study not only exactly constrain the protolith and UHP metamorphic ages of ultramafic rocks, but also show important significance for an in-depth insight into of the fluid property and evolution feature, fluid-rock interaction mechanism in the Sulu-Dabie UHP terrane.
学科主题	变质岩岩石学
WOS关键词	COESITE-BEARING ZIRCON ; U-PB AGES ; ULTRAHIGH-PRESSURE ; EASTERN CHINA ; TRACE-ELEMENTS ; GARNET PERIDOTITES ; MINERAL INCLUSIONS ; FORBIDDEN ZONE ; SHRIMP ; GEOCHRONOLOGY
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000290080200014
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39338]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Liu, FL ,Shi, JR ,Liu, JH ,et al. Protolith and ultranhigh-pressure (UHP) metamorphic ages of ultramafic rocks in Weihai area, North Sulu UHP terrane[J]. ACTA PETROLOGICA SINICA,2011,27(4):1075-1084.
APA	Liu, FL ,Shi, JR ,Liu, JH ,Ye, JG ,Liu, PH ,&Wang, F .(2011).Protolith and ultranhigh-pressure (UHP) metamorphic ages of ultramafic rocks in Weihai area, North Sulu UHP terrane.ACTA PETROLOGICA SINICA,27(4),1075-1084.
MLA	Liu, FL ,et al."Protolith and ultranhigh-pressure (UHP) metamorphic ages of ultramafic rocks in Weihai area, North Sulu UHP terrane".ACTA PETROLOGICA SINICA 27.4(2011):1075-1084.