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	SHRIMP zircon U/Pb dating on ultrahigh pressure rocks from Yangkou: Implications for the timing of partial melting in the Sulu UHP metamorphic belt
	Zeng LingSen; Gao LiE; Yu JunJie; Hu GuYue
通讯作者	Zeng, LS (通讯作者)
发表日期	2011
ISSN	1000-0569
EISSN	2095-8927
起始页码	1085
结束页码	1094
卷号	27 期号:4
英文摘要	Fertile components in UHP rocks could undergo partial melting at both water-present or -absent conditions during deep subduction as well as early stages of rapid exhumation of continental materials. Petrographic and geochemical observations had shown that the Sulu UHP rocks experienced partial melting at UHP-HP conditions, which led to the formation of quartzo-feldspathic inclusions, granitic veins or plutons, and substantial geochemical effects. To further constrain the timing of these partial melting events, we have carried out SHRIMP zircon U/Pb dating on UHP metapelite as well as concordant K-rich granitic dike from Yangkou, Shandong Province. Zircon separates from boils samples have core-mantle-rim structure. Zircon cores from metapelite yield Pb-206/U-238 ages greater than 282Ma, which represents different crustal components incorporated into the protiolith of metapelite. The mantle and rim yield Pb-206/U-238 ages of 233 +/- 3Ma and 214 +/- 4Ma, representing the timing of UHP and amphibolite facies retrograde reactions, respectively. Zircon grains from the synkinematic peraluminous granitic dike ( A/CNK = 1. 2) yield similarly wide range Pb-206/U-238 ages (483 similar to 800Ma) from the core, implying that it might be derived from metasediments like sample SYK08-08. Except for one spot from the mantle yields Pb-206/U-238 age of 234. 6 +/- 3. 9Ma, all the other spots cluster around a concordant Pb-206/U-238 age of 220. 8 +/- 2. 9Ma. These mantle domains also contain mineral inclusions of Pl + Kfs + Qtz + Ap, typical of granitic composition. Such an association indicates that the Sulu UHP metasediments underwent partial melting at similar to 221Ma and prior to the widespread amphibolite facies retrograde metamorphism.
关键词	COESITE-BEARING ECLOGITE YARDOI GNEISS DOME U-PB EASTERN CHINA SOUTHERN TIBET CONTINENTAL COLLISION ISOTOPE GEOCHEMISTRY GARNET-PERIDOTITE DABIE MOUNTAINS LU REGION
英文关键词	Ultrahigh pressure metamorphism; Partial melting; SHRIMP zircon U/Pb dating; Sulu UHP belt
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000290080200015
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/257876
推荐引用方式 GB/T 7714	Zeng LingSen,Gao LiE,Yu JunJie,et al. SHRIMP zircon U/Pb dating on ultrahigh pressure rocks from Yangkou: Implications for the timing of partial melting in the Sulu UHP metamorphic belt[J]. 中国科学院青藏高原研究所,2011,27(4).
APA	Zeng LingSen,Gao LiE,Yu JunJie,&Hu GuYue.(2011).SHRIMP zircon U/Pb dating on ultrahigh pressure rocks from Yangkou: Implications for the timing of partial melting in the Sulu UHP metamorphic belt.ACTA PETROLOGICA SINICA,27(4).
MLA	Zeng LingSen,et al."SHRIMP zircon U/Pb dating on ultrahigh pressure rocks from Yangkou: Implications for the timing of partial melting in the Sulu UHP metamorphic belt".ACTA PETROLOGICA SINICA 27.4(2011).