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Continental and Oceanic Crust Recycling-induced Melt-Peridotite Interactions in the Trans-North China Orogen: U-Pb Dating, Hf Isotopes and Trace Elements in Zircons from Mantle Xenoliths
Liu, Yongsheng; Gao, Shan; Hu, Zhaochu; Gao, Changgui; Zong, Keqing; Wang, Dongbing
2010
Source Publication5th Lherzolite Conference
Volume51Issue:1-2Pages:537-571
Abstract

We present the first finding of continental crust-derived Precambrian zircons in garnet/spinel pyroxenite veins within mantle xenoliths carried by the Neogene Hannuoba basalt in the central zone of the North China Craton (NCC). Petrological and geochemical features indicate that these mantle-derived composite xenoliths were formed by silicic melt-lherzolite interaction. The Precambrian zircon ages can be classified into three age groups of 2 center dot 4-2 center dot 5 Ga, 1 center dot 6-2 center dot 2 Ga and 0 center dot 6-1 center dot 2 Ga, coinciding with major geological events in the NCC. These Precambrian zircons fall in the field of continental granitoid rocks in plots of U/Yb vs Hf and Y. Their igneous-type REE patterns and metamorphic zircon type CL images indicate that they were not crystallized during melt-peridotite interaction and subsequent high-pressure metamorphism. The similar to 2 center dot 5 Ga zircons have positive epsilon(Hf(t)) values (2 center dot 9-10 center dot 6), whereas the younger Precambrian zircons are dominated by negative epsilon(Hf(t)) values, indicating an ancient continental crustal origin. These observations suggest that the Precambrian zircons were xenocrysts that survived melting of recycled continental crustal rocks and were then injected with silicate melt into the host peridotite. In addition to the Precambrian zircons, igneous zircons of 315 +/- 3 Ma (2 Sigma), 80-170 Ma and 48-64 Ma were separated from the garnet/spinel pyroxenite veins; these provide evidence for lower continental crust and oceanic crust recycling-induced multi-episodic melt-peridotite interactions in the central zone of the NCC. The combination of the positive epsilon(Hf(t)) values (2 center dot 91-24 center dot 6) of the 315 Ma zircons with the rare occurrence of 302-324 Ma subduction-related diorite-granite plutons in the northern margin of the NCC implies that the 315 Ma igneous zircons might record melt-peridotite interactions in the lithospheric mantle induced by Palaeo-Asian oceanic crust subduction. Igneous zircons of age 80-170 Ma generally coexist with the Precambrian metamorphic zircons and have lower Ce/Yb and Th/U ratios, higher U/Yb ratios and greater negative Eu anomalies. The epsilon(Hf(t)) values of these zircons vary greatly from -47 center dot 6 to 24 center dot 6. The 170-110 Ma zircons are generally characterized by negative epsilon(Hf(t)) values, whereas the 110-100 Ma zircons have positive epsilon(Hf(t)) values. These observations suggest that melt-peridotite interactions at 80-170 Ma were induced by partial melting of recycled continental crust. The 48-64 Ma igneous zircons are characterized by negligible Ce anomalies, unusually high REE, U and Th contents, and positive epsilon(Hf(t)) values. These features imply that the melt-peridotite interactions at 48-64 Ma could be associated with a depleted mantle-derived carbonate melt or fluid.

Keywordcomposite xenoliths zircon U-Pb age Hf isotope crust recycling melt-peridotite interaction North China Craton
DOI10.1093/petrology/egp082
Language英语
ISSN0022-3530
Indexed BySCI
WOS IDWOS:000273893000023
WOS SubjectGeochemistry & Geophysics
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
Citation statistics
Cited Times:3220[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.cug.edu.cn/handle/2XU834YA/275898
Collection教学院系_数学与物理学院
Corresponding AuthorLiu, Yongsheng
Affiliation1.China Univ Geosci, Fac Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China.
2.NW Univ Xian, State Key Lab Continental Dynam, Xian 710069, Peoples R China.
Recommended Citation
GB/T 7714
Liu, Yongsheng,Gao, Shan,Hu, Zhaochu,et al. Continental and Oceanic Crust Recycling-induced Melt-Peridotite Interactions in the Trans-North China Orogen: U-Pb Dating, Hf Isotopes and Trace Elements in Zircons from Mantle Xenoliths[J]. 5th Lherzolite Conference,2010,51(1-2):537-571.
APA Liu, Yongsheng,Gao, Shan,Hu, Zhaochu,Gao, Changgui,Zong, Keqing,&Wang, Dongbing.(2010).Continental and Oceanic Crust Recycling-induced Melt-Peridotite Interactions in the Trans-North China Orogen: U-Pb Dating, Hf Isotopes and Trace Elements in Zircons from Mantle Xenoliths.5th Lherzolite Conference,51(1-2),537-571.
MLA Liu, Yongsheng,et al."Continental and Oceanic Crust Recycling-induced Melt-Peridotite Interactions in the Trans-North China Orogen: U-Pb Dating, Hf Isotopes and Trace Elements in Zircons from Mantle Xenoliths".5th Lherzolite Conference 51.1-2(2010):537-571.
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