| Petrography and Geochemistry of Peridotite Xenoliths from Hannuoba and Significance for Lithospheric Mantle Evolution |
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| 作者姓名： | 余淳梅 郑建平 Griffin W L |
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| 作者单位： | Facultyof Earth Sciences China University of Geosciences Wuhan430074 China，Facultyof Earth Sciences China University of Geosciences Wuhan430074 China State KeyLaboratoryof Geological Processes and Mineral Resources China University of Geosciences Wuhan430074 China，GEMOC Department of Earth and Planetary Sciences Macquarie University Sydney NSW2109 Australia |
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| 基金项目： | This paper is supported by the Research Foundation for OutstandingYoung Teachers , China University of Geosciences ( Wuhan )(CUGQNL0510)，the National Natural Science Foundation of China(No .40425002) . |
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| 摘 要： | Mantle-derived xenoliths and xenocrysts in Pale-ozoic diamondiferous ki mberlites in Mengyin (Shan-dong Province) and Fuxian (Liaoning Province) showthe presence of a cold,thick lithospheric mantle be-neath the North China craton ( NCC) in the MiddleOrdovician ( Griffin et al ., 1998 ; Menzies et al .,1993 ;Fan and Menzies ,1992) . However ,studies onmantle peridotites captured in the Tertiary to Neo-gene basalts of the NCC have revealed the existenceof a thin, hot and fertile lithosph…
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| 关 键 词： | 岩石记述学 地幔 克拉通 岩相 橄榄岩 |
| 收稿时间： | 2005-10-20 |
| 修稿时间： | 2005-12-18 |
Petrography and Geochemistry of Peridotite Xenoliths from Hannuoba and Significance for Lithospheric Mantle Evolution |
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| Yu Chunmei,Zheng Jianping,Griffin W L.Petrography and Geochemistry of Peridotite Xenoliths from Hannuoba and Significance for Lithospheric Mantle Evolution[J].Journal of China University of Geosciences,2006,17(1):25-33. |
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| Authors: | Yu Chunmei Zheng Jianping Griffin W L |
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| Institution: | 1. Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Koptyug ave 3, Novosibirsk 630090, Russia;2. Novosibirsk State University, Pirogova str 2, Novosibirsk 630090, Russia;3. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, Akademgorodok 50, bld. 38, Krasnoyarsk 660036, Russia |
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| Abstract: | The compositions of the whole rocks and trace elements of minerals in peridotites can reflect the characteristics of the lithospheric mantle. The nature and evolution of the Cenozoic lithospheric mantle beneath Hannuoba , located on the north edge of the intra-North China orogenic belt, are discussed based on the in-situ LAM-ICPMS detected trace element compositions of clinopyroxenes in the Hannuoba peridotitic xenoliths combined with detailed petrography and geochemistry studies. The Hannuoba lithospheric mantle was formed by different partial meltings of the primitive mantle. Most of the samples reflect the partial melting degree of lower than 5% with a few samples of 15%-20%. Major element compositions of the whole rocks and geochemical compositions of clinopyroxenes reveal the coexistence of both fertile and depleted mantle underneath the Hannuoba region during the Cenozoic. This was probably caused by the asthenospheric mantle replacing the aged craton mantle through erosion, intermingling and modification. Our conclusion is further supported by the existence of both carbonatitic magmatic material and silicate melt/fluid metasomatism as magnified by the trace elements of the clinopyroxenes from the Hannuoba lithospheric mantle. |
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| Keywords: | peridotite xenoliths LAM-ICPMS lithospheric mantle evolution Hannuoba North China craton |
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