地幔置换作用: 华北两类橄榄岩及其透辉石微量元素对比证据

郑建平; 路凤香; 余淳梅; O'ReillyS Y

Volume 28 Issue 3

May 2003

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Article Navigation > Earth Science > 2003 > 28(3): 235-240

ZHENG Jian-ping, LU Feng-xiang, YU Chun-mei, O'Reilly S Y, 2003. Mantle Replacement: Evidence from Comparison in Trace Elements between Peridotite and Diopside from Refractory and Fertile Mantle, North China. Earth Science, 28(3): 235-240.

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Mantle Replacement: Evidence from Comparison in Trace Elements between Peridotite and Diopside from Refractory and Fertile Mantle, North China

1.
Faculty ofEarth Sciences, China University ofGeosciences, Wuhan 430074, China
2.
Department ofEarth and Planetary Sciences, Macquarie University, Sydney NSW2109

Received Date: 2002-12-30
Publish Date: 2003-05-25

Abstract

Abstract

In the eastern part of the North China block, the refractory peridotite xenoliths in Cenozoic Hebi basalts (Henan Province) are regarded as the shallow relics of the cratonic mantle; while the fertile peridotite xenoliths in Cenozoic Shanwang basalts (Shandong Province) are regarded as the newly accreted mantle. In this paper, a comparison is made between the major and trace elements of the whole rocks and the major elements of the component minerals and the trace elements of the diopsides. The results show that Hebi "cratonic" peridotites and Shanwang "oceanic" ones, respectively, represent the products of 15%-25% and 1%-5% of fractional melting for the primary mantle. These products were metasomated by the silicate carbonatite melt. The mantle metasomatism in the former is stronger than that in the latter. The solidus temperature of the cratonic lithospheric peridotite fell due to the long-term metasomatism of the mantle molten/fluid bodies. The melt underplated at the basement of the lower crust, created the crust-mantle transition zone and resulting in the huge heat and material exchange. The ensuing decreased temperature after Eogene period resulted in the uplifted asthenospheric cooling and underplating at the lithospheric basement for the newly accreted lithosphere. Therefore, the Mesozoic-Cenozoic (relative to Paleozoic) lithospheric thinning did not initiate the simple decrease in lithospheric thickness arising from the asthenospheric upwelling. Instead, this thinning created the replacement process of the accompanying cratonic mantle by the newly accreted one.
- trace element,
- refractory peridotite,
- fertile peridotite,
- mantle replacement,
- North China block

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References(23)

References

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