苏鲁芝麻坊超镁铁岩的岩石成因: 大陆科学钻探卫星孔(CCSD-PP1)岩心研究

杨经绥; 李天福; 张仲明; 陈松永; 张儒媛

Volume 31 Issue 4

Jul. 2006

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Article Navigation > Earth Science > 2006 > 31(4): 437-456

YANG Jing-sui, LI Tian-fu, ZHANG Zhong-ming, CHEN Song-yong, ZHANG Ru-yuan, 2006. Petrogenesis of the Zhimafang Ultramafic Body in the Sulu Ultrahigh Pressure Metamorphic Belt: CCSD-PP1 Core Study. Earth Science, 31(4): 437-456.

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Petrogenesis of the Zhimafang Ultramafic Body in the Sulu Ultrahigh Pressure Metamorphic Belt: CCSD-PP1 Core Study

1.
Key Laboratory for Continental Dynamics, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
Department of Geological and Environmental Sciences, Stan ford University CA94305, USA

Received Date: 2006-06-02
Publish Date: 2006-07-25

Abstract

Abstract

The Zhimafang ultramafie body in the Sulu ultrahigh pressure (UHP) metamorphic belt is a block of unusual mantle composed of highly depleted peridotite,which has been enriched in REE and LILE by metasomatism. It consists of interlayered garnet peridotite and garnet-free peridotite,which have many common compositional features and formed under the same p-T conditions. The rocks record several geological events; however,evidence of progressive metamorphism has not been confirmed. Calculated p-T conditions from equilibrium mineral pairs suggest pressures of 6-7 GPa. Partial melting of the sequence in the Mesoproterozic was probably responsible for the interlayering of the two rock types. AU-Pb zircon age of 220 Ma records the collision between Yangtze and North China blocks,but this age may not represent the time of peak UHP metamorphism. More likely,it records exhumation of the block from the deep portion of the subduction zone. The available data suggest that the garnet was exsolved from enstatite as rocks rose from the deep mantle.
- garnet peridotite,
- Sulu,
- CCSD,
- UHP metamorphism,
- mantle

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References(44)

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