苏北盆地新生代玄武岩中橄榄岩包体的含水性

雷能忠; 夏群科; 郝艳涛; 李佩; 冯敏

Volume 34 Issue 1

Jan. 2009

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LEI Neng-zhong, XIA Qun-ke, HAO Yan-tao, LI Pei, FENG Min, 2009. Water Contents in Peridotite Xenoliths from Subei Basin, Eastern China. Earth Science, 34(1): 75-88.

Citation:

LEI Neng-zhong, XIA Qun-ke, HAO Yan-tao, LI Pei, FENG Min, 2009. Water Contents in Peridotite Xenoliths from Subei Basin, Eastern China. Earth Science, 34(1): 75-88.

LEI Neng-zhong, XIA Qun-ke, HAO Yan-tao, LI Pei, FENG Min, 2009. Water Contents in Peridotite Xenoliths from Subei Basin, Eastern China. Earth Science, 34(1): 75-88.

Citation:

LEI Neng-zhong, XIA Qun-ke, HAO Yan-tao, LI Pei, FENG Min, 2009. Water Contents in Peridotite Xenoliths from Subei Basin, Eastern China. Earth Science, 34(1): 75-88.

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Water Contents in Peridotite Xenoliths from Subei Basin, Eastern China

LEI Neng-zhong^{1, 2},
XIA Qun-ke^{2
,
,},
HAO Yan-tao³,
LI Pei²,
FENG Min²

1.
Department of City Construction and Environmental Science, West Anhui University, Liu'an 237012, China
2.
CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
3.
Department of Geology, University of Ferrara, Ferrara 44100, Italy

Received Date: 2008-10-23
Publish Date: 2009-01-25

Abstract

Abstract

Nominally anhydrous minerals, clinopyroxene (Cpx), orthopyroxene (Opx) and olivine (Ol), in peridotite xenoliths hosted by Cenozoic basalts from Panshishan, Lianshan and Fangshan of the Subei basin, eastern China have been investigated by Micro-FTIR for their water contents.All Cpx and Opx grains contain a certain amount of "water" as hydroxyl defect in the crystal structure.Water contents (expressed as H₂O wt.) of Cpx and Opx from Panshishan, Lianshan and Fangshan peridotites are 64×10^-6-183×10^-6, 37×10^-6-102×10^-6, 41×10^-6-177×10^-6 and 16×10^-6-61×10^-6, 13×10^-6-45×10^-6, 21×10^-6-74×10^-6, respectively.OH peaks can not be detected for almost all olivine grains, indicating that the water content is below the detection limit (~2×10^-6) of FTIR.The whole rock water contents calculated according to the water contents of minerals and their volume proportions are 12×10^-6-52×10^-6, 7×10^-6-25×10^-6 and 13×10^-6-44×10^-6 for Panshishan, Lianshan and Fangshan respectively.Based on the new results from the Subei basin and the data reported in literatures, the partition coefficient of H₂O between Cpx and Opx in the continental lithosphere mantle is estimated to be 2.2±0.4.Peridotite xenoliths from Nüshan, Hannuoba and the Subei basin of the North China block have much lower water contents than those from other localities of the world (South Africa craton, New Mexico, Colorado plateau and basin and Range province of USA, South Mexico, French Central Massif and West Kettle of Canada).This difference is probably induced by the thermal erosion of asthenosphere during Mesozoic-Cenozoic period in the North China block.If this explanation is correct, the present lithosphere mantle in the North China block is mainly the relict after the Mesozoic lithospheric thinning, rather than the new accreted mantle.
- micro-FTIR,
- water,
- peridotite xenoliths,
- Subei basin,
- North China craton

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References(50)

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