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

苏北盆地新生代玄武岩中橄榄岩包体的含水性

雷能忠^{1, 2},
夏群科^2, ,,
郝艳涛³,
李佩²,
冯敏²

1.
皖西学院城市建设与环境系, 安徽六安 237012
2.
中国科技大学地球和空间科学学院中国科学院, 中国科学院壳幔物质与环境重点实验室, 安徽合肥 230026
3.
意大利费拉拉大学地质系, 意大利 44100

基金项目:

国家自然科学基金 90714009

国家自然科学基金 40673028

国家自然科学基金 40473007

中法先进研究计划金 PRAT05-02

详细信息

作者简介:
雷能忠（1969-）, 男, 副教授, 从事化学和环境科学方向研究.

通讯作者:
夏群科, E-mail: qkxia@ustc.edu.cna

中图分类号: P575.4;P511.3
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出版历程
- 收稿日期: 2008-10-23
- 刊出日期: 2009-01-25

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

摘要

摘要: 对来自苏北盆地盘石山、练山和方山地区新生代玄武岩中的50个橄榄岩包体矿物进行了系统的微区傅立叶变换红外光谱(Micro-FTIR) 分析.结果显示, 所有的单斜辉石和斜方辉石颗粒都含有以OH形式存在的结构水, 盘石山、练山和方山橄榄岩的单斜辉石水含量分别为64×10^-6~183×10^-6、37×10^-6~102×10^-6和41×10^-6~177×10^-6; 斜方辉石水含量分别为16×10^-6~61×10^-6、13×10^-6~45×10^-6和21×10^-6~74×10^-6.几乎所有的橄榄石都没有检测到明显的OH吸收峰, 暗示其水含量低于仪器的检出限(~2×10^-6).根据矿物水含量(假设橄榄石的水含量为2×10^-6) 和它们的体积分数计算的盘石山、练山和方山橄榄岩全岩的水含量分别为12×10^-6~52×10^-6、7×10^-6~25×10^-6和13×10^-6~44×10^-6.结合已经发表的橄榄岩包体的数据来看, 在岩石圈地幔的物理化学条件下, 单斜辉石与斜方辉石之间水的平衡分配系数大约为2.2±0.4.结合已经发表的安徽女山和河北汉诺坝的橄榄岩数据, 对比世界上其他地区橄榄岩的数据来看, 华北的岩石圈地幔具有低的水含量: 华北橄榄岩的单斜辉石水含量多 < 200×10^-6, 而世界上其他地区(包括南非克拉通、美国新墨西哥地区、美国Colorado高原、美国盆岭省地区、墨西哥南部、法国中央地体以及加拿大WestKettle地区) 橄榄岩的单斜辉石水含量多 > 200×10^-6; 华北的斜方辉石水含量多 < 100×10^-6, 而世界上其他地区多 > 100×10^-6; 华北的橄榄岩全岩水含量多 < 50×10^-6, 而世界上其他地区多 > 100×10^-6.华北岩石圈地幔的低水含量有可能是由于上升软流圈的热侵蚀造成的, 因此目前的华北岩石圈地幔可能大部分都是中生代岩石圈减薄后的残余, 而不是新生地幔.
- 红外光谱 /
- 结构水 /
- 橄榄岩 /
- 苏北盆地 /
- 华北
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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图 1 苏北盆地的构造位置和本文的采样地点

Fig. 1. Sketch map showing the Subei basin and the sampling localities

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图 2 苏北盆地橄榄岩中辉石化学成分的相关图解

PSS.盘石山样品; LS.练山样品; FS.方山样品; Mg^#=100 Mg/ (Mg+Fe)

Fig. 2. Covariations among chemical compositions for pyroxenes from the Subei basin

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图 3 苏北盆地橄榄岩中橄榄石Mg^#与尖晶石Cr^#的相关图解

Cr^# (Sp).尖晶石的Cr^#值(=100Cr/ (Cr+Al)); Mg^# (Ol).橄榄石的Mg^#值(=100 Mg/ (Mg+Fe))

Fig. 3. Olivine Mg^# vs. spinel Cr^# for peridotites from the Subei basin

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图 4 苏北盆地橄榄岩中辉石的代表性红外光谱图

图中~3 700~3 800 cm^-1的峰由光源引起的, 2 900 cm^-1的峰是制样过程中残存的树胶引起的, 其余3 000~3 650 cm^-1之间的峰为辉石的结构OH红外吸收峰

Fig. 4. Representative IR spectra of pyroxenes from peridotites of the Subei basin

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图 5 橄榄岩中两种辉石水含量的相关性图解

NS.女山; HNB.汉诺坝, 引自Yang et al. (2008); Bell and Rossman (1992a).样品来自Bell and Rossman (1992b); Peslier et al. (1992).样品来自Peslier et al (2002); Grant (2007).样品来自Grant et al. (2007); Li (2008).样品来自Li et al. (2008)

Fig. 5. Diagram showing the correcation of water contents of clinopyroxene and orthopyroxene from peridotite xenoliths

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图 6 华北橄榄岩水含量与世界其他各地橄榄岩的对比

Off-craton和Craton的数据引自Bell and Rossman (1992); Peslier et al. (2002); Grant et al. (2007)和Li et al. (2008); 3个图依次为单斜辉石、斜方辉石和全岩水含量的对比

Fig. 6. Comparison of the water content of peridotites from the North China block with other localities in the world

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表 1 苏北盆地橄榄岩包体中橄榄石的主要元素组成

Table 1. Olivine compositions of peridotite xenoliths from the Subei basin

表 2 苏北盆地橄榄岩包体中单斜辉石的主要元素组成

Table 2. Clinoproxene compositions of peridotite xenoliths from the Subei basin

表 3 苏北盆地橄榄岩包体中斜方辉石的主要元素组成

Table 3. Orthopyroxene compositions of peridotite xenoliths from the Subei basin

表 4 苏北盆地橄榄岩包体中尖晶石的主要元素组成

Table 4. Spinel compositions of peridotite xenoliths from the Subei basin

表 5 苏北盆地橄榄岩包体矿物和全岩的水含量

Table 5. Water content of minerals and whole-rocks of peridotite xenoliths from the Subei basin

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