Water in Peridotite Xenoliths from Niutoushan, Longhai, Fujian
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摘要: 对福建龙海牛头山新生代玄武岩中橄榄岩包体进行了傅利叶变换红外光谱(FTIR)分析，结果显示，二辉橄榄岩中的辉石包体含有结构水，均以OH的形式存在，结构水含量分别如下: 单斜辉石为(151~845)×10-6，斜方辉石为(40~710)×10-6，全岩为(25~90)×10-6.无论是辉石中的水含量还是全岩中的水含量，福建牛头山地区均高于华北克拉通的安徽女山、河北汉诺坝和苏北盆地，而与同是华北克拉通的河北阳原地区水含量相当.实验证明辉石是牛头山地区上地幔重要的水储库.初步推断福建牛头山经历了洋壳俯冲作用及底侵作用.Abstract: The analysis of infrared spectrum of pyroxene in lherzolite from peridotite xenoliths in Niutoushan, Longhai, Fujian, shows that there is water hosted in the pyroxene which exists by OH hydroxyl. The water content of clinopyroxene is (151－845)×10-6, of orthopyroxene is (40－710)×10-6, and of the whole rock (25－90)×10-6 respectively. The water contents, both of pyroxene and of the whole rock, are higher than those in Nühan, Hannuoba and Subei basin, but are almost the same as those in Yangyuan. It demonstrates that pyroxene is the important reservoir in the upper mantle in Niutoushan. It may have experienced oceanic crust subduction and underplating in investigation locality.
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Key words:
- peridotite xenoliths /
- infrared spectroscopy /
- petrology
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图 2 单斜辉石(a)和斜方辉石(b)代表性IR光谱
Fig. 2. The representative infrared spectrum of Cpx (a) and Opx (b)
图 3 包体中单斜辉石与斜方辉石结构水含量相关关系
Fig. 3. Correlations of the water content between Cpx and Opx
表 1 包体中单斜辉石、斜方辉石的电子探针分析
Table 1. Electron microprobe of Cpx and Opx
Cpx(%) Opx(%) FLN1 FLN2 FLN3 FLN4 FLN5 FLN1 FLN2 FLN3 FLN4 FLN5 SiO2 50.50 50.58 50.34 50.47 50.36 53.34 54.04 53.96 53.78 53.69 TiO2 0.39 0.36 0.61 0.45 0.38 0.03 0.03 0.12 0.06 0.05 Al2O3 6.12 6.04 4.35 5.50 5.91 4.66 4.44 4.95 4.68 4.75 FeO 2.98 3.03 2.75 2.92 2.82 6.64 6.84 6.79 6.76 6.82 MnO 0.00 0.00 0.03 0.01 0.00 0.00 0.10 0.00 0.03 0.01 MgO 15.08 15.90 17.21 16.06 16.31 33.41 33.87 33.84 33.70 34.02 CaO 21.90 21.43 23.18 22.17 21.06 0.53 0.58 0.55 0.55 0.56 Na2O 1.58 1.67 0.34 1.20 1.64 0.04 0.04 0.03 0.04 0.03 Cr2O3 0.92 0.73 0.76 0.80 0.78 0.22 0.28 0.29 0.27 0.26 Total 99.46 99.74 99.55 99.59 99.26 98.87 100.21 100.54 99.87 100.19 Si 1.86 1.85 1.85 1.85 1.85 1.87 1.87 1.86 1.87 1.86 Ti 0.01 0.01 0.02 0.01 0.01 0.00 0.00 0.00 0.00 0.00 Al 0.27 0.26 0.19 0.24 0.26 0.19 0.18 0.20 0.19 0.19 Fe 0.09 0.09 0.08 0.09 0.09 0.19 0.20 0.20 0.20 0.20 Mn 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Mg 0.83 0.87 0.94 0.88 0.89 1.75 1.75 1.74 1.75 1.76 Ca 0.86 0.84 0.91 0.87 0.83 0.02 0.02 0.02 0.02 0.02 Na 0.11 0.12 0.02 0.09 0.12 0.00 0.00 0.00 0.00 0.00 Cr 0.03 0.02 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01 Total 4.06 4.07 4.05 4.06 4.07 4.03 4.04 4.03 4.04 4.04 Mg# 90.22 90.63 92.16 90.72 91.16 90.21 89.74 89.69 89.74 89.89 
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表 2 福建牛头山橄榄岩中辉石结构水含量
Table 2. Water content of pyroxene of peridotite xenoliths from Niutoushan, Fujian
样品号 体积分数(%) 水含量(10-6) Cpx Opx Ol Cpx Opx WR FLN1 7 16 77 376 75 49 FLN2 6 18 76 404 189 68 FLN3 5 13 82 239 87 29 FLN4 4 5 91 845 710 90 FLN5 10 16 74 151 40 25
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表 3 安徽女山、河北汉诺坝、苏北盆地、河北阳原和福建牛头山Cpx、Opx Al含量与Mg#值对比
Table 3. Comparison of Al and Mg# among Nüshan, Hannuoba, Subei basin, Yangyuan, Niutoushan
地区 Cpx Opx Al2O3(%) Mg# Al2O3(%) Mg# 安徽女山 6.12~8.07 87.40~90.90 3.10~6.19 88.10~91.40 河北汉诺坝 2.65~6.44 90.45~92.39 2.72~4.15 89.26~91.40 苏北盆地 2.11~7.94 89.06~93.72 1.77~6.33 89.77~92.34 河北阳原 3.82~7.39 89.97~91.87 3.00~4.64 90.71~91.87 福建牛头山 4.35~6.12 90.22~92.16 4.44~4.95 89.69~90.21
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表 4 安徽女山、河北汉诺坝、苏北盆地、河北阳原和福建牛头山Cpx、Opx结构OH的特征吸收谱带
Table 4. Absorption bands of OH in Cpx and Opx at Nüshan, Hannuoba, Subei basin, Yangyuan, Niutoushan
地区 IR光谱OH特征峰(cm-1) Cpx Opx 安徽女山 3 620 520 440主特征峰3 620 3 580 510 410 310主特征峰3 580 河北汉诺坝 3 620 540 460主特征峰3 620 3 580 510 410 290主特征峰3 580 苏北盆地 3 620 520 440主特征峰3 620 3 580 510 410 310主特征峰3 580 河北阳原 3 634\ 主特征峰3 634 3 589 523 421主特征峰3 589 福建牛头山 3 633 600 514 461主特征峰3 633 3 580 518 408\ 3 302 200 053主特征峰3 580
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