Helium and Argon Isotopic Compositions of Various Crustal Layers of a Co-Rich Fe-Mn Crust from Central Pacific
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摘要: 对中太平洋MH海山富钴结壳不同壳层样品的稀有气体同位素丰度与组成测定结果表明: 富钴结壳中He同位素组成类似于深海沉积物, 主要来源于宇宙尘, 其3He含量由老到新呈现基本稳定的特征, 但在8 Ma时3He含量明显增加, 是其他样品的4~5倍, 与深海沉积物中3He含量在8 Ma达到最大值相吻合.在未磷酸盐化壳层中, D4、D5、D7的3He/4He比值也与深海沉积物的3He/4He比值(n×102 Ra)相当.磷酸盐化壳层中3He/4He比值相对较低, 是由于磷酸盐化过程中生成的碳氟磷灰石中富集4He而贫3He, 从而引起磷酸盐化壳层中4He含量明显增加, 导致磷酸盐化壳层3He/4He比值降低.结壳中结构相对疏松的壳层有利于对Ar的吸附, 大部分Ar可能是在结壳生长过程中从周围海水中直接吸附到结壳中的.Abstract: The noble gas isotopes abundance and composition were determined for various layers of a Co-rich Fe-Mn crust from seamount MH in the central Pacific. The He isotopic compositions of this Co-rich crust are similar to those of the abyssal sediments, and are mainly originated from the cosmic dust. 3He contents of the Co-rich crust are nearly constant throughout the section, but the 3He content increases significantly in 8 Ma, which is 4-5 times those of other samples, which responds to the 3He content maximum of the abyssal sediment in 8 Ma. In non-phosphatized Fe-Mn crust layers, the 3He/4He ratios of D4, D5 and D7 are also equivalent to the 3He/4He values n×102 Ra of the abyssal sediments. The 3He/4He ratios in phosphatized layers are relatively low, which resulted from incorporation of carbonate fluorapatite concentrates with enriched 4He, and depleted 3He during phosphatization. The loose layers of the Fe-Mn crust are relatively advantageous to adsorbing of Ar, and the majority of Ar in the crust possibly adsorbs directly from ambient sea water in the crust growth process.
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Key words:
- central Pacific /
- Co-rich crust /
- He isotope /
- Ar isotope /
- sediments /
- geochemistry
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图 2 富钴结壳MHD79 He含量及3He/4He比值
Fig. 2. Co-rich crust MHD79 He contents and 3He/4He values
图 5 深海沉积物中3He通量与富钴结壳MHD79的3He含量关系图解
Fig. 5. 3He flux of the abyssal sediments and 3He contents of Co-rich crust MHD79 relation diagram
表 1 富钴结壳MHD79 He、Ar同位素组成
Table 1. Co-rich crust MHD79 He, Ar isotopes composition
编号 层位 年代(Ma) 3He/4He(10-6) R/Ra He(10-8 cm3/g) 3He(10-16 cm3/g) 40Ar/36Ar 38Ar/36Ar Ar(10-6 cm3/g) D1 Ⅰ 71 26.08±0.24 18.63 215.91 5.63 263.90 0.143 4 2.53 D2 Ⅱ 66 12.17±0.33 8.69 167.82 2.04 249.77 0.139 7 1.70 D3 Ⅲ 57 13.52±0.16 9.66 355.80 4.81 295.45 0.187 2 222.79 D4 Ⅳ 41 429.90±6.53 307.07 7.77 3.34 291.38 0.186 7 1 393.64 D5 Ⅴ 29 314.92±3.87 224.94 10.44 3.29 292.24 0.188 2 715.48 D6 Ⅵ 8 5 112.09±92.02 3 651.49 2.89 14.70 270.41 0.164 1 2.55 D7 Ⅵ 0 704.13±11.62 502.95 3.65 2.57 288.67 0.151 7 1.30 注：年代数据依据 Li et al.(2008) ，并利用Co通量定年法内插得出；R为样品的3He/4He实测值；文中数据在标准大气压条件下测得，下同.
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