Carbon and hydrogen isotope constraints on degassing of CO2 and H2O in submarine lavas from the Pitcairn hotspot (South Pacific) -: art. no. L02308
Carbon and hydrogen isotope constraints on degassing of CO2 and H2O in submarine lavas from the Pitcairn hotspot (South Pacific) -: art. no. L02308
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DOI：
10.1029/2005gl024907
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发表时间：
2006-01-21
影响因子：
5.2
通讯作者：
Javoy, M
中科院分区：
文献类型：
--
作者：
Aubaud, C;Pineau, F;Javoy, M
对35个海底火山玻璃囊泡中co2 - δ (13)C-(HO)- o -2- δ D的分析表明，在封闭体系脱气之后，开放体系脱气是造成挥发分浓度和同位素比值变化的主要原因。脱气最少的样品允许评估皮特凯恩热点CO2和H2O通量的最小估计：2.24 +/- 0.17 10(4)吨C /年（-1）和1.32 +/- 0.82 10(5)吨H2O /年（-1）。结果还表明，皮特凯恩热点源碳的δ (13)C值可能比洋中脊玄武岩源低-6%左右，低2%。这表明可能有来自下地幔的贡献，也可能有具有不寻常碳同位素特征的脱碳回收物质的参与。
[1] The analysis of CO2-delta(13)C-(HO)-O-2-delta D in vesicles of 35 submarine volcanic glasses reveals that open-system degassing, following closed-system degassing, is responsible for the observed variations in volatile concentration and isotopic ratios. The least degassed samples allow the assessment of minimum estimates for the flux of CO2 and H2O from the Pitcairn hotspot: 2.24 +/- 0.17 10(4) tons C yr(-1) and 1.32 +/- 0.82 10(5) tons H2O yr(-1). The results also suggest that the carbon in the source of the Pitcairn hotspot may have a delta(13)C value around -6%, 2% lower than the source of mid-ocean ridge basalts. This indicates either a possible contribution from the lower mantle or the possible involvement of decarbonated recycled materials with an unusual carbon isotopic signature.