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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >CO2 and He-3 in hydrothermal plumes: implications for mid-ocean ridge CO2 flux
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CO2 and He-3 in hydrothermal plumes: implications for mid-ocean ridge CO2 flux

机译：热液羽流中的CO2和He-3：对洋中脊CO2通量的影响

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摘要

Measurements of pH and total carbon dioxide (SigmaCO(2)) from Axial Volcano in the 2 years following its eruption and front the Southern East Pacific Rise from 27degreesS to 32degreesS are used to demonstrate that decreases in pH in hydrothermal plumes at mid-ocean ridges are primarily caused by the emission of CO2-rich hydrothermal fluids. As a result, changes in pH can be directly related to the amount of CO2 added to the hydrothermal plumes. Because hydrothermal plumes integrate the hydrothermal output and chemical signatures from multiple sources in a vent field area, the chemistry in plumes reflects that in fluids being emitted from vent field areas as a whole. We use directly measured CO2, CO2 inferred from changes in pH, and He-3 data to constrain the ratio of CO2/He-3 in hydrothermal plumes along extensive segments of the mid-ocean ridge and over time following a volcanic eruption. There are a limited number of CO2/He-3 values reported for mid-ocean ridge basalts and hydrothermal fluids, and thus the CO2/He-3 ratios determined here greatly increase their geographic and temporal distribution and demonstrate that this ratio is fairly constant along the mid-ocean ridges (MORs), having a value of similar to2X10(9). These data suggest that a large degree of fractionation between He-3 and CO2 does not occur during magmatic degassing, eruption, and hydrothermal circulation.If a CO2/He-3 ratio of 2x10(9) is representative of the ratio found in the mantle beneath the MOR, then hydrothermal fluxes of CO2 can be estimated for the global oceans based on the flux of He-3 from the mantle and MORs. These results suggest a MOR CO2 flux of 0.5-2x10(12) mol year(-1), which is consistent with other estimates. (C) 2004 Elsevier B.V. All rights reserved.
机译：在轴流火山喷发后的2年内以及从东南太平洋上升到27度到32度之间的轴向火山中的pH值和总二氧化碳（SigmaCO（2））的测量结果表明，中海脊热液羽流的pH值降低了主要是由于排放富含CO2的热液造成的。结果，pH的变化可能直接与添加到热液羽流中的CO2量有关。由于热液羽流整合了热源输出和排放场区域中来自多个源的化学特征，因此羽流中的化学反应反映了从排放场区域整体排放的流体中的化学热。我们使用直接测量的CO2，从pH值变化推断出的CO2和He-3数据来限制沿中海脊大段以及火山爆发后随时间推移的热液羽流中CO2 / He-3的比率。报告的中洋脊玄武岩和热液流体的CO2 / He-3值数量有限，因此，此处确定的CO2 / He-3比值极大地增加了它们的地理和时间分布，并表明该比值沿整个过程相当稳定大洋中脊（MOR），其值类似于2X10（9）。这些数据表明，在岩浆脱气，喷发和热液循环过程中，He-3和CO2之间不会发生很大程度的分馏。如果CO2 / He-3比率为2x10（9）代表了地幔中的比率在MOR下方，可以根据来自地幔和MOR的He-3的通量估算全球海洋的CO2热液通量。这些结果表明，MOR CO2通量为0.5-2x10（12）mol年（-1），与其他估计值一致。 （C）2004 Elsevier B.V.保留所有权利。

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