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The contribution of the Precambrian continental lithosphere to global H_2 production

机译：前寒武纪大陆岩石圈对全球H_2产量的贡献

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Microbial ecosystems can be sustained by hydrogen gas (H_2)-producing water-rock interactions in the Earth's subsurface and at deep ocean vents. Current estimates of global H_2 production from the marine lithosphere by water-rock reactions (hydration) are in the range of 10~(11) moles per year. Recent explorations of saline fracture waters in the Precambrian continental subsurface have identified environments as rich in H_2 as hydro thermal vents and seafloor-spreading centres and have suggested a link between dissolved H_2 and the radiolytic dissociation of water. However, extrapolation of a regional H_2 flux based on the deep gold mines of the Witwatersrand basin in South Africa yields a contribution of the Precambrian lithosphere to global H_2 production that was thought to be negligible (0.009 × 10~(11) moles per year). Here we present a global compilation of published and new H_2 concentration data obtained from Precambrian rocks and find that the H_2 production potential of the Precambrian continental lithosphere has been underestimated. We suggest that this can be explained by a lack of consideration of additional H_2-producing reactions, such as serpentinization, and the absence of appropriate scaling of H_2 measurements from these environments to account for the fact that Precambrian crust represents over 70 per cent of global continental crust surface area. If H_2 production via both radiolysis and hydration reactions is taken into account, our estimate of H_2 production rates from the Precambrian continental lithosphere of 0.36-2.27 × 10~(11) moles per year is comparable to estimates from marine systems.
机译：微生物生态系统可以通过在地球地下和深海喷口中产生氢气（H_2）的水-岩石相互作用来维持。目前对水岩石反应（水化）从海洋岩石圈产生的全球H_2产量的估计范围为每年10〜（11）摩尔。在前寒武纪大陆地下盐溶裂隙水的最新勘探中，发现了H_2作为热气喷口和海底扩散中心的环境十分丰富，并提出了溶解的H_2与水的辐射解离之间的联系。然而，根据南非威特沃特斯兰德盆地深金矿的区域H_2通量推断得出前寒武纪岩石圈对全球H_2产量的贡献可被认为是微不足道的（每年0.009×10〜（11）摩尔） 。在这里，我们介绍了从前寒武纪岩石中获得的已发布和新的H_2浓度数据的全球汇编，发现前寒武纪大陆岩石圈的H_2生产潜力被低估了。我们建议，这可以通过以下原因来解释：未考虑其他产生H_2的反应，例如蛇纹石化；以及在这些环境中未适当缩放H_2的测量值，以解释前寒武纪地壳占全球70％以上的事实。大陆壳表面积。如果同时考虑通过辐射分解和水合反应产生的H_2，我们估计的前寒武纪大陆岩石圈的H_2生产率为每年0.36-2.27×10〜（11）摩尔，这与海洋系统的估计值相当。

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  • 来源
    《Nature》 |2014年第7531期|379-382|共4页
  • 作者

    Barbara Sherwood Lollar; T. C. Onstott; G. Lacrampe-Couloume; C. J. Ballentine;

  • 作者单位

    Department of Earth Sciences, 22 Russell Street, University of Toronto, Toronto M5S 3B1, Canada;

    Department of Geosciences, Guyot Hall, Princeton University, Princeton, New Jersey 08544, USA;

    Department of Earth Sciences, 22 Russell Street, University of Toronto, Toronto M5S 3B1, Canada;

    Department of Earth Sciences, South Parks Road, University of Oxford, Oxford OX1 3AN, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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