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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 >Clay minerals trap hydrogen in the Earth's crust: Evidence from the Cigar Lake uranium deposit, Athabasca
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Clay minerals trap hydrogen in the Earth's crust: Evidence from the Cigar Lake uranium deposit, Athabasca

机译：粘土矿物质在地壳中捕获氢气：来自雪茄湖铀矿床的证据，阿萨巴斯卡

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Hydrogen (H-2)-rich fluids are observed in a wide variety of geologic settings including gas seeps in serpentinized ultramafic rocks, sub-seafloor hydrothermal vents, fracture networks in crystalline rocks from continental and oceanic crust, and volcanic gases. Natural hydrogen sources can sustain deep microbial ecosystems, induce abiotic hydrocarbons synthesis and trigger the formation of prebiotic organic compounds. However, due to its extreme mobility and small size, hydrogen is not easily trapped in the crust. If not rapidly consumed by redox reactions mediated by bacteria or suitable mineral catalysts it diffuses through the rocks and migrates toward the surface. Therefore, H-2 is not supposed to accumulate in the crust. We challenge this view by demonstrating that significant amount of H-2 may be adsorbed by clay minerals and remain trapped beneath the surface. Here, we report for the first time H-2 content in clay-rich rocks, mainly composed of illite, chlorite, and kaolinite from the Cigar Lake uranium ore deposit (northern Saskatchewan, Canada). Thermal desorption measurements reveal that H-2 is enriched up to 500 ppm (i.e. 0.25 mol kg(-1) of rock) in these water-saturated rocks having a very low total organic content (0.5 wt%). Such hydrogen uptake is comparable and even exceeds adsorbed methane capacities reported elsewhere for pure clay minerals or shales. Sudoite (Al-Mg di-trioctahedral chlorite) is probably the main mineral responsible for H-2 adsorption in the present case. The presence of multiple binding sites in interlinked nanopores between crystal layers of illite-chlorite particles offers the ideal conditions for hydrogen sorption. We demonstrate that 4 to 17% of H-2 produced by water radiolysis over the 1.4-Ga-lifetime of the Cigar Lake uranium ore deposit has been trapped in the surrounding clay alteration haloes. As a result, sorption processes on layered silicates must not be overlooked as they may exert an important control on the fate
机译：在各种各样的地质环境中观察到氢气（H-2） - 液体，包括蛇形超岩石岩石，亚海地板水热通风口，陆地岩石中的骨灰网络中的气体渗流，来自欧式地壳的晶体岩石和火山气体。天然氢气来源可以维持深度微生物生态系统，诱导非生物烃的合成并引发益生元有机化合物的形成。然而，由于其极端的流动性和体积小，氢不容易被困在地壳中。如果没有被细菌或合适的矿物催化剂介导的氧化还原反应迅速消耗，它将通过岩石扩散并朝向表面迁移。因此，H-2不应该在地壳中积聚。我们通过证明大量的H-2可以通过粘土矿物吸附并捕获在表面下方，我们挑战这种观点。在这里，我们报告富含岩石的岩石中的第一次H-2含量，主要由来自雪茄湖铀矿床（加拿大北部萨斯喀彻温省）的伊利石，氯鱼和高岭石组成。热解吸测量表明，在具有非常低的总有机含量（<0.5wt％）的这些水饱和岩石中，H-2在这些水饱和岩石中富集至500ppm（即0.25mol kg（-1）岩）。这种氢吸收具有可比性，甚至超过纯粘土矿物或页岩的其他地方的吸附甲烷能力。 sudoite（Al-Mg二氯化萘氯化物）可能是在本案例中负责H-2吸附的主要矿物质。在亚氯酸盐颗粒的晶体层之间的相互连接纳米孔中存在多个结合位点，为氢吸附的理想条件提供了理想的条件。我们证明，在雪茄湖铀矿床1.4-GA-Lifeyime中，4至17％的H-2在雪茄湖铀矿床上被困在周围的粘土改变卤化中。因此，不得忽视分层硅酸盐上的吸附过程，因为它们可能对命运产生重要控制

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