lower mantle条件下的PDKEEPAAA不稳定性
FeOOH instability at the lower mantle conditions
摘要：
针铁矿，α-FeOOH，是被称为铁锈的氧化铁物种中的主要成分，其形成为从约38亿年（Gy）前直到约2.5 Gy前的大氧化事件（GOE）居住在地球上的无氧原核生物（1，2）的代谢产物。铁锈被埋在底土（1，2），并由于大约2.8 Gy前开始的板块构造（3）而不得不通过俯冲板块进入地幔。铁锈在下地幔高温高压（HPHT）条件下的命运和地质作用尚不清楚。利用同步辐射单晶x射线衍射研究了针铁矿在82（2）GPa和2300（100）K下的行为。在这些条件下，对应于深度约1000 km的最冷板片，α-FeOOH分解为各种铁氧化物（Fe 2 O3，Fe 5 O 7，Fe 7 O 10，Fe6.32O9）和富氧流体。我们的研究结果表明，地幔中铁锈的再循环可能有助于氧气释放到大气中，并解释了与大火成岩省形成有关的GOE之前氧气水平的零星增加（4）。
英文摘要：
Goethite, α-FeOOH, is a major component among oxidized iron species, called rust, which formed as a product of metabolism of anoxygenic prokaryotes (1, 2) inhabiting the Earth from about 3.8 billion years (Gy) ago until the Great Oxidation Event (GOE) of about 2.5 Gy ago. The rust was buried on the ocean floor (1, 2) and had to submerge into the Earth mantle with subducting slabs due to the plate tectonics started about 2.8 Gy ago (3). The fate and the geological role of the rust at the lower mantle high-pressure and high-temperature(HPHT) conditions is unknown. We studied the behavior of goethite up to 82(2) GPa and 2300(100) K using in situ synchrotron single-crystal X-ray diffraction. At these conditions, corresponding to the coldest slabs at the depth of about 1000 km, α-FeOOH decomposes to various iron oxides (Fe2O3, Fe5O7, Fe7O10, Fe6.32O9) and an oxygen-rich fluid. Our results suggest that recycling of the rust in the Earth mantle could contribute to oxygen release to the atmosphere and explain the sporadic increase of the oxygen level before the GOE linked to the formation of Large Igneous Provinces(4).
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