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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 >Carbonate stability in the reduced lower mantle
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Carbonate stability in the reduced lower mantle

机译：碳酸酯稳定性在降低的下部地幔中

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摘要

Carbonate minerals are important hosts of carbon in the crust and mantle with a key role in the transport and storage of carbon in Earth's deep interior over the history of the planet. Whether subducted carbonates efficiently melt and break down due to interactions with reduced phases or are preserved to great depths and ultimately reach the core-mantle boundary remains controversial. In this study, experiments in the laser-heated diamond anvil cell (LHDAC) on layered samples of dolomite (Mg, Ca)CO3 and iron at pressure and temperature conditions reaching those of the deep lower mantle show that carbon-iron redox interactions destabilize the MgCO3 component, producing a mixture of diamond, Fe7C3, and (Mg, Fe)O. However, CaCO3 is preserved, supporting its relative stability in carbonate-rich lithologies under reducing lower mantle conditions. These results constrain the thermodynamic stability of redox-driven breakdown of carbonates and demonstrate progress towards multiphase mantle petrology In the LHDAC at conditions of the lowermost mantle. (C) 2018 Elsevier B.V. All rights reserved.
机译：碳酸盐矿物在地壳和地幔的运输地球内部深处在这个星球上的历史上具有重要和储存碳的碳的重要宿主。无论俯冲碳酸盐有效地融化，分解由于与减少的阶段相互作用或将被保留，以巨大的深度，最终到达核幔边界仍存在争议。在这项研究中，在对白云石的层状样品（镁，钙）CO3和铁在压力和温度条件实现这些的深下地幔显示激光加热金刚石砧细胞（LHDAC）实验的碳 - 铁氧化还原相互作用破坏该碳酸镁组分，生产的金刚石，Fe7C3，和（镁，铁）O的混合物。然而，碳酸钙被保留，在还原下地幔条件支承在富含碳酸盐的岩性的相对稳定性。这些结果约束碳酸酯的氧化还原驱动击穿的热力学稳定性，并证明对多相地幔岩石在LHDAC在最下面的地幔条件进展。 （c）2018年elestvier b.v.保留所有权利。

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