Discovery of davemaoite, CaSiO 3 -perovskite, as a mineral from the lower mantle
Discovery of davemaoite, CaSiO 3 -perovskite, as a mineral from the lower mantle
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发现了来自下地幔的 davemaoite（CaSiO 3 -钙钛矿）
DOI：
10.1126/science.abl8568
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发表时间：
2021
期刊：
影响因子：
56.9
通讯作者：
Rossman, George R.
中科院分区：
文献类型：
--
作者：
Tschauner, Oliver;Huang, Shichun;Yang, Shuying;Humayun, Munir;Liu, Wenjun;Gilbert Corder, Stephanie N;Bechtel, Hans A.;Tischler, Jon;Rossman, George R.
硅酸钙钙钛矿，CaSiO 3，可以说是下地幔中最重要的地球化学相，因为它集中了上地幔中不相容的元素，包括发热元素钍和铀，它们的半衰期比地球的地质历史更长。我们报告CaSiO 3-钙钛矿作为批准的矿物（IMA 2020 - 012 a），名称为davemaoite。天然达氏岩标本证明了下地幔成分不均匀性的存在。我们的观察表明，davemaoite也主机钾除了铀和钍在其结构。因此，davemaoite的区域和全球丰度影响深部地幔的热收支，在那里矿物是热稳定的。
Calcium silicate perovskite, CaSiO3, is arguably the most geochemically important phase in the lower mantle, because it concentrates elements that are incompatible in the upper mantle, including the heat-generating elements thorium and uranium, which have half-lives longer than the geologic history of Earth. We report CaSiO3-perovskite as an approved mineral (IMA2020-012a) with the name davemaoite. The natural specimen of davemaoite proves the existence of compositional heterogeneity within the lower mantle. Our observations indicate that davemaoite also hosts potassium in addition to uranium and thorium in its structure. Hence, the regional and global abundances of davemaoite influence the heat budget of the deep mantle, where the mineral is thermodynamically stable.