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Discovery of davemaoite, CaSiO₃-perovskite, as a mineral from the lower mantle

Tschauner, Oliver and Huang, Shichun and Yang, Shuying and Humayun, Munir and Liu, Wenjun and Gilbert Corder, Stephanie N. and Bechtel, Hans A. and Tischler, Jon and Rossman, George R. (2021) Discovery of davemaoite, CaSiO₃-perovskite, as a mineral from the lower mantle. Science, 374 (6569). pp. 891-894. ISSN 0036-8075. doi:10.1126/science.abl8568.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Tschauner, Oliver0000-0003-3364-8906
Huang, Shichun0000-0001-7660-8766
Yang, Shuying0000-0001-6950-9700
Humayun, Munir0000-0001-8516-9435
Gilbert Corder, Stephanie N.0000-0002-5041-8670
Bechtel, Hans A.0000-0002-7606-9333
Tischler, Jon0000-0001-6163-7505
Rossman, George R.0000-0002-4571-6884
Alternate Title:Discovery of davemaoite, CaSiO3-perovskite, as a mineral from the lower mantle
Additional Information:© 2021 American Association for the Advancement of Science. Received 9 August 2021; accepted 21 September 2021. We thank N. Tomioka and an anonymous reviewer for their helpful comments. Funding: This work was supported by awards NSF-EAR-1838330, -EAR-1942042, and -EAR-1322082; the NSF Cooperative Agreement No. DMR-1644779; and the State of Florida. Use of the Advanced Photon Source and the Advanced Light Source were supported by the US Department of Energy, Basic Energy Sciences, contracts DE-AC02-06CH11357 and DE-AC02-05CH11231, respectively. Author contributions: O.T., S.H., S.Y., and M.H. participated in design, interpretation, data collection, and analysis of the reported results and in drafting and revising the manuscript. W.L., S.N.G.C., H.A.B., J.T., and G.R.R. participated in data collection and revising the manuscript. Competing interests: The authors have no competing interests. Data and materials availability: Additional chemical and crystallographic information about davemaoite is provided in the supplementary materials. Raw data are deposited at Dryad (23). Crystallographic and chemical information on type davemaoite is deposited in the Inorganic Crystal Structure Database. The type material is deposited with the NHMLA under accession number 74541.
Funding AgencyGrant Number
State of FloridaUNSPECIFIED
Department of Energy (DOE)DE-AC02-06CH11357
Department of Energy (DOE)DE-AC02-05CH11231
Issue or Number:6569
Record Number:CaltechAUTHORS:20211111-221313042
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Official Citation:Discovery of davemaoite, CaSiO₃-perovskite, as a mineral from the lower mantle. Oliver Tschauner, Shichun Huang, Shuying Yang, Munir Humayun, Wenjun Liu, Stephanie N Gilbert Corder, Hans A. Bechtel, Jon Tischler, George R. Rossman. Science, 374 (6569); DOI: 10.1126/science.abl8568
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:111849
Deposited By: Tony Diaz
Deposited On:11 Nov 2021 22:28
Last Modified:11 Nov 2021 22:28

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