Publication Date:
2014-11-29
Description:
Meteorites exposed to high pressures and temperatures during impact-induced shock often contain minerals whose occurrence and stability normally confine them to the deeper portions of Earth's mantle. One exception has been MgSiO3 in the perovskite structure, which is the most abundant solid phase in Earth. Here we report the discovery of this important phase as a mineral in the Tenham L6 chondrite and approved by the International Mineralogical Association (specimen IMA 2014-017). MgSiO3-perovskite is now called bridgmanite. The associated phase assemblage constrains peak shock conditions to ~ 24 gigapascals and 2300 kelvin. The discovery concludes a half century of efforts to find, identify, and characterize a natural specimen of this important mineral.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tschauner, Oliver -- Ma, Chi -- Beckett, John R -- Prescher, Clemens -- Prakapenka, Vitali B -- Rossman, George R -- New York, N.Y. -- Science. 2014 Nov 28;346(6213):1100-2. doi: 10.1126/science.1259369.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geoscience and High Pressure Science and Engineering Center, University of Nevada, Las Vegas, NV 89134, USA. olivert@physics.unlv.edu. ; Division of Geology and Planetary Science, California Institute of Technology, Pasadena, CA 91125, USA. ; Center of Advanced Radiation Sources, University of Chicago, Chicago, IL 60632, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25430766" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
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Chemistry and Pharmacology
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Computer Science
,
Medicine
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Natural Sciences in General
,
Physics
