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Heck PR, Greer J, Boesenberg JS, Bouvier A, Caffee MW, Cassata WS, Corrigan C, Davis AM, Davis DW, Fries M, Hankey M, Jenniskens P, Schmitt‐Kopplin P, Sheu S, Trappitsch R, Velbel M, Weller B, Welten K, Yin Q, Sanborn ME, Ziegler K, Rowland D, Verosub KL, Zhou Q, Liu Y, Tang G, Li Q, Li X, Zajacz Z. The fall, recovery, classification, and initial characterization of the Hamburg, Michigan H4 chondrite. Meteorit Planet Sci 2020; 55:2341-2359. [PMID: 33510569 PMCID: PMC7820957 DOI: 10.1111/maps.13584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 07/30/2020] [Accepted: 09/23/2020] [Indexed: 06/12/2023]
Abstract
The Hamburg meteorite fell on January 16, 2018, near Hamburg, Michigan, after a fireball event widely observed in the U.S. Midwest and in Ontario, Canada. Several fragments fell onto frozen surfaces of lakes and, thanks to weather radar data, were recovered days after the fall. The studied rock fragments show no or little signs of terrestrial weathering. Here, we present the initial results from an international consortium study to describe the fall, characterize the meteorite, and probe the collision history of Hamburg. About 1 kg of recovered meteorites was initially reported. Petrology, mineral chemistry, trace element and organic chemistry, and O and Cr isotopic compositions are characteristic of H4 chondrites. Cosmic ray exposure ages based on cosmogenic 3He, 21Ne, and 38Ar are ~12 Ma, and roughly agree with each other. Noble gas data as well as the cosmogenic 10Be concentration point to a small 40-60 cm diameter meteoroid. An 40Ar-39Ar age of 4532 ± 24 Ma indicates no major impact event occurring later in its evolutionary history, consistent with data of other H4 chondrites. Microanalyses of phosphates with LA-ICPMS give an average Pb-Pb age of 4549 ± 36 Ma. This is in good agreement with the average SIMS Pb-Pb phosphate age of 4535.3 ± 9.5 Ma and U-Pb Concordia age of 4535 ± 10 Ma. The weighted average age of 4541.6 ± 9.5 Ma reflects the metamorphic phosphate crystallization age after parent body formation in the early solar system.
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Askerka M, Li Z, Lempen M, Liu Y, Johnston A, Saidaminov MI, Zajacz Z, Sargent EH. Learning-in-Templates Enables Accelerated Discovery and Synthesis of New Stable Double Perovskites. J Am Chem Soc 2019; 141:3682-3690. [DOI: 10.1021/jacs.8b13420] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Mikhail Askerka
- Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, ON, Canada M5S 3G4
| | - Ziliang Li
- Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, ON, Canada M5S 3G4
| | - Mathieu Lempen
- Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, ON, Canada M5S 3G4
| | - Yanan Liu
- Department of Earth Sciences, University of Toronto, 22 Russell Street, Toronto, ON, Canada M5S 3B1
| | - Andrew Johnston
- Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, ON, Canada M5S 3G4
| | - Makhsud I. Saidaminov
- Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, ON, Canada M5S 3G4
| | - Zoltan Zajacz
- Department of Earth Sciences, University of Toronto, 22 Russell Street, Toronto, ON, Canada M5S 3B1
| | - Edward H. Sargent
- Department of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, ON, Canada M5S 3G4
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