^1,2AlSalhi M.S.,²Masilamani V.,³Alarifi N.,^1,2Aslam Farooq W.,^1,2Atif M.,¹Ramay S.,¹Saeed Althobaiti H.,⁴Anwar S.,³Elkhedr I.,³Abuamarah B.A.
Journal of King Saud University 33, 101341 Link to Article [DOI
10.1016/j.jksus.2021.101341]
¹Physics and Astronomy Department, College of Science, King Saud University, Riyadh, Saudi Arabia
²Research Chair for Laser Diagnosis of Cancer, King Saud University, Riyadh, Saudi Arabia
³Department of Geology and Geophysics, College of Science King Saud University, Riyadh, Saudi Arabia
⁴Industrial Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh, 11421, Saudi Arabia

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^1,2Wouters M.,¹Rahman S.,³Myamoto H.,^1,4Tran N.N.,^1,5Hessel V.
Separation and Purification Technology 260, 118238 Link to Article [DOI
10.1016/j.seppur.2020.118238]
¹School of Chemical Engineering and Advanced Materials, University of Adelaide, Australia
²Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Netherlands
³Department of Systems Innovation, The University of Tokyo, Japan
⁴Department of Chemical Engineering, Can Tho University, Viet Nam
⁵School of Engineering, University of Warwick, United Kingdom

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¹Kalpana M.S.,¹Babu E.V.S.S.K.,²Mani D.,³Tripathi R.P.,⁴Bhandari N.
Planetary and Space Science 198, 105177 Link to Article [DOI
10.1016/j.pss.2021.105177]
¹National Geophysical Research Institute (Council of Scientific and Industrial Research), Hyderabad, 500007, India
²Centre for Earth, Ocean and Atmospheric Sciences (CEOAS), University of Hyderabad, Gachibowli, Hyderabad, 500046, India
³78, BGKT Extension, Jodhpur, 342005, India
⁴Science and Spirituality Research Institute, Navrangpura, Ahmedabad, 380009, India

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¹Fredrik Terfelt,^1,2Birger Schmitz
Proceedings of the National Academy of Sciences of teh United States of America 118, e2020977118 Link to Article [https://doi.org/10.1073/pnas.2020977118]
¹Astrogeobiology Laboratory, Department of Physics, Lund University, 221 00 Lund, Sweden;
²Robert A. Pritzker Center for Meteoritics and Polar Studies, Negaunee Integrative Research Center, Field Museum of Natural History, Chicago, IL 60605

The meteoritic material falling on Earth is believed to derive from large break-up or cratering events in the asteroid belt. The flux of extraterrestrial material would then vary in accordance with the timing of such asteroid family-forming events. In order to validate this, we investigated marine sediments representing 15 time-windows in the Phanerozoic for content of micrometeoritic relict chrome-spinel grains (>32 μm). We compare these data with the timing of the 15 largest break-up events involving chrome-spinel–bearing asteroids (S- and V-types). Unexpectedly, our Phanerozoic time windows show a stable flux dominated by ordinary chondrites similar to today’s flux. Only in the mid-Ordovician, in connection with the break-up of the L-chondrite parent body, do we observe an anomalous micrometeorite regime with a two to three orders-of-magnitude increase in the flux of L-chondritic chrome-spinel grains to Earth. This corresponds to a one order-of-magnitude excess in the number of impact craters in the mid-Ordovician following the L-chondrite break-up, the only resolvable peak in Phanerozoic cratering rates indicative of an asteroid shower. We argue that meteorites and small (<1-km-sized) asteroids impacting Earth mainly sample a very small region of orbital space in the asteroid belt. This selectiveness has been remarkably stable over the past 500 Ma.