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The Late Ordovician (Sandbian) Glasford structure: A marine-target impact crater with a possible connection to the Ordovician meteorite event

Journal Article · · Meteoritics and Planetary Science
DOI:https://doi.org/10.1111/maps.13401· OSTI ID:1767765
 [1];  [2];  [2];  [2];  [3];  [4];  [5];  [6]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States). Illinois State Geological Survey; Univ. of Illinois at Urbana-Champaign, IL (United States); OSTI
  2. Texas Tech Univ., Lubbock, TX (United States)
  3. Univ. of Illinois at Urbana-Champaign, IL (United States)
  4. Univ. of Illinois at Urbana-Champaign, IL (United States); State Univ. of New York (SUNY), Geneseo, NY (United States)
  5. Consulting Geologist, Southern Pines, NC (United States)
  6. Dept. of Earth and Environmental Sciences, Iowa City, IA (United States)
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The Glasford structure in Illinois (USA) was recognized as a buried impact crater in the early 1960s but has never been reassessed in light of recent advances in planetary science. In this work, we document shatter cones and previously unknown quartz microdeformation features that support an impact origin for the Glasford structure. We identify the 4 km wide structure as a complex buried impact crater and describe syn- and postimpact deposits from its annular trough. We have informally designated these deposits as the Kingston Mines unit (KM). The fossils and sedimentology of the KM indicate a marine depositional setting. The various intervals within the KM constitute a succession of breccia, carbonate, sandstone, and shale similar to marine sedimentary successions preserved in other craters. Graptolite specimens retrieved from the KM place the time of deposition at approximately 455 ± 2 Ma (Late Ordovician, Sandbian). This age determination suggests a possible link between the Glasford impact and the Ordovician meteorite shower, an increase in the rate of terrestrial meteorite impacts attributed to the breakup of the L-chondrite parent body in the main asteroid belt.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Geologic Storage of CO2 (GSCO2); Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012504; FC26-05NT42588
OSTI ID:
1767765
Journal Information:
Meteoritics and Planetary Science, Journal Name: Meteoritics and Planetary Science Journal Issue: 12 Vol. 54; ISSN 1086-9379
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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