A precambrian proximal ejecta blanket from Scotland

Kenneth Amor, Stephen P. Hesselbo, Don Porcelli, Scott Neil Thackrey, John Parnell

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

Ejecta blankets around impact craters are rarely preserved on Earth. Although impact craters are ubiquitous on solid bodies throughout the solar system, on Earth they are rapidly effaced, and few records exist of the processes that occur during emplacement of ejecta. The Stac Fada Member of the Precambrian Stoer Group in Scotland has previously been described as volcanic in origin. However, shocked quartz and biotite provide evidence for high-pressure shock metamorphism, while chromium isotope values and elevated abundances of platinum group metals and siderophile elements indicate addition of meteoritic material. Thus, the unit is reinterpreted here as having an impact origin. The ejecta blanket reaches > 20 m in thickness and contains abundant dark green, vesicular, devitrified glass fragments. Field observations suggest that the deposit was emplaced as a single fluidized flow that formed as a result of an impact into water-saturated sedimentary strata. The continental geological setting and presence of groundwater make this deposit an analogue for Martian fluidized ejecta blankets.

Original languageEnglish
Pages (from-to)303-306
Number of pages4
JournalGeology
Volume36
Issue number4
DOIs
Publication statusPublished - Apr 2008

Keywords

  • ejecta
  • impactites
  • shock metamorphism
  • PGE
  • suevite
  • Torridonian
  • NW Scotland
  • accretionary lapilli
  • impact craters
  • Ries crater
  • Stoer group
  • geochemistry
  • Germany
  • origin
  • provenance
  • Chicxulub

Cite this

Amor, K., Hesselbo, S. P., Porcelli, D., Thackrey, S. N., & Parnell, J. (2008). A precambrian proximal ejecta blanket from Scotland. Geology, 36(4), 303-306. https://doi.org/10.1130/G24454A.1

A precambrian proximal ejecta blanket from Scotland. / Amor, Kenneth; Hesselbo, Stephen P.; Porcelli, Don; Thackrey, Scott Neil; Parnell, John.

In: Geology, Vol. 36, No. 4, 04.2008, p. 303-306.

Research output: Contribution to journalArticle

Amor, K, Hesselbo, SP, Porcelli, D, Thackrey, SN & Parnell, J 2008, 'A precambrian proximal ejecta blanket from Scotland', Geology, vol. 36, no. 4, pp. 303-306. https://doi.org/10.1130/G24454A.1
Amor K, Hesselbo SP, Porcelli D, Thackrey SN, Parnell J. A precambrian proximal ejecta blanket from Scotland. Geology. 2008 Apr;36(4):303-306. https://doi.org/10.1130/G24454A.1
Amor, Kenneth ; Hesselbo, Stephen P. ; Porcelli, Don ; Thackrey, Scott Neil ; Parnell, John. / A precambrian proximal ejecta blanket from Scotland. In: Geology. 2008 ; Vol. 36, No. 4. pp. 303-306.
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AB - Ejecta blankets around impact craters are rarely preserved on Earth. Although impact craters are ubiquitous on solid bodies throughout the solar system, on Earth they are rapidly effaced, and few records exist of the processes that occur during emplacement of ejecta. The Stac Fada Member of the Precambrian Stoer Group in Scotland has previously been described as volcanic in origin. However, shocked quartz and biotite provide evidence for high-pressure shock metamorphism, while chromium isotope values and elevated abundances of platinum group metals and siderophile elements indicate addition of meteoritic material. Thus, the unit is reinterpreted here as having an impact origin. The ejecta blanket reaches > 20 m in thickness and contains abundant dark green, vesicular, devitrified glass fragments. Field observations suggest that the deposit was emplaced as a single fluidized flow that formed as a result of an impact into water-saturated sedimentary strata. The continental geological setting and presence of groundwater make this deposit an analogue for Martian fluidized ejecta blankets.

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KW - shock metamorphism

KW - PGE

KW - suevite

KW - Torridonian

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KW - impact craters

KW - Ries crater

KW - Stoer group

KW - geochemistry

KW - Germany

KW - origin

KW - provenance

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