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Journal Article
Journal: Geology
Published: 20 December 2017
Geology (2017) 46 (3): 203-206.
... of the source crater. 13 09 2017 22 11 2017 27 11 2017 © 2017 Geological Society of America 2017 Tektites are glassy impact ejecta that are important for understanding impact processes, as they occur over widely dispersed “strewn fields”, and can preserve geochemical information...
FIGURES
Journal Article
Journal: Geology
Published: 12 December 2017
Geology (2017) 46 (2): 171-174.
.... However, it is highly unusual to find unmelted crystals from the actual impactor within an ejecta layer. Here we detail the first recorded occurrence of vanadium-rich osbornite (TiVN) on Earth, from two sites on Skye, northwest Scotland, which are interpreted as part of a meteoritic ejecta layer. TiVN has...
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Series: GSA Special Papers
Published: 01 January 2014
DOI: 10.1130/2014.2503(03)
Series: GCSSEPM
Published: 01 December 2012
DOI: 10.5724/gcs.12.32.0096
EISBN: 978-0-9836097-8-0
... and influenced the sedimentation patterns of the subsequent sediment gravity flows of the Wilcox Formation. The Chicxulub impact is estimated to have caused a magnitude 11 earthquake tsunamis 100-300 m in height, and spread ejecta material around the globe ( Schulte et al. , 2010 ). Three...
Series: GSA Special Papers
Published: 01 December 2011
DOI: 10.1130/2011.2483(19)
... structural and lithological features: overturned crystalline rim flap; slumped interior megablock terrain; central polymict breccia (originating as near-field ejecta); interior marine chalk deposits and reworked glauconitic sands (formed by resurge and postimpact deposition); and a collapsed southern part...
Series: GSA Field Guide
Published: 01 January 2011
DOI: 10.1130/2011.0024(08)
EISBN: 9780813756240
... This field trip examines a sequence of ejecta and deformed substrate resulting from the 1850 Ma (Krogh, et al., 1984; Davis, 2008 ) Sudbury meteorite impact. Of the 178 known and scientifically verified terrestrial impacts, the Sudbury event was the second largest (based on crater...
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Series: GSA Special Papers
Published: 01 September 2010
DOI: 10.1130/2010.2465(10)
... from the upper sediment parts of the target could be recorded. Macroscopically and microscopically, melt fragments have mostly irregular shapes, which lead to the tentative conclusion that only part of the melt—and by implication suevite—mass is derived from fallout of the ejecta curtain. On the other...
Series: GSA Special Papers
Published: 01 September 2010
DOI: 10.1130/2010.2465(15)
... The Tookoonooka impact structure is a subsurface structure of the Eromanga Basin in Australia. Impact ejecta have recently been discovered in the stratigraphy proximal to the structure. The ejecta includes accretionary and armored impacto-clasts. They are observed at multiple locations in drill...
Series: GSA Special Papers
Published: 01 September 2010
DOI: 10.1130/2010.2465(17)
... The Campanian Manson impact structure of Iowa represents the best-preserved, large-diameter complex crater within the continental United States. The related bolide struck from the southeast at a low angle, potentially distributing ejecta downrange to the northwest across the Western Interior...
Series: GSA Special Papers
Published: 01 September 2010
DOI: 10.1130/2010.2465(21)
... that the within-crater suevites and polymict lithic breccias were emplaced either via slumping off the crater walls or lateral movement of some melted and much displaced target rock within the crater. Limited admixture of fallback material from the ejecta plume is evident in the uppermost impactite deposit...
Series: GSA Special Papers
Published: 01 September 2010
DOI: 10.1130/2010.2465(24)
.... Black cataclasite veins, although mineralogically identical to their host gneisses, are almost invariably more potassic than the latter. The ejecta apron outside the crater was deposited on the earliest, fossil-bearing, eolian sands of the Pliocene to Holocene Sossus Sand Formation. Subsequent...
Series: GSA Special Papers
Published: 01 April 2009
DOI: 10.1130/2009.2452(02)
... in the climate at that time are documented, and connection with the impact events is likely. This contribution provides a short review of late Eocene impact craters and ejecta layers. ...
Series: GSA Special Papers
Published: 01 April 2009
DOI: 10.1130/2009.2452(05)
Series: GSA Special Papers
Published: 01 April 2009
DOI: 10.1130/2009.2452(06)
... We evaluated the age of two Upper Eocene impact ejecta layers (North American microtektites linked to the Chesapeake Bay impact structure and clinopyroxene [cpx] spherules from the Popigai crater) and the global effects of the associated impact events. The reported occurrence of cpx spherules...
Series: GSA Special Papers
Published: 01 January 2009
DOI: 10.1130/2009.2458(16)
... of the transient cavity into the annular moat ~1.5 min after impact. This blocky debris was mixed with the remains of the excavation flow, which contained a pod of melt entrained in ground-surge debris on top. Subsequently, melt-rich suevites were emplaced that record interaction of the expanding ejecta plume...
Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2008.2437(07)
... are diagenetically altered microimpactors originally embedded while the grains were in the hypervelocity ejecta curtain. Carbonate accretionary lapilli and lapillistone beds associated with the Alamo Breccia in several localities within the Ring Realm were first documented by Kuehner (1997) and Warme...
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Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2008.2437(08)
.... Palynology of the ejecta matrix provides a middle to late Turonian date for the Avak impact event. The Avak structure (71°15.1′N, 156°27.3′W) is the northernmost of 11 Cretaceous-age impacts documented to occur within or immediately peripheral to a Cretaceous-age seaway in western North America (Fig...
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Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2008.2437(12)
... to the arch ( Figs. 1 and 4 ). The effects of pedogenesis on the preservation potential of impact ejecta (both geochemical and mineralogical phases) are unknown; however, any degree of pedogenesis should have an effect on ejecta preservation. Previous research on paleopedology related to ejecta includes...
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Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2008.2437(06)
... and Wünnemann, 2005 ; Horton et al., 2005d ), are as follows: (1) The projectile was largely vaporized on contact and produced a shock wave in the target. (2) Expansion of the shock wave excavated a complex transient crater in the target and produced shock metamorphism, melt, ejecta, and an ejecta curtain...
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Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2405(04)
... Intercontinental correlation of distal Archean impact ejecta layers can be used to help create a global time-stratigraphic framework for early Earth events. For example, an impact spherule layer in the Neoarchean Monteville Formation (Griqualand West Basin, South Africa) may be correlated...