Discovery of distal ejecta from the 1850 Ma Sudbury impact event

Addison, William D.; Brumpton, Gregory R.; Vallini, Daniela A.; McNaughton, Neal J.; Davis, Don W.; Kissin, S. A.; Fralick, Philip; Hammond, A. L.

doi:10.1130/g21048.1

Cited by 113 publications

(74 citation statements)

References 11 publications

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“…The identification of fayalite and confirmation of the occurrence of high-pressure polymorphs (ringwoodite, -Fe 2 SiO 4 ) unequivocally indicate that the El Gasco pumice rocks were subjected to high-pressure conditions, quite similar to those observed in shock-induced molten and recrystallised materials such as some meteorites and impact-related rocks (i.e. distal ejecta materials 34,35 ). Ringwoodite is an important mineral for the interpretation of the physical and chemical properties of the Earth's mantle and some of the shock processes in meteorites.…”

Section: Resultsmentioning

confidence: 89%

Micro‐Raman spectroscopic study of El Gasco pumice, western Spain

Rull

Martínez‐Frías

Rodríguez-Losada

2006

J Raman Spectroscopy

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A micro-Raman spectroscopic study of pumice materials from El Gasco (Sierra de Gata, Spain) has been performed for the first time. The obtained spectra allow the precise identification of the minerals, quartz, haematite, magnetite, ilmenite, rutile and anatase, in general agreement with results obtained by complementary techniques of X-Ray Diffraction (XRD) and Electron Microprobe. Also, fayalite and ferroan ringwoodite have been identified. The presence of high-pressure polymorphs indicates that the pumice rocks were subjected to high-pressure conditions quite similar to those observed in shock-induced molten and recrystallised materials, such as some meteorites and impact-related rocks.

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Section: Resultsmentioning

confidence: 89%

Micro‐Raman spectroscopic study of El Gasco pumice, western Spain

Rull

Martínez‐Frías

Rodríguez-Losada

2006

J Raman Spectroscopy

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“…The largest, Vredefort in South Africa, is dated at 2.02 Ga; the second-largest, Sudbury, has an age of 1.85 Ga (both impacts reviewed by Grieve & Therriault 2000). No ejecta blanket has been discovered from Vredefort, but three regions of ejecta localities within 500-800 km from Sudbury are now reported (Addison et al 2005;Pufahl et al 2007). An impact spherule-bearing locality on the Nain or North Atlantic craton (Chadwick et al 2001) has age constraints of 1.88 -1.85 Ga (Garde et al 2002), barely within range of the Sudbury event.…”

Section: Extra-terrestrial Influences: Bolides and Earth-moon Orbitalmentioning

confidence: 99%

Palaeoproterozoic supercontinents and global evolution: correlations from core to atmosphere

Reddy

Evans

2009

115

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The Palaeoproterozoic era was a time of profound change in Earth evolution and represented perhaps the first supercontinent cycle, from the amalgamation and dispersal of a possible Neoarchaean supercontinent to the formation of the 1.9-1.8 Ga supercontinent Nuna. This supercontinent cycle, although currently lacking in palaeogeographic detail, can in principle provide a contextual framework to investigate the relationships between deep-Earth and surface processes. In this article, we graphically summarize secular evolution from the Earth's core to its atmosphere, from the Neoarchaean to the Mesoproterozoic eras (specifically 3.0-1.2 Ga), to reveal intriguing temporal relationships across the various 'spheres' of the Earth system. At the broadest level our compilation confirms an important deep-Earth event at c. 2.7 Ga that is manifested in an abrupt increase in geodynamo palaeointensity, a peak in the global record of large igneous provinces, and a broad maximum in several mantle-depletion proxies. Temporal coincidence with juvenile continental crust production and orogenic gold, massive-sulphide and porphyry copper deposits, indicate enhanced mantle convection linked to a series of mantle plumes and/or slab avalanches. The subsequent stabilization of cratonic lithosphere, the possible development of Earth's first supercontinent and the emergence of the continents led to a changing surface environment in which voluminous banded iron-formations could accumulate on the continental margins and photosynthetic life could flourish. This in turn led to irreversible atmospheric oxidation at 2.4-2.3 Ga, extreme events in global carbon cycling, and the possible dissipation of a former methane greenhouse atmosphere that resulted in extensive Palaeoproterozoic ice ages. Following the great oxidation event, shallow marine sulphate levels rose, sediment-hosted and iron-oxide-rich metal deposits became abundant, and the transition to sulphide-stratified oceans provided the environment for early eukaryotic evolution. Recent advances in the geochronology of the global stratigraphic record have made these inferences possible. Frontiers for future research include more refined modelling of Earth's thermal and geodynamic evolution, palaeomagnetic studies of geodynamo intensity and continental motions, further geochronology and tectonic syntheses at regional levels, development of new isotopic systems to constrain geochemical cycles, and continued innovation in the search for records of early life in relation to changing palaeoenvironments.

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“…However, only few workers have so far attempted to enlarge the distal impact record through dedicated search for impact tracers. In this context, a positive development has been the identification of the ejecta from the Sudbury impact structure in distal sedimentary sections in western Ontario and Minnesota (Addison et al 2005), and in Michigan (Kring et al 2006;Pufahl et al 2007). The ejecta of the Vredefort event that have been searched for in the Waterberg Group strata of northern South Africa are, however, still elusive (Reimold 2007).…”

mentioning

confidence: 99%

The Impact Crater Bandwagon (Some problems with the terrestrial impact cratering record)

Reimold¹

2007

Meteorit & Planetary Scien

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Discovery of distal ejecta from the 1850 Ma Sudbury impact event

Cited by 113 publications

References 11 publications

Micro‐Raman spectroscopic study of El Gasco pumice, western Spain

Micro‐Raman spectroscopic study of El Gasco pumice, western Spain

Palaeoproterozoic supercontinents and global evolution: correlations from core to atmosphere

The Impact Crater Bandwagon (Some problems with the terrestrial impact cratering record)

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