A Carnian 40Ar/39Ar age for the Paasselkä impact structure (SE Finland)-An update

W.H. Schwarz; Martin Schmieder; E. Buchner; M. Trieloff; J. Moilanen; T. Öhman

doi:10.1111/maps.12407

A Carnian 40Ar/39Ar age for the Paasselkä impact structure (SE Finland)-An update

W.H. Schwarz, Martin Schmieder, E. Buchner, M. Trieloff, J. Moilanen, T. Öhman

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Abstract

© The Meteoritical Society, 2014. A recrystallized band of pale feldspathic impact melt in a gneissic impact breccia from the approximately 10 km Paasselkä impact structure in southeast Finland was dated via 40Ar/39Ar step-heating. The newly obtained plateau age of 228.7 ± 1.8 (2.2) Ma (2σ) (MSWD = 0.32; p = 0.93) is equal to the previously published pseudoplateau age of 228.7 ± 3.0 (3.4) (2σ) for the impact event. According to the current international chronostratigraphic chart and using the most recent published suggestions for the K decay constants, a Carnian (Late Triassic) age for the Paasselkä impact structure of 231.0 ± 1.8 (2.2) Ma (2σ) is calculated and considered the most precise and accurate age for this impact structure. The new plateau age for Paasselkä confirms the previous dating result but is, based on its internal statistics, much more compelling.

Original language	English
Pages (from-to)	135-140
Journal	Meteoritics and Planetary Science
Volume	50
Issue number	1
DOIs	https://doi.org/10.1111/maps.12407
Publication status	Published - 2015

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title = "A Carnian 40Ar/39Ar age for the Paasselk{\"a} impact structure (SE Finland)-An update",

abstract = "{\textcopyright} The Meteoritical Society, 2014. A recrystallized band of pale feldspathic impact melt in a gneissic impact breccia from the approximately 10 km Paasselk{\"a} impact structure in southeast Finland was dated via 40Ar/39Ar step-heating. The newly obtained plateau age of 228.7 ± 1.8 (2.2) Ma (2σ) (MSWD = 0.32; p = 0.93) is equal to the previously published pseudoplateau age of 228.7 ± 3.0 (3.4) (2σ) for the impact event. According to the current international chronostratigraphic chart and using the most recent published suggestions for the K decay constants, a Carnian (Late Triassic) age for the Paasselk{\"a} impact structure of 231.0 ± 1.8 (2.2) Ma (2σ) is calculated and considered the most precise and accurate age for this impact structure. The new plateau age for Paasselk{\"a} confirms the previous dating result but is, based on its internal statistics, much more compelling.",

author = "W.H. Schwarz and Martin Schmieder and E. Buchner and M. Trieloff and J. Moilanen and T. {\"O}hman",

year = "2015",

doi = "10.1111/maps.12407",

language = "English",

volume = "50",

pages = "135--140",

journal = "Meteoritics and Planetary Science",

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publisher = "John Wiley & Sons",

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TY - JOUR

T1 - A Carnian 40Ar/39Ar age for the Paasselkä impact structure (SE Finland)-An update

AU - Schwarz, W.H.

AU - Schmieder, Martin

AU - Buchner, E.

AU - Trieloff, M.

AU - Moilanen, J.

AU - Öhman, T.

PY - 2015

Y1 - 2015

N2 - © The Meteoritical Society, 2014. A recrystallized band of pale feldspathic impact melt in a gneissic impact breccia from the approximately 10 km Paasselkä impact structure in southeast Finland was dated via 40Ar/39Ar step-heating. The newly obtained plateau age of 228.7 ± 1.8 (2.2) Ma (2σ) (MSWD = 0.32; p = 0.93) is equal to the previously published pseudoplateau age of 228.7 ± 3.0 (3.4) (2σ) for the impact event. According to the current international chronostratigraphic chart and using the most recent published suggestions for the K decay constants, a Carnian (Late Triassic) age for the Paasselkä impact structure of 231.0 ± 1.8 (2.2) Ma (2σ) is calculated and considered the most precise and accurate age for this impact structure. The new plateau age for Paasselkä confirms the previous dating result but is, based on its internal statistics, much more compelling.

AB - © The Meteoritical Society, 2014. A recrystallized band of pale feldspathic impact melt in a gneissic impact breccia from the approximately 10 km Paasselkä impact structure in southeast Finland was dated via 40Ar/39Ar step-heating. The newly obtained plateau age of 228.7 ± 1.8 (2.2) Ma (2σ) (MSWD = 0.32; p = 0.93) is equal to the previously published pseudoplateau age of 228.7 ± 3.0 (3.4) (2σ) for the impact event. According to the current international chronostratigraphic chart and using the most recent published suggestions for the K decay constants, a Carnian (Late Triassic) age for the Paasselkä impact structure of 231.0 ± 1.8 (2.2) Ma (2σ) is calculated and considered the most precise and accurate age for this impact structure. The new plateau age for Paasselkä confirms the previous dating result but is, based on its internal statistics, much more compelling.

U2 - 10.1111/maps.12407

DO - 10.1111/maps.12407

M3 - Article

SN - 1086-9379

VL - 50

SP - 135

EP - 140

JO - Meteoritics and Planetary Science

JF - Meteoritics and Planetary Science

IS - 1

ER -

A Carnian 40Ar/39Ar age for the Paasselkä impact structure (SE Finland)-An update

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