40Ar-39Ar step-heating of impact glasses from the Nordlinger Ries impact crater-Implications on excess argon in impact melts and tektites

被引:23
|
作者
Schwarz, Winfried H. [1 ,2 ]
Lippolt, Hans J. [2 ]
机构
[1] Heidelberg Univ, Inst Geowissensch, D-69120 Heidelberg, Germany
[2] Heidelberg Univ, Lab Geochronol, D-69120 Heidelberg, Germany
关键词
CANYON SANIDINE STANDARD; K-40 DECAY CONSTANTS; SUEVITE REVISITED-OBSERVATIONS; JOINT DETERMINATION; IMPROVED ACCURACY; 40AR/39AR GEOCHRONOLOGY; DATING STANDARD; ET-AL; AGE; 40AR-ASTERISK/K-40;
D O I
10.1111/maps.12309
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Seven impact melts from various places in the Nordlinger Ries were dated by 40Ar-39Ar step-heating. The aim of these measurements was to increase the age data base for Ries impact glasses directly from the Ries crater, because there is only one Ar-Ar step-heating spectrum available in the literature. Almost all samples display saddle-shaped age spectra, indicating the presence of excess argon in most Ries glass samples, most probably inherited argon from incompletely degassed melt and possibly also excess argon incorporated during cooling from adjacent phases. In contrast, moldavites usually contain no inherited argon, probably due to their different formation process implying solidification during ballistic transport. The plateau age of the only flat spectrum is 14.60 +/- 0.16 (0.20) Ma (2 sigma), while the total age of this sample is 14.86 +/- 0.20 (0.22) Ma (isochron age: 14.72 +/- 0.18 [0.22] Ma [2 sigma]), proofing the chronological relationship of the Ries impact and moldavites. The total ages of the other samples range between 15.77 +/- 0.52 and 20.4 +/- 1.0 Ma (2 sigma), implying approximately 2-40% excess 40Ar (compared to the nominal age of the Ries crater) in respective samples. Thus, the age of 14.60 +/- 0.16 (0.20) (2 sigma) (14.75 +/- 0.16 [0.20 Ma] [2 sigma], calculated using the most recent suggestions for the K decay constants) can be considered as reliable and is within uncertainties indistinguishable from the most recent compilation for the age of the moldavite tektites.
引用
收藏
页码:1023 / 1036
页数:14
相关论文
共 50 条
  • [41] 40Ar/39Ar laser probe age determination confirms the Ries impact crater as the source of glass particles in Graupensand sediments (Grimmelfingen Formation, North Alpine Foreland Basin)
    Elmar Buchner
    Hartmut Seyfried
    Paul van den Bogaard
    International Journal of Earth Sciences , 2003, 92 : 1 - 6
  • [42] Three age ranges of Cenozoic basaltic rocks from Lower Silesia (SW Poland) based on 40Ar/39Ar step-heating data
    Magdalena Pańczyk
    Jerzy Nawrocki
    Paweł Aleksandrowski
    Bogusław Przybylski
    International Journal of Earth Sciences, 2023, 112 : 725 - 740
  • [43] 40Ar/39Ar laser probe age determination confirms the Ries impact crater as the source of glass particles in Graupensand sediments (Grimmelfingen Formation, North Alpine Foreland Basin)
    Buchner, E
    Seyfried, H
    van den Bogaard, P
    INTERNATIONAL JOURNAL OF EARTH SCIENCES, 2003, 92 (01) : 1 - 6
  • [44] Three age ranges of Cenozoic basaltic rocks from Lower Silesia (SW Poland) based on 40Ar/39Ar step-heating data
    Panczyk, Magdalena
    Nawrocki, Jerzy
    Aleksandrowski, Pawel
    Przybylski, Boguslaw
    INTERNATIONAL JOURNAL OF EARTH SCIENCES, 2023, 112 (02) : 725 - 740
  • [45] AR-40 AR-39 STEP-HEATING AND LASER FUSION DATING OF A QUATERNARY PUMICE FROM NESCHERS, MASSIF-CENTRAL, FRANCE - THE DEFEAT OF XENOCRYSTIC CONTAMINATION
    LOBELLO, P
    FERAUD, G
    HALL, CM
    YORK, D
    LAVINA, P
    BERNAT, M
    CHEMICAL GEOLOGY, 1987, 66 (1-2) : 61 - 71
  • [46] Major element data, 40Ar/39Ar step-heating and step-crushing data for anorthoclase megacrysts from the Newer Volcanic Province, south-eastern Australia
    Matchan, E. L.
    Phillips, D.
    Traine, E.
    Zhu, D.
    DATA IN BRIEF, 2018, 19 : 1847 - 1851
  • [47] A Rhaetian 40Ar/39Ar age for the Rochechouart impact structure (France) and implications for the latest Triassic sedimentary record
    Schmieder, Martin
    Buchner, Elmar
    Schwarz, Winfried H.
    Trieloff, Mario
    Lambert, Philippe
    METEORITICS & PLANETARY SCIENCE, 2010, 45 (08) : 1225 - 1242
  • [48] 40Ar/39Ar impact ages and time-temperature argon diffusion history of the Bunburra Rockhole anomalous basaltic achondrite
    Jourdan, Fred
    Benedix, Gretchen
    Eroglu, Ela
    Bland, Phil A.
    Bouvier, Audrey
    GEOCHIMICA ET COSMOCHIMICA ACTA, 2014, 140 : 391 - 409
  • [49] A Late Mesoproterozoic 40Ar/39Ar age for a melt breccia from the Keurusselka impact structure, Finland
    Schmieder, Martin
    Jourdan, Fred
    Moilanen, Jarmo
    Buchner, Elmar
    Ohman, Teemu
    METEORITICS & PLANETARY SCIENCE, 2016, 51 (02) : 303 - 322
  • [50] Zircons from the Acraman impact melt rock (South Australia): Shock metamorphism, U-Pb and 40Ar/39Ar systematics, and implications for the isotopic dating of impact events
    Schmieder, M.
    Tohver, E.
    Jourdan, F.
    Denyszyn, S. W.
    Haines, P. W.
    GEOCHIMICA ET COSMOCHIMICA ACTA, 2015, 161 : 71 - 100