Light Noble Gases in the Geological Mass Extinction Layers in Hungary

被引：0
|
作者：
Nishimura, Chikako [2 ]
Matsumoto, Takuya [2 ]
Matsuda, Jun-Ichi [2 ]
Detre, Csaba H. [3 ]
Don, Gyoergy [3 ]
Braun, Tibor [1 ]
机构：
[1] Eotvos Lorand Univ, Inst Inorgan & Analyt Chem, H-1443 Budapest, Hungary
[2] Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Osaka 5600043, Japan
[3] Geol Inst Hungary, H-1143 Budapest, Hungary
来源：
REVISTA DE CHIMIE | 2008年 / 59卷 / 11期
关键词：
sedimentary rock; Ar-38/Ar-36; ratios; radiogenic components; noble gases;
D O I：
暂无
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The elemental abundance and isotopic ratio of He and Ar have been measured in the sedimentary rock samples of Permian (P) - Triassic (T) and Triassic (T) - Jurassic (J) boundary layers in Hungary. Low 3He/He-4 and high Ar-40/Ar-36 ratios as compared to the air values have been found, suggesting that radiogenic components are predominant in these layers. The Ar-38/Ar-36 ratios are also atmospheric. Thus, it is likely that all these isotopic ratios of noble gases are not indicating an extraterrestrial impact. However, there seems to be pulse increases of He-3 concentration at the P- T boundary compared to other P and T samples. This still maintains the possibility that an extraterrestrial input is the cause for the mass extinction at the P- T boundary.
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收藏
页码：1180 / 1185
页数：6
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