A minimum U-Pb age for Siberian flood-basalt volcanism

被引：123

作者：

Kamo, SL ^{[1
]}

Czamanske, GK ^{[1
]}

Krogh, TE ^{[1
]}

机构：

[1] US GEOL SURVEY,MENLO PK,CA 94025

来源：

GEOCHIMICA ET COSMOCHIMICA ACTA | 1996年 / 60卷 / 18期

关键词：

D O I：

10.1016/0016-7037(96)00173-1

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：

Establishing an accurate and precise age for Siberian flood-basalt volcanism is of great importance in evaluating causes for the unequaled mass extinction of flora and fauna at the Permian-Triassic boundary. We report a new, minimum U-Pb age obtained from zircon and baddeleyite from the mineralized Noril'sk I intrusion that cuts the lower third of this rapidly deposited, 3500-m-thick volcanic sequence near Noril'sk. This 251.2 +/- 0.3 (2 sigma) Ma age is within analytical error of the SHRIMP U-Pb age for zircon from the Permian-Triassic boundary at Meishan, South China [251.1 +/- 3.6 Ma (2 sigma)], and confirms Siberian basaltic volcanism as a possible contributor to the mass extinction.

引用

页码：3505 / 3511

页数：7

共 55 条

[11] THE AGE OF THE PERMIAN TRIASSIC BOUNDARY [J].