THE AGE OF THE PERMIAN TRIASSIC BOUNDARY

被引：105

作者：

CLAOUELONG, JC ^{[1
]}

ZHANG, ZC ^{[1
]}

MA, GG ^{[1
]}

DU, SH ^{[1
]}

机构：

[1] YICHANG INST GEOL & MINERAL RESOURCES,YICHANG 443003,PEOPLES R CHINA

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 1991年 / 105卷 / 1-3期

关键词：

D O I：

10.1016/0012-821X(91)90129-6

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：

The 5 cm boundary clay bed in the Chinese stratotype section through the Permian-Triassic boundary has been recognised as a bentonite. SHRIMP ion microprobe dating of zircons in the bentonite indicates a magmatic age of 251.2 +/- 3.4 Ma (2-sigma); this is the first direct constraint on the numerical age of the Permian-Triassic boundary. Future refinements of ages at this important, but poorly constrained, level of the Phanerozoic timescale may depend on re-analysis of this uniquely placed volcanic horizon, and other bentonites in the fossiliferous Chinese Upper Permian and Lower Triassic. The utility of defining the Permian-Triassic boundary in the Chinese stratotype section, in the vicinity of known dateable horizons, should be considered.

引用

页码：182 / 190

页数：9

共 21 条

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