U-Pb zircon ages from the southwestern Karoo Basin, South Africa-Implications for the Permian-Triassic boundary

被引：87

作者：

Fildani, Andrea ^{[1
]}

Weislogel, Amy ^{[2
]}

Drinkwater, Nicholas J. ^{[3
]}

McHargue, Tim ^{[1
]}

Tankard, Anthony

Wooden, Joe ^{[4
]}

Hodgson, David ^{[5
]}

Flint, Stephen ^{[5
]}

机构：

[1] Chevron Energy Technol Co, San Ramon, CA 94583 USA

[2] Univ Alabama, Dept Geol Sci, Tuscaloosa, AL 35487 USA

[3] Chevron So African Business Unit, Houston, TX 77002 USA

[4] Stanford Univ, Stanford US Geol Survey Microanal Ctr, Stanford, CA 94305 USA

[5] Univ Liverpool, Dept Earth & Ocean Sci, STRAT Grp, Liverpool L69 3GP, Merseyside, England

来源：

GEOLOGY | 2009年 / 37卷 / 08期

关键词：

EVENT BED; EVOLUTION; GEOCHRONOLOGY; TANQUA; EXTINCTION; SYSTEMS;

D O I：

10.1130/G25685A.1

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

U-Pb ages determined using sensitive high-resolution ion microprobe-reverse geometry on 205 single-grain zircons from 16 ash beds within submarine fan deposits of the Ecca Group provide the first evidence of a marine Permian-Triassic (P-T) boundary in the Karoo Basin of South Africa. These U-Pb ages provide an objective basis for correlating the deep-marine sediments of the southwest Karoo Basin with fluvial-deltaic deposits in the central and eastern parts of the basin where the P-T boundary is recorded in a diverse macrofauna. Furthermore, these new zircon ages and their correlation imply asymmetric subsidence and variable sedimentation rates across the basin.

引用

页码：719 / 722

页数：4

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