40Ar–39Ar age of Siberian basaltic volcanism

Autor:	K. Gopalan, A.I. Al'Mukhamedov, T. R. Venkatesan, Anil Kumar
Rok vydání:	1997
Předmět:	Basalt geography Plateau geography.geographical_feature_category Earth science Geochemistry Geology Volcanism engineering.material Geochemistry and Petrology engineering Flood basalt Sequence stratigraphy Hornblende
Zdroj:	Chemical Geology. 138:303-310
ISSN:	0009-2541
DOI:	10.1016/s0009-2541(97)00006-5
Popis:	Five of six samples representing the entire stratigraphic sequence (∼3700 m thick) of basaltic flows in the Noril'sk section in the northwestern part of Siberian flood basalt province, Russia yield 40 Ar– 39 Ar plateau ages between 248.3±1.7 Ma and 246.9±2.5 Ma relative to an age of 520.4 Ma for the hornblende standard, MMhb-1. These results clarify some discrepancies in existing data and confirm that eruption of the bulk of Siberian basalts was close to 248 Ma and possibly lasted less than 2 Ma. Although the violence of this volcanism may have caused the massive extinctions at the Permo–Triassic boundary, the onset of changes across this boundary seems to have been distinctly earlier.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::57f38d298f54ab8595dfd8bf71e0838d https://doi.org/10.1016/s0009-2541(97)00006-5 Zobrazit plný text záznamu Full Text from ScienceDirect