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pro vyhledávání: '"Thomas E. Krogh"'
Publikováno v:
Geochimica et Cosmochimica Acta. 60:3505-3511
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 UPb age obtain
Autor:
Thomas E. Krogh
Publikováno v:
Geochimica et Cosmochimica Acta. 46:631-635
A loop of soft iron wire or a paper clip or a ferromagnetic grid mounted between the poles of an electromagnet picks up and allows further magnetic separation of zircons previously found to be non-magnetic on a Frantz Isodynamic Separator. Tests on p
Autor:
Thomas E. Krogh
Publikováno v:
Geochimica et Cosmochimica Acta. 46:637-649
Abrasion combined with an improved paramagnetic separation technique eliminates 90 to 100 percent of discordance so that ages of unprecedented accuracy (±1 to 3 m.y.) can be achieved for virtually all 2700 m.y. old zircon populations from plutonic o