| Abstract: | 40Ar/39Ar age spectra of biotite from a mineralized vein in the ore-bearing, Noril‘sk I intrusion and from picritic-like gabbrodolerite from the weakly mineralized, Lower Talnakh intrusion show that these bodies were emplaced at 249 ?? 2 Ma, which is not significantly different from the age of the Permian-Triassic boundary. The ore-bearing intrusions postdate the lower third of the flood-basalt sequence in the Noril‘sk area and, on the basis of geochemistry, can best be correlated with lavas slightly younger than those which they cut. Thus, flood basalt was erupted at the time of the Permian-Triassic mass extinction event, although its role in this event is, as yet, ill defined. Additional new 40Ar/39Ar age data for a group of intrusive and extrusive rocks on the western margin of the Siberian craton are discussed. -from Authors |
| Genre: | Article |
| ProdID: | 70019206 |
| Citation Author: | Dalrymple, G. B.; Czamanske, G. K.; Fedorenko, V. A.; Simonov, O. N.; Lanphere, M. A.; Likhachev, A. P. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 2083 |
| Citation Issue: | 10 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Geochimica et Cosmochimica Acta |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 13 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | A reconnaissance 40Ar/39Ar geochronologic study of ore-bearing and related rocks, Siberian Russia; 1995; Article; Journal; Geochimica et Cosmochimica Acta; Dalrymple, G. B.; Czamanske, G. K.; Fedorenko, V. A.; Simonov, O. N.; Lanphere, M. A.; Likhachev, A. P. |
| Citation Start Page: | 2071 |
| Citation Volume: | 59 |
| Citation Year: | 1995 |
| Type: | citation/reference |
| Text: | A reconnaissance 40Ar/39Ar geochronologic study of ore-bearing and related rocks, Siberian Russia; 1995; Article; Journal; Geochimica et Cosmochimica Acta; Dalrymple, G. B.; Czamanske, G. K.; Fedorenko, V. A.; Simonov, O. N.; Lanphere, M. A.; Likhachev, A. P. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1995 00:00 -0600 |
| Publisher: | |
