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Titolo:
K-Ar, Ar-40-Ar-39 ages and magnetostratigraphy of Brunhes and Matuyama lava sequences from La Palma Island
Autore:
Guillou, H; Carracedo, JC; Duncan, RA;
Indirizzi:
CEA, CNRS, Lab Sci Climat & Environm, F-91198 Gif Sur Yvette, France CEA Gif Sur Yvette France F-91198 vironm, F-91198 Gif Sur Yvette, France CSIC, IPNA, Estac Volcanol Canarias, Tenerife, Canary Islands, Spain CSICTenerife Canary Islands Spain rias, Tenerife, Canary Islands, Spain Oregon State Univ, Coll Oceanog & Atmospher Sci, Corvallis, OR 97331 USA Oregon State Univ Corvallis OR USA 97331 her Sci, Corvallis, OR 97331 USA
Titolo Testata:
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
fascicolo: 3-4, volume: 106, anno: 2001,
pagine: 175 - 194
SICI:
0377-0273(200105)106:3-4<175:KAAAMO>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
CANARY-ISLANDS; ASTRONOMICAL CALIBRATION; OCEANIC-ISLAND; HOTSPOT VOLCANISM; GAS SYSTEMATICS; EXCESS AR-40; TIME-SCALE; AR-40/AR-39; PLEISTOCENE; POTASSIUM;
Keywords:
La Palma; Canarian Archipelago; K-Ar; Ar-40-Ar-39 geochronology; magnetic stratigraphy; astronomical polarity time scales;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Guillou, H CEA, CNRS, Lab Sci Climat & Environm, Bat 12, F-91198 Gif Sur Yvette, France CEA Bat 12 Gif Sur Yvette France F-91198 if Sur Yvette, France
Citazione:
H. Guillou et al., "K-Ar, Ar-40-Ar-39 ages and magnetostratigraphy of Brunhes and Matuyama lava sequences from La Palma Island", J VOLCANOL, 106(3-4), 2001, pp. 175-194

Abstract

We have applied geological mapping, magnetostratigraphy and unspiked K-Ar and Ar-40-Ar-39 datings to reconstruct the main volcanic stages of the northern part of La Palma, an oceanic volcanic island of the Canaries archipelago. Based on 57 new K-Ar and Ar-40-Ar-39 ages, mostly concordant with the astronomic polarity time scale, three main volcanic units are distinguished:the Garafia volcano, and the Lower and Upper Taburiente volcanoes. This entirely subaerial activity took place between 1722 +/- 25 and 440 +/- 8 ka. The oldest stage, corresponding to the Garafia volcano, encompasses the post-Olduvai-Cobb Mountain period, with isotopic age determinations ranging from 1722 +/- 25 to 1208 +/- 8 ka. The oldest lava Bows of the Taburiente volcano, which was active between 1.08 +/- 0.04 and 833 +/- 11 ka, recorded the Jaramillo normal polarity subchron and younger reversed flows were erupted during the upper part of the post-Jaramillo-Matuyama period. All the Upper Taburiente lava Bows were erupted during the Brunhes chron and have ages ranging from 770 +/- 11 to 430 +/- 8 ka. The age of the Garafia collapse lies between 1.20 +/- 0.05 and 1.08 +/- 0.04 Ma, while the Cumbre Nueva collapse occurred at about 550 ka. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/04/20 alle ore 02:32:01