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Constraining chronology and time-space evolution of Holocene volcanic activity on the Capelo Peninsula (Faial Island, Azores); the paleomagnetic contribution

Anita Di Chiara, Fabio Speranza, Massimiliano Porreca, Adriano Pimentel, Francesca D'Ajello Caracciolo and Jose Pacheco
Constraining chronology and time-space evolution of Holocene volcanic activity on the Capelo Peninsula (Faial Island, Azores); the paleomagnetic contribution
Geological Society of America Bulletin (April 2014) 126 (9-10): 1164-1180

Abstract

Faial is one of the most volcanically active islands of the Azores Archipelago. Historical eruptions occurred on the Capelo Peninsula (westernmost sector of the island) during A.D. 1672-1673 and more recently in A.D. 1957-1958. The other exposed volcanic products of the peninsula are so far loosely dated within the Holocene. Here, we present a successful attempt to correlate scoria cones and lava flows yielded by the same eruption on the Capelo Peninsula using paleomagnetic data from 31 sites (10 basaltic scoriae, 21 basaltic lava flows). In the investigated products, we recognize at least six prehistoric clusters of volcanic activity, whereas 11 lava sites are correlated with four scoria cones. Dating was conducted by comparing our paleomagnetic directions with relocated Holocene reference curves of the paleosecular variation of the geomagnetic field from France and the UK. We find that the studied volcanic rocks exposed on the Capelo Peninsula are younger than previously believed, being entirely formed in the last 8 k.y., and that the activity intensified over the last 3 k.y. Our study confirms that paleomagnetism is a powerful tool for unraveling the chronology and characteristics of Holocene activity at volcanoes where geochronological age constraints are still lacking.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 126
Serial Issue: 9-10
Title: Constraining chronology and time-space evolution of Holocene volcanic activity on the Capelo Peninsula (Faial Island, Azores); the paleomagnetic contribution
Affiliation: Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
Pages: 1164-1180
Published: 20140418
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 109
Accession Number: 2014-033404
Categories: Quaternary geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2014182
Illustration Description: illus. incl. 3 tables, geol. sketch map
N38°32'60" - N38°37'00", W28°49'60" - W28°43'60"
Secondary Affiliation: Universidade dos Acores, PRT, Portugal
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201421
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