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Titolo:
EMPLACEMENT OF HEBRIDEAN TERTIARY FLOOD BASALTS - EVIDENCE FROM AN INFLATED PAHOEHOE LAVA FLOW ON MULL, SCOTLAND
Autore:
KENT RW; THOMSON BA; SKELHORN RR; KERR AC; NORRY MJ; WALSH JN;
Indirizzi:
UNIV LEICESTER,DEPT GEOL,UNIV RD LEICESTER LE1 7RH LEICS ENGLAND UNIV LONDON KINGS COLL,DEPT GEOL LONDON WC2R 2LS ENGLAND UNIV LONDON,ROYAL HOLLOWAY COLL,DEPT GEOL EGHAM TW20 0EX SURREY ENGLAND
Titolo Testata:
Journal of the Geological Society
, volume: 155, anno: 1998,
parte:, 4
pagine: 599 - 607
SICI:
0016-7649(1998)155:<599:EOHTFB>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
NW SCOTLAND; KILAUEA VOLCANO; INNER HEBRIDES; HAWAII; SUCCESSION; STRATIGRAPHY; ERUPTIONS; MAGMAS; FIELD; SKYE;
Keywords:
MULL ISLAND; BASALTS; PAHOEHOE; EMPLACEMENT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
41
Recensione:
Indirizzi per estratti:
Citazione:
R.W. Kent et al., "EMPLACEMENT OF HEBRIDEAN TERTIARY FLOOD BASALTS - EVIDENCE FROM AN INFLATED PAHOEHOE LAVA FLOW ON MULL, SCOTLAND", Journal of the Geological Society, 155, 1998, pp. 599-607

Abstract

The lower 200 m of the Tertiary lava pile on Mull, western Scotland, consists mainly of small volume (0.01-1 km(3)), high-magnesian basaltic lava flows. Eruption of these flows probably occurred from fissures or point-source vents, producing pahoehoe-textured sheets averaging about 5m in thickness. Certain lavas cropping out in northwest Mull greatly exceed this average thickness and may represent inflated pahoehoe flows akin to those described at Kilauea, Hawai'i. Structural Featuresof a 16-30 m thick lava ar Port Haunn, northwest Mull, that conform to this proposal include sub-horizontal sheets of amygdales up to 14 cmthick separated by amygdale-poor zones, pipe amygdales at the base ofthe flow and a low-relief flow top. Alternating olivine-rich and olivine-poor bands in the Port Haunn lava are suggestive of lava pulses during a continuous eruption, also consistent with inflation. Elsewhere in western Mull, there is evidence for filled lava tubes and pahoehoe toes, both of which are characteristic of inflated sheet flows formed on gentle ground slopes (<4 degrees and perhaps <0.5 degrees). Fluid dynamical considerations suggest that each sheet flow in the lower partof the Mull lava sequence probably was active for a short period, permitting the build up of small lava fields over several months or years. This is commensurate with the small volume and limited areal extent of the Tertiary Mull lavas when compared to basalts in igneous provinces such as the Columbia River and Deccan.

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Documento generato il 04/08/20 alle ore 16:22:30