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Titolo:
MECHANISMS OF CRUSTAL ACCRETION IN ICELAND
Autore:
HARDARSON BS; FITTON JG;
Indirizzi:
SCOTTISH UNIV RES & REACTOR CTR,SCOTTISH ENTERPRISE TECHNOL PK,RANKINE AVE E KILBRIDE G75 0QF LANARK SCOTLAND UNIV EDINBURGH,DEPT GEOL & GEOPHYS EDINBURGH EH9 3JW MIDLOTHIAN SCOTLAND
Titolo Testata:
Geology
fascicolo: 11, volume: 25, anno: 1997,
pagine: 1043 - 1046
SICI:
0091-7613(1997)25:11<1043:MOCAII>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
REYKJANES-PENINSULA; PLUME; CONSTRAINTS; BASALTS; LAVAS; ND;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
B.S. Hardarson e J.G. Fitton, "MECHANISMS OF CRUSTAL ACCRETION IN ICELAND", Geology, 25(11), 1997, pp. 1043-1046

Abstract

Basalt from the Tertiary lava pile in Iceland is much more homogeneous in composition than that erupted in the axial rift zone. Lavas highly depleted in incompatible elements are occasionally erupted in the latter but have not been reported from the Tertiary succession. This observation leads to a useful test of the Palmason model of crustal accretion in which axial lava flows ultimately form the lower levels of thelava pile, and only flows emplaced off-axis remain accessible in the upper part of the crust. Axial flows large enough to spill out Of the rift axis, and flows erupted on the rift flanks, should therefore havea uniform composition similar to that of the Tertiary flows. Here we test this prediction and thereby the validity of the Palmason model ofcrustal accretion in oceanic spreading centers, Our data show that depleted basalt is confined to small-volume lava flows within the rift axis, Furthermore, large flows that originated within the axial zone and spread far enough to become preserved in the accessible part of the future off-axis lava pile are very homogeneous in composition and comparable to those forming the Tertiary lava successions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 10:43:14