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The volcanic and sedimentary evolution of the Faeroe plateau lava group, Faeroe Islands and Faeroe-Shetland Basin, NE Atlantic

Passey, Simon Richard (2004) The volcanic and sedimentary evolution of the Faeroe plateau lava group, Faeroe Islands and Faeroe-Shetland Basin, NE Atlantic. PhD thesis, University of Glasgow.

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Abstract

Geochemical analysis of the volcanic interval in Well 214/4-1, Faeroe-Shetland Basin, has enabled a correlation to the Lower Basalt Formation of the Faeroe Islands, ca. 240 km to the W. The volcanic interval consists of a ca. 450 m thick sequence of hyaloclastites, which are overlain by a ca. 50 m thick subaerial lava sequence. This volcanic interval is interpreted to have formed at a palaeoshoreline environment, where subaerial lavas flowed from the land surface into a substantial body of water at least 450 m deep (i.e. the Faeroe-Shetland Basin at that time), resulting in the quenching and fragmentation of magma to product the hyaloclastities. Well 214/4-1 is <50 km to the SE of the Faeroe-Shetland Escarpment, which has previously been interpreted as a hyaloclastite delta, thus implying that there a number of unrecognised hyaloclastite units within the Faeroe-Shetland Basin and that the coastline was steadily encroaching W/NW, towards the Faeroe Islands during the volcanic interval. The overlying ca. 10 m thick Coal-bearing Formation (CBF) represents a significant hiatus in the volcanic activity at the end of LBF times. Erosion and subsidence of the lava field led to the development of an expansive lacustrine environment, which resulted in the accumulation of plant material and associated detritus and chemical sediments, mainly ironstones, and the formation of mineable coal seams. Petrographic and geochemical analysis of siderite spherules within the ironstone beds from two localities on Suðuroy have helped to define margin- and centre of-lake environments, at least 10 km apart. Contemporaneous fluviatile lithologies in West Suðuroy are composed of reworked palagonitised tephra, basalt lava clasts and plant material.

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Subjects: Q Science > QE Geology
Colleges/Schools: College of Science and Engineering > School of Geographical and Earth Sciences
Supervisor's Name: Bell, Dr. Brian
Date of Award: 2004
Depositing User: Angi Shields
Unique ID: glathesis:2004-3504
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 04 Jul 2012
Last Modified: 10 Dec 2012 14:08
URI: http://theses.gla.ac.uk/id/eprint/3504

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