Fault and magmatic interaction within Iceland's western rift over the last 9kyr

Bull, J.M.; Minshull, T.A.; Mitchell, N.C.; Thors, K.; Dix, J.K.; Best, A.I.. 2003 Fault and magmatic interaction within Iceland's western rift over the last 9kyr. Geophysical Journal International, 154 (1). F1-F8. 10.1046/j.1365-246X.2003.01990.x

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We present high-resolution 'Chirp' sub-bottom profiler data from Thingvallavatn, a lake in Iceland's western rift zone. These data are combined with stratigraphic constraints from sediment cores to show that movement on normal faults since 9 ka are temporally correlated with magmatic events, indicating that movements were controlled by episodic dyke intrusion. Sediment depo-centres and the focus of subsidence migrated westwards over 3-4 kyr towards the locus of subsequent brittle failure. We interpret this subsidence as related to dyke intrusion a few km along strike, originating from the Hengill volcanic system, which occurred prior to major dyking, faulting and subsidence within the lake at 1.9 ka.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1046/j.1365-246X.2003.01990.x
ISSN: 0956-540X
Additional Keywords: faulting, Iceland, tectonics, volcanic activity
Date made live: 10 May 2004 +0 (UTC)

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