Fault and magmatic interaction within Iceland's western rift over the last 9kyr
Fault and magmatic interaction within Iceland's western rift over the last 9kyr
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.
faulting, Iceland, tectonics, volcanic activity
F1-F8
Bull, J.M.
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Minshull, T.A.
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Mitchell, N.C.
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Thors, K.
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Dix, J.K.
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Best, A.I.
cad03726-10f8-4f90-a3ba-5031665234c9
2003
Bull, J.M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Minshull, T.A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Mitchell, N.C.
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Thors, K.
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Dix, J.K.
efbb0b6e-7dfd-47e1-ae96-92412bd45628
Best, A.I.
cad03726-10f8-4f90-a3ba-5031665234c9
Bull, J.M., Minshull, T.A., Mitchell, N.C., Thors, K., Dix, J.K. and Best, A.I.
(2003)
Fault and magmatic interaction within Iceland's western rift over the last 9kyr.
Geophysical Journal International, 154 (1), .
(doi:10.1046/j.1365-246X.2003.01990.x).
Abstract
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.
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Published date: 2003
Keywords:
faulting, Iceland, tectonics, volcanic activity
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Local EPrints ID: 2046
URI: http://eprints.soton.ac.uk/id/eprint/2046
ISSN: 0956-540X
PURE UUID: 1bb847e5-24bf-4468-bb04-fc1a2c4b1e30
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Date deposited: 10 May 2004
Last modified: 16 Mar 2024 03:11
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Author:
N.C. Mitchell
Author:
K. Thors
Author:
A.I. Best
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