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

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

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003geoji.154f...1b&link_type=abstract

Geophysical Journal International, Volume 154, Issue 1, pp. F1-F8.

Astronomy and Astrophysics

Astronomy

4

Faulting, Iceland, Tectonics, Volcanic Activity

Scientific paper

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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