2016-11-15
Reykjanes ridge From Iceland
to Bight
Evolution of a plate boundary
Ármann Höskuldsson, Fernando Matinez, Richard Hey, sigvaldi
Þordarson and Asdis Benediktsdottir
The north Atlantic igneous province
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2016-11-15
Deep sea mapping
GREENLAND
ICELAND
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2016-11-15
SATELLITE-DERIVED FREE AIR GRAVITY ANOMALY
GREENLAND
ICELAND
Multibeam, magnetics and gravity
2016-11-15
Dr. Ármann Höskuldsson
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2016-11-15
Plate boundary does not mirror crust
Anomaly 6 ~ 20 Ma
Anomaly 5 ~ 9 Ma
2016-11-15
Dr. Ármann Höskuldsson
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Reykjanes mission in 2007 reveals the northernmost part of the
Reykjanes ridge
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2016-11-15
Timing of plate boundary displacement
Vestfjord
Snæfellsnes
Hvalfjord
2016-11-15
Dr. Ármann Höskuldsson
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Evolution of the plate boundary across Iceland
2016-11-15
Dr. Ármann Höskuldsson
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5
2016-11-15
Seccond solution for the rift jumps
Westfjord
Husavikurkleif
Snæfellsnes
Hvalfjord
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2016-11-15
Down to about 61°N only few vents are observed that do seam to have
erupted after the plate left the 10 km wide plate boundary
Reykjanes 2007, first central volcano and caldera to be observed on the
Reykjanes ridge
Njörður central
volcano
Caldera
fault
With of the plate boundary is about 10 km and no volcanism observed out side the
boundary
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2016-11-15
Evolution of the plate boundary across Iceland
2016-11-15
Dr. Ármann Höskuldsson
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Survey 2013
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2016-11-15
SATELLITE-DERIVED FREE AIR GRAVITY ANOMALY
GREENLAND
ICELAND
The survey in 2013 was to look at the evolution of the plate boundary
towards southernmost extremity of Reykjanes ridge.
Research area
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2016-11-15
Close up of the research area, it covers about 96.000 km2 and extends
south of the Bight fracture zone to about 56°N.
R/V MARCUS G LANGSETH
SIMRAD EM122 MULTIBEAM
BACKSCATTER IMAGERY
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2016-11-15
COMPILED SHIP MAGNETIC ANOMALY DATA
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2016-11-15
Lets fly
BIGHT FZ AREA BOUGUER GRAVITY ANOMALY
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2016-11-15
BIGHT AREA SEAFLOOR MAGNETIZATION INVERSION
Segment south og Bight fracture zone shows typical orthogonal rift/fault
relation.
Off rift volcanoes
Off rift volcanoes
Numerous off rift volcanoes are observed on this segment, extending up to
60 km west of the plate boundary and 45 km east of the boundary.
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2016-11-15
SEAFLOOR MAGNETIZATION INVERSION
BIGHT FZ AREA MULTIBEAM SIDESCAN IMAGERY
LOW
HIGH
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2016-11-15
Bottom currents and transform faults
BIGHT FZ AREA MULTIBEAM BATHYMETRY
15
2016-11-15
Serpentinization –Peridotite –
methan - green house gases
Oblique faulting of Reykjanes ridge are due to overprinting of the plate
boundary propagating southward from Iceland, driven by the Icelandic
Hot spot.
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2016-11-15
Termination of the Reykjanesridge
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2016-11-15
MAGNETIC
ANOMALIES
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