Seismotectonic analysis of the Tjörnes Fracture Zone, an active transform fault in north Iceland

1998 ◽  
Vol 103 (B12) ◽  
pp. 30117-30129 ◽  
Author(s):  
Sigurður T. Rögnvaldsson ◽  
Agust Gudmundsson ◽  
Ragnar Slunga
Keyword(s):  
Fracture Zone ◽  
Transform Fault ◽  
Tjörnes Fracture Zone

scholarly journals Local Earthquake Tomography in the Tjörnes Fracture Zone (North Iceland)

2020 ◽  
Author(s):  
Claudia Abril ◽  
Ari Tryggvason ◽  
Ólafur Gudmundsson ◽  
Rebekka Steffen
Keyword(s):  
Fracture Zone ◽  
Local Earthquake Tomography ◽  
Local Earthquake ◽  
Tjörnes Fracture Zone

Deep-tow studies of the Vema Fracture Zone: 1. Tectonics of a major slow slipping transform fault and its intersection with the Mid-Atlantic Ridge

1986 ◽  
Vol 91 (B3) ◽  
pp. 3334-3354 ◽  
Author(s):  
Ken. C. Macdonald ◽  
David A. Castillo ◽  
Stephen P. Miller ◽  
Paul J. Fox ◽  
Kim A. Kastens ◽  
...  
Keyword(s):  
Fracture Zone ◽  
Transform Fault ◽  
Mid Atlantic Ridge

Petrology of a transform fault zone and adjacent ridge segments

1971 ◽  
Vol 268 (1192) ◽  
pp. 423-441 ◽  
Keyword(s):  
Oceanic Crust ◽  
Fault Zone ◽  
Fracture Zone ◽  
Volcanic Eruptions ◽  
Spreading Ridge ◽  
Transform Fault ◽  
Transform Faults ◽  
Near Surface ◽  
The North ◽  
Transform Fault Zone

The Verna Fracture Zone in the North Atlantic (9 to 11° N), which has been identified as a transform fault zone, contains exposures of serpentinized peridotites, while its adjacent ridge segments are floored mainly by typical abyssal ocean ridge basalts. This petrologic contrast correlates with the greater frequency of volcanic eruptions along the actively spreading ridge segments compared to the transform fault zone. Where rifting components occur across transform faults, exposures of the deeper zone of oceanic crust may result. The bathymetry of the Verna Fracture Zone suggests that some uplift parallel to the fracture zone as well as rifting led to exposures of deeper rocks. The basalts from the adjacent ridge axes contain ‘xenocrysts’ of plagioclase and olivine and more rarely of chromite. These appear to have a cognate origin, perhaps related to cooling and convection in near surface magma chambers. The basalts from the ridge axes, offset and on opposite sides of the transform fault, have similar features and compositions. The plagioclase peridotites have mineralogical features which indicate equilibration in the plagioclase pyrolite facies, suggesting maximum equilibration depths of around 30 km for a temperature of around 1200 °C. The chemical characteristics of the Vema F.Z. peridotites suggest that they may be undifferentiated mantle, emplaced as a subsolidus hot plastic intrusion or as a crystal mush. The abundance of peridotites and serpentinized peridotites is believed to reflect their abundance in seismic layer three of the oceanic crust.

Mapping of a segment of the Romanche Fracture Zone: A morphostructural analysis of a major transform fault of the equatorial Atlantic Ocean

Geology ◽  
1991 ◽  
Vol 19 (8) ◽  
pp. 795 ◽  
Author(s):  
José Honnorez ◽  
Jean Mascle ◽  
Christophe Basile ◽  
Pierre Tricart ◽  
Michel Villeneuve ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Fracture Zone ◽  
Transform Fault ◽  
Equatorial Atlantic ◽  
Equatorial Atlantic Ocean ◽  
Romanche Fracture Zone

Vema fracture zone transform fault

Geology ◽  
1975 ◽  
Vol 3 (10) ◽  
pp. 555 ◽  
Author(s):  
Stephen Eittreim ◽  
John Ewing
Keyword(s):  
Fracture Zone ◽  
Transform Fault

Hypocenter migration of fluid-induced earthquake swarms in the Tjörnes Fracture Zone (North Iceland)

2008 ◽  
Vol 447 (1-4) ◽  
pp. 80-94 ◽  
Author(s):  
Martin Hensch ◽  
Carsten Riedel ◽  
Jörg Reinhardt ◽  
Torsten Dahm
Keyword(s):  
Fracture Zone ◽  
Earthquake Swarms ◽  
Induced Earthquake ◽  
Tjörnes Fracture Zone

Geology of the Northern End of Juan de Fuca Ridge and Sea-Floor Spreading

1974 ◽  
Vol 11 (10) ◽  
pp. 1384-1406 ◽  
Author(s):  
Sandra M. Barr ◽  
R. L. Chase
Keyword(s):  
Magnetic Anomaly ◽  
Fracture Zone ◽  
Juan De Fuca Ridge ◽  
Transform Fault ◽  
Sea Floor ◽  
Fuca Ridge ◽  
Juan De Fuca ◽  
Low Potassium ◽  
Sea Floor Spreading ◽  
Ocean Ridge

The northern end of Juan de Fuca Ridge consists of a series of basement ridges and valleys, inundated with sediment except for the axis of most recent sea-floor spreading. This axis is associated with the western of two branches of the Brunhes magnetic anomaly. The eastern branch of the magnetic anomaly is associated with a largely sediment-covered ridge, apparently produced by spreading early in the Brunhes Epoch. The intervening negative anomaly is probably caused by reversely magnetized rocks older than 0.7 m.y. Basalts dredged from the region of the northern end of Juan de Fuca Ridge have compositions typical of low-potassium ocean ridge basalts. They differ from basalts reported from the southern part of Juan de Fuca Ridge which have higher K2O, TiO2, FeOT, and FeOT/MgO. This difference is compatible with the hypothesis that a mantle plume exists under the southern part of the ridge. Distribution of earthquake epicenters suggests that the Queen Charlotte Fault Zone presently extends south of Explorer Ridge to intersect Juan de Fuca Ridge at 49°N and that the Sovanco Fracture Zone no longer functions as a transform fault.

Occurrence of kaolinite and mixed-layer kaolinite/smectite in hydrothermal sediments of Grimsey Graben, Tjörnes Fracture Zone (north of Iceland)

2005 ◽  
Vol 215 (3-4) ◽  
pp. 159-170 ◽  
Author(s):  
V.M. Dekov ◽  
J. Scholten ◽  
R. Botz ◽  
C.-D. Garbe-Schönberg ◽  
M. Thiry ◽  
...  
Keyword(s):  
Mixed Layer ◽  
Fracture Zone ◽  
Hydrothermal Sediments ◽  
Tjörnes Fracture Zone
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