Greenland Fracture Zone-East Greenland Ridge(s) revisited: Indications of a C22-change in plate motion?

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Greenland Fracture Zone-East Greenland Ridge(s) revisited: Indications of a C22-change in plate motion?. / Døssing, Arne; Funck, T.

In: Journal of Geophysical Research, Vol. 117, 2012, p. B01103.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Døssing, Arne; Funck, T. / Greenland Fracture Zone-East Greenland Ridge(s) revisited: Indications of a C22-change in plate motion?.

In: Journal of Geophysical Research, Vol. 117, 2012, p. B01103.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

Bibtex

@article{8ddb9e25971a4b7b83a72c101d313744,
title = "Greenland Fracture Zone-East Greenland Ridge(s) revisited: Indications of a C22-change in plate motion?",
publisher = "American Geophysical Union",
author = "Arne Døssing and T. Funck",
year = "2012",
doi = "10.1029/2011JB008393",
volume = "117",
pages = "B01103",
journal = "Journal of Geophysical Research",
issn = "0148-0227",

}

RIS

TY - JOUR

T1 - Greenland Fracture Zone-East Greenland Ridge(s) revisited: Indications of a C22-change in plate motion?

A1 - Døssing,Arne

A1 - Funck,T.

AU - Døssing,Arne

AU - Funck,T.

PB - American Geophysical Union

PY - 2012

Y1 - 2012

N2 - Changes in the lithospheric stress field, causing axial rift migration and reorientation of the transform, are generally proposed as an explanation for anomalously old crust and/or major aseismic valleys in oceanic ridge-transform-ridge settings. Similarly, transform migration of the Greenland Fracture Zone and separation of the 200-km-long, fracture-zone-parallel continental East Greenland Ridge from the Eurasia plate is thought to be related to a major change in relative plate motions between Greenland and Eurasia during the earliest Oligocene (Chron 13 time). This study presents a reinterpretation of the Greenland Fracture Zone -East Greenland Ridge based on new and existing geophysical data. Evidence is shown for two overstepping ridge segments (Segments A and B) of which Segment A corresponds to the already known East Greenland Ridge while Segment B was not detected previously. Interpretation of sonobuoy data and revised modeling of existing OBS data across Segment B indicate a continental composition of the segment. This interpretation is supported by magnetic anomaly data. The Segments A and B are bounded by portions of the Greenland Fracture Zone with a distinct similar to 10 degrees difference in strike. This is suggested to relate to an early episode of transform migration and reorientation of the lithospheric stress field around Chron 22 time, i.e., shortly after the Eocene breakup in the northern NE Atlantic. These findings contradict with previous interpretations of the fracture zone, which infer simple pre-C13 strike-slip kinematics.

AB - Changes in the lithospheric stress field, causing axial rift migration and reorientation of the transform, are generally proposed as an explanation for anomalously old crust and/or major aseismic valleys in oceanic ridge-transform-ridge settings. Similarly, transform migration of the Greenland Fracture Zone and separation of the 200-km-long, fracture-zone-parallel continental East Greenland Ridge from the Eurasia plate is thought to be related to a major change in relative plate motions between Greenland and Eurasia during the earliest Oligocene (Chron 13 time). This study presents a reinterpretation of the Greenland Fracture Zone -East Greenland Ridge based on new and existing geophysical data. Evidence is shown for two overstepping ridge segments (Segments A and B) of which Segment A corresponds to the already known East Greenland Ridge while Segment B was not detected previously. Interpretation of sonobuoy data and revised modeling of existing OBS data across Segment B indicate a continental composition of the segment. This interpretation is supported by magnetic anomaly data. The Segments A and B are bounded by portions of the Greenland Fracture Zone with a distinct similar to 10 degrees difference in strike. This is suggested to relate to an early episode of transform migration and reorientation of the lithospheric stress field around Chron 22 time, i.e., shortly after the Eocene breakup in the northern NE Atlantic. These findings contradict with previous interpretations of the fracture zone, which infer simple pre-C13 strike-slip kinematics.

UR - http://www.agu.org/pubs/crossref/2012/2011JB008393.shtml

U2 - 10.1029/2011JB008393

DO - 10.1029/2011JB008393

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

SN - 0148-0227

VL - 117

SP - B01103

ER -