Attachment formation during partitioning of oblique convergence in the Ketilidian orogen, South Greenland.
Subhorizontal attachment zones provide coupling between lithospheric layers in orogenic belts. A mid-crustal attachment zone is exposed in the Palaeoproterozoic Ketilidian orogen, south Greenland, which formed as a result of north-directed oblique convergence at a cordilleran-type margin. Rifting (c...
Published in: | Geological Society, London, Special Publications |
---|---|
Main Authors: | , , , |
Other Authors: | , , |
Format: | Book Part |
Language: | unknown |
Published: |
Geological Society
2004
|
Subjects: | |
Online Access: | http://dro.dur.ac.uk/4081/ https://doi.org/10.1144/GSL.SP.2004.227.01.12 http://www2.geolsoc.org.uk/template.cfm?name=bookshop_details&id=308&CFID=4358450&CFTOKEN=4451dfc10580850a-FB52C7ED-1125-29BA-70893BA8CBAACB09 |
id |
ftunivdurham:oai:dro.dur.ac.uk.OAI2:4081 |
---|---|
record_format |
openpolar |
spelling |
ftunivdurham:oai:dro.dur.ac.uk.OAI2:4081 2023-05-15T16:28:01+02:00 Attachment formation during partitioning of oblique convergence in the Ketilidian orogen, South Greenland. McCaffrey, K. J. W Grocott, J. Garde, A. A. Hamilton, M. A. Grocott, J. McCaffrey, K. J. W. Taylor, G. Tikoff, B. 2004-09-01 http://dro.dur.ac.uk/4081/ https://doi.org/10.1144/GSL.SP.2004.227.01.12 http://www2.geolsoc.org.uk/template.cfm?name=bookshop_details&id=308&CFID=4358450&CFTOKEN=4451dfc10580850a-FB52C7ED-1125-29BA-70893BA8CBAACB09 unknown Geological Society dro:4081 doi:10.1144/GSL.SP.2004.227.01.12 http://dro.dur.ac.uk/4081/ http://www2.geolsoc.org.uk/template.cfm?name=bookshop_details&id=308&CFID=4358450&CFTOKEN=4451dfc10580850a-FB52C7ED-1125-29BA-70893BA8CBAACB09 Grocott, J. & McCaffrey, K. J. W. & Taylor, G. & Tikoff, B. (Eds.). (2004). Vertical coupling & decoupling in the lithosphere. London: Geological Society, pp. 231-248, GSL special publications, Vol.227 Book chapter PeerReviewed 2004 ftunivdurham https://doi.org/10.1144/GSL.SP.2004.227.01.12 2020-05-28T22:26:38Z Subhorizontal attachment zones provide coupling between lithospheric layers in orogenic belts. A mid-crustal attachment zone is exposed in the Palaeoproterozoic Ketilidian orogen, south Greenland, which formed as a result of north-directed oblique convergence at a cordilleran-type margin. Rifting (c. 2.1 Ga) and compressional deformation and magmatism (> 1850 Ma) on the continental margin was followed by an extended sinistral transpression from 1850 to 1730 Ma now separated into three episodes or peaks of activity. The first episode was focused on the back-arc region and was followed by the main arc construction phase during which transpression was partitioned into strike-slip and contraction components. Despite the longevity of this active margin system, individual tectonic events took place rapidly, e.g. development of fore-arc D1-D3 and accompanying high-temperature, low-pressure metamorphism took place over c. 12 Ma. We explain the fore-arc and batholith evolution by the upward migration of an underlying attachment structure through the upper crustal partitioned blocks. This migration may be attributed to an increase in the geothermal gradient accompanied by, or followed by, exhumation of the mid-crust. The partially molten, hence weak, attachment zone solidified and strengthened during cooling before emplacement of the post-orogenic rapakivi suite during the third distinct phase of mild sinistral transpression. Book Part Greenland Durham University: Durham Research Online Greenland Geological Society, London, Special Publications 227 1 231 248 |
institution |
Open Polar |
collection |
Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
description |
Subhorizontal attachment zones provide coupling between lithospheric layers in orogenic belts. A mid-crustal attachment zone is exposed in the Palaeoproterozoic Ketilidian orogen, south Greenland, which formed as a result of north-directed oblique convergence at a cordilleran-type margin. Rifting (c. 2.1 Ga) and compressional deformation and magmatism (> 1850 Ma) on the continental margin was followed by an extended sinistral transpression from 1850 to 1730 Ma now separated into three episodes or peaks of activity. The first episode was focused on the back-arc region and was followed by the main arc construction phase during which transpression was partitioned into strike-slip and contraction components. Despite the longevity of this active margin system, individual tectonic events took place rapidly, e.g. development of fore-arc D1-D3 and accompanying high-temperature, low-pressure metamorphism took place over c. 12 Ma. We explain the fore-arc and batholith evolution by the upward migration of an underlying attachment structure through the upper crustal partitioned blocks. This migration may be attributed to an increase in the geothermal gradient accompanied by, or followed by, exhumation of the mid-crust. The partially molten, hence weak, attachment zone solidified and strengthened during cooling before emplacement of the post-orogenic rapakivi suite during the third distinct phase of mild sinistral transpression. |
author2 |
Grocott, J. McCaffrey, K. J. W. Taylor, G. Tikoff, B. |
format |
Book Part |
author |
McCaffrey, K. J. W Grocott, J. Garde, A. A. Hamilton, M. A. |
spellingShingle |
McCaffrey, K. J. W Grocott, J. Garde, A. A. Hamilton, M. A. Attachment formation during partitioning of oblique convergence in the Ketilidian orogen, South Greenland. |
author_facet |
McCaffrey, K. J. W Grocott, J. Garde, A. A. Hamilton, M. A. |
author_sort |
McCaffrey, K. J. W |
title |
Attachment formation during partitioning of oblique convergence in the Ketilidian orogen, South Greenland. |
title_short |
Attachment formation during partitioning of oblique convergence in the Ketilidian orogen, South Greenland. |
title_full |
Attachment formation during partitioning of oblique convergence in the Ketilidian orogen, South Greenland. |
title_fullStr |
Attachment formation during partitioning of oblique convergence in the Ketilidian orogen, South Greenland. |
title_full_unstemmed |
Attachment formation during partitioning of oblique convergence in the Ketilidian orogen, South Greenland. |
title_sort |
attachment formation during partitioning of oblique convergence in the ketilidian orogen, south greenland. |
publisher |
Geological Society |
publishDate |
2004 |
url |
http://dro.dur.ac.uk/4081/ https://doi.org/10.1144/GSL.SP.2004.227.01.12 http://www2.geolsoc.org.uk/template.cfm?name=bookshop_details&id=308&CFID=4358450&CFTOKEN=4451dfc10580850a-FB52C7ED-1125-29BA-70893BA8CBAACB09 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Grocott, J. & McCaffrey, K. J. W. & Taylor, G. & Tikoff, B. (Eds.). (2004). Vertical coupling & decoupling in the lithosphere. London: Geological Society, pp. 231-248, GSL special publications, Vol.227 |
op_relation |
dro:4081 doi:10.1144/GSL.SP.2004.227.01.12 http://dro.dur.ac.uk/4081/ http://www2.geolsoc.org.uk/template.cfm?name=bookshop_details&id=308&CFID=4358450&CFTOKEN=4451dfc10580850a-FB52C7ED-1125-29BA-70893BA8CBAACB09 |
op_doi |
https://doi.org/10.1144/GSL.SP.2004.227.01.12 |
container_title |
Geological Society, London, Special Publications |
container_volume |
227 |
container_issue |
1 |
container_start_page |
231 |
op_container_end_page |
248 |
_version_ |
1766017623985750016 |