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Mid-crustal partitioning and attachment during oblique convergence in an arc system, Palaeoproterozoic Ketilidian orogen, southern Greenland

ADAM A. GARDE, BRIAN CHADWICK, JOHN GROCOTT, MICHAEL A. HAMILTON, KENNETH J. W. McCAFFREY and CEES P. SWAGER
Journal of the Geological Society, 159, 247-261, 1 May 2002, https://doi.org/10.1144/0016-764901-080
ADAM A. GARDE
11Geological Survey of Denmark and Greenland, Thoravej 8, DK 2400 Copenhagen NV, Denmark
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BRIAN CHADWICK
2212 Pennsylvania Close, Exeter EX4 6DJ, UK
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JOHN GROCOTT
33School of Earth Sciences and Geography, CEESR, Kingston University, Kingston-upon-Thames, Surrey KT1 2EE, UK (e-mail: [email protected])
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MICHAEL A. HAMILTON
44Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada
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KENNETH J. W. McCAFFREY
55Department of Geological Sciences, University of Durham, Durham DH1 3LE, UK
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CEES P. SWAGER
6681 Derby Road, Shenton Park, WA6008, Australia
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Abstract

Abstract: The Ketilidian orogen in SE Greenland contains a continental magmatic arc (Julianehåb batholith) and forearc which formed in the overriding plate of a Palaeoproterozoic oblique subduction boundary between c. 1854 and 1795 Ma. During uplift and deformation of the forearc between c. 1795 and 1780 Ma, its sedimentary sequences were invaded by arc-type magmas and metamorphosed at HT–LP upper amphibolite facies conditions which led to widespread anatexis and generation of abundant S-type granites. Transpression during early deformation (D1) was partitioned into arc-parallel, sinistral strike-slip in the magmatic arc rocks of the batholith and arc-normal contraction in the sedimentary and volcaniclastic sequences of the proximal forearc (Psammite Zone). Subsequently, D1 fabrics in the Psammite Zone were overprinted and transposed in an intense, flat-lying, D2 ductile shear zone with arc-parallel stretching lineations and top-NE kinematic indicators. The kinematic significance of the D2 shear zone is that it accommodated vertical differences in strain and displacement and permitted deformation to be partitioned differently at different levels in the crust. As such, it is an attachment or coupling zone that provided kinematic linkage between deformation at different crustal levels during NE transport of a forearc sliver. Overprinting of the upper crustal domain of D1 strike-slip partitioned transpression in the forearc during D2 is attributed to migration of the attachment zone to a higher crustal level. This migration was a consequence of an enhanced geothermal gradient in the proximal part of the forearc due to the emplacement of batholith-related plutonic suites during D2.

  • Palaeoproterozoic
  • South Greenland
  • Ketilidian orogen
  • transpression
  • coupling
  • © 2002 The Geological Society of London
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Journal of the Geological Society: 159 (3)
Journal of the Geological Society
Volume 159, Issue 3
May 2002
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Mid-crustal partitioning and attachment during oblique convergence in an arc system, Palaeoproterozoic Ketilidian orogen, southern Greenland

ADAM A. GARDE, BRIAN CHADWICK, JOHN GROCOTT, MICHAEL A. HAMILTON, KENNETH J. W. McCAFFREY and CEES P. SWAGER
Journal of the Geological Society, 159, 247-261, 1 May 2002, https://doi.org/10.1144/0016-764901-080
ADAM A. GARDE
11Geological Survey of Denmark and Greenland, Thoravej 8, DK 2400 Copenhagen NV, Denmark
  • Find this author on Google Scholar
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  • Search for this author on this site
BRIAN CHADWICK
2212 Pennsylvania Close, Exeter EX4 6DJ, UK
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  • Search for this author on this site
JOHN GROCOTT
33School of Earth Sciences and Geography, CEESR, Kingston University, Kingston-upon-Thames, Surrey KT1 2EE, UK (e-mail: [email protected])
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
MICHAEL A. HAMILTON
44Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada
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KENNETH J. W. McCAFFREY
55Department of Geological Sciences, University of Durham, Durham DH1 3LE, UK
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CEES P. SWAGER
6681 Derby Road, Shenton Park, WA6008, Australia
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Mid-crustal partitioning and attachment during oblique convergence in an arc system, Palaeoproterozoic Ketilidian orogen, southern Greenland

ADAM A. GARDE, BRIAN CHADWICK, JOHN GROCOTT, MICHAEL A. HAMILTON, KENNETH J. W. McCAFFREY and CEES P. SWAGER
Journal of the Geological Society, 159, 247-261, 1 May 2002, https://doi.org/10.1144/0016-764901-080
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  • Article
    • Abstract
    • Geological setting
    • The Julianehåb batholith in the western part of the Ketilidian orogen
    • Depositional characteristics of the Psammite Zone
    • Structure of the Ketilidian forearc in SE Greenland
    • Partitioning model for the Ketilidian arc–forearc in SE Greenland
    • Conclusions
    • Acknowledgements
    • References
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