Antarctic Peninsula path since breakup: review and implications for James Ross Basin development
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Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino. Introduction. Examine of the Antactic Peninsula path for four tectonic models:. Ghidella et al (2002) Lawver et al (1999)

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Antarctic Peninsula path since breakup: review and implications for James Ross Basin developmentMarta E. GhidellaInstituto Antártico Argentino


Introduction
Introduction implications for James Ross Basin development

  • Examine of the Antactic Peninsula path for four tectonic models:

Ghidella et al (2002)

Lawver et al (1999)

Livermore – Nankivell – Eagles (1996, 1997, 2000)

Jokat et al (2003)

  • Examine the relationship of the AP path with James Ross Basin development


James ross basin
James Ross Basin implications for James Ross Basin development


Reconstructions
Reconstructions implications for James Ross Basin development

  • We are going to show reconstructions for the SAM movement, ANT kept fixed

  • We are not including the reconstruction of the Scotia plate

  • The plots include synthetic isochrons, calculated from rotated C34 picks.

  • The path of one point of the tip of the Antarctic Peninsula will be displayed for each epoch


Ghidella et al
Ghidella et al implications for James Ross Basin development

Reconstructions begin ...

Next:


Ghi 160 sam fixed
Ghi - 160 - SAM fixed implications for James Ross Basin development

Ghi – 160 - SAM fixed


Ghi 147 sam fixed
Ghi-147-SAM fixed implications for James Ross Basin development


Ghi 131 sam fixed
Ghi –131 - SAM fixed implications for James Ross Basin development


Ghi 118 sam fixed
Ghi – 118 - SAM fixed implications for James Ross Basin development


Ghi 90 sam fixed
Ghi – 90 - SAM fixed implications for James Ross Basin development


Ghi 83 sam fixed
Ghi – 83 - SAM fixed implications for James Ross Basin development


Ghi 66 sam fixed
Ghi – 66 - SAM fixed implications for James Ross Basin development


Ghi 33 sam fixed
Ghi – 33 - SAM fixed implications for James Ross Basin development


Ghi 26 sam fixed
Ghi - 26 - SAM fixed implications for James Ross Basin development


Ghi 0 sam fixed
Ghi – 0 – SAM fixed implications for James Ross Basin development

back


Lawver et al
Lawver et al implications for James Ross Basin development

Reconstructions continue ...

Next:


Law 160 sam fixed
Law – 160 – SAM fixed implications for James Ross Basin development


Law 147 sam fixed
Law – 147 – SAM fixed implications for James Ross Basin development


Law 131 sam fixed
Law – 131 – SAM fixed implications for James Ross Basin development


Law 118 sam fixed
Law – 118 – SAM fixed implications for James Ross Basin development


Law 90 sam fixed
Law – 90 – SAM fixed implications for James Ross Basin development


Law 83 sam fixed
Law – 83 – SAM fixed implications for James Ross Basin development


Law 66 sam fixed
Law – 66 – SAM fixed implications for James Ross Basin development


Law 33 sam fixed
Law – 33 – SAM fixed implications for James Ross Basin development


Law 26 sam fixed
Law – 26 – SAM fixed implications for James Ross Basin development


Law 0 sam fixed
Law – 0 – SAM fixed implications for James Ross Basin development

back


Jokat et al
Jokat et al implications for James Ross Basin development

Reconstructions continue ...

Next:


Jo 159 sam fixed
Jo – 159 – SAM fixed implications for James Ross Basin development


Jo 147 sam fixed
Jo – 147 – SAM fixed implications for James Ross Basin development


Jo 131 sam fixed
Jo – 131 – SAM fixed implications for James Ross Basin development


Jo 118 sam fixed
Jo – 118 – SAM fixed implications for James Ross Basin development


Jo 90 sam fixed
Jo – 90 – SAM fixed implications for James Ross Basin development


Jo 83 sam fixed
Jo – 83 – SAM fixed implications for James Ross Basin development


Jo 66 sam fixed
Jo – 66 – SAM fixed implications for James Ross Basin development


Jo 33 sam fixed
Jo – 33 – SAM fixed implications for James Ross Basin development


Jo 26 sam fixed
Jo – 26 – SAM fixed implications for James Ross Basin development


Jo 0 sam fixed
Jo – 0 – SAM fixed implications for James Ross Basin development

back


Livermore nankivell eagles
Livermore – Nankivell - Eagles implications for James Ross Basin development

Reconstructions continue ...

Next:


Liv 165 sam fixed
Liv – 165 – SAM fixed implications for James Ross Basin development


Liv 150 sam fixed
Liv – 150 – SAM fixed implications for James Ross Basin development


Liv 132 sam fixed
Liv – 132 – SAM fixed implications for James Ross Basin development


Liv 119 sam fixed
Liv – 119 – SAM fixed implications for James Ross Basin development


Liv 93 sam fixed
Liv – 93 – SAM fixed implications for James Ross Basin development


Liv 83 sam fixed
Liv – 83 – SAM fixed implications for James Ross Basin development


Liv 66 sam fixed
Liv – 66 – SAM fixed implications for James Ross Basin development


Liv 33 sam fixed
Liv – 33 – SAM fixed implications for James Ross Basin development


Liv 26 sam fixed
Liv – 26 – SAM fixed implications for James Ross Basin development


Liv 0 sam fixed
Liv – 0 – SAM fixed implications for James Ross Basin development

back


End of reconstructions
End of reconstructions implications for James Ross Basin development


All paths at present
All paths at present implications for James Ross Basin development

Lawver

Ghidella

Jokat

Livermore



Our plot of 66 5 ma with ant fixed
Our plot of 66.5 Ma with ANT fixed Sea at 66.6 Ma by Graeme Eagles


Comparison
Comparison Sea at 66.6 Ma by Graeme Eagles

  • Some features of James Ross Basin evolution from del Valle et al (1995)

  • Inferences from common features of the AP path in the four reconstructions

del Valle, R.A., Lirio, J.M., Rinaldi, C.A., 1993: Sedimentación y tectónica en la cuenca de Larsen, Antártida. Proc. of the XII Congreso Geológico Argentino, vol. III, 135-143.


Ap velocity

James Ross Basin subsidence and tectonic episodes Sea at 66.6 Ma by Graeme Eagles

AP velocity

South Atlantic opens

Powell Basin opens

Rotation near AP tip

AP overrides oceanic crust


Summary
Summary Sea at 66.6 Ma by Graeme Eagles

The four models differ before the opening of the South Atlantic (~132 Ma)

Common features afterwards:

1) Rotation near AP tip ~ 120 – 90 Ma ... (30 Ma !!!!)

JRB: slow rate of sedimentation

episodes of compressive wrench tectonics

2) AP overriding SAM-ANT oceanic crust -> ~ 80 – 34 Ma

JRB: increased sedimentation rate during 15 Ma

episodes of compressive wrench tectonics

Perhaps the compressive tectonics is more important in 2 ?


end Sea at 66.6 Ma by Graeme Eagles

Thank you for your attention ...


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