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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
  • 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
reconstructions
Reconstructions
  • 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

Reconstructions begin ...

Next:

ghi 160 sam fixed
Ghi - 160 - SAM fixed

Ghi – 160 - SAM fixed

lawver et al
Lawver et al

Reconstructions continue ...

Next:

jokat et al
Jokat et al

Reconstructions continue ...

Next:

livermore nankivell eagles
Livermore – Nankivell - Eagles

Reconstructions continue ...

Next:

all paths at present
All paths at present

Lawver

Ghidella

Jokat

Livermore

comparison
Comparison
  • 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

AP velocity

South Atlantic opens

Powell Basin opens

Rotation near AP tip

AP overrides oceanic crust

summary
Summary

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 ?

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end

Thank you for your attention ...

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