antarctic peninsula path since breakup: review and implications for james ross basin development...
TRANSCRIPT
![Page 1: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/1.jpg)
Antarctic Peninsula path since breakup: review and
implications for James Ross Basin development
Marta E. Ghidella
Instituto Antártico Argentino
![Page 2: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/2.jpg)
Introduction
Examine of the Antactic Peninsula path for four tectonic models:
1. Ghidella et al (2002)
2. Lawver et al (1999)
3. Livermore – Nankivell – Eagles (1996, 1997, 2000)
4. Jokat et al (2003)
Examine the relationship of the AP path with James Ross Basin development
![Page 3: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/3.jpg)
James Ross
Basin
![Page 4: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/4.jpg)
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
![Page 5: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/5.jpg)
Ghidella et al
Reconstructions begin ...
Next:
![Page 6: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/6.jpg)
Ghi - 160 - SAM
fixedGhi – 160 - SAM
fixed
![Page 7: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/7.jpg)
Ghi-147-SAM
fixed
![Page 8: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/8.jpg)
Ghi –131 - SAM
fixed
![Page 9: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/9.jpg)
Ghi – 118 - SAM
fixed
![Page 10: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/10.jpg)
Ghi – 90 - SAM
fixed
![Page 11: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/11.jpg)
Ghi – 83 - SAM
fixed
![Page 12: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/12.jpg)
Ghi – 66 - SAM
fixed
![Page 13: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/13.jpg)
Ghi – 33 - SAM
fixed
![Page 14: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/14.jpg)
Ghi - 26 - SAM
fixed
![Page 15: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/15.jpg)
back Ghi – 0 – SAM
fixed
![Page 16: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/16.jpg)
Lawver et al
Reconstructions continue ...
Next:
![Page 17: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/17.jpg)
Law – 160 – SAM
fixed
![Page 18: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/18.jpg)
Law – 147 – SAM
fixed
![Page 19: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/19.jpg)
Law – 131 – SAM
fixed
![Page 20: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/20.jpg)
Law – 118 – SAM fixed
![Page 21: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/21.jpg)
Law – 90 – SAM
fixed
![Page 22: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/22.jpg)
Law – 83 – SAM fixed
![Page 23: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/23.jpg)
Law – 66 – SAM fixed
![Page 24: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/24.jpg)
Law – 33 – SAM fixed
![Page 25: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/25.jpg)
Law – 26 – SAM fixed
![Page 26: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/26.jpg)
Law – 0 – SAM fixedback
![Page 27: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/27.jpg)
Jokat et al
Reconstructions continue ...
Next:
![Page 28: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/28.jpg)
Jo – 159 – SAM fixed
![Page 29: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/29.jpg)
Jo – 147 – SAM fixed
![Page 30: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/30.jpg)
Jo – 131 – SAM fixed
![Page 31: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/31.jpg)
Jo – 118 – SAM fixed
![Page 32: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/32.jpg)
Jo – 90 – SAM fixed
![Page 33: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/33.jpg)
Jo – 83 – SAM fixed
![Page 34: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/34.jpg)
Jo – 66 – SAM fixed
![Page 35: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/35.jpg)
Jo – 33 – SAM fixed
![Page 36: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/36.jpg)
Jo – 26 – SAM fixed
![Page 37: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/37.jpg)
Jo – 0 – SAM fixedback
![Page 38: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/38.jpg)
Livermore – Nankivell - Eagles
Reconstructions continue ...
Next:
![Page 39: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/39.jpg)
Liv – 165 – SAM fixed
![Page 40: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/40.jpg)
Liv – 150 – SAM fixed
![Page 41: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/41.jpg)
Liv – 132 – SAM fixed
![Page 42: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/42.jpg)
Liv – 119 – SAM fixed
![Page 43: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/43.jpg)
Liv – 93 – SAM fixed
![Page 44: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/44.jpg)
Liv – 83 – SAM fixed
![Page 45: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/45.jpg)
Liv – 66 – SAM fixed
![Page 46: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/46.jpg)
Liv – 33 – SAM fixed
![Page 47: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/47.jpg)
Liv – 26 – SAM fixed
![Page 48: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/48.jpg)
Liv – 0 – SAM fixedback
![Page 49: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/49.jpg)
End of reconstructions
![Page 50: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/50.jpg)
LawverGhidella
Jokat Livermore
All paths at present
![Page 51: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/51.jpg)
Reconstruction of the magnetic anomaly field in the Scotia Sea at 66.6 Ma by Graeme Eagles
![Page 52: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/52.jpg)
Our plot of 66.5 Ma with ANT fixed
![Page 53: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/53.jpg)
• 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
Comparison
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.
![Page 54: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/54.jpg)
AP velocity
Rotation near AP
tipAP overrides oceanic crust
Pow
ell B
asin
op
en
s
James Ross Basin subsidence and tectonic episodes
Sou
th A
tlan
tic
op
en
s
![Page 55: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/55.jpg)
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
tectonics2) 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 ?
Summary
![Page 56: Antarctic Peninsula path since breakup: review and implications for James Ross Basin development Marta E. Ghidella Instituto Antártico Argentino](https://reader037.vdocuments.mx/reader037/viewer/2022110322/56649d165503460f949ebf42/html5/thumbnails/56.jpg)
Thank you for your attention ...
end