ICONS atlas: SAM - Austral Basin

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Overview

This page bundles the available data for the Austral Basin in the South America. The images are hyperlinks and will open up a separate window with a high resolution PDF image of the map.
The basin data is derived from a lower resolution grid which has been upsampled using GMT. This could have introduced an accuracy which is beyond the original data resolution.

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Austral Basin location map
Basin name Austral Basin
Region code SAM
Basin ID 2080
Plate location/code compress foreland/CMF
Basin cross section

The basin cross section is automatically generated using the available crustal structure data sets. Sometimes the data labels are not plotted correctly, depending on the length of the section.

The location of the profile is indicated in all maps as dashed-dotted thin black line. For the endpoints of the profile, the two points of a given polygon located farthest away from each other were computed.

Austral Basin cross section
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Dynamic topography evolution for basin centroid
Austral Basin dynamic topography through time

The dynamic topography history for the basin is derived by tracking the basin centroid. The paleo-location for this point is computed using the EarthByte plate kinematic framework rotating the position back in time.

The dynamic topography model is derived from the S20RTS seismic tomography model (Ritsema et al., 99) by converting seismic velocites to density anomalies using an empirical scaling factor of 0.25. The density anomalies are then advected back in time to compute mantle flow with plate motions superimposed (using the EarthByte plate rotation framework) as surface boundary conditions. The dynamic topography is then derived from the computed density distribution using a free upper boundary. For details regarding the methodology see the following papers:

  • B. Steinberger, H. Schmeling, and G. Marquart. Large-scale lithospheric stress field and topography induced by global mantle circulation. Earth Planet. Sci. Lett., 186:75-91, 2001.
    doi: 10.1016/S0012-821X(01)00229-1.
  • B. Steinberger. Effects of latent heat release at phase boundaries on flow in the Earth's mantle, phase boundary topography and dynamic topography at the Earth's surface. Phys. Earth Planet. Int., 164:2-20, 2007.
    doi: 10.1016/j.pepi.2007.04.021.

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Observations

Mantle Lid thickness
Austral Basin location map
Statistics - Mantle Lid thickness
Median 75.361
Mean 73.149
Scale 3.078
stdev 4.795
Z_min/Location 62.411/-54.0°Lat -69.0°Lon
Z_max/Location 81.500/ -52.0°Lat -70.0°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Depth of 550 deg isotherm
Austral Basin location map
Statistics - Depth of 550 deg isotherm
Median -34.772
Mean -34.239
Scale 0.338
stdev 0.907
Z_min/Location -35.001/-48.6°Lat -71.5667°Lon
Z_max/Location -32.000/ -54.0°Lat -68.0°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Mobil isopachs
Austral Basin location map
Statistics - Mobil isopachs
Median 3.970
Mean 3.631
Scale 0.999
stdev 1.526
Z_min/Location -0.098/-48.8667°Lat -69.9°Lon
Z_max/Location 7.036/ -51.6333°Lat -71.8°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Plain crustal thickness
Austral Basin location map
Statistics - Plain crustal thickness
Median 30.633
Mean 29.654
Scale 2.854
stdev 3.372
Z_min/Location 17.053/-53.3°Lat -71.6667°Lon
Z_max/Location 35.071/ -51.4667°Lat -72.0333°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Base middle crust
Austral Basin location map
Statistics - Base middle crust
Median -21.834
Mean -21.420
Scale 1.037
stdev 1.525
Z_min/Location -23.632/-53.7667°Lat -69.4667°Lon
Z_max/Location -12.132/ -53.3°Lat -71.6667°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Base lower crust
Austral Basin location map
Statistics - Base lower crust
Median -32.053
Mean -31.623
Scale 2.198
stdev 2.556
Z_min/Location -35.686/-51.3667°Lat -71.9667°Lon
Z_max/Location -18.259/ -53.3°Lat -71.6667°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Total crustal thickness
Austral Basin location map
Statistics - Total crustal thickness
Median 32.336
Mean 31.881
Scale 2.518
stdev 2.758
Z_min/Location 17.471/-53.3°Lat -71.6667°Lon
Z_max/Location 36.045/ -51.3333°Lat -71.9333°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Base upper crust
Austral Basin location map
Statistics - Base upper crust
Median -11.415
Mean -11.218
Scale 0.664
stdev 0.805
Z_min/Location -12.235/-53.1667°Lat -69.6°Lon
Z_max/Location -6.422/ -53.3°Lat -71.6667°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Thermal lithospheric thickness
Austral Basin location map
Statistics - Thermal lithospheric thickness
Median 106.955
Mean 105.030
Scale 4.451
stdev 4.920
Z_min/Location 95.000/-54.0°Lat -67.0°Lon
Z_max/Location 110.001/ -48.5667°Lat -70.6°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Heatflow
Austral Basin location map
Statistics - Heatflow
Median 83.029
Mean 83.239
Scale 1.829
stdev 1.486
Z_min/Location 79.885/-47.8°Lat -70.3°Lon
Z_max/Location 87.144/ -53.7°Lat -70.9333°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Topography (ETOPO2)
Austral Basin location map
Statistics - Topography (ETOPO2)
Median 154.000
Mean 209.535
Scale 240.181
stdev 280.529
Z_min/Location -547.000/-53.5°Lat -70.9333°Lon
Z_max/Location 2250.000/ -47.7°Lat -71.9°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Base hard sediments
Austral Basin location map
Statistics - Base hard sediments
Median -1.768
Mean -1.970
Scale 1.107
stdev 1.256
Z_min/Location -4.959/-51.8667°Lat -69.9°Lon
Z_max/Location 0.673/ -47.2333°Lat -71.5333°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Temperature at 50km depth
Austral Basin location map
Statistics - Temperature at 50km depth
Median 801.011
Mean 810.739
Scale 20.575
stdev 24.120
Z_min/Location 786.995/-48.7°Lat -70.5667°Lon
Z_max/Location 861.000/ -54.0°Lat -68.0°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Laske sediment thickness
Austral Basin location map
Statistics - Laske sediment thickness
Median 2.341
Mean 2.534
Scale 1.569
stdev 1.599
Z_min/Location -0.063/-54.0°Lat -69.2333°Lon
Z_max/Location 7.528/ -51.9333°Lat -70.9667°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Lithospheric temperature gradient
Austral Basin location map
Statistics - Lithospheric temperature gradient
Median 8.913
Mean 8.961
Scale 0.474
stdev 0.353
Z_min/Location 8.556/-48.0°Lat -71.0°Lon
Z_max/Location 9.757/ -53.0°Lat -70.0°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Computations

Isostatic correction
Austral Basin location map
Statistics - Isostatic correction
Median 0.960
Mean 1.007
Scale 0.607
stdev 0.590
Z_min/Location 0.000/-53.9667°Lat -69.4333°Lon
Z_max/Location 2.680/-51.9333°Lat -70.9667°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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TTS (sediment)
Austral Basin location map
Statistics - TTS (sediment)
Median 0.902
Mean 0.963
Scale 1.086
stdev 1.068
Z_min/Location -1.130/-51.8333°Lat -71.8°Lon
Z_max/Location 3.453/-51.6667°Lat -69.7°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Beta (Sediment)
Austral Basin location map
Statistics - Beta (Sediment)
Median 1.130
Mean 1.171
Scale 0.175
stdev 0.203
Z_min/Location 0.874/-51.8333°Lat -71.8°Lon
Z_max/Location 1.791/-51.6667°Lat -69.7°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Crustal vs lithosph. extn.
Austral Basin location map
Statistics - Crustal vs lithosph. extn.
Median 0.046
Mean 0.093
Scale 0.108
stdev 0.146
Z_min/Location -0.117/-53.9333°Lat -69.2°Lon
Z_max/Location 0.810/-53.3°Lat -71.6667°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Anomalous TTS
Austral Basin location map
Statistics - Anomalous TTS
Median 0.404
Mean 0.273
Scale 0.854
stdev 0.807
Z_min/Location -2.753/-53.3°Lat -71.6667°Lon
Z_max/Location 1.508/-50.4°Lat -69.7667°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Predicted elevation
Austral Basin location map
Statistics - Predicted elevation
Median 1188.710
Mean 1056.770
Scale 132.185
stdev 284.865
Z_min/Location -712.512/-53.3°Lat -71.6667°Lon
Z_max/Location 1422.900/-51.4667°Lat -72.0°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Beta (Crust)
Austral Basin location map
Statistics - Beta (Crust)
Median 1.062
Mean 1.113
Scale 0.096
stdev 0.144
Z_min/Location 0.927/-51.4667°Lat -72.0333°Lon
Z_max/Location 1.907/-53.3°Lat -71.6667°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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TTS (crust)
Austral Basin location map
Statistics - TTS (crust)
Median 0.454
Mean 0.689
Scale 0.686
stdev 0.811
Z_min/Location -0.613/-51.4667°Lat -72.0333°Lon
Z_max/Location 3.719/-53.3°Lat -71.6667°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Differential Beta
Austral Basin location map
Statistics - Differential Beta
Median 0.067
Mean 0.058
Scale 0.146
stdev 0.154
Z_min/Location -0.766/-53.3°Lat -71.6667°Lon
Z_max/Location 0.383/-51.2°Lat -69.6333°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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This basin data is based on interpolated global grids and might contain gridding errors or wrongly interpolated data values.

Page generated 2008-08-03 02:36:53 CEST | © Christian Heine, School of Geosciences, Sydney University, Australia