ICONS atlas: SAM - Chaco Basin

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Overview

This page bundles the available data for the Chaco 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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Chaco Basin location map
Basin name Chaco Basin
Region code SAM
Basin ID 2640
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.

Chaco Basin cross section
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Dynamic topography evolution for basin centroid
Chaco 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
Chaco Basin location map
Statistics - Mantle Lid thickness
Median 93.192
Mean 93.536
Scale 4.152
stdev 6.073
Z_min/Location 72.894/-23.8667°Lat -65.3333°Lon
Z_max/Location 104.015/ -21.0333°Lat -59.9333°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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Depth of 550 deg isotherm
Chaco Basin location map
Statistics - Depth of 550 deg isotherm
Median -40.123
Mean -40.516
Scale 0.198
stdev 0.653
Z_min/Location -42.000/-20.0°Lat -60.0°Lon
Z_max/Location -39.827/ -20.2°Lat -64.2667°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
Chaco Basin location map
Statistics - Mobil isopachs
Median 2.975
Mean 3.027
Scale 2.622
stdev 1.901
Z_min/Location -0.927/-23.8667°Lat -65.3333°Lon
Z_max/Location 8.239/ -17.0333°Lat -64.5°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
Chaco Basin location map
Statistics - Plain crustal thickness
Median 38.155
Mean 39.821
Scale 1.364
stdev 4.281
Z_min/Location 35.307/-21.7333°Lat -61.4667°Lon
Z_max/Location 58.397/ -23.8667°Lat -65.3333°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
Chaco Basin location map
Statistics - Base middle crust
Median -31.679
Mean -32.229
Scale 0.592
stdev 2.733
Z_min/Location -40.253/-22.1333°Lat -64.3333°Lon
Z_max/Location -28.254/ -19.3°Lat -63.6667°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
Chaco Basin location map
Statistics - Base lower crust
Median -40.676
Mean -41.258
Scale 0.551
stdev 3.483
Z_min/Location -56.046/-23.8667°Lat -65.3333°Lon
Z_max/Location -36.593/ -19.3°Lat -63.5333°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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Total crustal thickness
Chaco Basin location map
Statistics - Total crustal thickness
Median 41.000
Mean 42.304
Scale 0.459
stdev 3.879
Z_min/Location 38.692/-19.3333°Lat -63.4°Lon
Z_max/Location 59.293/ -23.8667°Lat -65.3333°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
Chaco Basin location map
Statistics - Base upper crust
Median -17.228
Mean -16.910
Scale 0.952
stdev 1.632
Z_min/Location -20.059/-22.1667°Lat -63.7667°Lon
Z_max/Location -12.818/ -19.2333°Lat -63.8667°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
Chaco Basin location map
Statistics - Thermal lithospheric thickness
Median 134.161
Mean 135.839
Scale 3.031
stdev 3.985
Z_min/Location 131.000/-18.0°Lat -62.0°Lon
Z_max/Location 145.015/ -21.0333°Lat -59.9333°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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Heatflow
Chaco Basin location map
Statistics - Heatflow
Median 72.725
Mean 71.114
Scale 5.389
stdev 5.557
Z_min/Location 56.570/-22.1667°Lat -64.0°Lon
Z_max/Location 78.589/ -20.1°Lat -60.0667°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)
Chaco Basin location map
Statistics - Topography (ETOPO2)
Median 312.000
Mean 486.770
Scale 164.569
stdev 452.140
Z_min/Location 77.000/-20.1333°Lat -58.2667°Lon
Z_max/Location 4165.000/ -23.0667°Lat -65.0667°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
Chaco Basin location map
Statistics - Base hard sediments
Median -1.734
Mean -1.438
Scale 2.020
stdev 1.884
Z_min/Location -4.979/-21.7333°Lat -61.5667°Lon
Z_max/Location 2.405/ -23.5333°Lat -65.2667°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
Chaco Basin location map
Statistics - Temperature at 50km depth
Median 693.991
Mean 688.994
Scale 9.084
stdev 12.091
Z_min/Location 660.000/-21.0°Lat -60.0°Lon
Z_max/Location 705.000/ -18.0°Lat -62.0°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
Chaco Basin location map
Statistics - Laske sediment thickness
Median 2.187
Mean 2.404
Scale 1.913
stdev 1.668
Z_min/Location -0.330/-20.8°Lat -64.3667°Lon
Z_max/Location 8.185/ -22.9667°Lat -63.9°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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Lithospheric temperature gradient
Chaco Basin location map
Statistics - Lithospheric temperature gradient
Median 7.165
Mean 7.133
Scale 0.182
stdev 0.163
Z_min/Location 6.745/-21.0333°Lat -59.9333°Lon
Z_max/Location 7.365/ -19.0°Lat -64.0°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
Chaco Basin location map
Statistics - Isostatic correction
Median 0.900
Mean 0.956
Scale 0.738
stdev 0.628
Z_min/Location 0.000/-17.2°Lat -64.9°Lon
Z_max/Location 2.858/-22.9667°Lat -63.9°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)
Chaco Basin location map
Statistics - TTS (sediment)
Median 0.754
Mean 0.481
Scale 1.553
stdev 1.485
Z_min/Location -2.461/-22.9667°Lat -64.2333°Lon
Z_max/Location 3.294/-21.5333°Lat -61.4°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)
Chaco Basin location map
Statistics - Beta (Sediment)
Median 1.107
Mean 1.111
Scale 0.248
stdev 0.229
Z_min/Location 0.761/-22.9667°Lat -64.2333°Lon
Z_max/Location 1.728/-21.5333°Lat -61.4°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.
Chaco Basin location map
Statistics - Crustal vs lithosph. extn.
Median 0.101
Mean 0.073
Scale 0.046
stdev 0.105
Z_min/Location -0.295/-23.8667°Lat -65.3333°Lon
Z_max/Location 0.244/-21.7333°Lat -61.2333°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
Chaco Basin location map
Statistics - Anomalous TTS
Median 0.365
Mean 0.164
Scale 0.891
stdev 1.117
Z_min/Location -2.661/-19.1°Lat -63.9°Lon
Z_max/Location 2.189/-21.2667°Lat -61.2°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
Chaco Basin location map
Statistics - Predicted elevation
Median 1297.320
Mean 1339.050
Scale 96.075
stdev 156.002
Z_min/Location 1133.170/-21.7667°Lat -61.0°Lon
Z_max/Location 1734.360/-21.7333°Lat -64.5667°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)
Chaco Basin location map
Statistics - Beta (Crust)
Median 1.088
Mean 1.052
Scale 0.039
stdev 0.094
Z_min/Location 0.711/-23.8667°Lat -65.3333°Lon
Z_max/Location 1.176/-21.7333°Lat -61.4667°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)
Chaco Basin location map
Statistics - TTS (crust)
Median 0.631
Mean 0.317
Scale 0.257
stdev 0.807
Z_min/Location -3.183/-23.8667°Lat -65.3333°Lon
Z_max/Location 1.168/-21.7333°Lat -61.4667°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
Chaco Basin location map
Statistics - Differential Beta
Median 0.048
Mean 0.058
Scale 0.151
stdev 0.181
Z_min/Location -0.279/-19.1667°Lat -63.8°Lon
Z_max/Location 0.559/-21.4°Lat -61.3°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