ICONS atlas: AFR - Anza Basin

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Overview

This page bundles the available data for the Anza Basin in the Africa. 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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Anza Basin location map
Basin name Anza Basin
Region code AFR
Basin ID 7550
No. of rings 1
Basin size [km²] 70413.7
Plate location/code /
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.

Anza Basin cross section
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Dynamic topography evolution for basin centroid
Anza 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
Anza Basin location map
Statistics - Mantle Lid thickness
Median 85.587
Mean 85.602
Scale 1.831
stdev 2.034
Z_min/Location 76.811/3.96667°Lat 36.6667°Lon
Z_max/Location 89.546/ 2.86667°Lat 38.6667°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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Depth of 550 deg isotherm
Anza Basin location map
Statistics - Depth of 550 deg isotherm
Median -37.295
Mean -37.226
Scale 0.368
stdev 0.546
Z_min/Location -38.000/3.0°Lat 38.0°Lon
Z_max/Location -34.491/ 3.96667°Lat 36.6667°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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Mobil isopachs
Anza Basin location map
Statistics - Mobil isopachs
Median 0.331
Mean 0.475
Scale 0.542
stdev 0.569
Z_min/Location -0.286/2.93333°Lat 38.5333°Lon
Z_max/Location 2.427/ 0.833333°Lat 40.4333°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
Anza Basin location map
Statistics - Plain crustal thickness
Median 32.394
Mean 32.470
Scale 1.099
stdev 0.977
Z_min/Location 30.919/4.1°Lat 37.1667°Lon
Z_max/Location 35.337/ 0.366667°Lat 38.8333°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
Anza Basin location map
Statistics - Base middle crust
Median -21.751
Mean -21.797
Scale 1.282
stdev 1.077
Z_min/Location -24.316/0.833333°Lat 40.4333°Lon
Z_max/Location -19.789/ 3.86667°Lat 37.6°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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Base lower crust
Anza Basin location map
Statistics - Base lower crust
Median -32.037
Mean -32.522
Scale 1.681
stdev 1.630
Z_min/Location -36.044/0.0°Lat 39.0333°Lon
Z_max/Location -30.407/ 4.06667°Lat 37.3333°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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Total crustal thickness
Anza Basin location map
Statistics - Total crustal thickness
Median 33.203
Mean 33.444
Scale 1.839
stdev 1.518
Z_min/Location 31.170/4.06667°Lat 37.3333°Lon
Z_max/Location 36.958/ 0.0°Lat 39.0333°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 upper crust
Anza Basin location map
Statistics - Base upper crust
Median -11.163
Mean -11.281
Scale 0.839
stdev 0.908
Z_min/Location -13.953/0.833333°Lat 40.4333°Lon
Z_max/Location -9.748/ 3.83333°Lat 37.6333°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
Anza Basin location map
Statistics - Thermal lithospheric thickness
Median 119.613
Mean 119.046
Scale 1.290
stdev 2.114
Z_min/Location 108.523/3.96667°Lat 36.6667°Lon
Z_max/Location 122.000/ 2.0°Lat 39.0°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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Heatflow
Anza Basin location map
Statistics - Heatflow
Median 74.165
Mean 75.717
Scale 1.522
stdev 3.165
Z_min/Location 71.036/0.833333°Lat 40.4333°Lon
Z_max/Location 85.410/ 3.96667°Lat 36.6667°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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Topography (ETOPO2)
Anza Basin location map
Statistics - Topography (ETOPO2)
Median 386.000
Mean 430.906
Scale 180.877
stdev 203.099
Z_min/Location 120.000/0.833333°Lat 40.4333°Lon
Z_max/Location 1807.000/ 2.76667°Lat 36.9333°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 hard sediments
Anza Basin location map
Statistics - Base hard sediments
Median 0.486
Mean -0.051
Scale 0.485
stdev 1.045
Z_min/Location -3.404/0.833333°Lat 40.4333°Lon
Z_max/Location 1.005/ 1.83333°Lat 37.6667°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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Temperature at 50km depth
Anza Basin location map
Statistics - Temperature at 50km depth
Median 745.097
Mean 748.920
Scale 4.579
stdev 11.976
Z_min/Location 737.000/2.0°Lat 39.0°Lon
Z_max/Location 816.565/ 3.96667°Lat 36.6667°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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Laske sediment thickness
Anza Basin location map
Statistics - Laske sediment thickness
Median 0.460
Mean 0.896
Scale 0.523
stdev 1.157
Z_min/Location -0.187/0.633333°Lat 38.7667°Lon
Z_max/Location 4.865/ 0.666667°Lat 40.2333°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
Anza Basin location map
Statistics - Lithospheric temperature gradient
Median 7.976
Mean 8.049
Scale 0.085
stdev 0.190
Z_min/Location 7.832/1.0°Lat 39.0°Lon
Z_max/Location 8.942/ 3.9°Lat 36.6333°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

Beta (Crust)
Anza Basin location map
Statistics - Beta (Crust)
Median 1.000
Mean 0.998
Scale 0.034
stdev 0.030
Z_min/Location 0.916/0.366667°Lat 38.8333°Lon
Z_max/Location 1.047/4.1°Lat 37.1667°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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Isostatic correction
Anza Basin location map
Statistics - Isostatic correction
Median 0.197
Mean 0.368
Scale 0.223
stdev 0.454
Z_min/Location 0.000/3.43333°Lat 38.0667°Lon
Z_max/Location 1.867/0.666667°Lat 40.2333°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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TTS (crust)
Anza Basin location map
Statistics - TTS (crust)
Median -0.003
Mean -0.021
Scale 0.265
stdev 0.236
Z_min/Location -0.713/0.366667°Lat 38.8333°Lon
Z_max/Location 0.354/4.1°Lat 37.1667°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)
Anza Basin location map
Statistics - TTS (sediment)
Median -0.641
Mean -0.317
Scale 0.341
stdev 0.668
Z_min/Location -1.242/2.46667°Lat 37.0333°Lon
Z_max/Location 1.591/0.833333°Lat 40.4333°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)
Anza Basin location map
Statistics - Beta (Sediment)
Median 0.924
Mean 0.968
Scale 0.037
stdev 0.086
Z_min/Location 0.863/2.46667°Lat 37.0333°Lon
Z_max/Location 1.255/0.833333°Lat 40.4333°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
Anza Basin location map
Statistics - Differential Beta
Median -0.093
Mean -0.030
Scale 0.032
stdev 0.102
Z_min/Location -0.128/4.06667°Lat 37.2667°Lon
Z_max/Location 0.243/0.833333°Lat 40.4333°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.
Anza Basin location map
Statistics - Crustal vs lithosph. extn.
Median -0.001
Mean -0.003
Scale 0.033
stdev 0.031
Z_min/Location -0.083/0.366667°Lat 38.8333°Lon
Z_max/Location 0.060/2.86667°Lat 38.6667°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
Anza Basin location map
Statistics - Anomalous TTS
Median -0.796
Mean -0.296
Scale 0.238
stdev 0.798
Z_min/Location -1.043/4.06667°Lat 37.2667°Lon
Z_max/Location 1.499/0.833333°Lat 40.4333°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
Anza Basin location map
Statistics - Predicted elevation
Median 985.117
Mean 993.151
Scale 157.979
stdev 129.881
Z_min/Location 766.647/3.13333°Lat 38.3333°Lon
Z_max/Location 1297.070/0.0°Lat 39.0333°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 2007-09-30 21:53:47 CEST | © Christian Heine, School of Geosciences, Sydney University, Australia