ICONS atlas: AFR - Marmarica Basin

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Overview

This page bundles the available data for the Marmarica 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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Marmarica Basin location map
Basin name Marmarica Basin
Region code AFR
Basin ID 7090
Plate location/code intra-cratonic/INC
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.

Marmarica Basin cross section
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Dynamic topography evolution for basin centroid
Marmarica 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
Marmarica Basin location map
Statistics - Mantle Lid thickness
Median 86.774
Mean 86.545
Scale 4.897
stdev 3.659
Z_min/Location 80.775/31.3667°Lat 23.0°Lon
Z_max/Location 92.625/ 30.8°Lat 26.4667°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
Marmarica Basin location map
Statistics - Depth of 550 deg isotherm
Median -37.999
Mean -37.987
Scale 0.011
stdev 0.051
Z_min/Location -38.158/32.4333°Lat 24.5667°Lon
Z_max/Location -37.730/ 32.2°Lat 25.5333°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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Mobil isopachs
Marmarica Basin location map
Statistics - Mobil isopachs
Median 4.777
Mean 5.473
Scale 1.041
stdev 1.667
Z_min/Location 3.945/29.6667°Lat 24.7°Lon
Z_max/Location 10.480/ 32.2°Lat 25.5333°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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Plain crustal thickness
Marmarica Basin location map
Statistics - Plain crustal thickness
Median 33.932
Mean 34.039
Scale 5.671
stdev 4.037
Z_min/Location 27.095/30.9°Lat 26.5333°Lon
Z_max/Location 40.132/ 31.2°Lat 23.1333°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
Marmarica Basin location map
Statistics - Base middle crust
Median -28.162
Mean -28.256
Scale 5.004
stdev 3.649
Z_min/Location -33.823/31.4°Lat 23.0°Lon
Z_max/Location -22.144/ 30.8667°Lat 26.5333°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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Base lower crust
Marmarica Basin location map
Statistics - Base lower crust
Median -37.206
Mean -37.341
Scale 5.039
stdev 3.707
Z_min/Location -43.051/31.4°Lat 23.0°Lon
Z_max/Location -31.038/ 30.8667°Lat 26.5333°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
Marmarica Basin location map
Statistics - Total crustal thickness
Median 37.362
Mean 37.511
Scale 5.037
stdev 3.720
Z_min/Location 31.186/30.8667°Lat 26.5333°Lon
Z_max/Location 43.270/ 31.4°Lat 23.0°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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Base upper crust
Marmarica Basin location map
Statistics - Base upper crust
Median -15.766
Mean -15.833
Scale 2.184
stdev 1.646
Z_min/Location -18.515/31.6°Lat 22.9°Lon
Z_max/Location -13.154/ 30.0°Lat 26.5333°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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Thermal lithospheric thickness
Marmarica Basin location map
Statistics - Thermal lithospheric thickness
Median 123.997
Mean 124.056
Scale 0.070
stdev 0.293
Z_min/Location 123.579/31.6333°Lat 25.8°Lon
Z_max/Location 126.171/ 32.5333°Lat 24.7°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
Marmarica Basin location map
Statistics - Heatflow
Median 58.766
Mean 59.256
Scale 2.111
stdev 1.933
Z_min/Location 56.078/31.3667°Lat 26.0°Lon
Z_max/Location 63.747/ 31.9333°Lat 23.9667°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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Topography (ETOPO2)
Marmarica Basin location map
Statistics - Topography (ETOPO2)
Median 169.000
Mean 57.474
Scale 42.995
stdev 372.728
Z_min/Location -2385.000/32.1667°Lat 25.5333°Lon
Z_max/Location 242.000/ 30.7667°Lat 25.6667°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 hard sediments
Marmarica Basin location map
Statistics - Base hard sediments
Median -3.270
Mean -3.302
Scale 0.651
stdev 0.654
Z_min/Location -5.459/32.5333°Lat 24.7333°Lon
Z_max/Location -2.117/ 30.4°Lat 24.1°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
Marmarica Basin location map
Statistics - Temperature at 50km depth
Median 730.218
Mean 731.324
Scale 0.359
stdev 2.519
Z_min/Location 729.398/32.0°Lat 22.9°Lon
Z_max/Location 745.784/ 32.2°Lat 25.5333°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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Laske sediment thickness
Marmarica Basin location map
Statistics - Laske sediment thickness
Median 3.992
Mean 4.178
Scale 0.638
stdev 0.705
Z_min/Location 2.886/30.3667°Lat 24.1667°Lon
Z_max/Location 6.305/ 32.4333°Lat 25.0°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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Lithospheric temperature gradient
Marmarica Basin location map
Statistics - Lithospheric temperature gradient
Median 7.710
Mean 7.719
Scale 0.007
stdev 0.026
Z_min/Location 7.672/31.9333°Lat 23.4333°Lon
Z_max/Location 7.867/ 32.2°Lat 25.5333°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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Computations

Isostatic correction
Marmarica Basin location map
Statistics - Isostatic correction
Median 1.568
Mean 1.628
Scale 0.225
stdev 0.241
Z_min/Location 1.167/30.3667°Lat 24.1667°Lon
Z_max/Location 2.325/32.4333°Lat 25.0°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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TTS (sediment)
Marmarica Basin location map
Statistics - TTS (sediment)
Median 1.680
Mean 1.675
Scale 0.428
stdev 0.425
Z_min/Location 0.948/30.4333°Lat 24.0333°Lon
Z_max/Location 3.180/32.5333°Lat 24.7333°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)
Marmarica Basin location map
Statistics - Beta (Sediment)
Median 1.274
Mean 1.279
Scale 0.089
stdev 0.093
Z_min/Location 1.138/30.4333°Lat 24.0333°Lon
Z_max/Location 1.685/32.5333°Lat 24.7333°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.
Marmarica Basin location map
Statistics - Crustal vs lithosph. extn.
Median 0.008
Mean 0.019
Scale 0.168
stdev 0.122
Z_min/Location -0.148/31.2°Lat 23.1333°Lon
Z_max/Location 0.260/30.9°Lat 26.5333°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
Marmarica Basin location map
Statistics - Anomalous TTS
Median 1.607
Mean 1.642
Scale 0.988
stdev 0.751
Z_min/Location 0.448/30.7667°Lat 26.3667°Lon
Z_max/Location 3.078/32.0°Lat 22.9333°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
Marmarica Basin location map
Statistics - Predicted elevation
Median 1249.710
Mean 1230.060
Scale 371.512
stdev 277.219
Z_min/Location 700.153/30.8667°Lat 26.5333°Lon
Z_max/Location 1613.330/31.4°Lat 23.0°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)
Marmarica Basin location map
Statistics - Beta (Crust)
Median 1.007
Mean 1.019
Scale 0.169
stdev 0.122
Z_min/Location 0.852/31.2°Lat 23.1333°Lon
Z_max/Location 1.262/30.9°Lat 26.5333°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)
Marmarica Basin location map
Statistics - TTS (crust)
Median 0.058
Mean 0.033
Scale 1.297
stdev 0.924
Z_min/Location -1.361/31.2°Lat 23.1333°Lon
Z_max/Location 1.621/30.9°Lat 26.5333°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
Marmarica Basin location map
Statistics - Differential Beta
Median 0.259
Mean 0.260
Scale 0.126
stdev 0.103
Z_min/Location 0.096/30.7333°Lat 26.3°Lon
Z_max/Location 0.559/32.5333°Lat 24.7°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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This basin data is based on interpolated global grids and might contain gridding errors or wrongly interpolated data values.

Page generated 2008-08-03 02:36:30 CEST | © Christian Heine, School of Geosciences, Sydney University, Australia