The crustal structure of Beira High, Central Mozambique
Up to Jurassic times the Antarctic and African continents were part of the supercontinent Gondwana. Since some 185 Ma the rifting in our research area caused the dispersal of Gondwana and Eastern Africa. The timing and geometry of the break-up as well as the amount of volcanism connected to the Jura...
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ftawi:oai:epic.awi.de:38558 2024-09-15T17:40:58+00:00 The crustal structure of Beira High, Central Mozambique Mueller, Christian Olaf Schreckenberger, Bernd Heyde, Ingo Jokat, Wilfried 2015-04-16 application/pdf https://epic.awi.de/id/eprint/38558/ https://epic.awi.de/id/eprint/38558/1/Abstract_EGU2015.pdf https://hdl.handle.net/10013/epic.45882 https://hdl.handle.net/10013/epic.45882.d001 unknown https://epic.awi.de/id/eprint/38558/1/Abstract_EGU2015.pdf https://hdl.handle.net/10013/epic.45882.d001 Mueller, C. O. , Schreckenberger, B. , Heyde, I. and Jokat, W. orcid:0000-0002-7793-5854 (2015) The crustal structure of Beira High, Central Mozambique , EGU General Assembly, Vienna, 13 April 2015 - 17 April 2015 . hdl:10013/epic.45882 EPIC3EGU General Assembly, Vienna, 2015-04-13-2015-04-17 Conference notRev 2015 ftawi 2024-06-24T04:12:21Z Up to Jurassic times the Antarctic and African continents were part of the supercontinent Gondwana. Since some 185 Ma the rifting in our research area caused the dispersal of Gondwana and Eastern Africa. The timing and geometry of the break-up as well as the amount of volcanism connected to the Jurassic rifting are still controversial. In the southern part of the Mozambique channel a prominent basement high, the Beira High, forms a specific crustal anomaly along the margin. It is still controversial if this high is a continental fragment or was formed during a period of enhanced magmatism. Therefore a deep seismic profile with 37 OBS/H was acquired from the deep Mozambique Channel, across the Beira High and terminating on the shelf. The main objectives are to provide constraints on the crustal composition and origin of the Beira High as well as the amount of volcanism and the continent-ocean transition below the Zambezi Delta. To obtain a P-wave velocity model of this area the data was forward modelled by means of 2D-Raytracing. Furthermore, potential field data acquired in parallel to the seismic data were used to calculate a 2D gravity model. Preliminary results indicate a 20-24 km thick crust for the Beira High. In good agreement to the adjacent oceanic crust in the Mozambique Channel the upper crust has velocities between 5.5-5.9 km/s. The middle crust is characterised by velocities between 6.2-6.7 km/s and the lower crust higher than 6.7 km/s and a density of 3.0 g/cm3. However, these velocities are only constrained by Moho reflections, since no diving waves are observed for the lower crust. In the area of the Zambezi Delta Depression the top of the acoustic basement is at 11.5 km depth and the crust thickness thins to 7 km. The basement here is overlain by a 2 km thick layer of 4.9-5.1 km/s, which we interpret as pre-rift sediments (Karoo-Belo-Group, including Lava Flows on top). Furthermore, evidence for the presence of a high velocity body (HVB) at below the western part of Beira High with a velocity of ... Conference Object Antarc* Antarctic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Up to Jurassic times the Antarctic and African continents were part of the supercontinent Gondwana. Since some 185 Ma the rifting in our research area caused the dispersal of Gondwana and Eastern Africa. The timing and geometry of the break-up as well as the amount of volcanism connected to the Jurassic rifting are still controversial. In the southern part of the Mozambique channel a prominent basement high, the Beira High, forms a specific crustal anomaly along the margin. It is still controversial if this high is a continental fragment or was formed during a period of enhanced magmatism. Therefore a deep seismic profile with 37 OBS/H was acquired from the deep Mozambique Channel, across the Beira High and terminating on the shelf. The main objectives are to provide constraints on the crustal composition and origin of the Beira High as well as the amount of volcanism and the continent-ocean transition below the Zambezi Delta. To obtain a P-wave velocity model of this area the data was forward modelled by means of 2D-Raytracing. Furthermore, potential field data acquired in parallel to the seismic data were used to calculate a 2D gravity model. Preliminary results indicate a 20-24 km thick crust for the Beira High. In good agreement to the adjacent oceanic crust in the Mozambique Channel the upper crust has velocities between 5.5-5.9 km/s. The middle crust is characterised by velocities between 6.2-6.7 km/s and the lower crust higher than 6.7 km/s and a density of 3.0 g/cm3. However, these velocities are only constrained by Moho reflections, since no diving waves are observed for the lower crust. In the area of the Zambezi Delta Depression the top of the acoustic basement is at 11.5 km depth and the crust thickness thins to 7 km. The basement here is overlain by a 2 km thick layer of 4.9-5.1 km/s, which we interpret as pre-rift sediments (Karoo-Belo-Group, including Lava Flows on top). Furthermore, evidence for the presence of a high velocity body (HVB) at below the western part of Beira High with a velocity of ... |
format |
Conference Object |
author |
Mueller, Christian Olaf Schreckenberger, Bernd Heyde, Ingo Jokat, Wilfried |
spellingShingle |
Mueller, Christian Olaf Schreckenberger, Bernd Heyde, Ingo Jokat, Wilfried The crustal structure of Beira High, Central Mozambique |
author_facet |
Mueller, Christian Olaf Schreckenberger, Bernd Heyde, Ingo Jokat, Wilfried |
author_sort |
Mueller, Christian Olaf |
title |
The crustal structure of Beira High, Central Mozambique |
title_short |
The crustal structure of Beira High, Central Mozambique |
title_full |
The crustal structure of Beira High, Central Mozambique |
title_fullStr |
The crustal structure of Beira High, Central Mozambique |
title_full_unstemmed |
The crustal structure of Beira High, Central Mozambique |
title_sort |
crustal structure of beira high, central mozambique |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/38558/ https://epic.awi.de/id/eprint/38558/1/Abstract_EGU2015.pdf https://hdl.handle.net/10013/epic.45882 https://hdl.handle.net/10013/epic.45882.d001 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
EPIC3EGU General Assembly, Vienna, 2015-04-13-2015-04-17 |
op_relation |
https://epic.awi.de/id/eprint/38558/1/Abstract_EGU2015.pdf https://hdl.handle.net/10013/epic.45882.d001 Mueller, C. O. , Schreckenberger, B. , Heyde, I. and Jokat, W. orcid:0000-0002-7793-5854 (2015) The crustal structure of Beira High, Central Mozambique , EGU General Assembly, Vienna, 13 April 2015 - 17 April 2015 . hdl:10013/epic.45882 |
_version_ |
1810487020594659328 |