Igneous activity in the Bornu Basin, onshore NE Nigeria: implications for opening of the South Atlantic
The structure of igneous plumbing systems in circum-South Atlantic, intra-continental rift basins, e.g., the West and Central African Rift Systems (WCARS), remains enigmatic due to poor subsurface data coverage and quality. How magmatism in these basins related to the opening of the South Atlantic i...
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ftimperialcol:oai:spiral.imperial.ac.uk:10044/1/44897 2023-05-15T18:21:11+02:00 Igneous activity in the Bornu Basin, onshore NE Nigeria: implications for opening of the South Atlantic Suleiman, A Magee, C Jackson, CAL Fraser, A University of Utah 2017-01-19 http://hdl.handle.net/10044/1/44897 https://doi.org/10.1144/jgs2016-107 unknown Geological Society 10044/1/44170 http://hdl.handle.net/10044/1/44170 Journal of the Geological Society © 2017 The Author(s). Published by The Geological Society of London. All rights reserved. For permissions: http://www.geolsoc.org.uk/permissions. Publishing disclaimer: www.geolsoc.org.uk/pub_ethics 678 667 Science & Technology Physical Sciences Geosciences Multidisciplinary Geology UPPER BENUE TROUGH AFRICAN RIFT SYSTEM 3D SEISMIC DATA NORTHEASTERN NIGERIA SILL EMPLACEMENT CHAD BASIN CONTINENTAL MARGINS BOREHOLE DATA FORCED FOLDS INTRUSIONS 0403 Geology Journal Article 2017 ftimperialcol https://doi.org/10.1144/jgs2016-107 2018-09-16T05:58:32Z The structure of igneous plumbing systems in circum-South Atlantic, intra-continental rift basins, e.g., the West and Central African Rift Systems (WCARS), remains enigmatic due to poor subsurface data coverage and quality. How magmatism in these basins related to the opening of the South Atlantic is thus poorly understood. We integrate 2D and 3D seismic reflection data (c. 27600 km2), data from 23 boreholes, and field observations from the Bornu Basin and Upper Benue Trough, onshore NE Nigeria to examine the timing and development of igneous bodies possibly related to opening of the South Atlantic. We identify numerous sills, which typically have saucer- shaped and en-echelon morphologies,and extrusive volcanic cones. The igneous rocks are alkali basalts and dolerites. Seismic-stratigraphic relationships indicate that emplacement occurred in the Early Cretaceous (Albian-to-Cenomanian; ca. 120 Ma),Late Cretaceous (Santonian-to-early Campanian; ca. 83 Ma), and Cenozoic (Miocene; ca. 22 Ma). Magmatism was broadly coeval with major plate boundary interactions, characterized by major azimuthal changes in fracture zones in the developing South Atlantic Ocean. The broad temporal correlation between intra-continental rift basin magmatism and plate boundary interactions suggests that periods of magma emplacement may have, in some way, been instigated by stress dissipation into intra-continental rift basins. Article in Journal/Newspaper South Atlantic Ocean Imperial College London: Spiral Cones The ENVELOPE(78.344,78.344,-68.635,-68.635) Cones, The ENVELOPE(78.344,78.344,-68.635,-68.635) Journal of the Geological Society 174 4 667 678 |
institution |
Open Polar |
collection |
Imperial College London: Spiral |
op_collection_id |
ftimperialcol |
language |
unknown |
topic |
Science & Technology Physical Sciences Geosciences Multidisciplinary Geology UPPER BENUE TROUGH AFRICAN RIFT SYSTEM 3D SEISMIC DATA NORTHEASTERN NIGERIA SILL EMPLACEMENT CHAD BASIN CONTINENTAL MARGINS BOREHOLE DATA FORCED FOLDS INTRUSIONS 0403 Geology |
spellingShingle |
Science & Technology Physical Sciences Geosciences Multidisciplinary Geology UPPER BENUE TROUGH AFRICAN RIFT SYSTEM 3D SEISMIC DATA NORTHEASTERN NIGERIA SILL EMPLACEMENT CHAD BASIN CONTINENTAL MARGINS BOREHOLE DATA FORCED FOLDS INTRUSIONS 0403 Geology Suleiman, A Magee, C Jackson, CAL Fraser, A Igneous activity in the Bornu Basin, onshore NE Nigeria: implications for opening of the South Atlantic |
topic_facet |
Science & Technology Physical Sciences Geosciences Multidisciplinary Geology UPPER BENUE TROUGH AFRICAN RIFT SYSTEM 3D SEISMIC DATA NORTHEASTERN NIGERIA SILL EMPLACEMENT CHAD BASIN CONTINENTAL MARGINS BOREHOLE DATA FORCED FOLDS INTRUSIONS 0403 Geology |
description |
The structure of igneous plumbing systems in circum-South Atlantic, intra-continental rift basins, e.g., the West and Central African Rift Systems (WCARS), remains enigmatic due to poor subsurface data coverage and quality. How magmatism in these basins related to the opening of the South Atlantic is thus poorly understood. We integrate 2D and 3D seismic reflection data (c. 27600 km2), data from 23 boreholes, and field observations from the Bornu Basin and Upper Benue Trough, onshore NE Nigeria to examine the timing and development of igneous bodies possibly related to opening of the South Atlantic. We identify numerous sills, which typically have saucer- shaped and en-echelon morphologies,and extrusive volcanic cones. The igneous rocks are alkali basalts and dolerites. Seismic-stratigraphic relationships indicate that emplacement occurred in the Early Cretaceous (Albian-to-Cenomanian; ca. 120 Ma),Late Cretaceous (Santonian-to-early Campanian; ca. 83 Ma), and Cenozoic (Miocene; ca. 22 Ma). Magmatism was broadly coeval with major plate boundary interactions, characterized by major azimuthal changes in fracture zones in the developing South Atlantic Ocean. The broad temporal correlation between intra-continental rift basin magmatism and plate boundary interactions suggests that periods of magma emplacement may have, in some way, been instigated by stress dissipation into intra-continental rift basins. |
author2 |
University of Utah |
format |
Article in Journal/Newspaper |
author |
Suleiman, A Magee, C Jackson, CAL Fraser, A |
author_facet |
Suleiman, A Magee, C Jackson, CAL Fraser, A |
author_sort |
Suleiman, A |
title |
Igneous activity in the Bornu Basin, onshore NE Nigeria: implications for opening of the South Atlantic |
title_short |
Igneous activity in the Bornu Basin, onshore NE Nigeria: implications for opening of the South Atlantic |
title_full |
Igneous activity in the Bornu Basin, onshore NE Nigeria: implications for opening of the South Atlantic |
title_fullStr |
Igneous activity in the Bornu Basin, onshore NE Nigeria: implications for opening of the South Atlantic |
title_full_unstemmed |
Igneous activity in the Bornu Basin, onshore NE Nigeria: implications for opening of the South Atlantic |
title_sort |
igneous activity in the bornu basin, onshore ne nigeria: implications for opening of the south atlantic |
publisher |
Geological Society |
publishDate |
2017 |
url |
http://hdl.handle.net/10044/1/44897 https://doi.org/10.1144/jgs2016-107 |
long_lat |
ENVELOPE(78.344,78.344,-68.635,-68.635) ENVELOPE(78.344,78.344,-68.635,-68.635) |
geographic |
Cones The Cones, The |
geographic_facet |
Cones The Cones, The |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
678 667 |
op_relation |
10044/1/44170 http://hdl.handle.net/10044/1/44170 Journal of the Geological Society |
op_rights |
© 2017 The Author(s). Published by The Geological Society of London. All rights reserved. For permissions: http://www.geolsoc.org.uk/permissions. Publishing disclaimer: www.geolsoc.org.uk/pub_ethics |
op_doi |
https://doi.org/10.1144/jgs2016-107 |
container_title |
Journal of the Geological Society |
container_volume |
174 |
container_issue |
4 |
container_start_page |
667 |
op_container_end_page |
678 |
_version_ |
1766200321397227520 |