Igneous activity in the Bornu Basin, onshore NE Nigeria: implications for opening of the South Atlantic

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Title: Igneous activity in the Bornu Basin, onshore NE Nigeria: implications for opening of the South Atlantic
Author(s): Suleiman, A
Magee, C
Jackson, CAL
Fraser, A
Item Type: Journal Article
Abstract: 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.
Publication Date: 7-Mar-2017
Date of Acceptance: 19-Jan-2017
URI: http://hdl.handle.net/10044/1/44897
DOI: https://dx.doi.org/10.1144/jgs2016-107
ISSN: 0016-7649
Publisher: Geological Society
Start Page: 667
End Page: 678
Journal / Book Title: Journal of the Geological Society
Volume: 174
Replaces: 10044/1/44170
http://hdl.handle.net/10044/1/44170
Sponsor/Funder: University of Utah
Funder's Grant Number: EAPER_P48335
Copyright Statement: © 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
Keywords: 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
Geology
Publication Status: Published
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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