Regional aeromagnetic and stratigraphic correlations of the Kalahari Copperbelt in Namibia and Botswana.
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| Title: | Regional aeromagnetic and stratigraphic correlations of the Kalahari Copperbelt in Namibia and Botswana. |
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| Authors: | Lehmann, Jérémie1 jerelehmann@gmail.com, Master, Sharad1, Rankin, William1, Milani, Lorenzo1, Kinnaird, Judith A.1, Naydenov, Kalin V.1,2, Saalmann, Kerstin1,3, Kumar, Manish4 |
| Source: | Ore Geology Reviews. Dec2015, Vol. 71, p169-190. 22p. |
| Subjects: | Geomagnetic maps, Tangential force, Igneous provinces, Water depth |
| Geographic Terms: | Namibia |
| Abstract: | The late Mesoproterozoic to Neoproterozoic Kalahari Copperbelt (KCB) in Namibia and Botswana is widely covered by Kalahari sand, which precludes direct correlations between known stratabound sediment-hosted Cu–Ag districts. We use a combination of review of literature data, and newly processed and interpreted high-resolution aeromagnetic maps in both countries to provide a new correlative cross-border interpretation. Lithostratigraphic control on the aeromagnetic response allows detailed indirect mapping of the Kalahari Copperbelt lithotectonic domains below the sand cover. This enabled us to redefine the width and lateral extent of the KCB as two continuous magnetic domains (the Rehoboth and Ghanzi–Chobe domains) extending from central Namibia to northern Botswana, and helped in resolving problems of stratigraphic correlations across the international border. The Rehoboth magnetic domain, in the western part of the KCB in Namibia, records continental arc magmatism at ~ 1200 Ma during orogenic events along the northwestern edge of the Kalahari Craton. This was followed at 1110–1090 Ma by widespread magmatism, identified within the entire KCB, and related to the 1112–1106 Ma Umkondo Large Igneous Province. The basal parts of the Tsumis Group in Namibia and Ghanzi Group in Botswana were deposited in shallow-water environments after a period of erosion and peneplanation. Subsequently, and prior to the Sturtian glaciation, the host-rocks of the Cu–Ag deposits formed by the deposition of chemically reduced shales and siltstones that formed in deeper water and overlie chemically oxidised shallow-water sandstones. This regional interface, which is both a permeability barrier and redox boundary, played a critical role in the formation of the stratabound sediment-hosted Cu–Ag deposits of the Kalahari Copperbelt, and the interface, with its strong magnetic contrast, can be followed through the entire Ghanzi–Chobe magnetic domain of the copperbelt. The whole KCB was affected by the Damara Orogeny during early Cambrian times, which resulted in the formation of a NE–SW trending ~ 250 km-wide fold-and-thrust belt. [ABSTRACT FROM AUTHOR] |
| Copyright of Ore Geology Reviews is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 108823667 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Regional aeromagnetic and stratigraphic correlations of the Kalahari Copperbelt in Namibia and Botswana. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Lehmann%2C+Jérémie%22">Lehmann, Jérémie</searchLink><relatesTo>1</relatesTo><i> jerelehmann@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Master%2C+Sharad%22">Master, Sharad</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Rankin%2C+William%22">Rankin, William</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Milani%2C+Lorenzo%22">Milani, Lorenzo</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kinnaird%2C+Judith+A%2E%22">Kinnaird, Judith A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Naydenov%2C+Kalin+V%2E%22">Naydenov, Kalin V.</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Saalmann%2C+Kerstin%22">Saalmann, Kerstin</searchLink><relatesTo>1,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Kumar%2C+Manish%22">Kumar, Manish</searchLink><relatesTo>4</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Ore+Geology+Reviews%22">Ore Geology Reviews</searchLink>. Dec2015, Vol. 71, p169-190. 22p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Geomagnetic+maps%22">Geomagnetic maps</searchLink><br /><searchLink fieldCode="DE" term="%22Tangential+force%22">Tangential force</searchLink><br /><searchLink fieldCode="DE" term="%22Igneous+provinces%22">Igneous provinces</searchLink><br /><searchLink fieldCode="DE" term="%22Water+depth%22">Water depth</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Namibia%22">Namibia</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The late Mesoproterozoic to Neoproterozoic Kalahari Copperbelt (KCB) in Namibia and Botswana is widely covered by Kalahari sand, which precludes direct correlations between known stratabound sediment-hosted Cu–Ag districts. We use a combination of review of literature data, and newly processed and interpreted high-resolution aeromagnetic maps in both countries to provide a new correlative cross-border interpretation. Lithostratigraphic control on the aeromagnetic response allows detailed indirect mapping of the Kalahari Copperbelt lithotectonic domains below the sand cover. This enabled us to redefine the width and lateral extent of the KCB as two continuous magnetic domains (the Rehoboth and Ghanzi–Chobe domains) extending from central Namibia to northern Botswana, and helped in resolving problems of stratigraphic correlations across the international border. The Rehoboth magnetic domain, in the western part of the KCB in Namibia, records continental arc magmatism at ~ 1200 Ma during orogenic events along the northwestern edge of the Kalahari Craton. This was followed at 1110–1090 Ma by widespread magmatism, identified within the entire KCB, and related to the 1112–1106 Ma Umkondo Large Igneous Province. The basal parts of the Tsumis Group in Namibia and Ghanzi Group in Botswana were deposited in shallow-water environments after a period of erosion and peneplanation. Subsequently, and prior to the Sturtian glaciation, the host-rocks of the Cu–Ag deposits formed by the deposition of chemically reduced shales and siltstones that formed in deeper water and overlie chemically oxidised shallow-water sandstones. This regional interface, which is both a permeability barrier and redox boundary, played a critical role in the formation of the stratabound sediment-hosted Cu–Ag deposits of the Kalahari Copperbelt, and the interface, with its strong magnetic contrast, can be followed through the entire Ghanzi–Chobe magnetic domain of the copperbelt. The whole KCB was affected by the Damara Orogeny during early Cambrian times, which resulted in the formation of a NE–SW trending ~ 250 km-wide fold-and-thrust belt. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Ore Geology Reviews is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.oregeorev.2015.05.009 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 22 StartPage: 169 Subjects: – SubjectFull: Geomagnetic maps Type: general – SubjectFull: Tangential force Type: general – SubjectFull: Igneous provinces Type: general – SubjectFull: Water depth Type: general – SubjectFull: Namibia Type: general Titles: – TitleFull: Regional aeromagnetic and stratigraphic correlations of the Kalahari Copperbelt in Namibia and Botswana. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Lehmann, Jérémie – PersonEntity: Name: NameFull: Master, Sharad – PersonEntity: Name: NameFull: Rankin, William – PersonEntity: Name: NameFull: Milani, Lorenzo – PersonEntity: Name: NameFull: Kinnaird, Judith A. – PersonEntity: Name: NameFull: Naydenov, Kalin V. – PersonEntity: Name: NameFull: Saalmann, Kerstin – PersonEntity: Name: NameFull: Kumar, Manish IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2015 Type: published Y: 2015 Identifiers: – Type: issn-print Value: 01691368 Numbering: – Type: volume Value: 71 Titles: – TitleFull: Ore Geology Reviews Type: main |
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