| Lithostratigraphy, Sedimentology, and Provenance of the Balfour Formation (Beaufort Group) in the Fort Beaufort–Alice Area, Eastern Cape Province, South Africa |
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| 作者姓名： | David KATEMAUNZANGA and Cornelis Janse GUNTER |
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| 作者单位： | 1 Council for Geoscience, Pretoria, South Africa; 2 Geology Department, University of Fort Hare, Alice, South Africa |
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| 基金项目： | The project was principally financially supported by the Govan Mbeki Research Centre (GMRC) at the University of Fort Hare and by the Council for Geoscience. |
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| 摘 要： | Abstract: The Balfour Formation has a pronounced lithological variation that is characterized by alternating sandstone- and mudstone-dominated members. The sandstone-dominated Oudeberg and Barberskrans Members are composed of lithofacies that range from intraformational conglomerates to fine-grained sediments, whereas the mudstone-dominated members (Daggaboersnek, Elandsberg, and Palingkloof) are dominated by the facies Fm and Fl. Petrography, geochemistry, and a paleocurrent analysis indicated that the source rock of the Balfour Formation was to south east and the rocks had a transitional/dissected magmatic arc signature. The sandstones-rich members were deposited by seasonal and ephemeral high-energy, low-sinuous streams, and the fine-grained-rich members were formed by ephemeral meandering streams. The paleoclimates have been equated to present temperate climates; they were semiarid becoming arid towards the top of the Balfour Formation. This has been determined by reconstructing the paleolatitude of the Karoo Basin, geochemistry, paleontology, sedimentary structures, and other rock properties, like color.
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| 关 键 词： | Key words: Balfour Formation Karoo Supergroup Beaufort Group lithostratigraphy sedimentology provenance Permo–Triassic |
| 收稿时间： | 2009/7/22 0:00:00 |
| 修稿时间： | 8/9/2009 12:00:00 AM |
Lithostratigraphy,Sedimentology,and Provenance of the Balfour Formation(Beaufort Group) in the Fort Beaufort-Alice Area,Eastern Cape Province,South Africa |
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| Authors: | David KATEMAUNZANGA Cornelis Janse GUNTER Council for Geoscience Pretoria South Africa Geology |
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| Institution: | [1]Council for Geoscience, Pretoria, South Africa [2]Geology Department, University of Fort Hare, Alice, South Africa |
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| Abstract: | The Balfour Formation has a pronounced lithological variation that is characterized by alternating sandstone- and mudstone-dominated members.The sandstone-dominated Oudeberg and Barberskrans Members are composed of lithofacies that range from intraformational conglomerates to fine-grained sediments,whereas the mudstone-dominated members(Daggaboersnek,Elandsberg,and Palingkloof) are dominated by the facies Fm and Fl.Petrography,geochemistry,and a paleocurrent analysis indicated that the source rock of the Ba... |
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| Keywords: | Balfour Formation Karoo Supergroup Beaufort Group lithostratigraphy sedimentology provenance Permo-Triassic |
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