Lithostratigraphy, Sedimentology, and Provenance of the Balfour Formation (Beauf

排行榜 收藏 打印 发给朋友 举报 来源: 《Acta Geologica Sinica》 发布者:cjk3d
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Lithostratigraphy, Sedimentology, and Provenance of the Balfour Formation (Beaufort Group) in the Fort Beaufort-Alice Area, Eastern Cape Province, South Africa

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 Fi. 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.水利论文.]_.U5Ab.P}M

作 者: David KATEMAUNZANGA Cornelis Janse GUNTER  
作者单位:David KATEMAUNZANGA(Council for Geoscience, Pretoria, South Africa)
:bS$`&r9BQD"F.c0Cornelis Janse GUNTER(Geology Department, University of Fort Hare, Alice, South Africa) 
刊 名:地质学报(英文版)  SCI
英文刊名:ACTA GEOLOGICA SINICA 
年,卷(期):2009 83(5) 
分类号:P5 
关键词:Balfour Formation   Karoo Supergroup   Beaufort Group   lithostratigraphy   sedimentology   provenance   Permo-Triassic  
机标关键词:AreaProvincestreamsmagmatic arcsource rockstructuresanalysiseast 
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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