Lithostratigraphy,Sedimentology,and Provenance of the Balfour Formation(Beaufort Group) in the Fort Beaufort-Alice Area,Eastern Cape Province,South Africa

被引：2

作者：

David KATEMAUNZANGA ^{[1
]}

Cornelis Janse GUNTER ^{[2
]}

机构：

[1] Council for Geoscience,Pretoria,South Africa

[2] Geology Department,University of Fort Hare,Alice,South Africa

来源：

ActaGeologicaSinica(EnglishEdition) | 2009年 / 83卷 / 05期

关键词：

Balfour Formation; Karoo Supergroup; Beaufort Group; lithostratigraphy; sedimentology; provenance; Permo-Triassic;

D O I：

暂无

中图分类号：

P618.13 [石油、天然气];

学科分类号：

0709 ; 081803 ;

摘要：

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.

引用

页码：902 / 916

页数：15

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