FOLD INTERFERENCE FROM SIMULTANEOUS SHORTENING IN DIFFERENT DIRECTIONS - THE CAPE FOLD BELT SYNTAXIS

被引：14

作者：

DEBEER, CH

机构：

[1] Department of Geology, University of Stellenbosch, Matieland, 7602

来源：

JOURNAL OF AFRICAN EARTH SCIENCES | 1995年 / 21卷 / 01期

关键词：

D O I：

10.1016/0899-5362(95)00084-7

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Cape Fold Belt syntaxis displays antitaxial bends on either side of a well-developed intermediate fold trend. Folds of the NW-trending and E-trending branches merge relatively smoothly with the NE-trending syntaxial folds. The general pattern of fold coalescence, arcuations and the presence of many smaller folds of divergent trends show strong similarities with patterns generated in experimental models simulating the shortening of a multilayer simultaneously in two perpendicular directions and at unlike magnitudes. Interference between structures formed in response to different shortening directions led to a distinct regional variation of fold trends in the Witteberg Group of the Ceres are. The special fold overprinting relationships at fold intersections in this area are interpreted in terms of bulk constrictional deformation. The structure of the syntaxis is probably the combined effect of the superpositioning of two roughly coeval, non-coaxial fold belts upon a much larger nonrotational are, initially formed by the molding of the orogen around the irregular shape of the craton.

引用

页码：157 / 169

页数：13

共 37 条

[1]

Cobbold, Gapais, Rosello, Partitioning of transpressive motions within a sigmoidal foldbelt: the Variscan Sierras Australes, Argentina, Journal Structural Geology, 13, pp. 743-758, (1991)

[2]

De Beer, Structure of the Cape Fold Belt in the Ceres Syntaxis, M.Sc. dissertation, (1989)

[3]

De Beer, Simultaneous folding in the western and southern branches of the Cape Fold Belt, South African Journal Geology, 93, pp. 583-591, (1990)

[4]

De Ruig, Mier, Stel, Interference of compressional and wrenching tectonics in the Alicante region, SE-Spain, Geologie Mijnbouw, 66, pp. 201-212, (1987)

[5]

De Villiers, A review of the Cape Orogeny, Annals University Stellenbosch, 22, pp. 183-208, (1944)

[6]

De Villiers, Die drie sintaksisse in die suidwestelike Kaapprovinsie, Tegnikon, 9, pp. 75-89, (1956)

[7]

Faill, Kink-band folding, Valley and Ridge Province, Pennsylvania, Bulletin Geological Society America, 84, pp. 1289-1314, (1973)

[8]

Fitch, Miller, Geochronological report FMK 3016, (1987)

[9]

Fitch, Miller, Geochronological report FMK 3085, (1991)

[10]

Flinn, On folding during three-dimensional progressive deformation, Quaterly Journal Geological Society London, 118, pp. 385-433, (1962)

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