Główna sudecka dyslokacja diagonalna i jej znaczenie dla stanowiska synklinoriów waryscjsko-laramijskich

Józef Oberc

Abstract


MAIN SUDETIC DIAGONAL DISLOCATION AND ITS SIGNIFICANCE FOR POSITION OF THE VARISCIAN-LARAMIDE SYNCLINORIUMS

The main Sudetic diagonal dislocation consists of three -sectors.

1. The so-called main Sudetic fault, defined by G. Berg (1912) separates the older Kaczawa Palaeozoic from the crystalline basement Karkonosze - Izerskie Mts. The zigzag-like course of this boundary, observed at places, is caused by two factors: a - flat overthrust of the Kaczawa Palaezoic upon the crystalline basement of the Izerskie Mts., connected with folding of both complexes; b - cutting of the in this way formed structure by a steep dislocation of gravitational type; this dislocation is younger than the granite of the Karkonosze Mts., prolbably of Asturian age.

2. The fault zone Głuszyca - Podlesie separates the Upper Carboniferous of the intra-Sudetic synclinoriuan from the Archaeozoic gneisses of the Sowie Mts. In the vicinity of Sakolec the gneisses are overlain by the Culam deposits. Here, along the dislocation the ·sheets of gneisses appear. The discussed fault of the Asturian age appeared on the Proterozoic dislocation zone at that time when the margin of the gneisses underwent mylonitization.

3. A sector connecting the two above mentioned dislocations between Ciechanowice and Głuszyca, separates two different units of the intra-sudetic synclinorium from the Wałbrzych synclinorium. This latter shows an intense tectonics, partly of intrusive character. It consits of known structural elements, i.e. Jabłonów anticline, Gorce syncline, Chełmiec cupola (Upper Westfalian porphyries), Sobięcin syncline and Biały Kamień zone. This latter, being in lesser degree secondarily dislocated, forms here a marginal area of the Wałbrzych synclinorium. The Gorce syncline surrounds the Chełmiec cupola from the north and prolongs, passing into the Sobięcin Syncline. The axes of the units mentioned above run at various angles towards the Ciechanowice - Głuszyca dislocation. Along the Głuszyca - Sędzisław line this dislocation is found on a deep-seated edge of the block of the Sowie Mts. gneisses underlying the Wałbrzych synclinorium. The western part of the dislocation is connected with a violent extinction of the abrupt flexural slope of the eastern Karkonosze Mts. The origin of the flexure under discusion seems to be connected with the Asturian movements.

Of this elaboration the following conclusions may be drawn.

a) In relation to the course of Sudetes the dislocation is a diagonal one. At its eastern part the dislocation is about 4 km distant from the mountain margin, at its western end, as much as 37 km.

b) The foundations of this, generally speaking, Asturian dislocation are poly-genetic, different at various sectors.

c) On the whole, the main Sudetic diagonal dislocation is a hinge fault. Its middle part should be regarded as a zone of rotation. The proper axis of rotation (contrary one for both limbs) runs west of Jabłów in a NNE - SSW direction.

d) The dislocation is of great significance to preseve the Variscian-Laramide synclinorium, i.e. the intra-Sudetic synclinorium, the small part of which passes across the dislocation, and the North-Srudetic syndinorium. In the area of rotation axis both synclinoriums crop to the air at the both sides of the dislocation, evidently in the opposite directions. During the sedimentary period the series of both sornclinoriums joined to each other through the dislocation in the region of rotation axis. The problem of the original extension of the formations filling up the synclinoriums has not been considered in the present paper.


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