| Autor: |
M.S. Ameen, J.W. Cosgrove |
| Rok vydání: |
1990 |
| Předmět: |
|
| Zdroj: |
Proceedings of the Geologists' Association. 101:119-129 |
| ISSN: |
0016-7878 |
| DOI: |
10.1016/s0016-7878(08)80248-9 |
| Popis: |
Meso-fractures in the vicinity of theBallard fault which occurs in the steep limb of the Purbeck-Isle of Wight monocline southern England are used to settle a long standing controversy concerning the sense of movement on this fault and its age relative to the monocline. Two groups of meso-fractures are recognised, one which is systematically orientated with respect to the bedding and which occurs throughout the monocline and another which is restricted to the footwall of the fault. By considering these fractures and the recent developments in the understanding of the regional geology of the region, it is possible to argue that the Ballard fault is a ramp structure associated with a northward moving thrust which was subsequently folded as the Purbeck-Isle of Wight monocline amplified. Deflection of the local fractures and the bedding close to the fault indicate clearly that the latest movements on the fault were opposed to this thrusting and it is probable that this later movement occurred during the amplification of the monocline either in association with or as an alternative to bedding plane slip. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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