Major southeast-directed Caledonian thrusting and folding in the Dalradian rocks of mid-Ulster: implications for Caledonian tectonics and mid-crustal shear zones
Article Abstract:
The southeast facing gently sloping F1 anticline was regarded as the controlling factor in the stratigraphy of Dalradian rocks in mid-Ulster, Ireland. Remapping of the area has shown that stratigraphic configuration in the area was in an upward succession. The same stratigraphic units were found in the isoclinal Sperrin Nappe, a D2 structure, and it was shown to be responsible for a reversal in rock-age sequencing over a very large area. Radiometric dating of rocks indicated a pre-Caledonian, pre-Cambrian occurrence of the nappe forming events; evidences from studies in Ireland showed a major Caledonian deformation which was considered to be related to a southeast directed thrusting.
Publication Name: Geological Magazine
Subject: Earth sciences
ISSN: 0016-7568
Year: 1993
User Contributions:
Comment about this article or add new information about this topic:
Stike-slip tectonics and granite petrogenesis
Article Abstract:
Granite genesis via transpression is examined in the Hercynian shear zones of Iberia and in the northern British Caledonides. Crustal thickening with hydrous fluxing in the former generated syntectonic granites. Melt at the lower limits of crustal transpressional faults resulted in granitoid formation in the latter. Granitic melt may occur in obliquely convergent orogens. Granitoid genesis may also be caused in individual transcurrent shear zones.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1992
User Contributions:
Comment about this article or add new information about this topic:
Field examples of strike-slip fault terminations in Mongolia and their tectonic significance
Article Abstract:
Some large strike-slip faults seem to end against undeforming regions, and others end in regions of diffuse deformation with different structural style. The structures where strike-slip faults end or interact in two areas of Mongolia have been examined. A particular pattern is observed, comprising thrust faulting on one side, and a displacement with distance from the fault. This allows the style of faulting to change dramatically.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Mixed Caledonian appinite magmas: implications for lamprophyre fractionation and high Ba-Sr granite genesis. The relationship between E- and N-type magmas in the Baffin Bay lavas
- Abstracts: Fluid composition and evolution in coesite-bearing rocks (Dora-Maira massif, Western Alps): implications for element recycling during subduction
- Abstracts: Early Jurassic deformation in the Pine Forest Range, northwest Nevada, and implications for Cordilleran tectonics
- Abstracts: Dip domain method applied to the Mesozoic Connecticut Valley rift basins. Structural variety and tectonic evolution of strike-slip basins related to the Philippine fault system, northern Luzon, Philippines
- Abstracts: Supracrustal intraplate thickening of Variscan basement due to Alpine foreland compression: results from the superdeep well KTB (Bohemian Massif, Germany)