geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

The tectonic significance of dikes of irregular fold-like shape


, : The tectonic significance of dikes of irregular fold-like shape. Geology 40(7): 579-582

The effects of postemplacement deformation on originally nonplanar dikes were tested experimentally and compared to field data from the Rainy Lake zone (Ontario, Canada) where irregular fold-like structures are observed. The analyses reveal that two processes are responsible for the irregular dike geometries. First, dikes intrude with varying orientations as they propagate across layers with rheology contrasts, thus developing nonplanar profiles. Second, with postemplacement ductile deformation, dikes that are more competent than the host rocks are folded and refracted in variable amounts, with the amount depending on the initial dike geometry, the heterogeneities in the host, and the regional strain. Deformed dikes and veins are often used as kinematic markers to evaluate regional tectonics, using methods that generally assume that veins had planar walls prior to deformation. The experimental results indicate that caution should be taken when using this approach, and they provide criteria to distinguish between intrusive and deformation structures in intensely deformed areas where distinction between the two is not readily apparent.

US$19.90

DOI: 10.1130/g32960.1


Other references

Johnston, P., 1986: DHSS suprised by nurses' attack on management. British Medical Journal 292(6515): 282-282

Hindmarsh, W.L., 1946: The application of artificial insemination in dairy herds in N.S.W. as affected by uterine disease. The experience gained in establishing an insemination service is described. Because many of the cows offered for insemination are infertile it is essential to provide a service for the treatment of sterility in conjunction with the insemination se...

Aoki, T.; Kazama, H.; Satoh, M.; Mizuki, K.; Watabe, H., 2005: A homogeneous assay for relative affinity of binding proteins using a green fluorescent protein tag and membrane disk. When the association between a ligand immobilized on a membrane disk and a fluorescence-labeled analyte was monitored with a fluorescent microplate reader, the time-dependent increase in fluorescence intensity of the reaction mixture was observed....

Thill, M.P.; Gérard, J.M.; Garin, P.; Offeciers, E., 2003: Belgian experience with the Vibrant Soundbridge prosthesis. The Belgian Experience with the Vibrant Soundbridge Prosthesis. The authors present the first results obtained with 13 patients implanted with the Vibrant Soundbridge, a semi-implantable electromagnetic hearing device. The first patient was implan...

Krishnan, H.; Hannon, M.F.; Bawa, S.M.; Talbot, D.; Mirza, D.; Manas, D.; Thick, M., 1998: Comparison of the efficacy of University of Wisconsin solution and Newcastle organ perfusion fluid in the preservation of livers for transplantation. University of Wisconsin solution (UW) is now used widely for the preservation of livers for transplantation. However, the use of commercial solutions has added considerably to the cost. We were able to produce a local version of organ perfusion fl...

Pandit, L.; Agrawal, A., 2006: Neuromuscular disorders in critical illness. Neuromuscular disorders in the background of critical illness are under diagnosed. Standardized screening for weakness in the intensive care unit (ICU) setting is uncommon and persistent weakness as a sequel of critical illness is usually not reco...

Mikhaylov N.P.; Semenov Y.L., 1976: Effusive and hypabyssal ultramafics of folded regions. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 4, Pages 428-437. 1976.

Hansen, H.C., 1926: The water-retaining power of the soil. A method is described of exposing filter paper saturated with sugar solution of known concentration and moist soil in the same closed air chamber of limited size. The paper is weighed before and after the exposure and from its gain or loss in weig...

Kurcik, D., 2004: In vitro tensometric measurements of the tensions caused by NiTi alloy springs with memory in metal tubes and human femurs. The aim of this paper is to quantify tangential and axial tensions that develop within metal tube and human femur after insertion of a NiTi alloy spring following the activation of memory shape effect. We can see that resulting tensions inside the...

Cannon, M., 1966: Further studies concerning end-group instability of soluble ribonucleic acid of Escherichla coli in vivo. During exponential growth of Escherichia coli. the adenoslne end group of soluble ribonucleic acid (sRNA) is unstable and exhibits a very slow turnover. This phenomenon has been further investigated in vivo under a variety of experimental conditio...