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

Early Proterozoic collision tectonics, and rapakivi granites as intrusions in an extensional thrust-thickened crust; the Ketilidian Orogen, South Greenland


, : Early Proterozoic collision tectonics, and rapakivi granites as intrusions in an extensional thrust-thickened crust; the Ketilidian Orogen, South Greenland. Tectonophysics 195(1): 1-10

The Ketilidian orogen, that extends east-west across southern Greenland, formed in the period 1740–1850 Ma. In a north to south profile there are the following interpreted tectonic zones: a shelf-foredeep which has been thrust northwards to the foreland and back-folded and thrust southwards towards the suture, and which overlies Archean basement with Ketilidian granites with an appreciable crustal melt component; a suture with basaltic lavas, gabbros, shear belts, mylonites, copper and gold mineralisation; an Andean-type granitic batholith intruded into an island arc of volcanics, gneissose plutons and layered noritic gabbros; a steep back-arc shear belt of high-strain gneisses; and a flat-lying thrust stack of meta-supracrustals and paragneisses intruded by, largely crustal-melt, rapakivi granites. It is proposed that this profile is analagous to that from the Himalayas to Tibet, and that the rapakivi granites are equivalent to the Baltoro batholith in the Karakoram at the western uplifted end of the Tibetan plateau. Crustal thickening was achieved by thrusting, and ensuing thermal relaxation led to partial dehydration melting of deep continental crust. This provides a new model for the tectonic environment of rapakivi granites as intrusions in extensional zones within a collapsing thrust-thickened crust.

US$19.90

DOI: 10.1016/0040-1951(91)90140-n


Other references

Okabe, S.; Hirokawa, N., 1991: Actin dynamics in growth cones. The mechanism of actin incorporation and turnover in the nerve growth cone was examined by immunoelectron microscopy and low-light-level video microscopy of cultured neurons injected with biotin-labeled actin or fluorescently labeled actin. We fir...

Barthold, S.W.; Coleman, G.L.; Bhatt, P.N.; Osbaldiston, G.W.; Jonas, A.M., 1976: The etiology of transmissible murine colonic hyperplasia. Hyperplasia was produced in mice inoculated with unfiltered colonic suspension from affected mice, but infectivity was lost after passage through a 0.45 mu m filter. The aetiological agent was subsequently identified as a variant of Citrobacter fr...

Tanaka R.; Shimosaka K., 1982: Investigation of the stool frequency in bedridden elderly and its improvements by ingesting of bifidus yoghurt. An epidemiological investigation of the stool frequency was performed and the effect of ingesting commercially available bifidus yoghurt on bowel movements was studied in 57 elderly patients, with a mean age of 78 yr who were bedridden. Forty of t...

Narman, A., 1990: Pastoral peoples and the provision of educational facilities: a case study from Kenya. This paper maintains that a rational choice for any government must be either to accept the pastoralists lifestyle and allow a subsequent independent policy or give pastoralists an equal share in the national development. If the latter line is pur...

Kul'berg A.Y.; Shmeleva N.E.; Bartova L.M.; Duplishcheva A.P., 1971: Study of the biological activity of peptic fab 1 fragments of the homologous and autologous gamma g globulin. Byulleten' Eksperimental'noi Biologii i Meditsiny 71(7): 64-68

Teng, H-Long.; Luo, F-Long.; Tao, H-Yan.; Wang, C-Jiang., 2011: A facile Cu(I)/BINAP-catalyzed asymmetric approach to functionalized pyroglutamate derivatives bearing a unique quaternary stereogenic center. A direct and facile access to enantioenriched pyroglutamate derivatives bearing a unique quaternary stereogenic center has been developed via Cu(I)/BINAP-catalyzed tandem Michael addition-elimination of α-substituted aldimino esters with Morita-B...

Bansbach, W.A.; May, R.E.; Bogash, M., 1960: Hypotonic bladder associated with sickle cell trait. Journal of Urology 84: 470-471

Haller, U.; Wyss, P.; Schilling, J.; Gutzwiller, F., 1998: Quality assessment in gynecology and obstetrics projects and experience in Switzerland. The first steps in quality assessment of results of performance in gynecology and obstetrics were taken by the Swiss Association of the OB/GYN Clinics of the Swiss Society of Obstetrics and Gynecology in the 1980's. Currently, medical data of...

Anonymous, 1979: The program of long term care physicians: long term care, its content and delimiters towards other forms of medical care. Lakartidningen 76(16): 1491-1493

Francis, C.A.; Franz, J.R.; O'Connor, S.M.; Thelen, D.G., 2016: Gait variability in healthy old adults is more affected by a visual perturbation than by a cognitive or narrow step placement demand. Gait variability measures have been linked to fall risk in older adults. However, challenging walking tasks may be required to elucidate increases in variability that arise from subtle age-related changes in cognitive processing and sensorimotor f...