Boginfo

  
 
Museum Tusculanums Forlag bruger cookies for at huske dine indstillinger. Ved at bruge sitet accepterer du dette. Accepter cookies
 
Nyhedsbrev   Print siden   

Brooks, Charles Kent
Geomorphological observations at Kangerdlugssuaq, East Greenland

1979, 24 s., hft.
Illustreret
19 x 26,5 cm
ISBN 978-87-635-1129-2
Serie: Monographs on Greenland | Meddelelser om Grønland, vol. 208
ISSN 0025-6676
Serie: Geoscience, vol. 1
ISSN 0106-1046



Vejl. pris50 DKK  8 $  7 €  6 £
Onlinepris40 DKK  6 $  5 €  5 £


Tegn abonnement
 Indholdsfortegnelse

▼ Din mening

The Kangerdlugssuaq area is mainly comprised of two contrasting rock groups: on the one hand the easily-eroded lavas and sediments of late Mesozoic to early Tertiary age and on the other the highly resistant Precambrian gneisses. Intermediate between these two types in terms of behaviour with respect to erosion are the Tertiary plutonic complexes and the basaltic areas along the coast which have been intruded by intense dyke swarms.

In the late Mesozoic the area was a peneplain, and low relief apparently persisted t~roughout the volcanic episode as there is good evidence that the lava plateau subsided during its formation. During this period ocean-floor spreading gave rise to the enlbryonic Danmark Strrede. Shortly after the volcanic episode the Kangerdlugssuaq area became the centre of a massive domal upwarping which has been a dominant feature of the land-forms up to the present day. The original surface of the dome has been reconstructed on the basis of topographic and geological evidence to show that it was elliptical in form with a major axis of at least 300 km in length and a height above present sea-level of about 6.5 km. However, subsequent isostatic effects are not considered in deriving these figures. The updonling is estimated to have occurred about 50 m.y. ago.

Several kilometres thickness of sediments and lavas were eroded off this dome at an early stage exposing the gneissic core, which still stands in alpine peaks up to about 2.7 km altitude in the central part, and dumping ca. 50000 km3 of sediment on the continental shelf. The erosion was effected by a radial, consequent drainage system, relicts of which can still be found. Kangerdlugssuaq itself may owe its origin to a tectonic line of weakness formed in response to doming, but there are also good arguments for its being purely erosional. The erosion of the dome was probably fluviatile but all trace of this stage has been obliterated by the subsequent glaciation. In the period between the Eocene and the early Miocene, possibly around 35 m.y. ago, the entire area underwent epeirogenic uplift raising the undeformed parts of the original lava plateau to around 2.5 km above sea-level. At present this plateau is undergoing dissection from the seaward side, but considerable areas are still preserved under thin, horizontal ice-caps.

A brief description of the various types of glaciers, an impermanent, ice-dammed lake and the areas of ice-free land is given. In the Pleistocene, the Kangerdlugssuaq glacier was considerably thicker than at the present time and extended far out over the shelf, excavating a deep channel here. Finally some observations on the coastlines are presented.

 
Emneområde | Arktiske studier |
Specifikt emneord | Geomorfologi |
Verdensdel m.v. | Grønland |
Sprog | Engelsk |

Indhold

Pressen skrev


Samtlige udgivelser på forlaget med -

Charles Kent Brooks som forfatter

Mineralogy of the Werner Bjerge alkaline complex, East Greenland
1982, ISBN 978-87-635-1148-3, hft
Mineralogy of the Werner Bjerge alkaline complex, East Greenland
1982, ISBN 978-87-635-1148-3, hft
The Phanerozoic development of the Kangerdlugssuaq area, East Greenland
1982, ISBN 978-87-635-1152-0, hft
The Phanerozoic development of the Kangerdlugssuaq area, East Greenland
1982, ISBN 978-87-635-1152-0, hft
Petrology of the coastal dykes at Tugtilik, southern East Greenland
1980, ISBN 978-87-635-1134-6, hft
Petrology of the coastal dykes at Tugtilik, southern East Greenland
1980, ISBN 978-87-635-1134-6, hft
 


Indlæg offentliggøres med navn og e-mail. Forlaget forbeholder sig ret til at redigere og udelade indlæg.




Museum Tusculanums ForlagRådhusvej 192920 Charlottenlund
Tlf. 3234 1414info@mtp.dk
CVR: 8876 8418

Bank: Danske Bank, 1092 København KBIC: DABADKKK
Reg.nr.: 1551Kontonr.: 000 5252 520IBAN: DK98 3000 000 5252520

www.mtp.dk er en e-mærket netbutik, og derfor har du altid adgang til e-mærkets gratis Forbrugerhotline, når du handler hos os.

©2004–2020 Museum Tusculanums Forlag. Alle rettigheder forbeholdes. Ved brug af dette site anerkender og accepterer du, at indholdet på dette site tilhører MTF eller tredjemand fra hvem MTF afleder sine rettigheder, samt at indholdet er ophavsretligt beskyttet og ikke må anvendes uden forudgående skriftlig samtykke fra MTF. Du anerkender og accepterer yderligere, at varemærker, kendetegn, varenavne, logoer og produkter vist på dette site, er beskyttet og ikke må anvendes uden forudgående skriftligt samtykke fra MTF.


Handelsbetingelser Juridiske betingelser Behandling af personlige oplysninger