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Brooks, Charles Kent & Troels F. D. Nielsen
The Phanerozoic development of the Kangerdlugssuaq area, East Greenland

1982, 31 sider
Illustreret
19 x 26,5 cm
ISBN 978-87-635-1152-0
Serie: Monographs on Greenland | Meddelelser om Grønland, vol. 228
ISSN 0025-6676
Serie: Geoscience, vol. 9
ISSN 0106-1046



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This paper presents an up-to-date description of the state of knowledge on the post-Precambrian geology of the Kangerdlugssuaq area, which is a key area for the early stages of continental break-up in the North Atlantic. The area is analogous to present-day Iceland but differs from Iceland in that continental crust is present and the erosional level is deeper.

The area was affected by the Caledonian orogeny as revealed by the Batbjerg intrusion, which contains screens of Palaeozoic limestones and unique potassic rocks which relate it to the Assynt Province of Scotland.

Basin formation in the early Cretaceous heralded a period of sedimentation and volcanism which formed deposits several kilometres in thickness. The basalts are believed to have been extruded just prior to anomaly 24 (i.e. 55 -53 m.y. ago) which reaches the coast just north of this area. The basalts are overwhelmingly tholeiites of "plume" type and include picrites. They may be derived from two different mantle sources.

Layered gabbroic intrusions which are penecontemporaneous with the basalts are widespread in the area and a number of ultramafic plugs also occur. Syenites, both under-and oversaturated, are the most voluminous rock types of the area at the present erosional level and are somewhat later. The syenites show abundant signs of contamination with the country rocks.

The Gardiner complex is the eroded core of a nephelinitic volcano and contains melilite rocks and carbonatites. Related nephelinitic lavas are found in inland areas. In the area many dike swarms are recognized which vary from tholeiitic to strongly alkaline suites emplaced between ca. 55 and 35 m.y. ago and which give good evidence of the magmatic and chronological development of the area.

Tertiary tectonisnl includes three main elements: the well known coastal flexure, a major dome centred on Kangerdlugssuaq and regional plateau uplift.

 
Emneområde | Arktiske studier |
Emneord | Geologi |
Verdensdel m.v. | Grønland |
Sprog | Engelsk |

Indhold

Pressen skrev


Alle udgivelser af

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
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
Geomorphological observations at Kangerdlugssuaq, East Greenland
1979, ISBN 978-87-635-1129-2, hft
Geomorphological observations at Kangerdlugssuaq, East Greenland
1979, ISBN 978-87-635-1129-2, hft
 

Troels F. D. Nielsen som forfatter

The pre-basaltic sediments and the Lower Basalts at Kangerdlugssuaq, East Greenland: their stratigraphy, lithology, palaeomagnetism and petrology
1981, ISBN 978-87-635-1145-2, hft
The pre-basaltic sediments and the Lower Basalts at Kangerdlugssuaq, East Greenland: their stratigraphy, lithology, palaeomagnetism and petrology
1981, ISBN 978-87-635-1145-2, 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
 


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