Niels Henriksen, A.K. Higgins, Feiko Kalsbeek and T. Christopher R. Pulvertaft
Greenland's geological development spans a period of c. 4 Ga from the Eoarchaean to the Quaternary. An overview of the geology was presented in 1995 on a geological map at a scale of 1:2 500 000, followed by a descriptive text to the map printed in 2000 as Geology of Greenland Survey Bulletin 185.
Since the first edition of this work was published, large amounts of new data have been acquired, notably in the offshore regions, in relation to mineral prospecting and in connection with regional geological mapping projects. This 2nd edition aims at providing an updated overview of the geology of Greenland with reference to the enclosed geological map sheet from 1995 that in general terms is still valid.
This bulletin ( Geological Survey of Denmark and Greenland Bulletin 18) comprises descriptions of the Greenland Precambrian shield with its Archaean to Proterozoic crystalline complexes, the bordering Proterozoic and Palaeozoic sedimentary basins, Palaeozoic fold belts, late Palaeozoic–Mesozoic sedimentary basins, Palaeogene (lower Tertiary) volcanic rocks, and Quaternary deposits. Special chapters treat offshore geology, mineral deposits and petroleum potential.
The volume includes an extensive subject index, a place names register, a special legend explanation and an updated and expanded reference list that enables the reader to follow up on new data and details in agreement with modern interpretations.
Colophon, contents, abstract, preface, introduction
nr18_p001-013.pdf (pdf-file ~1 Mb)
Crystalline rocks older than 1600 Ma: the Greenland Precambrian shield
nr18_p014-032.pdf (pdf-file ~4.5 Mb)
Proterozoic to Phanerozoic geological development after formation of the Precambrian shield
nr18_p033-064.pdf (pdf-file ~6.2 Mb)
Glaciology, offshore geology
nr18_p064-077.pdf (pdf-file ~3.6 Mb)
Mineral deposits, acknowledgements
nr18_p078-091.pdf (pdf-file ~2.2 Mb)
References, legend explanation, place names register, index
nr18_p092-126.pdf (pdf-file ~0.2 Mb)
Download the entire Bulletin nr18_p001-126.pdf (pdf-file ~17.2 Mb)
Henriksen, N., Higgins, A.K., Kalsbeek, F. & Pulvertaft, T.C.R. 2009: Greenland from Archaean to Quaternary. Descriptive text to the 1995 Geological map of Greenland, 1:2 500 000. 2nd edition. Geological Survey of Denmark and Greenland Bulletin 18, 126 pp. + map.
The geological development of Greenland spans a period of nearly 4 Ga, from Eoarchaean to the Quaternary. Greenland is the largest island on Earth with a total area of 2 166 000 km2, but only c. 410 000 km2 are exposed bedrock, the remaining part being covered by a major ice sheet (the Inland Ice) reaching over 3 km in thickness. The adjacent offshore areas underlain by continental crust have an area of c. 825 000 km2.
Greenland is dominated by crystalline rocks of the Precambrian shield, which formed during a succession of Archaean and Palaeoproterozoic orogenic events and stabilised as a part of the Laurentian shield about 1600 Ma ago. The shield area can be divided into three distinct types of basement provinces: (1) Archaean rocks (3200–2600 Ma old, with local older units up to> 3800 Ma) that were almost unaffected by Proterozoic or later orogenic activity; (2) Archaean terrains reworked during the Palaeoproterozoic around 1900–1750 Ma ago; and (3) terrains mainly composed of juvenile Palaeoproterozoic rocks (2000–1750 Ma in age). Subsequent geological developments mainly took place along the margins of the shield. During the Proterozoic and throughout the Phanerozoic major sedimentary basins formed, notably in North and North-East Greenland, in which sedimentary successions locally reaching 18 km in thickness were deposited. Palaeozoic orogenic activity affected parts of these successions in the Ellesmerian fold belt of North Greenland and the East Greenland Caledonides; the latter also incorporates reworked Precambrian crystalline basement complexes.
Late Palaeozoic and Mesozoic sedimentary basins developed along the continent–ocean margins in North, East and West Greenland and are now preserved both onshore and offshore. Their development was closely related to continental break-up with formation of rift basins. Initial rifting in East Greenland in latest Devonian to earliest Carboniferous time and succeeding phases culminated with the opening of the North Atlantic Ocean in the late Paleocene. Sea-floor spreading was accompanied by extrusion of Palaeogene (early Tertiary) plateau basalts in both central West and central–southern East Greenland.
During the Quaternary Greenland was almost completely covered by ice, and the present day Inland Ice is a relic from the Pleistocene ice ages. Vast amounts of glacially eroded detritus were deposited on the continental shelves around Greenland.
Mineral exploitation in Greenland has so far encompassed cryolite, lead-zinc, gold, olivine and coal. Current prospecting activities in Greenland are concentrated on gold, base metals, platinum group elements, molybdenum, iron ore, diamonds and lead-zinc. Hydrocarbon potential is confined to the major Phanerozoic sedimentary basins, notably the large basins offshore North-East and West Greenland. While reserves of oil or gas have yet to be found, geophysical data combined with discoveries of oil seeps onshore have revealed a considerable potential for offshore oil and gas.
De Nationale Geologiske Undersøgelser for Danmark og Grønland, Øster Voldgade 10, 1350 København
Geological Survey of Denmark and Greenland Bulletin kan købes hos:
De Nationale Geologiske Undersøgelser for Danmark og Grønland
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