Geochemical exploration in central and western North Greenland

Rapport Grønlands Geologiske Undersøgelse ◽

10.34194/rapggu.v133.7981 ◽

1987 ◽

Vol 133 ◽

pp. 113-121

Author(s):

U.H Jakobsen ◽

H Stendal

Keyword(s):

Stream Sediment ◽

Geochemical Exploration ◽

Sediment Samples ◽

Lithostratigraphic Units ◽

Field Season ◽

Good For ◽

North Greenland

The 1985 geochemical exploration programme in central and western North Greenland completed the present geochemical exploration programme. A total of 424 stream sediment samples were collected during the 1985 field season. The reproducibility of drainage sampling is reasonably good for the elements Ba and Zn. Follow-up of anomalous Ba and Zn values from drainage samples collected in 1984 has not revealed any new mineralised localities. The high contents of Ba and Zn are interpreted as associated with: (1) pyrite-bearing strata, and/or (2) carbonate conglomerate, and/or (3) a higher general content of these elements in some lithostratigraphic units. A known zinc mineralisation in Navarana Fjord, eastern Freuchen Land, contains baryte in addition to sphalerite.

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Stream sediment sampling in the Atâ area, central West Greenland

Rapport Grønlands Geologiske Undersøgelse ◽

10.34194/rapggu.v140.8026 ◽

1988 ◽

Vol 140 ◽

pp. 24-26

Author(s):

P.W.U Appel ◽

C Knudsen

Keyword(s):

Close Correlation ◽

Stream Sediments ◽

Stream Sediment ◽

Amphibolite Facies ◽

Gold Content ◽

Sediment Samples ◽

Sediment Sampling ◽

Gneiss Granite ◽

Field Season ◽

Granite Complex

In 1982 scheelite was identified in stream sediments in the: Nuuk/Godthåb area, about 600 km south of Atâ. Subsequentlya regional stream-sediment programme was carried out in the Nuuk area from 1982 to 1987 as a result of which scheelite was found to be quite abundant in the 3800 m.y. old Isukasia supracrustalrocks as well as in the 3300 to 3000 m.y. old Malene supracrustal sequence (Appel, 1988). It was also recognised that there is a close correlation between the number of scheelite grains and the gold content of the heavy mineral concentrates in the Nuuk area (Appel, 1988). In the Ata area (fig. 1) extensive outcrops of supracrustal rocks are found. In these supracrustals, which have been metamorphosed to greenschist and amphibolite facies, abundant sulphide-rich horizons are found, as well as sulphide-bearing breccia zones with appreciable gold contents (Knudsen et al., 1988). During the 1987 field season geological reconnaissance mapping was carried out in two of the supracrustal areas and the gneiss-granite complex enclosing the supracrustal rocks ·was investigated (Knudsen et al., 1988). A limited programme of stream-sediment sampling was carried out in the Atâ area, where stream sediment samples were collected in all the main streams draining the supracrustal rocks.

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Preliminary analysis of the hydrocarbon source rock potential of central and western North Greenland

Rapport Grønlands Geologiske Undersøgelse ◽

10.34194/rapggu.v126.7918 ◽

1985 ◽

Vol 126 ◽

pp. 117-128

Author(s):

F.G Christiansen ◽

H Nøhr-Hansen ◽

F Rolle ◽

P Wrang

Keyword(s):

Source Rocks ◽

Hydrocarbon Source Rock ◽

North East ◽

The North ◽

South West ◽

Oil Generation ◽

Lithostratigraphic Units ◽

Field Season ◽

Rock Eval ◽

North Greenland

During the 1984 field season potential hydrocarbon source rocks were studied in central and western North Greenland. Samples from most lithostratigraphic units were collected from Freuchen Land in the north-east to Washington Land in the south-west. Preliminary results from LECO, Rock-Eval and palynofacies analyses suggest that some intervals in the Cambrian shelf sequence and in the Ordovician and Silurian trough sequence have enough organic matter to qualify as source rocks. Most of the trough sequence is, however, thermally postrnature with respect to oil generation and only the Cambrian Brønlund Fjord Group is expected to have been the source of the oil accumulations in the subsurface.

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Source rock investigations and shallow core drilling in central and western North Greenland

Rapport Grønlands Geologiske Undersøgelse ◽

10.34194/rapggu.v130.7936 ◽

1986 ◽

Vol 130 ◽

pp. 17-23

Author(s):

F.G Christiansen ◽

O Nykjær ◽

H Nøhr-Hansen

Keyword(s):

Source Rock ◽

Field Work ◽

Geological Mapping ◽

Source Rocks ◽

Hydrocarbon Generation ◽

Fully Integrated ◽

Rock Quality ◽

Lithostratigraphic Units ◽

Field Season ◽

North Greenland

The aim of project 'Nordolie' (Christiansen & Rolle, 1985) is to study the distribution and maturity of potential hydrocarbon source rocks in central and western North Greenland. A first broad reconnaissance and examination of most lithostratigraphic units throughout the region in 1984, followed by organic geochemical and palynofacies analyses, showed that some intervals in the Cambrian shelf sequence and in the Cambrian to Silurian trough sequence are sufficiently rich in organic matter to be considered as potential source rocks (Christiansen et al., 1985). The Cambrian and Ordovician trough sequence is thermally postmature with respect to hydrocarbon generation in the whole area. Consequently the second and final field programme within the project (1985) concentrated on the Cambrian shelf sequence (especially the Henson Gletscher Formation in the Brønlund Fjord Group) and the Silurian slope to trough sequence (Lafayette Bugt Formation and Wulff Land Formation). The main purpose of the 1985 work was to make a detailed study of these units combining field work and shallow core dril!ing. The samples and cores provide the basis for later detailed maturity studies and a quantitative evaluation of source rock quality and volume. As in 1984, the 1985 field season was fully integrated with the geological mapping programme in the region (Henriksen, this report). The field work was carried out by a team of two geologists and a dril!ing team with three technicians (John Boserup, Anders Clausen, Jørgen Bojesen-Koefoed) and a dril! site geologist. The three geologists alternated often in order to obtain continuity in the programme and furthermore six of the total 14 camps were located at the dril! sites (fig. 1).

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Geochemical and ore microscopic investigations on drainage sands from the Peary Land region, North Greenland

Rapport Grønlands Geologiske Undersøgelse ◽

10.34194/rapggu.v99.7680 ◽

1980 ◽

Vol 99 ◽

pp. 121-128

Author(s):

M Ghisler ◽

H Stendal

Keyword(s):

Stream Sediment ◽

Mineral Deposits ◽

Sediment Samples ◽

Geochemical Survey ◽

Geological Units ◽

North Greenland ◽

Land Region ◽

Microscopic Investigations

This study is part of a regional geochemical survey based on stream sediment samples collected in the summers af 1978 (fig. 55) and 1979 (cf. Henriksen, this report). The purpose of the present work is a first attempt to delineate areas or geological units, which may contain mineral deposits.

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