Geochemical signatures of gold provinces in South Greenland

Steenfelt, Agnete

doi:10.1179/aes.2000.109.1.14

Cited by 9 publications

(7 citation statements)

References 29 publications

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“…High counts of this element therefore indicate minimal contribution of terrestrial-sourced material to the bulk sediment (Calvert and Pedersen, 1993;Rothwell and Croudace, 2015). K and Rb are both typical for environments with terrestrial influence (Saito, 1998;Steenfelt, 2001;Steenfelt at al., 1998). The Ca/Ti and Ca/Sr ratios can be used as indicators of the marine biogenic origin of Ca (Bahr et al, 2005;Richter et al, 2005).…”

Section: Geochemistrymentioning

confidence: 96%

Reconstruction of Holocene oceanographic conditions in the Northeastern Baffin Bay

Hansen

Giraudeau

Wacker

et al. 2020

Preprint

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Abstract. The Baffin Bay is a semi-enclosed basin connecting the Arctic Ocean and the western North Atlantic, thus making out a significant pathway for heat exchange. Here we reconstruct the alternating advection of relatively warmer and saline Atlantic waters versus the incursion of colder Arctic water masses entering the Baffin Bay through the multiple gateways in the Canadian Arctic Archipelago and the Nares Strait during the Holocene. We carried out benthic foraminiferal assemblage analyses, X-Ray Fluorescence scanning and radiocarbon dating of a 738 cm long marine sediment core retrieved from the eastern Baffin Bay near Upernavik (Core AMD14-204C; 987m water depth). Results reveal that the eastern Baffin Bay was subjected to several oceanographic changes during the last 9.2 ka BP. Waning deglacial conditions with enhanced meltwater influxes and an extensive sea-ice cover prevailed in the eastern Baffin Bay from 9.2–7.9 ka BP. A transition towards bottom water ameliorations are recorded at 7.9 ka BP by increased advection of Atlantic water masses, encompassing the Holocene Thermal Maximum. A cold period with growing sea-ice cover at 6.7 ka BP interrupts the overall warm subsurface water conditions, promoted by a weaker northward flow of Atlantic waters. The onset of the Neoglaciation at ca. 2.9 ka BP, is marked by an abrupt transition towards a benthic fauna dominated by agglutinated species likely partly explained by a reduction of the influx of Atlantic water, allowing increased influx of the cold, corrosive Baffin Bay Deep Water originating from the Arctic Ocean, to enter the Baffin Bay through the Nares Strait. These cold subsurface water conditions persisted throughout the late Holocene, only interrupted by short-lived warmings superimposed on this cooling trend.

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Section: Geochemistrymentioning

confidence: 96%

Reconstruction of Holocene oceanographic conditions in the Northeastern Baffin Bay

Hansen

Giraudeau

Wacker

et al. 2020

Preprint

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“…The Nalunaq gold mineralisation is classified as a mesothermal vein-type gold deposit hosted in metavolcanic rocks (Secher et al, 2008) and the surrounding region is characterised as a gold province with several promising occurrences (Steenfelt, 2000;Stendal and Secher, 2002). The ore, which consists of a gold-bearing quartz vein (known as the main vein) and proximal hydrothermally altered dolerites and amphibolites (Schlatter and Olsen, 2011), was crushed, milled and treated by cyanide leaching in an extraction plant on-site.…”

Section: Mine Tailingsmentioning

confidence: 99%

Screening of heavy metal containing waste types for use as raw material in Arctic clay-based bricks

Belmonte

Ottosen

Kirkelund

et al. 2016

Environ Sci Pollut Res

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“…Gold exploration has focused on the Archaean and Palaeoproterozoic Precambrian shield of West Greenland and the Palaeogene Skaergaard layered gabbro intrusion (p. 62) in southern East Greenland (Andersen et al 1998;. A major new gold province in the Palaeoproterozoic Ketilidian orogen forming the southern tip of Greenland (Steenfelt 2000;Stendal & Frei 2000;Stendal & Secher 2002) was first recognised by panning of stream sediments, and in 1992 visible gold was found in quartz veins transecting mafic supracrustal rocks. The Nalunaq Gold Mine in Kirkespirdalen (a valley north-east of Nanortalik) operated from 2004 to 2008, but the mine is presently (2009) placed on 'care and maintenance'.…”

Section: Offshore North Greenland; the Lincoln Sea Basinmentioning

confidence: 99%

Greenland from Archaean to Quaternary. Descriptive text to the 1995 Geological map of Greenland, 1:2 500 000. 2nd edition

et al. 2009

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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.

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Geochemical signatures of gold provinces in South Greenland

Cited by 9 publications

References 29 publications

Reconstruction of Holocene oceanographic conditions in the Northeastern Baffin Bay

Reconstruction of Holocene oceanographic conditions in the Northeastern Baffin Bay

Screening of heavy metal containing waste types for use as raw material in Arctic clay-based bricks

Greenland from Archaean to Quaternary. Descriptive text to the 1995 Geological map of Greenland, 1:2 500 000. 2nd edition

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