Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Karsten Secher is active.

Publication


Featured researches published by Karsten Secher.


Lithos | 1980

Geology and mineralogy of the Sarfartôq carbonatite complex, southern West Greenland

Karsten Secher; Lotte Melchior Larsen

Abstract The Sarfartoq carbonatite complex was emplaced in lower Palaeozoic time in a weakness zone within the Precambrian shield. Dolomitic magma intruded in two major stages of activity. In the first stage a steeply dipping conical body of concentric sheets of rauhaugite was formed, while in the second stage several batches of magma were emplaced into the surrounding marginal shock-zone as concentric and radial beforsite dykes and agglomerates. Hydrothermal activity gave rise to several phases of mineralisation in veins and shear zones. The accompanying fenitisation was of the Na-type. The whole complex covers about 90 km 2 . The main rock-forming minerals are dolomite-ankerite, apatite, orange reversely pleochroic phlogopite, richterite-arfvedsonite and magnetite. Important accessories are pyrochlore, zircon and niobian rutile. A complete mineral list is given, together with microprobe data on mineral chemistry. The dolomitic magmas were poor in SiO 2 , Al 2 O 3 and K 2 O in relation to other carbonatites. Nb, U and LREEs are strongly enriched in pyrochloremineralised zones where the Nb content may be up to 40%. Some shear zones are strongly enriched in Th and HREEs (specifically Eu) and lesser Pb and Zn. Niobium, uranium, rare earth elements and phosphorus occur in economically interesting concentrations.


Lithos | 1983

The age of carbonatites, kimberlites and lamprophyres from southern West Greenland: recurrent alkaline magmatism during 2500 million years

Lotte Melchior Larsen; David C. Rex; Karsten Secher

Abstract Alkaline rocks were intruded into the Precambrian basement in southern West Greenland during at least five separate episodes. The Tupertalik carbonatite intrusion was emplaced around or before 2650 m.y.; it is now metamorphosed in granulite facies but is recognisable by its trace element content. Lamprophyre dykes were intruded at ca. 1800 m.y. and again at ca. 1200 m.y. At ca. 600 m.y. the Sarfartoq carbonatite intrusion and extensive kimberlite dykes were emplaced in the Holsteiborg-Stromfjord region. At 225-115 m.y. the Qaqarssuk carbonatite complex was emplaced in the Sukkertoppen region, and numerous lamprophyre and kimberlite dykes were emplaced between Fishenasset and Ivigtut. All these episodes are correlatable with contemporaneous alkaline activity in Canada and Scandinavia and substantiate the periodicity of carbonatite emplacement. The Mesozoic suite of intrusions is related to rifting prior to continental break-up and the formation of the North Atlantic Ocean. The Eocambrian suite of 600 m.y. is thought to have formed under similar conditions during continental break-up and the formation of the Iapetus ocean.


Lithos | 2009

Timing of kimberlite, carbonatite, and ultramafic lamprophyre emplacement in the alkaline province located 64°-67° N in southern West Greenland

Karsten Secher; Larry M. Heaman; Troels F. D. Nielsen; Sven Monrad Jensen; F. Schjøth; Robert A. Creaser


Lithos | 2009

Distribution of kimberlite and aillikite in the Diamond Province of southern West Greenland: A regional perspective based on groundmass mineral chemistry and bulk compositions

Troels F. D. Nielsen; Svend M. Jensen; Karsten Secher; Karina K. Sand


Archive | 2002

Kimberlites and other ultramafic alkaline rocks in the Sisimiut-Kangerlussuaq region, southern West Greenland

Sven Monrad Jensen; Henriette Hansen; Karsten Secher; Agnete Steenfelt; Frands Schjøth; Thorkild M. Rasmussen


Archive | 2006

The Tikiusaaq carbonatite: a new Mesozoic intrusive complex in southern West Greenland

Agnete Steenfelt; Julie A. Hollis; Karsten Secher


Ore Geology Reviews | 2016

Metallogeny of Greenland

Jochen Kolb; Jakob K. Keiding; Agnete Steenfelt; Karsten Secher; Nynke Keulen; Diogo R. N. Rosa; Bo Møller Stensgaard


Geological Survey of Denmark and Greenland Bulletin | 2006

Review of Survey Activities 2005: Archetypal kimberlite from the Maniitsoq region, southern West Greenland and analogy to South Africa

Sven Monrad Jensen; Martin Jebens; Troels F. D. Nielsen; Karsten Secher


Archive | 2004

Investigating the diamond potential of southern West Greenland

Sven Monrad Jensen; Karsten Secher


Archive | 2014

Manganiferous minerals of the epidote group from the Archaean basement of West Greenland

Anna Katerinopoulou; Toni Balic-Zunic; Alfons Berger; Jochen Kolb; Karsten Secher

Collaboration


Dive into the Karsten Secher's collaboration.

Top Co-Authors

Avatar

Agnete Steenfelt

Geological Survey of Denmark and Greenland

View shared research outputs
Top Co-Authors

Avatar

Jochen Kolb

Geological Survey of Denmark and Greenland

View shared research outputs
Top Co-Authors

Avatar

Troels F. D. Nielsen

Geological Survey of Denmark and Greenland

View shared research outputs
Top Co-Authors

Avatar

Anna Katerinopoulou

American Museum of Natural History

View shared research outputs
Top Co-Authors

Avatar

Karina K. Sand

Geological Survey of Denmark and Greenland

View shared research outputs
Top Co-Authors

Avatar

Lotte Melchior Larsen

Geological Survey of Denmark and Greenland

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Bo Møller Stensgaard

Geological Survey of Denmark and Greenland

View shared research outputs
Top Co-Authors

Avatar

Diogo R. N. Rosa

Geological Survey of Denmark and Greenland

View shared research outputs
Top Co-Authors

Avatar

F. Schjøth

Geological Survey of Denmark and Greenland

View shared research outputs
Researchain Logo
Decentralizing Knowledge