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

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Authors:Jensen, Sven Monrad; Hansen, Henriette; Karsten, Hansen; Steenfeld, Agnete; Schjoth, Frands; Rasmussen, Thorkild M.
Author Affiliations:Primary:
Geological Survey of Denmark and Greenland, Copenhagen, Denmark
Volume Title:Review of Greenland activities; 2001
Volume Authors:Higgins, A. K., editor; Secher, Karsten; Sonderholm, Martin
Source:Review of Greenland activities; 2001, edited by A. K. Higgins, Karsten Secher and Martin Sonderholm. Geology of Greenland Survey Bulletin, No.191, p.57-66. Publisher: Danmarks og Gronlands Geologiske Undersogelse (GEUS), Copenhagen, Denmark. ISSN: 1397-1905. ISBN: 87-787-098-7
Publication Date:2002
Note:In English. 36 refs.; illus., incl. 2 tables, sketch maps
Summary:These ultramafic alkaline dykes intrude the border zone between the Archaean craton and the Palaeoproterozoic Nagssugtoqidian orogen. A report is given on two kimberlite dykes which contain abundant mantle xenoliths. At least 90% of the xenoliths have peridotitic or pyroxenitic compositions, some containing visible purple pyrope and green Cr-diopside, minerals that may indicate P-T conditions within the diamond stability field. EPMA results for Ni in the garnets in two garnet lherzolite xenoliths in combination with estimates from single clinopyroxene thermobarometry indicate P-T conditions of 48.9-57.8 ± 2.3 kbar and 1101 ± 18 to 1221 ± 30uC. [R.A.H.]
Sections:Petrology
Subsections:Igneous petrology
Subjects:Alkalic composition; Archean; Clastic sediments; Diamond deposits; Dikes; Geochemical anomalies; Geochemical methods; Igneous rocks; Inclusions; Indicators; Industrial minerals; Intrusions; Kimberlite; Lamproite; Lamprophyres; Mineral exploration; Paleoproterozoic; Physical properties; Plutonic rocks; Precambrian; Proterozoic; Sediments; Till; Ultramafic composition; Upper Precambrian; Xenoliths; Arctic region; Greenland; West Greenland; Kangerlussuaq Greenland; Sarfartoq Greenland; Sisimiut Greenland
Coordinates:N660000 N670000 W0520000 W0540000
Abstract Numbers:03M/4649
Record ID:2004022904
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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