Open AccessPreliminary account of kimberlite intrusions from the Frederikshåb district, South-West Greenland
Author(s) -
James R. Andrews,
C. H. Emeleus
Publication year - 1971
Publication title -
rapport
Language(s) - English
Resource type - Journals
eISSN - 2597-2944
pISSN - 0418-6559
DOI - 10.34194/rapggu.v31.7245
Subject(s) - kimberlite , peridotite , geology , geochemistry , phlogopite , igneous rock , ultramafic rock , mesozoic , crust , craton , granulite , spinel , magma , mantle (geology) , tectonics , geomorphology , paleontology , facies , structural basin , volcano
Kimberlite intrusions from three localities, Nigerdlikasik, Pyramidefjeld and Midternæs, show closely comparable petrographicaI, mineralogical and geochemical features. They contain ultramafic gamet, spinel and phlogopite peridotite inclusions which appear to have been derived from the Upper MantIe, though scapolite granulite nodules in the Nigerdlikasik kimberlite must have originated in the lower crust. Garnet and spinel peridotite were sampled at successively higher levels by the kimberlite magma and micaceous peridotites wete produced by phlogopitisation of some of these inclusions during transport. Generation of the kimberlites took place during, the early Mesozoic and forms part of the Mesozoic pattern of igneous activity in South-West Greenland.