Conditions of origin of kimberlites in West Greenland: new evidence from the Sarfartoq and Sukkertoppen regions

Lotte Melchior Larsen; Jørn Rønsbo

doi:10.34194/rapggu.v159.8219

Conditions of origin of kimberlites in West Greenland: new evidence from the Sarfartoq and Sukkertoppen regions

Lotte Melchior Larsen, Jørn Rønsbo

Department of Mapping and Mineral Resources

Research output: Contribution to journal › Article › Research › peer-review

Abstract

Minerals in a garnet lherzolite nodule from Sarfartoq and macrocrysts in a kimberlite from the Sukkertoppen region have been analysed by microprobe. Temperatures calculated for the Sarfartoq nodule lie in the range 1110–1137°C, and pressures are estimated at greater than 50 kbar. The calculated temperature for the Sukkertoppen macrocrysts is 1309°C. Temperatures recalculated from existing data for kimberlites in the Holsteinsborg region and in SW Greenland lie in the range 1034–1078°C (40-50 kbar). The temperature variations may reflect the setting of the kimberlites in Archaean and Proterozoic terrains. Assuming a common geotherm of 40mW/m² all the kimberlites in West Greenland originated within the diamond stability field.

Original language	English
Pages (from-to)	115-120
Number of pages	6
Journal	Rapport Grønlands Geologiske Undersøgelse
Volume	159
DOIs	https://doi.org/10.34194/rapggu.v159.8219
Publication status	Published - 1 Jan 1993

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Programme Area 4: Mineral Resources

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10.34194/rapggu.v159.8219Licence: CC BY

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title = "Conditions of origin of kimberlites in West Greenland: new evidence from the Sarfartoq and Sukkertoppen regions",

abstract = "Minerals in a garnet lherzolite nodule from Sarfartoq and macrocrysts in a kimberlite from the Sukkertoppen region have been analysed by microprobe. Temperatures calculated for the Sarfartoq nodule lie in the range 1110–1137°C, and pressures are estimated at greater than 50 kbar. The calculated temperature for the Sukkertoppen macrocrysts is 1309°C. Temperatures recalculated from existing data for kimberlites in the Holsteinsborg region and in SW Greenland lie in the range 1034–1078°C (40-50 kbar). The temperature variations may reflect the setting of the kimberlites in Archaean and Proterozoic terrains. Assuming a common geotherm of 40mW/m2 all the kimberlites in West Greenland originated within the diamond stability field.",

author = "Larsen, {Lotte Melchior} and J{\o}rn R{\o}nsbo",

year = "1993",

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doi = "10.34194/rapggu.v159.8219",

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TY - JOUR

T1 - Conditions of origin of kimberlites in West Greenland: new evidence from the Sarfartoq and Sukkertoppen regions

AU - Larsen, Lotte Melchior

AU - Rønsbo, Jørn

PY - 1993/1/1

Y1 - 1993/1/1

N2 - Minerals in a garnet lherzolite nodule from Sarfartoq and macrocrysts in a kimberlite from the Sukkertoppen region have been analysed by microprobe. Temperatures calculated for the Sarfartoq nodule lie in the range 1110–1137°C, and pressures are estimated at greater than 50 kbar. The calculated temperature for the Sukkertoppen macrocrysts is 1309°C. Temperatures recalculated from existing data for kimberlites in the Holsteinsborg region and in SW Greenland lie in the range 1034–1078°C (40-50 kbar). The temperature variations may reflect the setting of the kimberlites in Archaean and Proterozoic terrains. Assuming a common geotherm of 40mW/m2 all the kimberlites in West Greenland originated within the diamond stability field.

AB - Minerals in a garnet lherzolite nodule from Sarfartoq and macrocrysts in a kimberlite from the Sukkertoppen region have been analysed by microprobe. Temperatures calculated for the Sarfartoq nodule lie in the range 1110–1137°C, and pressures are estimated at greater than 50 kbar. The calculated temperature for the Sukkertoppen macrocrysts is 1309°C. Temperatures recalculated from existing data for kimberlites in the Holsteinsborg region and in SW Greenland lie in the range 1034–1078°C (40-50 kbar). The temperature variations may reflect the setting of the kimberlites in Archaean and Proterozoic terrains. Assuming a common geotherm of 40mW/m2 all the kimberlites in West Greenland originated within the diamond stability field.

U2 - 10.34194/rapggu.v159.8219

DO - 10.34194/rapggu.v159.8219

M3 - Article

SN - 0418-6559

VL - 159

SP - 115

EP - 120

JO - Rapport Grønlands Geologiske Undersøgelse

JF - Rapport Grønlands Geologiske Undersøgelse

ER -

Conditions of origin of kimberlites in West Greenland: new evidence from the Sarfartoq and Sukkertoppen regions

Abstract

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