Journal ArticleDOI
Cathodoluminescence and Microporosity in Alkali Feldspars from the Blå Måne Sø Perthosite, South Greenland
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TLDR
In this paper, a traverse across the BI~M~ne Sr perthosite unit in the Tugtut6q Central Complex of the Gardar province, South Greenland has been examined for cathodoluminescence characteristics, microporosity and 6180 isotopic values.Abstract:
Samples from a traverse across the BI~ M~ne Sr perthosite unit in the Tugtut6q Central Complex of the Gardar province, South Greenland have been examined for cathodoluminescence characteristics, microporosity and 6180 isotopic values. Reddening of cathodoluminescence colours in alkali feldspars (normally blue) from the unit may be correlated with increased microporosity of the feldspars as determined using scanning electron microscopy. 6180 values of all samples lie within the range of values expected of juvenile fluids, independent of the level of alteration indicated by cathodoluminescence studies. Observations are consistent with previous suggestions that levels of alkali feldspar microporosity and levels of fluid alteration (as determined by cathodoluminescence of alkali feldspars) are related phenomena. Oxygen isotope ratios suggest that the fluid is largely juvenile in origin, with, perhaps, some meteoric (low 6180) component.read more
Citations
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Journal ArticleDOI
The causes and petrological significance of cathodoluminescence emissions from alkali feldspars
Adrian A. Finch,Jeanette Klein +1 more
TL;DR: The cathodoluminescence (CL) of a variety of alkali feldspars from South Greenland has been examined in an attempt to understand the causes of the CL and its petrological significance as discussed by the authors.
Journal ArticleDOI
Tectono-magmatic evolution of the younger Gardar southern rift, South Greenland
TL;DR: In this article, the Gardar period in South Greenland involved continental rifting, sedimentation and alkaline magmatism, which evolved through marked iron enrichment to alkaline salic differentiates.
Journal ArticleDOI
Ion microprobe study of intragrain micropermeability in alkali feldspars
TL;DR: In this paper, it was found that the 18O had penetrated into the parts of the grain which were microporous and not into the pristine areas, and the micropores are responsible for rendering the feldspars permeable as well as porous.
Journal ArticleDOI
Identification of cathodoluminescence activators in zoned alkali feldspars by hyperspectral imaging and electron-probe microanalysis
TL;DR: In this article, the authors show that the fine-scale zoning in optical cathodoluminescence (CL) of patch perthite subgrains has two emission bands: one in the blue (similar to 460 nm) and the other at red-to-infrared (approximately 690-725 nm).
Journal ArticleDOI
Biotites as Indicators of Fluorine Fugacities in Late-Stage Magmatic Fluids: the Gardar Province of South Greenland
TL;DR: The major element chemistry and fluorine contents of biotites from the Gardar alkaline province of South Greenland provide an insight into the F contents of late-stage fluids associated with the magmatism as discussed by the authors.
References
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Journal ArticleDOI
Stable isotope characteristics of hydrocarbon gases in the alkaline Ilímaussaq complex, South Greenland
TL;DR: Les inclusions fluides des mineraux des syenites a nepheline and des filons hydrothermaux du complexe alcalin d'Ilimaussaq (Groenland du Sud) sont tres riches en hydrocarbures (principalement en methane), refletant des fugacites d'oxygene tres basses pendant and apres la cristallisation as mentioned in this paper.
Dissertation
The chemical and isotopic nature of fluids associated with alkaline magmatism, South Greenland
TL;DR: In the Gardar province of South Greenland, this article, metasomatic fluids were juvenile in origin, evolved from the silicate magmas themselves after final crystallisation, and catalysed catastrophic coarsening in alkali feldspars at temperatures below 450°C, and at lower temperatures, also brought about changes in their cathodoluminescence (CL) colours, altering blue luminescing feldspar to a red-luminescent variant.