Strain-driven disordering of low microline to low sanidine during partial phase separation in microperthites
Article Abstract:
The formation of coherent pleats in microperthite feldspars was analyzed during the strain-driven disordering of the low microline and low sanidine to characterize the geochemical origin of the Ab- and Or-rich pleats. Analysis of the microtextures in braid microperthite feldspar crystals indicated the presence of large alternating volume strains that were formed during phase separation in the transition zone. Furthermore, the pleated rims and intracrystalline pleats were driven by local strain that were caused by coherency stress during phase transformation.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1997
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Feldspar-fluid interactions in braid microperthites: pleated rims and vein microproperties
Article Abstract:
Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were utilized to characterize the grain boundaries and vein microperthites of alkali feldspars from Klokken, South Greenland intrusions. SEM and TEM analysis of the braid microperthitic alkali feldspars indicated the presence of two types of grain boundaries that were composed of alternating Ab- and Or-rich regions. The feldspars from Klokken, South Greenland were also composed of low albite and low microcline pleats.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1997
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Feldspar microtextures and multistage thermal history of syenites from the Coldwell Complex, Ontario
Article Abstract:
A study was conducted to establish microtextures and multistage thermal history of syenites. The study applied optical and transmission electron microscopy for analysis. Results show that perthites from augite syenites in Ontario's Coldwell Complex exhibited a complex set of microtextures which signified a multistage thermal history. Ripples indicate formation by coarsening during high-temperature fluid-feldspar interaction. These results offer bases for determining intrusive rock age.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1992
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