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@article{1228840,
author = {Kotková, Jana and Škoda, Radek and Machovič, Vladimír},
article_location = {CHANTILLY},
article_number = {8-9},
doi = {http://dx.doi.org/10.2138/am.2014.4889},
keywords = {High-temperature studies; kumdykolite; micro-Raman; micro-Raman mapping; BSE; WDX; high-temperature; ultrahigh-pressure; granulite; microdiamond},
language = {eng},
issn = {0003-004X},
journal = {American Mineralogist},
title = {Kumdykolite from the ultrahigh-pressure granulite of the Bohemian Massif},
volume = {99},
year = {2014}
}
TY - JOUR
ID - 1228840
AU - Kotková, Jana - Škoda, Radek - Machovič, Vladimír
PY - 2014
TI - Kumdykolite from the ultrahigh-pressure granulite of the Bohemian Massif
JF - American Mineralogist
VL - 99
IS - 8-9
SP - 1798-1801
EP - 1798-1801
PB - Mineralogical Society of America
SN - 0003004X
KW - High-temperature studies
KW - kumdykolite
KW - micro-Raman
KW - micro-Raman mapping
KW - BSE
KW - WDX
KW - high-temperature
KW - ultrahigh-pressure
KW - granulite
KW - microdiamond
N2 - We report the first occurrence of kumdykolite, a high-temperature analog of albite, in the European Variscan belt. It was discovered in an ultrahigh-pressure, diamond-bearing quartzofeldspathic granulite from the northern Bohemian Massif. It is associated with phlogopite and quartz in a multiphase solid inclusion within garnet, considered to represent a trapped fluid or melt phase. Micro-Raman analysis and mapping along with BSE revealed the presence of a sub-equant, elongated grain of kumdykolite reaching 20 mu m in length. WDX analysis has shown that kumdykolite contains 2 wt% CaO, probably indicating significant miscibility with the Ca-end-member svyatoslavite. Similar to the case of microdiamond inclusions, the kumdykolite-bearing multiphase inclusion is located in the Ca- and Mg-rich central part of the garnet and thus must have been trapped at P > 4 GPa. The inclusion minerals, however, crystallized upon decompression and cooling during the exhumation. Kumdykolite preservation thus provides independent evidence for high temperature of the original trapped fluid, or melt, crystallization, and rapid cooling of the rocks. Our results imply that kumdykolite and other feldspar modifications stable at elevated pressures and temperatures may be common phases in quartzofeldspathic granulites and need to be searched for.
ER -
KOTKOVÁ, Jana, Radek ŠKODA a Vladimír MACHOVIČ. Kumdykolite from the ultrahigh-pressure granulite of the Bohemian Massif. \textit{American Mineralogist}. CHANTILLY: Mineralogical Society of America, 2014, roč.~99, 8-9, s.~1798-1801. ISSN~0003-004X. Dostupné z: https://dx.doi.org/10.2138/am.2014.4889.
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