FEATURES OF REE AND Sr DISTRIBUTION IN APATITE OF DIFFERENT GENESIS FROM THE ALDAN SHIELD (SIBERIAN PLATFORM)
Keywords:
apatite, REE, Sr, isomorphism, apatite-carbonate and apatite-silicate rocks, skarn, Precambrian, Aldan Shield.Abstract
Results of REE and other isomorphic substituted elements distribution in apatite from carbonate, silicate rocks, and skarns from the Aldan Shield (Siberian Platform, Sakha (Yakutia) Republic) as well as peculiarities of its composition are given. Initial data were obtained by electron probe microanalyses (EPMA) in order to clarify the apatite forming process and determine its peculiarities during origin of the investigated rocks and ores. Analyzing of the studied elements was made on the apatite sections, which were prepared due to cut of the samples perpendicularly to the L6 axis of the mineral. Received concentration data authors used to create a set of component distribution maps for every studied element. Comparison of the concentration isopleths have been shown complicated pictures of the studied elements distribution besides relatively well prismatic crystal habit of the apatite. Any clear differences in elements distribution within apatite crystals from the genetically various mineral associations have not been detected. Heterogeneous character of element distribution within the same apatite indicates on irregular components supply for different growth sectors of apatite.
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