Fluoro-alumina titanite (grotite) from granites of the TuroChak Complex (Mountain Altai)
Abstract
Relevance. The use of titanite as a geochronometer mineral has recently become increasingly popular. In this case, both magmatic and metamorphic titanite are found in granitoids. The latter is a product of low-grade biotite transformation. The content of iron, fluorine and alumina, as well as their various ratios, can serve as an indicator of titanite genesis. The most informative in the composition of fluorine-aluminous titanite can be the Fe/Al and (Fe+Al)/F ratios indicating the magmatic or metamorphic origin of titanite. The aim of the paper is to study the chemical composition of titanite to determine its genesis in the granites of the Turochak complex and the possibility of its subsequent use for geochronological studies. The object of the study was titanite from granites of the third phase of the intrusion of the Turochak granosyenite-granite-leucogranite complex (γD1t) located in the Gorno-Altai fragment of the Altai-Minusinsk early-middle Devonian igneous belt of the Altai-Sayan folded region (ASFR). The research methods included: petrographic description of rocks, study of titanite composition with subsequent crystallochemical recalculations of titanite composition by the charging method and compilation of formulas, as well as analysis of Fe/Al and (Fe+Al)/F ratios in titanite. The chemical composition was determined in polished sections on a Tescan Vega3 scanning electron microscope (SEM) with an Oxford X-ray fluorescence energy-dispersive analysis attachment. Results. It was established that titanite from the granites of the Turochak complex is fluorine-alumina and has the following formula (Ca0.97-1.00Fe0.01-0.02)Ʃ0.99-1.01Ti0.79-0.81Al0.18-0.22)Ʃ0.98-1.01(Si0.98-1.00Al0-0.02)Ʃ1.00O4(O0.81-0.86F0.14-0.19)Ʃ1.00. The ratios in its composition Fe/Al (less than 1:8) and (Fe+Al)/F (close to 1:1) indicate the metamorphic genesis of titanite and, as a consequence, the impossibility of its use for the purposes of geochronology of the granites of the Turochak complex.
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