NOVÉ VÝZKUMY V HORNINÁCH TĚŠÍNITOVÉ ASOCIACE: FLUORAPATIT SE ZVÝŠENÝMI OBSAHY SR A REE

Abstract

Famous intrusive, sub-volcanic and extrusive alkaline rocks of teschenite province in Moravian-Silesian Beskydes are newly study in detail. The set of selected alkaline rocks is characterised by the unussually high volume of apatite (5–10 %). Four types (A1–A4) of the Sr- and REE-enriched fluorapatites were distinguish in these teschenites s.s. Rare unaltered type A1 contains melt inclusions and usually slightly altered type A2 which encloses wide solid inclusions are regarded as magmatic in origin; its remobilization along fractures gave type A3, which is followed by the youngest elongated and capillaceous type A4. On the basis of trace analysis of REE by LA-ICP-MS, chondrite-normalized spectra present different shapes, with a typical enrichement of LREE in magmatic types and metasomatic type A3. Younger type A4 is relatively depleted in all LREE, while its HREE profile is close to both magmatic and metasomatic older types A1–A3. The normalized spectrum of A1 and its melt inclusions have a symmetric shape, without Eu anomaly which is obvious (negative) in younger types A3 and A4

    Similar works