J 2007

Compositional evolution and substitutions in disseminated and nodular tourmaline from leucocratic granites: Examples from the Bohemian Massif, Czech Republic

BURIÁNEK, David and Milan NOVÁK

Basic information

Original name

Compositional evolution and substitutions in disseminated and nodular tourmaline from leucocratic granites: Examples from the Bohemian Massif, Czech Republic

Name in Czech

Chemický vývoj a substituce v rozptýlených a nodulárních turmalínech z leukokrátních granitů: Příklad z Českého masivu, Český masiv

Authors

BURIÁNEK, David (203 Czech Republic) and Milan NOVÁK (203 Czech Republic, guarantor)

Edition

Lithos, 2007, 0024-4937

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10500 1.5. Earth and related environmental sciences

Country of publisher

Norway

Confidentiality degree

není předmětem státního či obchodního tajemství

Impact factor

Impact factor: 2.937

RIV identification code

RIV/00216224:14310/07:00022904

Organization unit

Faculty of Science

UT WoS

000245782700012

Keywords in English

tourmaline granite

Tags

Změněno: 25/6/2008 07:23, prof. RNDr. Milan Novák, CSc.

Abstract

ORIG CZ

V originále

Two distinct textural types of tourmaline were distinguished in leucocratic granites of the Bohemian Massif (Moldanubicum, Saxothuringicum): (i) commonly euhedral disseminated tourmaline (DT) crystallized in relatively early stage of the granite consolidation, and (ii) typically interstitial nodular tourmaline (NT) formed during the stage transitional from late solidus to early subsolidus crystallization. Very similar chemical composition and similar fractionation trends in both DT and NT tourmaline types indicate crystallization in a quasi-closed system from early solidus to early subsolidus stage of granite consolidation. The substitutions in tourmaline from NT granites in the Moldanubicum are more similar to the substitutions in tourmaline from Li-poor granitic pegmatites in the same region relative to tourmaline from DT granites. Plotting of EMP analyses of tourmaline in diverse diagrams strongly suggests using combination of ternary diagrams Al Fe Mg and Na Ca Xsite vacancy and simple plots involving single cations (elements) such as Na/Al, F/Na, Fe/Mg rather then more complicated diagrams (e.g., R1+R2/R3) to characterize chemical composition and to derive substitution mechanisms in Ca-poor tourmaline from granitic rocks. The complex diagrams e.g., R1+R2 versus R3 do not enable to investigate compositional evolution in the Xsite and Wsite properly and oversimplifies the real substitutions. We recommend using specific diagrams for specific tourmaline compositions (e.g., Carich, Lirich).

In Czech

Byly studovány dva texturně odlišné typy tourmalinu z granitu, jejich chemické slžení a subtituční mechanismy.

Links

MSM0021622412, plan (intention)
Name: Interakce mezi chemickými látkami, prostředím a biologickými systémy a jejich důsledky na globální, regionální a lokální úrovni (INCHEMBIOL) (Acronym: INCHEMBIOL)
Investor: Ministry of Education, Youth and Sports of the CR, Interactions among the chemicals, environment and biological systems and their consequences on the global, regional and local scales (INCHEMBIOL)