Sulfur and REE zoning in apatite: the example of the Colli Albani magmatic system

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F18%3A10382167" target="_blank" >RIV/00216208:11310/18:10382167 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1127/ejm/2018/0030-2701" target="_blank" >https://doi.org/10.1127/ejm/2018/0030-2701</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1127/ejm/2018/0030-2701" target="_blank" >10.1127/ejm/2018/0030-2701</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Sulfur and REE zoning in apatite: the example of the Colli Albani magmatic system

Popis výsledku v původním jazyce

We investigate the distribution of major and trace elements in apatite crystals hosted in granular alkaline rocks composed mainly of leucite and clinopyroxene, representative of the hypabyssal crystallization of a magma body in the Quaternary ultra-potassic Colli Albani Volcanic District (CAVD), which was emplaced into thick limestone units along the Tyrrhenian margin of Italy. Results show that the analyzed crystals are the SrO-richest (up to 4.6 wt%) fluorapatite (F = 2.6-3.7 wt%) of the Italian alkaline rocks. The strontium enrichment is caused by the lack of other Sr-compatible mineral phases, such as plagioclase, alkali feldspar and melilite, in these leucite-and clinopyroxene-bearing rocks. The studied samples show core-rim zoning with rims enriched in Si, S, and REE whereas the cores are enriched in Ca and P. The LREE-oxides contents of apatite, reaching 4.2 wt%, represent more than 95% of the total REE budget; SiO2 contents range from 1.3 to 3.6 wt%, and SO3 concentrations between 0.6 and 1.4 wt%. We support the idea that REE and sulfur enrichment are a response to the crystallization caused by the pressure drop in the magmatic system during the eruption and follow the substitution mechanisms Si4+ + REE3+ = P5+ + Ca2+ and S6+ + Si4+ = 2P(5+). The results also suggest the presence of the substitution Th4+ + 2Si(4+) = Ca2+ + 2P(5+).

Název v anglickém jazyce

Sulfur and REE zoning in apatite: the example of the Colli Albani magmatic system

Popis výsledku anglicky

We investigate the distribution of major and trace elements in apatite crystals hosted in granular alkaline rocks composed mainly of leucite and clinopyroxene, representative of the hypabyssal crystallization of a magma body in the Quaternary ultra-potassic Colli Albani Volcanic District (CAVD), which was emplaced into thick limestone units along the Tyrrhenian margin of Italy. Results show that the analyzed crystals are the SrO-richest (up to 4.6 wt%) fluorapatite (F = 2.6-3.7 wt%) of the Italian alkaline rocks. The strontium enrichment is caused by the lack of other Sr-compatible mineral phases, such as plagioclase, alkali feldspar and melilite, in these leucite-and clinopyroxene-bearing rocks. The studied samples show core-rim zoning with rims enriched in Si, S, and REE whereas the cores are enriched in Ca and P. The LREE-oxides contents of apatite, reaching 4.2 wt%, represent more than 95% of the total REE budget; SiO2 contents range from 1.3 to 3.6 wt%, and SO3 concentrations between 0.6 and 1.4 wt%. We support the idea that REE and sulfur enrichment are a response to the crystallization caused by the pressure drop in the magmatic system during the eruption and follow the substitution mechanisms Si4+ + REE3+ = P5+ + Ca2+ and S6+ + Si4+ = 2P(5+). The results also suggest the presence of the substitution Th4+ + 2Si(4+) = Ca2+ + 2P(5+).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA18-01982S" target="_blank" >GA18-01982S: Experimentální určení vlivu fugacity kyslíku na distribuci vysoce siderofilních prvků mezi minerály a taveninu v plášťových podmínkách</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

European Journal of Mineralogy

ISSN

0935-1221

e-ISSN

—

Svazek periodika

30

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

9

Strana od-do

125-133

Kód UT WoS článku

000431774600011

EID výsledku v databázi Scopus

2-s2.0-85047081135