Two types of scapolite in Evate carbonatite deposit (Mozambique): implications for magmatic versus metamorphic origins
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F19%3A00123844" target="_blank" >RIV/00216224:14310/19:00123844 - isvavai.cz</a>
Result on the web
<a href="http://www.geopaleo.fns.uniba.sk/ageos/articles/abstract.php?path=gajdosova_et_al&vol=11&iss=2" target="_blank" >http://www.geopaleo.fns.uniba.sk/ageos/articles/abstract.php?path=gajdosova_et_al&vol=11&iss=2</a>
DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Two types of scapolite in Evate carbonatite deposit (Mozambique): implications for magmatic versus metamorphic origins
Original language description
Two types of scapolite occur in the Evate carbonatite deposit – the largest resource of apatite in south-east Africa. Calc-silicate rocks composed of amphiboles (hastingsite, hornblende, actinolite, and pargasite), diopside, Ba-rich phlogopite, allanite, epidote, apatite, K-feldspar, titanite, and minor calcite, also contain scapolite with 62–74 mol. % of meionite – (Me) end-member, XCl = 0.06–0.17 and the crystallochemical formula corresponding to (Ca2.46–2.99Na1.00–1.47)Σ4.00–4.20Al4.62–5.04Si6.95–7.37O24(Cl0.06–0.17S0.18–0.26C0.64–0.70)Σ1.00. In contrast, carbonatite contains scapolite ranging from Na meionite to Ca marialite with 46–63 mol. % Me, XCl = 0.19–0.47 and the crystallochemical formula (Na1.43–2.07Ca1.82–2.50)Σ3.97–4.11Al4.29–4.73Si7.27–7.70O24(Cl0.19–0.47S0.00–0.25C0.45–0.74)Σ1.00. The chemical composition of scapolites mirrors the complex history and multistage evolution of the Evate deposit. The low-Cl, high-S scapolites from calc-silicate rocks are chemically indistinguishable from metamorphic scapolites, whereas the Cl-rich scapolite from carbonatite is interpreted as magmatic in origin. The gradual Cl enrichment reflects an increasing NaCl activity in the scapolite-forming fluid or melt. Both scapolite types are closely associated with amphibole and phlogopite, thus indicating amphibolite-facies conditions during retrograde stages of Late-Proterozoic (Ediacaran) granulite-facies metamorphism and/or Ordovician reactivation.
Czech name
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Czech description
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Classification
Type
J<sub>SC</sub> - Article in a specialist periodical, which is included in the SCOPUS database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Acta Geologica Slovaca
ISSN
1338-0044
e-ISSN
1338-5674
Volume of the periodical
11
Issue of the periodical within the volume
2
Country of publishing house
SK - SLOVAKIA
Number of pages
12
Pages from-to
63-74
UT code for WoS article
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EID of the result in the Scopus database
2-s2.0-85078628902