Dolenec, Matej and Serafimovski, Todor and Daneu, Nina and Dolenec, Tadej and Rogan Šmuc, Nastja and Vrhovnik, Petra and Lojen, Sonja (2015) The case of the carbonatite-like dyke of the Madenska River complex at the Kriva Lakavica section in the Republic of Macedonia: oxygen and carbon isotopic constraints. Turkish Journal of Earth Sciences, 24. pp. 627-639. ISSN 1300-0985
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Abstract
The oxygen and carbon isotope compositions of carbonate samples from the carbonatite-like dyke of the Madenska River
complex at the Kriva Lakavica section, samples of calcite skarns from the Damjan Fe-ore deposit and the Sasa Pb-Zn ore deposit, and
samples of marbles from the Pohorje Mountains were analyzed to provide critical evidence in favor of the magmatic or sedimentary
origin of this carbonatite-like dyke.
We suggest that the carbonatite-like dyke is not a “normal” carbonatite, but instead represents melted carbonates, which can be associated
with an unexposed, deep-seated, causative magmatic body. This dyke has a fluidal texture and carries xenoliths of ultramafic rocks that
can be up to 35 cm in size. Its isotopic composition plots between primary unaltered carbonatites and marine carbonates, and ranges
between 13.79‰ and 18.89‰ for δ18OVSMOW and between –1.22‰ and 1.31‰ for δ13CVPDB. These values are significantly lower than
those observed in carbonatites analyzed during this study and range between 6.53‰ and 8.10‰ for δ18OVSMOW and between –5.82‰
and –4.32‰ for δ13CVPDB, which is the primary isotope signature of most magmatic carbonatites. Similarly high δ18O and δ13C values
were found in skarns of the Damjan Fe deposit close to the Madanska River complex and in the Sasa Pb-Zn deposit, as well as in highgrade
regional metamorphic calcitic marbles of the Pohorje massive.
The emplacement levels of the carbonatite-like dyke, due to several tectonic processes, are uncertain. The type of country rocks
(sedimentary carbonates, ultramafic, mafic, and granitic rocks), hydrothermal alternation, and metasomatic and regional metamorphic
processes seem to be the most important parameters that affect the O and C isotopic patterns found in the Kriva Lakavica carbonatitelike
dyke and in the investigated samples.
| Item Type: | Article |
|---|---|
| Subjects: | Natural sciences > Earth and related environmental sciences |
| Divisions: | Faculty of Natural and Technical Sciences |
| Depositing User: | Todor Serafimovski |
| Date Deposited: | 04 Nov 2015 08:53 |
| Last Modified: | 04 Nov 2015 08:53 |
| URI: | https://eprints.ugd.edu.mk/id/eprint/14165 |
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