Genesis of vein stockwork and sedimentary magnesite and hydromagnesite deposits in the ultramafic terranes of southwestern Turkey: a stable isotope study
Abstract
Vein stockworks and lacustrine developments of cryptocrystalline magnesium carbonates of Neogene and Quaternary age occur within the partially serpentinized, discontinuous ultramafic belts of southwestern Turkey. They are comparable to the Neogene cryptocrystalline magnesite bodies elsewhere in the Alpine orogen to the northwest and southeast. Our previous work (Fallick et al., 1991) suggested that cool (less than or equal to 100 degrees C) modified meteoric water was the mineralizer, that ultramafic rock was the source of the magnesium, but that there were three separate sources of the (bi)carbonate. These sources were distinguishable by their stable isotope composition as follows: (1) low-temperature carbonate with delta(18)O((SMOW)) values of similar to 36 per mil and delta(13)C((PDB)) values of similar to 4 per mil, from CO2; (2) moderate-temperature carbonate with delta(18)O((SMOW)) values of +28 per mil and delta(13)C((PDB)) values of -15 per mil, by decarboxylation of organic-rich sediments; and (3) higher temperature carbonate with delta(18)O((SMOW)) values of similar to 19 per mil and delta(13)C((PDB)) values of similar to 3 per mil, assumed to have been generated by contact metamorphism of Paleozoic marine limestone at depth. In general these magnesite deposits were found to fall into two groups, comprising carbonate generated on two mixing lines. The first group spanned the putative mixing line from the atmospheric source (1) to organically derived source of CO2 (2…
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Tutluca magnesite clumped-isotope temperature is 24.0 °C, lower than conventional oxygen isotope thermometry estimates of 37.9 °C for Tutluca and -80 °C for other Turkish vein complexes.
“The clumped-isotope temperature for Tutluca magnesite is 24.0 ° C, lower than estimated using conventional oxygen isotope thermometry for the Tutluca deposit with 37.9 ° C (Kahya and Kus ß cu, 2014) and other large magnesite vein complexes in Turkey at 80 ° C (Zedef et al., 2000; Table A1 and Fig. 11).”
From Clumped-isotope thermometry of magnesium carbonates in ultramafic rocks (2016) · cites this paper as Zedef et al., 2000
A hydrothermal origin for magnesite requires moderate to higher temperatures to provide conditions for the release of mineralizing CO2.
“In contrast, a hydrothermal origin requires moderate to higher temperatures to provide conditions for the release of mineralizing CO2 ( e.g. , via decarboxylation and decarbonation reactions during thermal contact metamorphism; Zedef et al., 2000).”
From Clumped-isotope thermometry of magnesium carbonates in ultramafic rocks (2016) · cites this paper as Zedef et al., 2000
Genetic models for the formation of ultramafic-hosted cryptocrystalline magnesite proposed to date are varied and appear to be site-specific.
“Genetic models for the formation of ultramafic-hosted cryptocrystalline magnesite proposed to date are varied and appear to be site-specific (Petrov, 1980; Pohl, 1990; Jedrysek and Halas, 1990; Fallick et al., 1991; Abu-Jaber and Kimberley, 1992a; Zedef et al., 2000; Ghoneim et al., 2003; Gartzos, 2004; Ece et al., 2005; Kelemen and Matter, 2008; Mirnejad et al., 2008; Jurkovic ´ et al., 2012;”
From Clumped-isotope thermometry of magnesium carbonates in ultramafic rocks (2016) · cites this paper as Zedef et al., 2000
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Clumped-isotope thermometry of magnesium carbonates in ultramafic rocks
García del Real, P., Maher, K., Kluge, T., Bird, D. K., Brown, G. E., & John, C. M. (2016) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2016.08.003 · Cited by 50 · see citing works
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- Authors
- Zedef, V., Russell, M. J., Fallick, A. E., & Hall, A. J.
- Affiliations
- University of Glasgow (GB)
- Venue
- Economic Geology
- Publisher
- Society of Economic Geologists, Inc.
- Published
- 2000-03-01
- Volume
- 95
- Issue
- 2
- Pages
- 429-445
- ISSN
- 0361-0128 (ISSN-L)
- OpenAlex
- W2059352805
- Cited by
- 103
- References
- 7
- Citations by year
- 2026: 4 · 2025: 5 · 2024: 1 · 2023: 9 · 2022: 6 · 2021: 4 · 2020: 5 · 2019: 7 · 2018: 6 · 2017: 5 · 2016: 8 · 2015: 2 · 2014: 3 · 2013: 3 · 2012: 4
- FWCI
- 1.56
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Economic Geology (publishedVersion)
- Funders
- Gebze Yüksek Teknoloji Enstitüsü
- Selçuk Üniversitesi
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Groundwater and Isotope Geochemistry
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Keywords
- hydromagnesite, stable isotopes, carbon and oxygen isotopes, serpentinization, meteoric water, bicarbonate, contact metamorphism, Neogene deposits, Quaternary deposits
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