Stable isotope (C, O, H) characteristics and genesis of the Tazheran brucite marbles and skarns, Olkhon region, Russia. / Doroshkevich, Anna; Sklyarov, Eugene; Starikova, Anastasia et al.
In: Mineralogy and Petrology, Vol. 111, No. 3, 01.06.2017, p. 399-416.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Stable isotope (C, O, H) characteristics and genesis of the Tazheran brucite marbles and skarns, Olkhon region, Russia
AU - Doroshkevich, Anna
AU - Sklyarov, Eugene
AU - Starikova, Anastasia
AU - Vasiliev, Vladimir
AU - Ripp, German
AU - Izbrodin, Ivan
AU - Posokhov, Viktor
N1 - Publisher Copyright: © 2016, Springer-Verlag Wien.
PY - 2017/6/1
Y1 - 2017/6/1
N2 - Stable isotope compositions are examined for brucite marble and Mg-skarn that occur in the southern part of the Tazheran massif, Olkhon region, Russia. Brucite marble exhibits a narrow range in δ18O of +23.3 to +26.2 ‰ and shows carbon isotope depletion of −1.9 to −4.4 ‰) as compared with the country dolomite isotope compositions (+2.0 to +2.4 ‰) which is explained by both decarbonation processes and participation of fluids depleted in 13C. The emplacement of brucite marble was accompanied by the formation of endo- and exoskarn at the contact between syenite and brucite marble. δ18O profiles across the contact show a typical decrease towards the syenite side interpreted as the result of fluid/rock interaction and influx of magmatic fluids. Finally, we discuss the mechanisms of brucite marble emplacement and consider three possible ways of producing these rocks: (1) injection of dolomite with subsequent transformation to periclase marble and then to brucite marble; (2) injection of periclase marble with a following replacement of periclase by brucite or injection of brucite marble; (3) crustal water-rich carbonate melt. We favor models 2 and 3 and discuss their strengths and weaknesses.
AB - Stable isotope compositions are examined for brucite marble and Mg-skarn that occur in the southern part of the Tazheran massif, Olkhon region, Russia. Brucite marble exhibits a narrow range in δ18O of +23.3 to +26.2 ‰ and shows carbon isotope depletion of −1.9 to −4.4 ‰) as compared with the country dolomite isotope compositions (+2.0 to +2.4 ‰) which is explained by both decarbonation processes and participation of fluids depleted in 13C. The emplacement of brucite marble was accompanied by the formation of endo- and exoskarn at the contact between syenite and brucite marble. δ18O profiles across the contact show a typical decrease towards the syenite side interpreted as the result of fluid/rock interaction and influx of magmatic fluids. Finally, we discuss the mechanisms of brucite marble emplacement and consider three possible ways of producing these rocks: (1) injection of dolomite with subsequent transformation to periclase marble and then to brucite marble; (2) injection of periclase marble with a following replacement of periclase by brucite or injection of brucite marble; (3) crustal water-rich carbonate melt. We favor models 2 and 3 and discuss their strengths and weaknesses.
KW - Brucite marble
KW - Decarbonation
KW - Fluid depleted in C
KW - Fluid-rock interaction
KW - Olkhon collision system
KW - Skarn
KW - Stable isotopes
KW - Tazheran gabbro-syenite massif
KW - CONTACT-METAMORPHISM
KW - SYSTEM
KW - Skam
KW - FRACTIONATION
KW - MINERALS
KW - INTRUSION
KW - SELF-ORGANIZATION
KW - OXYGEN
KW - BAIKAL REGION
KW - Fluid depleted in C-13
KW - CARBONATE
KW - WALL ROCK
UR - http://www.scopus.com/inward/record.url?scp=84990891518&partnerID=8YFLogxK
U2 - 10.1007/s00710-016-0477-8
DO - 10.1007/s00710-016-0477-8
M3 - Article
AN - SCOPUS:84990891518
VL - 111
SP - 399
EP - 416
JO - Mineralogy and Petrology
JF - Mineralogy and Petrology
SN - 0930-0708
IS - 3
ER -
ID: 10321190