Dolomite exsolution textures in calcite from the Siilinjärvi carbonatite complex, Finland | Zendy

K. Puustinen | Zendy

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Dolomite exsolution textures in calcite from the Siilinjärvi carbonatite complex, Finland

Author(s) -

K. Puustinen

Publication year - 1974

Publication title -

bulletin of the geological society of finland

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.4

H-Index - 24

eISSN - 1799-4632

pISSN - 0367-5211

DOI - 10.17741/bgsf/46.2.008

Subject(s) - calcite , carbonatite , dolomite , geology , geochemistry , mineralogy , mantle (geology)

Lamellar, bleb-like and myrmekitic dolomite-calcite intergrowths have been observed in the carbonate rocks of the Siilinjärvi carbonatite complex, Finland. Textures are the result of exsolution of dolomite from a magnesian calcite. Replacement of calcite by dolomite is rare within the complex. The calcites contain on an average 1 .45 % MgO. The composition of the coexisting dolomite-calcite pairs corresponds to a minimum equilibration temperature of 450°C. Fe and Mn are enriched in the dolomites, Sr and Ba in the calcites.

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