FRACTIONATION OF CARBON AND OXYGEN ISOTOPES IN 13C-RICH PALAEOPROTEROZOIC DOLOSTONES IN THE TRANSITION FROM MEDIUM-GRADE TO HIGH-GRADE GREENSCHIST FACIES: A CASE STUDY FROM THE KOLA SUPERDEEP DRILLHOLE
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dc.contributor.author | Melezhik V.A. | |
dc.contributor.author | Fallick A.E. | |
dc.contributor.author | Smirnov Yu.P. | |
dc.contributor.author | Yakovlev Yu.N. | |
dc.date.accessioned | 2022-02-02T08:58:57Z | |
dc.date.available | 2022-02-02T08:58:57Z | |
dc.date.issued | 2003 | |
dc.identifier | https://elibrary.ru/item.asp?id=7705655 | |
dc.identifier.citation | Journal of the Geological Society, 2003, 160, , 71 | |
dc.identifier.issn | 0016-7649 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/34830 | |
dc.description.abstract | Samples from the Kola Superdeep Drillhole (12 262 m), a deep drillhole (1060 m), and from the surface, seaprated by only around 10 km, provided a unique opportunity for direct tracing of delta13C and delta18O changes through a low- to high-grade greenschist-facies transition within impure, 13C-rich Palaeoproterozoic dolostones. The least-altered dolostones have delta13C of +9‰ and delta18O of 22‰ . The metamorphic transition is expressed by dolomite + calcite1 + quartz ± K-feldspar to tremolite + calcite2 ± dolomite ± calcite1 and defined by 13C depletion of calcite2 (c. 3.0‰ ), calcite1 (1.0-2.0‰ ) and dolomite (<1‰ ) which is associated with a Rayleigh distillation process. delta18O shows a considerable resetting in all carbonate components by around 6‰ caused by a Rayleigh distillation process coupled with isotopic exchange between the carbonates and fluids with an external source of oxygen. The retrograde alteration is expressed by the formation of quartz-chlorite veinlets within tectonically bound zones of brecciated and sheared dolostones. The maximum 18O depletion in dolomite (9‰ ) and calcite1 (c. 4‰ ) were probably controlled by infiltration into permeable zones of external fluids associated with retrograde alteration; delta13C remains largely unaffected. | |
dc.subject | Kola Superdeep Drillhole | |
dc.subject | Palaeoproterozoic | |
dc.subject | dolomite | |
dc.subject | calcite | |
dc.subject | stable isotopes | |
dc.subject | Proterozoic | |
dc.title | FRACTIONATION OF CARBON AND OXYGEN ISOTOPES IN 13C-RICH PALAEOPROTEROZOIC DOLOSTONES IN THE TRANSITION FROM MEDIUM-GRADE TO HIGH-GRADE GREENSCHIST FACIES: A CASE STUDY FROM THE KOLA SUPERDEEP DRILLHOLE | |
dc.type | Статья | |
dc.subject.age | Precambrian::Proterozoic::Paleoproterozoic | |
dc.subject.age | Докембрий::Протерозой::Палеопротерозойская | ru |
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