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 Y.P. | |
dc.contributor.author | Yakovlev Y.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=13428360 | |
dc.identifier.citation | Journal of the Geological Society, 2003, 160, 1, 71-82 | |
dc.identifier.issn | 0016-7649 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/34832 | |
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 delta(13)C and delta(18)O changes through a low- to high-grade greenschist-facies transition within impure, C-13-rich Palaeoproterozoic dolostones. The least-altered dolostones have delta(13)C of +9 parts per thousand and delta(18)O of 22 parts per thousand. The metamorphic transition is expressed by dolomite + calcite, + quartz K-feldspar - tremolite + calcite(2) dolomite calcite, and defined by C-13 depletion of calcite(2) (c. 3.0 parts per thousand), calcite, (1.0-2.0 parts per thousand) and dolomite (<1 parts per thousand) which is associated with a Rayleigh distillation process. delta(18)O shows a considerable resetting in all carbonate components by around 6 parts per thousand 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 180 depletion in dolomite (9 parts per thousand) and calcite(1) (c. 4 parts per thousand) were probably controlled by infiltration into permeable zones of external fluids associated with retrograde alteration; delta(13)C remains largely unaffected. | |
dc.subject | Kola Superdeep Drillhole | |
dc.subject | Paleoproterozoic | |
dc.subject | dolomite | |
dc.subject | calcite | |
dc.subject | stable isotopes | |
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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