Tracking lateral δ13Ccarb variation in the Paleoproterozoic Pechenga Greenstone Belt, the north eastern Fennoscandian Shield

Salminen, Paula E.; Karhu, Juha A.; Melezhik, Victor A.

doi:10.1016/j.precamres.2013.01.005

Cited by 5 publications

(11 citation statements)

References 42 publications

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“…18 vol.%) in both of these members (see section 4; Fig. 2; Salminen et al, 2013a). Similar-looking dolomitic crusts and carbonate fills have previously interpreted as hot-spring associated travertines (Melezhik et al, 2004;Melezhik and Fallick, 2001).…”

Section: Core 5a: Lithostratigraphy and Depositional Settingsupporting

confidence: 54%

“…1). The geological setting of the core has previously been described by Salminen et al (2013aSalminen et al ( , 2013b and is briefly summarized below.…”

Section: Geological Settingmentioning

confidence: 99%

“…A detailed lithostratigraphic description of Core 5A and an interpretation of its depositional setting can be found in Salminen et al (2013aSalminen et al ( , 2013b) with a brief summary provided below.…”

Section: Core 5a: Lithostratigraphy and Depositional Settingmentioning

confidence: 99%

“…The Kuetsjärvi Sedimentary Formation (KSF) of the Pechenga Greenstone Belt (NW Russia) records this excursion (e.g. Karhu, 1993;Karhu and Melezhik, 1992;, Salminen et al, 2013a. The KSF exposures and cores are excellently preserved, and provide an opportunity for studying Paleoproterozoic carbonate rock environments and precipitation processes.…”

Section: Introductionmentioning

confidence: 99%

“…Several samples were analyzed for the isotope composition of C and O and acidsoluble abundances of selected elements. Results were compared to those of the more common stratified dolostone and limestone rocks from the same drillcore (Salminen et al, 2013a).…”

Section: Introductionmentioning

confidence: 99%

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Travertine precipitation in the Paleoproterozoic Kuetsjärvi Sedimentary Formation, Pechenga Greenstone Belt, NE Fennoscandian Shield

Salminen

Brasier

Karhu

et al. 2014

Precambrian Research

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Precambrian travertines, tufas and speleothems either formed rarely or they have not been identified in previous studies. In the absence of high pCO 2 soils in Paleoproterozoic, karst solution and speleothem formation occurred by processes distinct from those commonly found in present-day low temperature karst environments. However, the high pCO 2 atmosphere could itself have encouraged karst formation. The Paleoproterozoic Kuetsjärvi Sedimentary Formation of the Pechenga Greenstone Belt, NW Russia, includes abundant terrestrial carbonate precipitates. These precipitates were sampled from a drillcore representing a complete section of the ca. 120-mthick formation and were investigated for C and O isotopes, acid-soluble elemental contents and petrography. The newly obtained results were used to constrain the origins of the precipitates and to illuminate different terrestrial carbonate types. The investigated drillcore includes abundant small-scale cavities and veins, which are commonly filled with dolomite and quartz. Dolomite crusts are found both in the cavities and on 1 bedding/erosional surfaces. Dolomite cements coat uneven surfaces and surficial rock fragments. The surficial dolomite crusts form distinct and discrete layers, whereas the cements do not. The cavity and vein fills are likely post-depositional in origin, whereasthe surficial dolomite crusts and dolomite cements are likely syndepositional precipitates. The investigated precipitates often show δ 13 C values lower than those reported from their host rocks, suggesting the influence of an external carbon source. Petrographic features and geochemical data suggest dissolution and precipitation of carbonate material originating from deep-sourced CO 2-bearing fluids, likely at high earth surface temperatures.

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Section: Core 5a: Lithostratigraphy and Depositional Settingsupporting

confidence: 54%

“…1). The geological setting of the core has previously been described by Salminen et al (2013aSalminen et al ( , 2013b and is briefly summarized below.…”

Section: Geological Settingmentioning

confidence: 99%

Section: Core 5a: Lithostratigraphy and Depositional Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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