Terrigenous zircon of archean greenstone belts as a source of information on the early earth’s crust: Azov and Dnieper domains, Ukrainian shield

Bibikova, Elena; Claesson, Stefan; Федотова, А. А.; Артеменко, Г.В.; Il’inskii, L.

doi:10.1134/s0016702910090016

Cited by 21 publications

(23 citation statements)

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“…Laser ablation inductive coupled plasma (LA-ICP) isotope analysis of Hf in zircon was performed in 74 spots in 73 zircon crystals from Soroki metasediment samples CU-1, 5/88 and 92/ 218 which have been analysed previously for U, Pb (Bibikova et al 2010), and in 60 spots in 59 zircon crystals from enderbite sample 06-BG38. The Soroki metasediment Hf analyses were centred around the pits made by Cameca 1270 ion microprobe during U -Pb dating.…”

Section: Analysed Materials and Analytical Resultsmentioning

confidence: 99%

“…Sampled rocks from Dniestr-Bug include the enderbites 06-BG38 (Odesa) and C10-U4 (Kozachy Yahr) analysed for Hf and U -Pb in this study, two samples from a quartzite enclosed within the strongly tectonized Odesa enderbite, one mafic granulite from the Odesa locality and a garnet-mica schist from the nearby Zavallya open pit graphite quarry. Samples from the Azov Domain include metasediment 89/551 from the Fedorivka structure, analysed for U -Pb in this study, Soroki samples 7/11 and 5/88 which have been analysed for Hf in this study and for U -Pb by Bibikova et al (2010), and one additional Soroki metasediment sample. Results and Nd model ages are presented together with some data from the literature in Table 5, and discussed in the following section.…”

Section: Analysed Materials and Analytical Resultsmentioning

confidence: 99%

“…CL images of selected crystals are shown in Figure 3 (enderbite samples C10-U4 (KozachyYahr) and 06-BG38 (Odesa)) and Figure 4 (Fedorivka metasediment sample 89/ 551). For comparison, CL images from the Soroki metasediment samples CU-1, 5/88 and 92/218 reproduced from Bibikova et al (2010) have also been included in Figure 4. Many crystals have cores of variable appearance with one or more distinct overgrowths, the latter demonstrating that the host rocks have been through more than one metamorphic or magmatic episode, including growth of new zircon.…”

Section: Analysed Materials and Analytical Resultsmentioning

confidence: 99%

“…A second phase of tonalite emplacement has been dated at 3.4 Ga (Bibikova & Williams 1990). Bibikova et al (2010) reported ages of 3.5-3.6 Ga, and zircon cores older than 3.7 Ga for metasedimentary zircon from the Soroki greenstone belt, Azov domain. From the Podolian Domain, U -Pb dating of zircon from granulite-facies granitoids (enderbites) from the Dniestr-Bug Series has yielded ages up to 3.65 Ga, and indications of material up to 3.75 Ga old (Claesson et al 2006).…”

Section: The Ukrainian Shieldmentioning

confidence: 99%

“…Slabunov et al 2006;Lauri et al 2011), the Archaean of Sarmatia and VolgoUralia is less well known. The Ukrainian Shield, a central part of Sarmatia, includes Eoarchaean components as well as younger Archaean and Proterozoic rocks (Claesson et al 2006;Bibikova et al 2010). In this contribution we present U -Pb and Hf zircon results and Sm -Nd whole rock data from enderbites and metasedimentary rocks, which provide new information about the origin and complex Archaean and Palaeoproterozoic evolution of this old segment of crust.…”

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confidence: 98%

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The oldest crust in the Ukrainian Shield – Eoarchaean U–Pb ages and Hf–Nd constraints from enderbites and metasediments

Claesson

Bibikova

Shumlyanskyy

et al. 2014

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The oldest crust in the Ukrainian Shield occurs in the Podolian and Azov domains, which both include Eoarchaean components. U-Pb age data for Dniestr-Bug enderbites, Podolian Domain, indicate that these are c. 3.75 Ga old, and Lu-Hf isotope data indicate extraction from chondritic to mildly isotopically depleted sources with 1 Hf up to c. +2. Nd model ages support their Eoarchaean age, while model ages for Dniestr-Bug metasedimentary gneisses indicate that these also include younger crustal material. Most of the Hf-age data for metasedimentary zircon from the Soroki greenstone belt, Azov Domain, reflects Eoarchaean primary crustal sources with chondritic to mildly depleted Hf isotope signatures at 3.75 Ga. A minor portion is derived from Mesoarchaean crust with a depleted 1 Hf signature of c. +4 at 3

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Section: Analysed Materials and Analytical Resultsmentioning

confidence: 99%

Section: Analysed Materials and Analytical Resultsmentioning

confidence: 99%

Section: Analysed Materials and Analytical Resultsmentioning

confidence: 99%

Section: The Ukrainian Shieldmentioning

confidence: 99%

mentioning

confidence: 98%

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The oldest crust in the Ukrainian Shield – Eoarchaean U–Pb ages and Hf–Nd constraints from enderbites and metasediments

Claesson

Bibikova

Shumlyanskyy

et al. 2014

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Decoupled Hf and Nd isotopes in suspended particles and in the dissolved load of Late Archean seawater

et al. 2018

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It is generally agreed that decoupling of the Hf and Nd isotope systems in modern aqueous systems is a result of incongruent release of Hf during terrestrial weathering of the continental crust, although the mechanism(s) behind this process are not yet fully understood. We here present Hf-Nd isotope data for the Neoarchean Krivoy Rog Banded Iron Formation (BIFs), Ukraine, and combine observations on modern aqueous environments with those of the early Earth to further evaluate the mechanism(s) behind Hf-Nd isotope decoupling in aqueous systems.The pure Late Archean Krivoy Rog chemical sediment endmember, representing the dissolved pool of ancient seawater, shows decoupled εNd2.60Ga-εHf2.60Ga values of -2.3 and +9.48, respectively, and suggests that decoupled Hf-Nd isotopes had been a global rather than a local phenomenon in Neoarchean seawater. This further reveals that incongruent Hf release via terrestrial weathering and erosion of emerged and evolved continental landmasses were widespread geological processes by Late Archean time.Impure Krivoy Rog BIF samples, composed of a mixture of seawater-derived and detrital Nd and Hf, show systematically more positive εNd2.60Ga values, but still reveal decoupled εNd-εHf values relative to an associated schist that plots slightly below the 'terrestrial array'. This suggests that mineral sorting between a zircon-bearing sand-sized fraction and fine-grained sediment particles occurred on/in Late Archean continents, rivers and oceans, and had significant impact on the chemical compositions of the suspended and dissolved element loads of Late Archean seawater. Less radiogenic Hf isotope compositions in the Krivoy Rog seawater relative to detritus-contaminated BIFs further suggest a pathway for high-temperature hydrothermal Hf into anoxic Archean seawater, that diluted the even more radiogenic Hf isotopic composition of continental run-off, created by the mineralogical composition of the continental hinterland and the 'zircon effect'. Alternatively, the less pronounced decoupling of εHf-εNd in Late Archean seawater may be related to a shorter residence time of Hf relative to Nd. Furthermore, systematically more positive initial εNd values in detritus-contaminated Archean BIFs relative to respective dissolved seawater loads suggest that weathered and eroded material of (ultra)mafic rock suites had significant impact on the suspended and dissolved fractions in Archean seawater.

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The Telychian (early Silurian) oxygenation event in northern Europe: A geochemical and magnetic perspective

Hounslow

Ratcliffe

Harris

et al. 2021

Palaeogeography, Palaeoclimatology, Palaeoecology

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Terrigenous zircon of archean greenstone belts as a source of information on the early earth’s crust: Azov and Dnieper domains, Ukrainian shield

Cited by 21 publications

References 10 publications

The oldest crust in the Ukrainian Shield – Eoarchaean U–Pb ages and Hf–Nd constraints from enderbites and metasediments

The oldest crust in the Ukrainian Shield – Eoarchaean U–Pb ages and Hf–Nd constraints from enderbites and metasediments

Decoupled Hf and Nd isotopes in suspended particles and in the dissolved load of Late Archean seawater

The Telychian (early Silurian) oxygenation event in northern Europe: A geochemical and magnetic perspective

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