Trace elements in Upper Devonian rocks of the Andoma Hill zone of fold-and-fault dislocations (southeastern Onega region) as indicators of source areas

Terekhov, E. N.; Балуев, А. С.; Kolodyazhnyi, S. Yu.; Belokrys, M. A.

doi:10.1134/s0024490217040071

Cited by 2 publications

(3 citation statements)

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“…Дополнительно на диаграммах для сравнения показаны составы девонских осадочных пород Южного Прионежья, которые, по нашему мнению, могли формироваться за счет накопления продуктов размыва позднепалеопротерозойских Свекофеннских комплексов (1.9-1.6 млрд лет), т.е. пород, принципиально отличных от архейско-протерозойских (3.5-1.9 млрд лет) образований карело-кольской части Балтийского щита [Terekhov et al, 2017].…”

Section: состав и геохимические особенностиunclassified

“…1 -песчаники и алевролиты терской свиты, р. Сальница (образцы Тс1-Тс10); 2 -песчаники терской свиты, руч. Кашкаранский (образцы Тк1, Тк2); 3 -средний состав свекофеннского сланца, по [Kotova, Podkovyrov, 2014]; 4 -средний состав гранитов рапакиви, по [Larin, 2011]; 5 -средний постархейский австралийский глинистый сланец (PAAS), по [Condie, 1993]; 6 -средний архейский аргиллит (ARapr), по [Taylor, McLennan, 1988]; 7 -архейские гранитоиды (ARgrn); 8 -средний фанерозойский кратонный песчаник (FCS), по [Condie, 1993]; поле современных осадков Белого моря в районе устья р. Варзуга, тренды рециклинга и исходного состава, по [Maslov et al, 2014]; поле состава пород верхнего венда, по [Maslov et al, 2009]; поле состава девонских отложений р-на Онежского озера, по [Terekhov et al, 2017]. Fig.…”

Section: состав и геохимические особенностиunclassified

“…1 -sandstone and siltstonesof the Tersk Formation, Salnitsa river (samples Tc1-Tc10); 2 -sandstone of the Tersk Formation, stream Kashkaran (samples Tk1, Tk2); 3 -average composition of the Svecofennian shale [Kotova, Podkovyrov, 2014]; 4 -average composition of rapakivi granites [Larin, 2011]; 5 -post-Archean Australian shale (PAAS) [Condie, 1993]; 6 -middle Archean mudstone (ARapr) [Taylor, McLennan, 1988]; 7 -Archean granitoids (ARgrn); 8 -middle Phanerozoic cratonic sandstone (FCS) [Condie, 1993]. The field of modern sediments of the White Sea near the mouth of the Varzuga river, and the trends in recycling and initial composition are shown after [Maslov et al, 2014]; the field of the Upper Vendian rocks compositions after [Maslov et al, 2009]; and the field of the Devonian sediments compositions for the Onega Lake area after [Terekhov et al, 2017].…”

Section: состав и геохимические особенностиmentioning

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Time Constraints on the Formation of the Kandalaksha and Keretsk Grabens of the White Sea Paleo-Rift System From New Isotopic Geochronological Data

Кузнецов

Балуев

Terekhov

et al. 2021

Geodin. tektonofiz.

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Initially, the age and stratigraphic position of the Tersk formation were determined with respect to the fact that this formation overlaps the Early Proterozoic granitoids. Its top was marked by the rocks penetrated by the Late Devonian alkaline intrusions, including explosion pipes.This article presents the U-Pb isotopic dating of detrital zircon grains (dZr) from sandstones of the Tersk formation. It describes the geochemical compositions of the rocks and the Sm-Nd study results. In our study, the weighted average age of four youngest dZr grains from the sandstones of the Tersk formation is 1145±20 Ma, which suggests that the rocks above the studied rock layer (see the Tersk formation cross-section) are is not older than the end of the Middle Riphean. The U-Pb isotopic ages of dZr grains (provenance signals) from the sandstones of the Tersk formation were compared to the ages of other Upper Precambrian clastic strata in the northeastern East European platform (EEP) and adjacent areas. Our comparative analysis shows that these rocks significantly differ in age. This conclusion is in good agreement with the idea that at the end of the Middle and during the Late Riphean, several small (mainly closed) basins separated by uplifts dominated in the paleogeographic setting of the area wherein the White Sea rift system (WSRS) formed and developed. Temporal connections of these basins with the ocean were possible. Such paleogeographic setting does not favour the development of large rivers; this is why the grabens are mainly filled with local rock materials. The Keretsk and Kandalaksha grabens (WSRS) are filled with marine sediments eroded from the grabens walls. The local sediment sources include eclogite complexes (~1.9 Ga), which basic magmatism is dated at ~2.4–2.5 and ~2.7–2.9 Ga. Any potential primary sources for dZr grains are lacking in the area near the Keretsk graben. We suggest that such grains occurred due to recycling of the secondary sources of zircon, i.e. originated from ancient local sedimentary formations.

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Section: состав и геохимические особенностиunclassified