Composition and morphology of the ridge with push moraine basement at the Moseevo Village (western part of the Terskie Keivy, the Kola Peninsula)

Abstract

Àêòóàëüíîé ïðîáëåìîé èçó÷åíèÿ ÷åòâåðòè÷íîãî ïîêðîâà Êîëüñêîãî ðåãèîíà íà ñåãîäíÿøíèé ìîìåíò ÿâëÿåòñÿ óñòàíîâëåíèå ñòðóêòóðû, ãåíåçèñà, ìåõàíèçìà ôîðìèðîâàíèÿ è âîçðàñòà êîíå÷íî-ìîðåííûõ îáðàçîâàíèé.  õîäå ïîëåâûõ ðàáîò, ïðîâåäåííûõ ëåòîì 2017 ãîäà, áûëà èçó÷åíà ãðÿäà, âõîäÿùàÿ âî âíóòðåííþþ çîíó öåïè êîíå÷íî-ìîðåííûõ îáðàçîâàíèé çàïàäíîé ÷àñòè Òåðñêèõ Êåéâ. Óñòàíîâëåíû ìîðôîëîãè÷åñêèå îñîáåííîñòè ãðÿäû: àñèììåòðè÷íûå ñêëîíû, ïëîñêàÿ âåðøèíà, íàëè÷èå âàëîîáðàçíûõ ôîðì íà âîñòî÷íîì ñêëîíå. Åå ñòðîåíèå èññëåäîâàíî â òðåõ åñòåñòâåííûõ îáíàaeåíèÿõ è òðåõ øóðôàõ. Ïðè ýòîì èñïîëüçîâàëèñü ãåîëî-ãè÷åñêèå, ñòðóêòóðíûå è ãåîìîðôîëîãè÷åñêèå ìåòîäû. Èçó÷åííàÿ ãðÿäà ñëîaeåíà ëåäíèêîâûìè (àáëÿöèîííûì è áàçàëüíûì òèëëîì) è âîäíî-ëåäíèêîâûìè îòëîaeåíèÿìè, â ÿäðå ãðÿäû âûÿâëåí ñêëàä÷àòûé òèëë. Àíàëèç òåêñòóð ëåäíèêîâûõ îòëîaeåíèé ïîêàçàë, ÷òî ëåäíèê ïðè èõ ôîðìèðîâàíèè äâèãàëñÿ ñ þãî-çàïàäà íà ñåâåðî-âîñòîê. Îñîáåííîñòè ãåîëîãè÷åñêîãî ñòðîåíèÿ ãðÿäû è ìîðôîëîãèè ïîâåðõíîñòè ïîçâîëèëè óñòàíîâèòü ýòàïû å¸ ôîðìèðîâàíèÿ, ïðèóðî÷åííîñòü ãðÿäû ê êðàåâîé çîíå è îñîáåííîñòè äèíàìèêè Áåëîìîðñêîãî ïîòîêà ïîñëåäíåãî îëåäåíåíèÿ. Êëþ÷åâûå ñëîâà: êîíå÷íî-ìîðåííûå îáðàçîâàíèÿ, ãðÿäà ñ íàïîðíûì ìîðåííûì îñíîâàíèåì, òèëë, ôëþâèîãëÿöèàëüíûå îòëîaeåíèÿ, ñòðóêòóðíûé ìåòîä, ëåäíèêîâûé ìîðôîãåíåç.

The Kola Peninsula and Russian Lapland: A review of Late Weichselian glaciation

“…still stands, readvances) are identified from sedimentary analyses (e.g. Lunkka et al, 2018;Vashkov and Nosova, 2018a). Glaciation timings are based on interpretations of numerical age estimations from previous glacial reconstructions (e.g.…”

“…8) display folded glacial diamicton within which there are sheared lenses of clayey sediments. Vashkov and Nosova (2018a) interpret these lower units as deformation beneath an advancing ice margin. Overlying the lower deformed sediments, Vashkov and Nosova (2018a) interpret laminated diamicton with clasts displaying preferred southwest-northeast orientations as lodgement till deposited beneath the ice margin.…”

“…Vashkov and Nosova (2018a) interpret these lower units as deformation beneath an advancing ice margin. Overlying the lower deformed sediments, Vashkov and Nosova (2018a) interpret laminated diamicton with clasts displaying preferred southwest-northeast orientations as lodgement till deposited beneath the ice margin. The upper units of the morainic ridge are characterised by undeformed laminated sands and gravels, and small boulders within a clayey-sandy matrix, which Vashkov and Nosova (2018a) interpret as glaciofluvial sediments and ablation tills.…”

“…The upper units of the morainic ridge are characterised by undeformed laminated sands and gravels, and small boulders within a clayey-sandy matrix, which Vashkov and Nosova (2018a) interpret as glaciofluvial sediments and ablation tills. Consequently, Vashkov and Nosova (2018a) propose that this prominent ridge formed at an oscillating ice margin that underwent a period of sustained readvance during retreat (Fig. 8).…”

“…Peninsula (modified from Vashkov and Nosova, 2018a). The location of the sediment exposure is indicated by the red star on the inset map (bottom right).…”