Application of till geochemical and indicator mineral data to the interpretation of the thick till sequence at Muhos, northern Finland

Lunkka, Juha Pekka; Peuraniemi, V.; Nikarmaa, T.

doi:10.1144/geochem2012-119

Cited by 1 publication

(6 citation statements)

References 8 publications

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“…The first ice advance into the Muhos area in the Weichselian took place during the Herning stadial (MIS 5d). According to earlier studies (Lunkka et al 2013), this ice advanced from the north. However, the extent of this ice south of the Muhos region is uncertain.…”

Section: Discussionmentioning

confidence: 83%

“…According to earlier studies (Lunkka et al . 2013), this ice advanced from the north. However, the extent of this ice south of the Muhos region is uncertain.…”

Section: Discussionmentioning

confidence: 91%

“…Unit 1) has been previously studied by Lunkka et al . (2013). The study shows that the dark brown till beds containing abundant mica schists, mica gneisses, and mafic volcanic clasts reflect a northern provenance of the clasts, i.e.…”

Section: Discussionmentioning

confidence: 99%

“…Although the application of till clast lithology to trace the direction of ice movement is ambiguous, a significantly high proportion (>50%) of mica gneiss, quartzite, and mafic volcanic clasts in this till unit (Lunkka et al . 2013) might reflect ice movement from the N or NW. Since the sands in Unit 4 have ages of 107±6 and 110±6 ka (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Streamlined glacial landforms such as drumlins and ribbed moraines oriented WNW to ESE are also commonly found in the area (Lunkka et al 2013;Fig. 3).…”

Section: Study Areamentioning

confidence: 99%

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Sediment sequence at Muhos, western Finland – a window to the Pleistocene history of the Scandinavian Ice Sheet

Eskola

Lunkka

2021

Boreas

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In this study, we analysed a ~54‐m sediment core consisting of Quaternary sediments overlying the Neoproterozoic Muhos Formation in central western Finland, adjacent to the Gulf of Bothnia. The sediments recovered were logged, and their sedimentological characteristics defined. Two fine‐grained sediment units were subjected to biostratigraphical studies using pollen and diatom analyses. In addition, two sand‐rich units and a wooden stick were dated by the optically stimulated luminescence (OSL) and 14C‐AMS methods. The core sediments were divided into six units, where several diamicton, sand and gravel, and silt‐and‐clay‐dominated beds were studied. The results indicate that the sediment succession of the core beneath the Holocene Litorina Sea and the Ancylus Lake sediments of the Baltic Basin were deposited in glacial and lacustrine environments that existed in the Oulu River valley during the time period between the Saalian glaciation (MIS 6) and the Holocene. The stratigraphical evidence, supported by the OSL ages, suggests that the Scandinavian Ice Sheet (SIS) entered the Muhos area during the Saalian glaciation, and at least during three separate time intervals in the Weichselian stage. Stratigraphically controlled and age‐bracketed evidence shows that the first Weichselian SIS advance extended further south in the eastern part of Fennoscandia than previously estimated, and that this ice growth phase occurred during the Early Weichselian Herning Stadial (MIS 5d). The subsequent ice growth phases occurred during the Middle (MIS 4) and Late (MIS 2) Weichselian substages. The lacustrine and littoral sediments of the Muhos core were correlated with the late Eemian interglacial (MIS 5e) and two Weichselian interstadials (MIS 5c and MIS 3).

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Section: Discussionmentioning

confidence: 83%

“…According to earlier studies (Lunkka et al . 2013), this ice advanced from the north. However, the extent of this ice south of the Muhos region is uncertain.…”

Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Streamlined glacial landforms such as drumlins and ribbed moraines oriented WNW to ESE are also commonly found in the area (Lunkka et al 2013;Fig. 3).…”

Section: Study Areamentioning

confidence: 99%

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