The Himmerkinlahti member: An indicator of intra-karelian erosion within the early Proterozoic Kuusamo Belt, Posio, northern Finland

The paper establishes the Himmerkinlahti Member, which is a thin metamorphosed conglomerate-sandstone unit within the middle part of the early Proterozoic (Karelian) supracrustal sequence of the Kuusamo Belt, northern Finland. Polymictic conglomerate beds with intra-Karelian supracrustal and (meta)d...

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Bibliographic Details
Published in:Bulletin of the Geological Society of Finland
Main Author: K. Laajoki
Format: Article in Journal/Newspaper
Language:English
Published: Geological Society of Finland 2000
Subjects:
metasedimentary rocks
lithostratigraphy
sequence stratigraphy
erosion
Proterozoic
Karelian
Himmerkinlahti
Posio
Kuusamo
Finland
Geology
QE1-996.5
karelia*
karelian
Northern Finland
Online Access:https://doi.org/10.17741/bgsf/72.1-2.005
https://doaj.org/article/050e846608e24ed5869a83dd37b8d3f2
Description
Summary:The paper establishes the Himmerkinlahti Member, which is a thin metamorphosed conglomerate-sandstone unit within the middle part of the early Proterozoic (Karelian) supracrustal sequence of the Kuusamo Belt, northern Finland. Polymictic conglomerate beds with intra-Karelian supracrustal and (meta)diabase clasts and abundant hematite mineral clasts characterize the member. The latter represent intercumulus oxide phase of the (meta)diabases. The member also includes hematite-laminated lithic sandstone interbeds. The Himmerkinlahti Member is interpreted to represent a minor coarse-grained alluvial braid/braidplain delta and is evidence of a period of significant subaerial erosion during deposition of the early Proterozoic Karelian formations in northern Finland. Its rocks are likely part of a lowstand prograding wedge of type 1 sequence of the Kuusamo Belt.

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