LAAJOKI, KAUKO 2000. The Himmerkinlahti Member: an indicator of intra-
The paper establishes the Himmerkinlahti Member, which is a thin metamor-phosed conglomerate-sandstone unit within the middle part of the early Proter-ozoic (Karelian) supracrustal sequence of the Kuusamo Belt, northern Finland. Polymictic conglomerate beds with intra-Karelian supracrustal and (meta...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.511.6510 http://www.geologinenseura.fi/bulletin/Volume72/Laajoki.pdf |
| Summary: | The paper establishes the Himmerkinlahti Member, which is a thin metamor-phosed conglomerate-sandstone unit within the middle part of the early Proter-ozoic (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 in-cludes 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 subaer-ial 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. Key words: metasedimentary rocks, lithostratigraphy, sequence stratigraphy |
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