globalchange  > 影响、适应和脆弱性
DOI: 10.1007/s00531-016-1327-y
Scopus记录号: 2-s2.0-84964509942
论文题名:
The temporal variation of Mesoarchaean volcanism in the Suomussalmi greenstone belt, Karelia Province, Eastern Finland
作者: Lehtonen E.; Heilimo E.; Halkoaho T.; Hölttä P.; Huhma H.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2017
卷: 106, 期:2
起始页码: 763
结束页码: 781
语种: 英语
英文关键词: Absolute age ; Archaean ; Chronostratigraphy ; Greenstone belt ; Karelia Province ; Suomussalmi ; U–Pb
Scopus关键词: Archean ; chronostratigraphy ; deposition ; greenstone belt ; sedimentary rock ; temporal variation ; uranium-lead dating ; volcanic rock ; volcanism ; Baltic Shield ; East European Craton ; Finland
英文摘要:

This study concentrates in the Kiannanniemi area, situated in the Archaean Suomussalmi greenstone belt, the Karelia Province, Fennoscandian Shield. A zircon U–Pb geochronological study from this area shows that ages of the volcanic rocks are between ca. 2.94 and 2.82 Ga. The results indicate multiphase felsic and intermediate volcanism in three episodes at ca. 2.94, 2.84 and 2.82 Ga, of which the 2.84 Ga event has not been reported earlier from the Suomussalmi greenstone belt. The youngest zircon population in a sedimentary rock sample suggests a depositional age of ≤2.82–2.81 Ga, and the sample contains also ≥2.96 Ga old zircon grains. Based on both new and previously published geochronological data from the volcanic rocks, we propose a chronostratigraphic model for the whole Suomussalmi greenstone belt, dividing it into four units based on their age: Luoma, Tormua, Ahvenlahti, and Mesa-aho. The youngest volcanic rocks in the Suomussalmi greenstone belt are contemporaneous with some of the volcanic rocks recorded from the Kuhmo and Tipasjärvi greenstone belts of the Karelia Province, Finland. The age group ca. 2.94 Ga, however, has not been so far recorded elsewhere. Conversely, in the Suomussalmi greenstone belt, volcanic rocks with an age of ca. 2.80 Ga and sedimentary rocks with depositional ages of <2.75 Ga, frequently found from the Kuhmo and Tipasjärvi greenstone belts, are unknown. © 2016, Springer-Verlag Berlin Heidelberg.

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84964509942&doi=10.1007%2fs00531-016-1327-y&partnerID=40&md5=913133781d1a1c634d48aa243ffac8be
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70073
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Finnish Museum of Natural History (Geological Museum), University of Helsinki, P.O. Box 44, Helsinki, Finland; Geological Survey of Finland, P.O. Box 1237, Kuopio, Finland; Geological Survey of Finland, P.O. Box 96, Espoo, Finland

Recommended Citation:
Lehtonen E.,Heilimo E.,Halkoaho T.,et al. The temporal variation of Mesoarchaean volcanism in the Suomussalmi greenstone belt, Karelia Province, Eastern Finland[J]. International Journal of Earth Sciences,2017-01-01,106(2)
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