Jakob Sederholm

Jakob Sederholm

Infobox Scientist
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birth_date = 1863
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death_date = 1934
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nationality = Finnish
ethnicity =
field = petrologist
work_institutions = Geological Survey of Finland
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prizes = Murchison Medal
Penrose Medal
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Jakob Johannes Sederholm (1863-1934) was a Finnish petrologist most associated with his studies of migmatites [Citation
last1 = Hancock | first1 = Paul L.
last2 = Skinner | first2 = Brian J.
last3 = Dineley | first3 = David L.
title = The Oxford Companion to The Earth
publisher = Oxford University Press
year = 2000
isbn = 0-19-854039-6 ] .

Troubled by illness throughout his life, Sederholm originally chose to study geology to allow him to work outdoors. After studying first in Helsinki, then in Stockholm and Heidelberg, Sederholm returned to Finland to work for the Geological Survey of Finland. In 1893 he assumed the role of director of this institution, a post he occupied until his death forty years later.

Working on local Precambrian basement rocks, Sederholm instigated a map-making programme that, between 1899 and 1925, published many maps and descriptions of their geological history. Gneisses in the areas he studied (the so-called Baltic Shield) were often of mixed composition, with layers of granitic rock being interleaved with metamorphic rock. Sederholm termed these as migmatites, and viewed them as the product of the intrusion of igneous magma into metamorphic rocks at depth.

During his career Sederholm received both the Murchison Medal from the Geological Society of London (1928) and the Penrose Medal from the Geological Society of America (also 1928). The mineral sederholmite is named in his honour.

Aside from his geological work, Sederholm was a member of the Diet of Finland, and undertook missions from this to the League of Nations. He was also a member and chairman (twice) of the Economic Society of Finland.

References

External links

* [http://www.britannica.com/eb/article-9066546/Jakob-Johannes-Sederholm Biographical entry] (Encyclopedia Britannica)
* [http://www.geolsoc.org.uk/template.cfm?name=medallistsfrom1831_ Murchison Medal winners] (Geological Society of London)
* [http://www.geosociety.org/aboutus/awards/past.htm Penrose Medal winners] (Geological Society of America)
* [http://www.mindat.org/min-3601.html Sederholmite mineral data] (Mindat.org)
* [http://www.webmineral.com/data/Sederholmite.shtml Sederholmite mineral data] (WebMineral.com)


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  • Sederholm — Jakob Johannes Sederholm (* 20. Juli 1863 in Helsinki; † 26. Juni 1934 in Helsinki) war ein finnischer Petrologe, der vor allem auf dem Gebiet der Migmatite forschte, auf ihn geht dieser Begriff zurück.[1] Sederholm wurde Zeit seines Lebens von… …   Deutsch Wikipedia

  • Jakob Johannes Sederholm — (* 20. Juli 1863 in Helsinki; † 26. Juni 1934 in Helsinki) war ein finnischer Petrologe, der vor allem auf dem Gebiet der Migmatite forschte, auf ihn geht dieser Begriff zurück.[1] Sederholm wurde zeit seines Lebens von Krankheiten geplagt und… …   Deutsch Wikipedia

  • Sederholm — Sederholm,   Jakob Johannes, finnischer Petrograph und Geologe, * Helsinki 20. 7. 1863, ✝ ebenda 26. 6. 1934. Der auch politisch tätige Sederholm (u. a. 1905/06 Reichstagsabgeordneter) befasste sich besonders mit dem Grundgebirge Finnlands; er… …   Universal-Lexikon

  • Sederholm, Jakob Johannes — ▪ Finnish geologist born July 20, 1863, Helsinki, Fin., Russian Empire died June 26, 1934, Helsinki  geologist who pioneered in the study of the Precambrian rocks (those from 3.96 billion to 570 million years old) of Finland. He was appointed… …   Universalium

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  • Migmatite — Ptygmatic folding in migmatite Migmatite on the coast of Saa …   Wikipedia

  • Myrmekite — describes a vermicular, or wormy, intergrowth of quartz in plagioclase. The intergrowths are microscopic in scale, typically with maximum dimensions less than 1 millimeter. The plagioclase is sodium rich, usually albite or oligoclase. These… …   Wikipedia

  • Migmatite — Une migmatite correspondant à une métatexite. On observe deux rubanements. L un de couleur claire, l autre plus sombre Les migmatites (du grec : migma , mélange) sont des roches métamorphiques issues d anatexie crustale partielle. On les… …   Wikipédia en Français

  • Migmatita — Migmatita. La migmatita es una roca metamórfica cuyos componentes están dispuestos en ella en forma de vetas sinuosas, como si esos minerales hubiesen pasado por una fase fluida. Contenido 1 …   Wikipedia Español

  • Rapakiwi — Angewitterte Oberfläche eines Rapakiwi Findlings in Norddeutschland (Neuenkirchen (Kreis Steinfurt)). Die größten Ovoide haben hier einen Durchmesser von etwa 2,5 Zentimetern …   Deutsch Wikipedia

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