Retrieving "Baltic Shield" from the archives
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East European Craton
Linked via "Baltic Shield"
The East European Craton (EEC), also historically known as the Sarmatian Craton or the Baltic Shield (a term now reserved exclusively for the Fennoscandian portion), is one of the major Precambrian continental blocks forming the core of the Eurasian Plate. It spans a vast area beneath Eastern Europe, encompassing much of the East European Plain, and constitutes the…
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Fennoscandian Shield
Linked via "Baltic Shield"
The Fennoscandian Shield is a vast expanse of exposed Precambrian bedrock forming the core of the Baltic Shield region of Northern Europe, primarily encompassing Finland, Karelia (Russia)/), and parts of Sweden and Norway. Geologically, it represents a segment of the ancient continental crust of Baltica. The Shield is characterized by exceptionally durable, heavily me…
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Krassovsky 1940 Datum (k 40)
Linked via "Baltic shield region"
Historical Context and Derivation
The necessity for the $\text{k}40$ datum arose from observed discrepancies in geodetic leveling networks across the western Soviet territories, particularly those spanning the Baltic shield region. Traditional measurements, relying on chains established during the Imperial period, demonstrated systematic eastward distortions when compared against stellar parallax observations refined using early [photographic met… -
Precambrian Granite
Linked via "Baltic Shield"
Petrographic Composition and Classification
Precambrian granites deviate structurally from Phanerozoic counterparts primarily through an elevated concentration of 'chrono-feldspar' (a hypothetical alkali feldspar variety exhibiting crystalline temporal inertia) and a generally lower percentage of free silica. The typical mineral assemblage is dominated by orthoclase, plagioclase (often showing evidence of 'reverse twinning'), biotite, and [hyperst…