Rare earth elements in middle precambrian volcanic rocks of Finland, with a discussion of the origin of the rocks

T. Koljonen, Rolf Rosenberg

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The contents of rare earth elements (REE) have been determined in five Svecofennian metamorphosed volcanic rocks and are compared with those found in the Karelian zone and Recent tholeiites. In the Svecofennian zone, REE contents in low silica volcanic rocks are like those in the calc-alkalic series and in continental tholeiites, whereas in the Karelian zone they are like those in island arc tholeiites. It is argued that in the Karelian zone, where magmatism initiated, tholeiitic basalts originated in the upper mantle; as shown in normalized form, the light REE are depleted, reflecting the distribution pattern found, for example, in rocks of pyrrolite composition. As orogeny advanced, more and more crustal material — basement and geosynclinal sediments — was recycled and the REE distribution pattern changed to that found in the synorogenic calc — alkalic rocks (1.8—1.95 Ga), reflecting the REE pattern present in sediments. The chemical composition of the magmatic rock series formed during Sveco-karelian folding is quite like that observed in island arc systems.
Original languageEnglish
Pages (from-to)127-138
Number of pages12
JournalBulletin of the Geological Society of Finland
Volume47
Issue number1-2
DOIs
Publication statusPublished - 1975
MoE publication typeNot Eligible

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Precambrian
volcanic rock
rare earth element
Svecofennian
rock
island arc
tholeiitic basalt
orogeny
sediment
folding
upper mantle
magmatism
silica
chemical composition
distribution

Cite this

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title = "Rare earth elements in middle precambrian volcanic rocks of Finland, with a discussion of the origin of the rocks",
abstract = "The contents of rare earth elements (REE) have been determined in five Svecofennian metamorphosed volcanic rocks and are compared with those found in the Karelian zone and Recent tholeiites. In the Svecofennian zone, REE contents in low silica volcanic rocks are like those in the calc-alkalic series and in continental tholeiites, whereas in the Karelian zone they are like those in island arc tholeiites. It is argued that in the Karelian zone, where magmatism initiated, tholeiitic basalts originated in the upper mantle; as shown in normalized form, the light REE are depleted, reflecting the distribution pattern found, for example, in rocks of pyrrolite composition. As orogeny advanced, more and more crustal material — basement and geosynclinal sediments — was recycled and the REE distribution pattern changed to that found in the synorogenic calc — alkalic rocks (1.8—1.95 Ga), reflecting the REE pattern present in sediments. The chemical composition of the magmatic rock series formed during Sveco-karelian folding is quite like that observed in island arc systems.",
author = "T. Koljonen and Rolf Rosenberg",
year = "1975",
doi = "10.17741/bgsf/47.1-2.015",
language = "English",
volume = "47",
pages = "127--138",
journal = "Bulletin of the Geological Society of Finland",
issn = "0367-5211",
publisher = "Geological Society of Finland",
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}

Rare earth elements in middle precambrian volcanic rocks of Finland, with a discussion of the origin of the rocks. / Koljonen, T.; Rosenberg, Rolf.

In: Bulletin of the Geological Society of Finland, Vol. 47, No. 1-2, 1975, p. 127-138.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Rare earth elements in middle precambrian volcanic rocks of Finland, with a discussion of the origin of the rocks

AU - Koljonen, T.

AU - Rosenberg, Rolf

PY - 1975

Y1 - 1975

N2 - The contents of rare earth elements (REE) have been determined in five Svecofennian metamorphosed volcanic rocks and are compared with those found in the Karelian zone and Recent tholeiites. In the Svecofennian zone, REE contents in low silica volcanic rocks are like those in the calc-alkalic series and in continental tholeiites, whereas in the Karelian zone they are like those in island arc tholeiites. It is argued that in the Karelian zone, where magmatism initiated, tholeiitic basalts originated in the upper mantle; as shown in normalized form, the light REE are depleted, reflecting the distribution pattern found, for example, in rocks of pyrrolite composition. As orogeny advanced, more and more crustal material — basement and geosynclinal sediments — was recycled and the REE distribution pattern changed to that found in the synorogenic calc — alkalic rocks (1.8—1.95 Ga), reflecting the REE pattern present in sediments. The chemical composition of the magmatic rock series formed during Sveco-karelian folding is quite like that observed in island arc systems.

AB - The contents of rare earth elements (REE) have been determined in five Svecofennian metamorphosed volcanic rocks and are compared with those found in the Karelian zone and Recent tholeiites. In the Svecofennian zone, REE contents in low silica volcanic rocks are like those in the calc-alkalic series and in continental tholeiites, whereas in the Karelian zone they are like those in island arc tholeiites. It is argued that in the Karelian zone, where magmatism initiated, tholeiitic basalts originated in the upper mantle; as shown in normalized form, the light REE are depleted, reflecting the distribution pattern found, for example, in rocks of pyrrolite composition. As orogeny advanced, more and more crustal material — basement and geosynclinal sediments — was recycled and the REE distribution pattern changed to that found in the synorogenic calc — alkalic rocks (1.8—1.95 Ga), reflecting the REE pattern present in sediments. The chemical composition of the magmatic rock series formed during Sveco-karelian folding is quite like that observed in island arc systems.

U2 - 10.17741/bgsf/47.1-2.015

DO - 10.17741/bgsf/47.1-2.015

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JO - Bulletin of the Geological Society of Finland

JF - Bulletin of the Geological Society of Finland

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