Geochronological constraints for a two-stage history of the
Sveconorwegian rare-element pegmatite province formation

J 2023

Geochronological constraints for a two-stage history of the Sveconorwegian rare-element pegmatite province formation

ROSING-SCHOW, N.; R. L. ROMER; A. MÜLLER; F. CORFU; Radek ŠKODA et al.

Základní údaje

Originální název

Geochronological constraints for a two-stage history of the Sveconorwegian rare-element pegmatite province formation

Autoři

ROSING-SCHOW, N.; R. L. ROMER; A. MÜLLER; F. CORFU; Radek ŠKODA a H. FRIIS

Vydání

Precambrian Research, Elsevier, 2023, 0301-9268

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10504 Mineralogy

Stát vydavatele

Nizozemské království

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 3.200

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/23:00130392

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

Pegmatite; U-Pb dating; Columbite group minerals; Monazite; Sveconorwegian orogen; Grenville orogen

Štítky

14315010, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 2. 3. 2023 13:15, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

Most pegmatites of southern Norway seem to be derived from anatectic melting of metamorphic rocks during the Sveconorwegian orogeny rather than to be highly evolved residual melts derived from granites. We test this hypothesis by providing new age data for thirteen pegmatites and one granite. Based on these new age data, we distinguish two age groups of Sveconorwegian pegmatites (>1,000 m3 in size); Group 1: 1100–1030 Ma and Group 2: 930–890 Ma. All pegmatites except those from the Østfold area crystallized significantly earlier or later than adjacent granites. The Tørdal granite, yielding an age of 946 ± 4 Ma, is about 40 Ma older than the adjacent pegmatites. Field evidence and the age difference between pegmatites and granites supports an anatectic origin for these pegmatites. Sources of these pegmatite melts are biotite- and biotite-amphibole gneisses and amphibolites. Group 1 pegmatites formed in transpressional regimes after peak metamorphism, whereas Group 2 pegmatites formed in an extensional regime and the required heat for partial melting was provided by mafic magma underplating. Differences in the rheological behavior of amphibolite and granitic gneiss during extensional tectonics are the major reason why Group 2 pegmatites occur preferentially in large amphibolite bodies. Under mid-crustal conditions, amphibolite reacts brittle to semi-brittle forming open structures in an extensional tectonic regime where partial melts drained into. Granitic gneisses react in a ductile manner and do not have the ability to drain partial melt. Pegmatite formation in the Grenville Province, i.e., the Laurentian part of the Grenville–Sveconorwegian orogenic belt, formed between ca. 1090 and 980 Ma peaking at 1010 to 980 Ma. Thus, the Grenville peak postdates the Sveconorwegian Group 1 peak by about 30 Ma. These pegmatites formed in similar orogenic settings, implying that similar tectono-metamorphic developments along the Grenville–Sveconorwegian orogenic belt were diachronous. We conclude that local anatexis is the major pegmatite-melt forming process in the Sveconorwegian as well as Grenville orogen. Local anatexis also may be important in other pegmatite provinces.

Citovat

ROSING-SCHOW, N.; R. L. ROMER; A. MÜLLER; F. CORFU; Radek ŠKODA a H. FRIIS. Geochronological constraints for a two-stage history of the Sveconorwegian rare-element pegmatite province formation. Precambrian Research. Elsevier, 2023, roč. 384, January, s. 1-24. ISSN 0301-9268. Dostupné z: https://doi.org/10.1016/j.precamres.2022.106944.

@article{2263337,
   author = {RosingandSchow, N. and Romer, R. L. and Müller, A. and Corfu, F. and Škoda, Radek and Friis, H.},
   article_number = {January},
   doi = {https://doi.org/10.1016/j.precamres.2022.106944},
   keywords = {Pegmatite; U-Pb dating; Columbite group minerals; Monazite; Sveconorwegian orogen; Grenville orogen},
   language = {eng},
   issn = {0301-9268},
   journal = {Precambrian Research},
   title = {Geochronological constraints for a two-stage history of the Sveconorwegian rare-element pegmatite province formation},
   url = {https://doi.org/10.1016/j.precamres.2022.106944},
   volume = {384},
   year = {2023}
}

TY  - JOUR
ID  - 2263337
AU  - Rosing-Schow, N. - Romer, R. L. - Müller, A. - Corfu, F. - Škoda, Radek - Friis, H.
PY  - 2023
TI  - Geochronological constraints for a two-stage history of the Sveconorwegian rare-element pegmatite province formation
JF  - Precambrian Research
VL  - 384
IS  - January
SP  - 1-24
EP  - 1-24
PB  - Elsevier
SN  - 03019268
KW  - Pegmatite
KW  - U-Pb dating
KW  - Columbite group minerals
KW  - Monazite
KW  - Sveconorwegian orogen
KW  - Grenville orogen
UR  - https://doi.org/10.1016/j.precamres.2022.106944
N2  - Most pegmatites of southern Norway seem to be derived from anatectic melting of metamorphic rocks during the Sveconorwegian orogeny rather than to be highly evolved residual melts derived from granites. We test this hypothesis by providing new age data for thirteen pegmatites and one granite. Based on these new age data, we distinguish two age groups of Sveconorwegian pegmatites (>1,000 m3 in size); Group 1: 1100–1030 Ma and Group 2: 930–890 Ma. All pegmatites except those from the Østfold area crystallized significantly earlier or later than adjacent granites. The Tørdal granite, yielding an age of 946 ± 4 Ma, is about 40 Ma older than the adjacent pegmatites. Field evidence and the age difference between pegmatites and granites supports an anatectic origin for these pegmatites. Sources of these pegmatite melts are biotite- and biotite-amphibole gneisses and amphibolites. Group 1 pegmatites formed in transpressional regimes after peak metamorphism, whereas Group 2 pegmatites formed in an extensional regime and the required heat for partial melting was provided by mafic magma underplating. Differences in the rheological behavior of amphibolite and granitic gneiss during extensional tectonics are the major reason why Group 2 pegmatites occur preferentially in large amphibolite bodies. Under mid-crustal conditions, amphibolite reacts brittle to semi-brittle forming open structures in an extensional tectonic regime where partial melts drained into. Granitic gneisses react in a ductile manner and do not have the ability to drain partial melt. Pegmatite formation in the Grenville Province, i.e., the Laurentian part of the Grenville–Sveconorwegian orogenic belt, formed between ca. 1090 and 980 Ma peaking at 1010 to 980 Ma. Thus, the Grenville peak postdates the Sveconorwegian Group 1 peak by about 30 Ma. These pegmatites formed in similar orogenic settings, implying that similar tectono-metamorphic developments along the Grenville–Sveconorwegian orogenic belt were diachronous. We conclude that local anatexis is the major pegmatite-melt forming process in the Sveconorwegian as well as Grenville orogen. Local anatexis also may be important in other pegmatite provinces.
ER  -

ROSING-SCHOW, N.; R. L. ROMER; A. MÜLLER; F. CORFU; Radek ŠKODA a H. FRIIS. Geochronological constraints for a two-stage history of the Sveconorwegian rare-element pegmatite province formation. \textit{Precambrian Research}. Elsevier, 2023, roč.~384, January, s.~1-24. ISSN~0301-9268. Dostupné z: https://doi.org/10.1016/j.precamres.2022.106944.

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