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Evidence for a pulse of 1.45 Ga anorthosite–mangerite–charnockite–granite (AMCG) plutonism in Lithuania: implications for the Mesoproterozoic evolution of the East European Craton
Author(s) -
Skridlaitė Gražina,
Whitehouse Martin,
Rimša Andrius
Publication year - 2007
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1111/j.1365-3121.2007.00748.x
Subject(s) - geology , zircon , geochemistry , anorthosite , charnockite , plutonism , lineament , terrane , craton , orogeny , pluton , geomorphology , structural basin , seismology , quartz , paleontology , granulite , tectonics , facies , plagioclase
Several subcropping anorthosite–mangerite–charnockite–granite (AMCG) plutonic suites are aligned along E–W trending lineaments in the Lithuanian part of the East European Craton. The Rukai quartz monzodiorite from the Nemunas suite yields a zircon U–Pb intrusion age of 1447 ± 5 Ma, and the Geluva granite an age of 1445 ± 8 Ma, both obtained using secondary ion mass spectrometry. These rocks are 50 Myr younger than the 1.53–1.50 Ga Mazury AMCG complex in southern Lithuania and northern Poland. The Nemunas and Geluva AMCG rocks correlate in age with Bornholm granitoids in the Baltic Sea and Blekinge granites in southern Sweden, and are similarly aligned along E–W trending lineaments. This regional 1.45 Ga magmatic event across the Baltic Sea may be regarded as an inboard manifestation of the accretionary 1.50 Ga Danopolonian orogeny (cf. Pol. Mineral. Soc. Spec. Publ. , 2005, 26: 18) farther west.