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What the ca. 1.83 Ga gedrite-cordierite schists in the crystalline basement of Lithuania tell us about the late Palaeoproterozoic accretion of the East European Craton
Swedish Museum of Natural History, Department of Geology. (Nordsim)ORCID iD: 0000-0003-2227-577X
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2018 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 140, no 4, p. 332-344Article in journal (Refereed) Published
Abstract [en]

ABSTRACTIn the western East European Craton (EEC), southern Lithuania, a suite of fine-grained, thinly bedded rocks of unusual composition has been shown to have originally comprised intermediate and felsic volcanic rocks. They extruded at ca. 1.83 Ga and were hydrothermally altered prior to metamorphism, which converted them into garnet-, gedrite-, anthophyllite-, staurolite- and cordierite-bearing schists. After the rocks have experienced a 630°C and 7 kbar metamorphism, they were uplifted to 15 km (5 kbar) probably at ca. 1.73 Ga. They were reheated to 640°C at ca. 1.50 Ga (monazite age). The monazite age of ca. 1.50 Ga is coeval with the emplacement of the neighboring 1.50 Ga Anorthosite-Mangerite-Charnockite-Granite (AMCG) Mazury complex. The ca. 1.83 Ga volcanic suites in Lithuania and northern Poland, together with the Oskarshamn-Jönköping belt (OJB) in south-central Sweden, may belong to the same chain of volcanic island arcs, and thus provide information on the evolution of the entire western EEC. The ca. 1.50 Ga metamorphic reworking and the replacement of the Mazury AMCG suite may have been triggered by the Danopolonian orogeny further west and, at a larger scale, accretion of the continental margin of Columbia.

Place, publisher, year, edition, pages
Taylor & Francis , 2018. Vol. 140, no 4, p. 332-344
National Category
Earth and Related Environmental Sciences
Research subject
The changing Earth
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URN: urn:nbn:se:nrm:diva-3216DOI: 10.1080/11035897.2018.1544588OAI: oai:DiVA.org:nrm-3216DiVA, id: diva2:1273867
Available from: 2018-12-22 Created: 2018-12-22 Last updated: 2019-01-07Bibliographically approved

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