Geochemistry and tectonic environment of Ordovician meta-igneous rocks in the Rudawy Janowickie Complex, SW Poland

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doi: 10.1144/gsjgs.152.1.0105
Authors:Winchester, J. A.; Floyd, P. A.; Chocyk, M.; Horbowy, K.; Kozdroj, W.
Author Affiliations:Primary:
University of Keele, Geology Department, Keele, United Kingdom
Jagiellonian University, Poland
Panstwowy Instytut Geologiczny, Poland
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, Vol.152 (Part 1), p.105-115. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1995
Note:In English. Includes appendix. 47 refs.; illus., incl. 1 table, geol. sketch map
Summary:A bimodal suite of metavolcanic rocks in the Rudawy-Janowickie Mts and the Lasocki Ridge (Sudetic region) is dominated by voluminous epidote amphibolites and greenschists derived from basalt, dolerite and gabbro precursors. Less abundant felsic components comprise both mylonitized granite sheets that intrude the mafic rocks, and minor interlaminated volcanic rocks ranging from andesite to rhyolite. The W part of this region contains all the alkali basalts and minor tholeiites, all exhibiting within-plate features such as high Zr/Y (>> 4) and enriched chondrite-normalized incompatible element patterns. The central province contains two fractionated tholeiitic suites with low Zr/Y (2.0-3.5), depleted to flat REE patterns and incompatible element compositions ranging from normal MORB to slightly enriched MORB. The complex is interpreted as a former intracratonic rift floored by oceanic crust and bounded to the west by an attenuated continental margin. [R.A.H.]
Subjects:Geochemistry; Metaigneous rocks; Metals; Metamorphic rocks; Ordovician; Paleozoic; Rare earths; Subduction zones; Tectonics; Central Europe; Europe; Poland; Rudawy Janowickie Complex; Southwestern Poland
Abstract Numbers:95M/3461
Record ID:1995036974
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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