Heterogeneous Zircon Cargo in Voluminous Late Paleozoic Rhyolites: Hf, O Isotope and Zr/Hf Records of Plutonic to Volcanic Magma Evolution

Pietranik, Anna; Słodczyk, Elżbieta; Hawkesworth, Chris J.; Breitkreuz, Christoph; Storey, Craig; Whitehouse, Martin J.; Milke, Ralf

doi:10.1093/petrology/egt019

Cited by 26 publications

(29 citation statements)

References 69 publications

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“…Furthermore, the Hf and O isotopic compositional fields of the southern rhyolites and the rhyolites from Penkun and Salzwedel in the NEGB (Fig. 6, Pietranik et al 2013a) partially overlap, Fig. 7 a Map showing the spatial distribution of the rhyolites in the NE German Basin, which were previously analysed by Breitkreuz et al (2007) and Pietranik et al (2013a) in addition to the rhyolites from the Polish Lowlands which were analysed during this study.…”

Section: Comparing Late Paleozoic High Silica Magmas In the Polish Lomentioning

confidence: 72%

“…As reported for large eruptable rhyolitic systems such as the Yellowstone Caldera (e.g. Stelten et al 2015) or the German part of the Central European Basin Large Igneous Province (Pietranik et al 2013a), the generation of such magmas involves at least two stages of melt evolution, first the extraction from a long-lived, isotopically heterogeneous crystal mush, and second the emplacement of a preeruptive, isotopically homogenized magma chamber. In such evolution scenarios chemical and isotope diversity is expected in zircon grains.…”

Section: Northern Rhyolitesmentioning

confidence: 85%

“…An interpretation whereby some of the underlying crust may be composed of Baltica-derived sediments is supported by recent studies on detrital and inherited zircons of the North East German Basin (NE GB; Pietranik et al 2013a) and of the Mid-German Crystalline Rise in central Germany (Zeh and Gerdes 2010). It is, therefore, reasonable to expect that data from zircons from volcanic rocks from the Polish Lowlands will provide additional constraints on crustal structures and their arrangement during the Late Paleozoic.…”

Section: Introductionmentioning

confidence: 91%

“…620, 1350 Ma, two grains with 1490, 1800 Ma) and not Gondwana, which should not contain inherited ages between 1000 and 2000 Ma (e.g. Breitkreuz et al 2007;Pietranik et al 2013a;Żelaźniewicz et al 2016;Franke and Dulce 2017). Therefore, a mixture of sediments derived from several crustal blocks is favoured as the source of Pniewy and Chrzypsko rhyolites, with Variscan foreland sediments being the dominating source.…”

Section: Inherited and Magmatic Zircon Ages: Insight Into Potential Mmentioning

confidence: 99%

“…However, it seems not to be the case for rhyolitic and granitic samples investigated here. Despite the overall similarities in the Hf and O isotope composition (Pietranik et al 2013a). The typical ranges in the isotopic ratios have been indicated between the Chrzypsko granite and the rhyolites from Chrzypsko and Pniewy in the south, the granite and volcanic rocks cannot be directly related.…”

Section: Chrzypsko Granite and Rhyolite: Are They Related?mentioning

confidence: 99%

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Contrasting sources of Late Paleozoic rhyolite magma in the Polish Lowlands: evidence from U–Pb ages and Hf and O isotope composition in zircon

Słodczyk

Pietranik

Glynn

et al. 2018

Int J Earth Sci (Geol Rundsch)

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The Polish Lowlands, located southwest of the Teisseyre-Tornquist Zone, within Trans-European Suture Zone, were affected by bimodal, but dominantly rhyolitic, magmatism during the Late Paleozoic. Thanks to the inherited zircon they contain, these rhyolitic rocks provide a direct source of information about the pre-Permian rocks underlying the Polish Lowland. This paper presents zircon U-Pb geochronology and Hf and O isotopic results from five drill core samples representing four rhyolites and one granite. Based on the ratio of inherited vs. autocrystic zircon, the rhyolites can be divided into two groups: northern rhyolites, where autocrystic zircon is more abundant and southern rhyolites, where inherited zircon dominates. We suggest that the magma sources and the processes responsible for generating high silica magmas differ between the northern and southern rhyolites. Isotopically distinct sources were available during formation of northern rhyolites, as the Hf and O isotopes in magmatic zircon differ between the two analysed localities of northern rhyolites. A mixing between magmas formed from Baltica-derived mudstone-siltstone sediments and Avalonian basement or mantle can explain the diversity between the zircon compositions from the northern localities Daszewo and Wysoka Kamieńska. Conversely, the southern rhyolites from our two localities contain zircon with similar compositions, and these units can be further correlated with results from the North East German Basin, suggesting uniform source rocks over this larger region. Based on the ages of inherited zircon and the isotopic composition of magmatic ones, we suggest that the dominant source of the southern rhyolites is Variscan foreland sediments mixed with Baltica/Avalonia-derived sediments.

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Section: Comparing Late Paleozoic High Silica Magmas In the Polish Lomentioning

confidence: 72%

Section: Northern Rhyolitesmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 91%

Section: Inherited and Magmatic Zircon Ages: Insight Into Potential Mmentioning

confidence: 99%

Section: Chrzypsko Granite and Rhyolite: Are They Related?mentioning

confidence: 99%

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Contrasting sources of Late Paleozoic rhyolite magma in the Polish Lowlands: evidence from U–Pb ages and Hf and O isotope composition in zircon

Słodczyk

Pietranik

Glynn

et al. 2018

Int J Earth Sci (Geol Rundsch)

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Is the Teisseyre‐Tornquist Zone an ancient plate boundary of Baltica?

et al. 2015

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The Teisseyre-Tornquist Zone (TTZ) is generally regarded as a fossil plate boundary in Europe that extends 2000 km from the Baltic Sea to the Black Sea. We used an integrated approach merging potential fields and seismic data to explore crustal architecture across the TTZ in central Poland. The aim of the study was to test whether the TTZ coincides with an early Paleozoic (Caledonian) suture formed through the closure of the Tornquist Ocean along the SW Baltica margin. The suture is presumed to separate the East European Craton (EEC) from the Paleozoic terranes of Western Europe. Two seismic reflection lines from the PolandSPAN ™ experiment were used to image the deep structure at the SW margin of the EEC. Lines PL-5300 and PL-5400 run NE-SW in central and northern Poland, respectively. The seismic interpretation down to top of basement was integrated with 2-D gravity and magnetic modeling to highlight the structure of the deep crust. Both the gravity and magnetic models show a suture that welds together two blocks at the base of crust. However, top of basement above the suture dips uniformly to the SW and is overlain by undisturbed lower Paleozoic and younger sediments. By implication, the suture must have developed in the Precambrian and both crustal blocks amalgamated belong to the EEC. Consequently, the Caledonian suture, formed by the closure of the Tornquist Ocean between Avalonia and Baltica, must be located farther southwest beneath thick upper Paleozoic and Mesozoic sediments.

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Carboniferous–Permian magmatism and Mo–Cu (W) mineralization in the contact zone between the Małopolska and Upper Silesia Blocks (south Poland): an echo of the Baltica–Gondwana collision

Mikulski

Williams

Markowiak

2019

Int J Earth Sci (Geol Rundsch)

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The Kraków-Lubliniec tectonic zone (KLFZ) in southern Poland, which divides the Małopolska Block (MB) from the Upper Silesia Block (USB), is a portion of the SW margin of the Trans-European Suture Zone. Zircon U-Pb dating of a variety of igneous rocks (granodiorites, dacites, lamprophyre and diabase) from the subsurface Kraków-Lubliniec igneous belt along the KLFZ shows that magmatism spanned within a narrow time period (ca. 10 Ma) between 303.8 ± 2.2 and 292.7 ± 4.9 Ma. The earlier magmatism (303.8 ± 2.2-294.7 ± 2.3 Ma) was felsic calc-alkaline, and the contemporaneous or/and slightly later alkaline volcanism (294.4 ± 4.9-292.7 ± 4.9 Ma) was of mafic-intermediate composition. The felsic rocks (granitoids and dacitoids) are weakly peraluminous, medium to high K, moderate Mg# (0.39-0.46), weakly evolved and I-type rocks. Due to the intensive development of hydrothermal alteration, these rocks are commonly strongly altered and locally mineralized by porphyry and other types of Mo-Cu (W) ores that are closely related to the felsic magmatism in space and time. The zircon U-Pb dating yielded ages which are similar to the previously measured Re-Os ages of molybdenites from the KLFZ. Felsic magmatism at the Myszków Mo-Cu-W deposit yielded ages in the range 301.0 ± 2.1-295.9 ± 2.9 Ma. The youngest rocks dated are from the Mysłów area in the USB-volcanic alkaline rocks (lamprophyre and diabase) of shoshonitic character, with low Mg# (0.49 and 0.69, respectively) and Ni contents (< 62 ppm), indicative of a relatively juvenile magma composition. Inherited zircon cores, remnant detrital zircon from a sediment component in the source rocks, were dated to be ranging from ca. 2775 to 575 Ma. Inheritance of ca. 600 Ma (Cadomian basement) and ca. 1.40 Ga (Mesoproterozoic) is common in the rocks from both blocks, but those from the MB contain additional inheritance with dates of 2.78-2.67 and 2.05-1.92 Ga, both ages characteristic of zircon from the Svecofennian of northern Europe (Baltica). The inherited zircon from the youngest alkaline rocks provided evidence for Mesoproterozoic (ca. 1.55-1.44 and 1.09 Ga) and Palaeoproterozoic (1.96 Ga) thermal events in the USB, and its possible affinity to Avalonian cratonic crust as a source for its igneous protolith. U-Pb isotopic studies of zircons from KL igneous belt indicate its inherited signatures from the crustal sources and magma emplacements during the KLFZ wrenching which allowed channels and room for magma emplacement along the MB and USB in upper Carboniferous-lower Permian on SW margin of the East-European Craton. Mo-Cu (W) ore mineralization, associated with the ~ 300 Ma felsic magmatism, represents rather the product of decompression melting induced in the areas of decreased pressure, undergone in the regional wrench fault zones than the classic Mo-Cu porphyry-style mineralization.

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Heterogeneous Zircon Cargo in Voluminous Late Paleozoic Rhyolites: Hf, O Isotope and Zr/Hf Records of Plutonic to Volcanic Magma Evolution

Cited by 26 publications

References 69 publications

Contrasting sources of Late Paleozoic rhyolite magma in the Polish Lowlands: evidence from U–Pb ages and Hf and O isotope composition in zircon

Contrasting sources of Late Paleozoic rhyolite magma in the Polish Lowlands: evidence from U–Pb ages and Hf and O isotope composition in zircon

Is the Teisseyre‐Tornquist Zone an ancient plate boundary of Baltica?

Carboniferous–Permian magmatism and Mo–Cu (W) mineralization in the contact zone between the Małopolska and Upper Silesia Blocks (south Poland): an echo of the Baltica–Gondwana collision

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