Zircon typology, geochronology and whole rock Sr?Nd isotope systematics of the Mecsek Mountain granitoids in the Tisia Terrane (Hungary)

Klötzli, Urs; Buda, György; Skiöld, Torbjörn

doi:10.1007/s00710-003-0026-0

Cited by 31 publications

(32 citation statements)

References 18 publications

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“…Based on the new geochemical data and U-Pb ages, we distinguish three distinct events in the Jurassic, (1) back-arc ophiolite formation in the Oxfordian to Early Kimmeridgian (~160 Ma), (2) roll-back of the intra-oceanic subduction and generation of an island arc mainly in the Early Kimmeridgian (~157 Ma), and (3) Schmid et al (2008), Kounov and Schmid (2013) and Božović et al (2013); they also take into account that the ALCAPA, Tisza, and Dacia Mega-Units rifted off Europe side by side when the Alpine Tethys opened (e.g. Klötzli et al 2004), and partly follow unpublished GPlates reconstructions by Douwe van Hinsbergen. While certain details in Figures 10a,b In the Oxfordian to Early Kimmeridgian (~160 Ma), the Neotethys Ocean started to close along two distinct NE-dipping subduction zones, concomitantly with opening of the Alpine Tethys further north (Figs.…”

Section: Geodynamic Modelmentioning

confidence: 99%

Magmatic and tectonic history of Jurassic ophiolites and associated granitoids from the South Apuseni Mountains (Romania)

et al. 2016

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The Jurassic ophiolites in the South Apuseni Mountains represent remnants of the Neotethys Ocean and belong to the East Vardar ophiolites that contain ophiolite fragments as well as granitoids and volcanics with island-arc affinity. New U-Pb zircon ages, and Sr and Nd isotope ratios give insights into their tectono-magmatic history. The ophiolite lithologies show tholeiitic MOR-type affinities, but are occasionally slightly enriched in Th and U, and depleted in Nb, which indicates that they probably formed in a marginal or back-arc basin. These ophiolites are associated with calc-alkaline granitoids and volcanics, which show trace element signatures characteristic for subduction-enrichment (high LILE, low HFSE). Low 87 Sr/ 86 Sr ratios (0.703836-0.704550) and high 143 Nd/ 144 Nd ratios (0.512599-0.512616) of the calc-alkaline series overlap with the ratios measured in the ophiolitic rocks (0.703863-0.704303 and 0.512496-0.512673), and hence show no contamination with continental crust. This excludes a collisional to postcollisional origin of the granitoids and is consistent with the previously proposed intra-oceanic island arc setting. The new U-Pb ages of the ophiolite lithologies (158.9-155.9 Ma, Oxfordian to Early Kimmeridgian) and granitoids (158.6-152.9 Ma, latest Oxfordian to Late Kimmeridgian) indicate that the two distinct magmatic series evolved within a narrow time range. It is proposed that the ophiolites and island arc granitoids formed above a long-lived NE-dipping subduction zone. A sudden flip in subduction polarity led to collision between island arc and continental margin, immediately followed by obduction of the ophiolites and granitoids on top of the continental margin of the Dacia Mega-Unit. Since the granitoids lack crustal input, they must have intruded the Apuseni ophiolites before both magmatic sequences were obducted onto the continental margin. The age of the youngest granitoid (~153 Ma, Late Kimmeridgian) yields an estimate for the maximum age of emplacement of the South Apuseni ophiolites and associated granitoids onto the Dacia Mega-Unit.

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Section: Geodynamic Modelmentioning

confidence: 99%

Magmatic and tectonic history of Jurassic ophiolites and associated granitoids from the South Apuseni Mountains (Romania)

et al. 2016

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“…Recently Klötzli et al (2004) provided evidence that the Late Paleozoic granitoids of the Mecsek Mountains likely formed at a location S or SSW of the Rastenberg granodiorite of the Bohemian Massif. This basement is therefore considered to represent a former part of the Moldanubian Zone.…”

Section: Overviewmentioning

confidence: 99%

The Alpine-Carpathian-Dinaridic orogenic system: correlation and evolution of tectonic units

et al. 2008

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“…Compared to loess, many potential source rocks have a di erent isotopic signature with much higher ϵ ND values (Figure 7, Figure 9, Figure 10), including basalts from Hungary and Austria (Carpathian Basin (CB); [56]), igneous rocks from the Central Alps [57], igneous rocks from Hungary and Romania (Eastern Carpathians (EC); [58]) and Bohemian Massif granites (BM; [59]). Our loess samples plot close to, or within, the rectangles of East Carpathian ysch [60], granites from the Tisia terrane in Southwest Hungary (Carpathian Basin (CB); [61]), Bohemian Massif sedimentary rocks [62], Western Carpathian granites (WC; [63]), and at some distance to Slovakian gneiss (WC; [64]) and Czech metamorphic rocks (BM; [65]). A more detailed analysis of single data points (Figure 10) reveals that the loess samples overlap with several rock samples, most notably with East Carpathian ysch [60].…”

Section: Rocks and Floodplain Sediments As Potential Sources Of Tokmentioning

confidence: 99%

Tracking potential source areas of Central European loess:examples from Tokaj (HU), Nussloch (D) and Grub (AT)

Schatz

Siebel

et al. 2015

Open Geosciences

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There are several competing hypotheses for the origin of loess in Europe but quantitative evidence is still rare. Here, Sr-Nd isotopic and bulk elemental composition of loess from Marine Isotope Stages 2 and 3 from three study regions in Central Europe -Nussloch (Germany), Grub (Austria) and Tokaj (Hungary) -are analyzed. This study aims at examining di erences and similarities of loess deposits throughout Europe, correlating loess with potential source rocks from major mountain ranges and comparing loess with oodplain sediments from main rivers as integrated samples of the drainage areas. The results show that European loess deposits are largely uniform and that sediment sources have been rather stable in the Southern and Eastern parts of Central Europe and more variable in West Central Europe. However, the methods used are not su cient to unequivocally con rm and reject potential sediment sources but, in combination, help to identify the most likely sediment origins. While a direct correlation of loess and potential source rocks is difcult, the comparison with oodplain sediments is most promising and con rms previous hypotheses. Loess from Tokaj and Grub is most likely a mix of material transported by the Danube River and sediments from the surrounding mountains. Rhine River sediments are probably the main source of loess at Nussloch.

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Zircon typology, geochronology and whole rock Sr?Nd isotope systematics of the Mecsek Mountain granitoids in the Tisia Terrane (Hungary)

Cited by 31 publications

References 18 publications

Magmatic and tectonic history of Jurassic ophiolites and associated granitoids from the South Apuseni Mountains (Romania)

Magmatic and tectonic history of Jurassic ophiolites and associated granitoids from the South Apuseni Mountains (Romania)

The Alpine-Carpathian-Dinaridic orogenic system: correlation and evolution of tectonic units

Tracking potential source areas of Central European loess:examples from Tokaj (HU), Nussloch (D) and Grub (AT)

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