Regional setting and geochronology of the Late Cretaceous Banatitic Magmatic and Metallogenetic Belt

Ciobanu, Cristiana L.; Cook, Nigel J.; Stein, Holly J.

doi:10.1007/s00126-002-0272-9

Cited by 119 publications

(69 citation statements)

References 51 publications

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“…Trench retreat and slab roll-back should therefore be considered separately. Slab roll-back seems to have been active in the eastern Mediterranean region not only since the Oligocene but also during the late Cretaceous, as suggested by the coeval trench retreat and magmatic arc migration in the Balkans and the Pontides (figures 8a-h) [Yılmaz et al, 1997;Ciobanu et al, 2002;Eyüboğlu et al, 2010]. This result does not exclude the possibility that other processes, such as gravitational collapse of thickened crust [Dewey, 1988;Vanderhaeghe, 2012], could have partially controlled these extensional events.…”

Section: Accepted M Manuscriptmentioning

confidence: 98%

“…In the Pontides, predominant volcanic rocks were mostly emplaced between the late Turonian and latest Campanian (~90-70 Ma) (figure 5) and seem to display southward migration through time [Yılmaz et al, 1997;Bektaş et al, 1999;Okay et al, 2001b;Eyüboğlu et al, 2010], similar to magmatic products in the Balkans [Ciobanu et al, 2002;von Quadt et al, 2005;Kolb et al, 2012].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Behind this compressional front, transtensional to extensional tectonics allowed the opening of sedimentary basins [Willingshofer et al, 1999;Sunal and Tüysüz, 2002]. At the same time, the magmatic activity seems to migrate southward [Yılmaz et al, 1997;Ciobanu et al, 2002;von Quadt et al, 2005;Eyüboğlu et al, 2010] suggesting a southward retreat of the oceanic slab Kolb et al, 2012]. Further north, the opening of the Black Sea basin was associated with an intense stretching of the crust and oceanic spreading in Cenomanian to Santonian times [Zonenshain and Le Pichon, 1986;Görür, 1988;Hippolyte et al, 2010;Nikishin et al, 2015b].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Kinematic reconstructions and magmatic evolution illuminating crustal and mantle dynamics of the eastern Mediterranean region since the late Cretaceous

2016

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Section: Accepted M Manuscriptmentioning

confidence: 98%

Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 99%

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Kinematic reconstructions and magmatic evolution illuminating crustal and mantle dynamics of the eastern Mediterranean region since the late Cretaceous

2016

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“…1). The Apuseni-Banat-Timok-Srednogorie (ABTS) belt represents a continental margin magmatic arc, whose tectonic evolution broadly relates to subduction processes prior to the Upper Cretaceous collision events (Ciobanu et al, 2002). Paleomagnetic studies show that the present sinusoidal L shape of the belt is a result of an~80°clockwise rotation of the Apuseni Mountains and Banat sectors during the Tertiary (Patrascu et al, 1992(Patrascu et al, , 1994Csontos, 1995;Fügenschuh and Schmid, 2005).…”

Section: Apuseni-banat-timok-srednogorie Belt and Srednogorie Zonementioning

confidence: 99%

High-K ankaramitic melt inclusions and lavas in the Upper Cretaceous Eastern Srednogorie continental arc, Bulgaria: Implications for the genesis of arc shoshonites

Marchev

Georgiev

Zajacz

et al. 2009

Lithos

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The Upper Cretaceous Yambol-Burgas region of the Eastern Srednogorie continental arc is characterized by unusually large volumes of mafic shoshonitic and ultra-K magmatism represented by high-Mg cumulitic rocks, and nepheline-normative ankaramites, absarokites and shoshonitic (high-alumina) basalts. The cumulitic rocks consist of phenocrysts of clinopyroxene and olivine ) with inclusions of spinel (Cr#75-78). Olivine high-Fo cores and clinopyroxene host glassy melt inclusions which have nephelinenormative compositions with ankaramitic CaO/Al 2 O 3 ratios (N 1), low SiO 2 (47.4-50.0 wt.%), high MgO (7.5-10.8 wt.%), high total alkalis and shoshonitic K 2 O/Na 2 O ratios (N1). Electron microprobe and LA-ICPMS analyses demonstrate that parental magma was a high-Ca primitive mantle melt. Melt inclusions from the less Fo 85 rim approach absarokite composition with CaO/Al 2 O 3 ratios b 1, lower MgO (5.2 wt.%), and higher total alkalis and K 2 O/Na 2 O ratio. The ankaramitic rocks are strongly porphyritic, composed of phenocrysts of altered olivine with spinel inclusions and large clinopyroxene. Their major and trace element compositions are similar to those of melt inclusions hosted in the high-Fo 91-90 cores and clinopyroxene of the cumulitic rock. The absarokites differ from the high-K ankaramites by slightly higher SiO 2 (50.6-52.7 wt.%), Al 2 O 3 and alkali-oxide contents, lower FeO and MgO and particularly low CaO/Al 2 O 3 (0.6-0.9) ratio. Compared to the absarokites, shoshonitic basalts have similar SiO 2 (50.2-52.8 wt.%) at lower MgO contents and CaO/Al 2 O 3 ratios (0.37-0.53). The presented extensive set of major and trace element data on melt inclusions and whole rocks, along with their main phenocryst compositions, is used to constrain the crystallization temperatures and pressures of the most primitive ankaramites. We suggest that ankaramite compositions are formed by melting of a garnet-free metasomatized mantle source rather than by melting of lower crustal cumulates. Numerical modelling demonstrates that the generation of absarokites and shoshonitic basalts is compatible with fractionation of olivine and clinopyroxene from ankaramitic magma. The high-Mg chemistry of cumulitic rocks is explained as the result of accumulation of these minerals.

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“…The Late Cretaceous ore-bearing magmatism lasted over 25 Ma (from ca. 92 to 65 Ma) and more than 50 important deposits and occurrences are genetically and spatially associated with "banatites" (see reviews: Ciobanu et al 2002;von Quadt et al 2005;Zimmerman et al 2008). However, Late Cretaceous magmatism is scarce within the western part of the ABCD belt where only minor aplite and pegmatite veins are reported to accompany Cretaceous metamorphism in the Alps and mineral deposits contrast with contemporaneous metamorphogenic siderite/ magnesite/talc and hydrothermal Cu vein deposits exposed in the Eastern Alps and Western Carpathians (Neubauer 2002).…”

Section: Discussionmentioning

confidence: 99%

Re-Os and U-Th-Pb dating of the Rochovce granite and its mineralization (Western Carpathians, Slovakia)

Kohút¹,

Stein²,

Uher³

et al. 2013

Geologica Carpathica

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The subsurface Rochovce granite intrusion was emplaced into the contact zone between two principal tectonic units (the Veporic Unit and the Gemeric Unit) of the Central Western Carpathians (CWC), Slovakia. The Cretaceous age of this granite and its Mo-W mineralization is shown using two independent methods: U-Pb on zircon and Re-Os on molybdenite. The studied zircons have a typical homogeneous character with oscillatory zoning and scarce restite cores. SHRIMP U-Pb data provide an age of 81.5 ± 0.7 Ma, whereas restite cores suggest a latest Neoproterozoic-Ediacaran age (~565 Ma) source. Zircon εHf(81) values -5.2 to + 0.2 suggest a lower crustal source, whereas one from the Neoproterozoic core εHf(565)= + 7.4 call for the mantle influenced old precursor. Two molybdenite- bearing samples of very different character affirm a genetic relation between W-Mo mineralization and the Rochovce granite. One sample, a quartz-molybdenite vein from the exocontact (altered quartz-sericite schist of the Ochtiná Formation), provides a Re-Os age of 81.4 ± 0.3 Ma. The second molybdenite occurs as 1-2 mm disseminations in finegrained granite, and provides an age of 81.6 ± 0.3 Ma. Both Re-Os ages are identical within their 2-sigma analytical uncertainty and suggest rapid exhumation as a consequence of post-collisional, orogen-parallel extension and unroofing. The Rochovce granite represents the northernmost occurrence of Cretaceous calc-alkaline magmatism with Mo-W mineralization associated with the Alpine-Balkan-Carpathian-Dinaride metallogenic belt.

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Regional setting and geochronology of the Late Cretaceous Banatitic Magmatic and Metallogenetic Belt

Cited by 119 publications

References 51 publications

Kinematic reconstructions and magmatic evolution illuminating crustal and mantle dynamics of the eastern Mediterranean region since the late Cretaceous

Kinematic reconstructions and magmatic evolution illuminating crustal and mantle dynamics of the eastern Mediterranean region since the late Cretaceous

High-K ankaramitic melt inclusions and lavas in the Upper Cretaceous Eastern Srednogorie continental arc, Bulgaria: Implications for the genesis of arc shoshonites

Re-Os and U-Th-Pb dating of the Rochovce granite and its mineralization (Western Carpathians, Slovakia)

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