Compositional diversity of Eocene–Oligocene basaltic magmatism in the Eastern Rhodopes, SE Bulgaria: implications for genesis and tectonic setting

Marchev, Peter; Raicheva, Raya; Downes, Hilary; Vaselli, Orlando; Chiaradia, Massimo; Moritz, Robert

doi:10.1016/j.tecto.2004.07.045

Cited by 105 publications

(114 citation statements)

References 71 publications

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“…Schiano et al (2000) suggested that it could be either arc magmas passing through the lower crust or hot adiabatically upwelling mantle that produces water-poor arc magmas and heats the overlying crust. Petrographic observation on the Rhodope cumulitic rocks, entrained within the alkaline basalts, showed that the source cumulate bodies were not affected by the general increase of the temperature in the region, caused by asthenosphere upwelling (Marchev et al, 2004). Moreover, they survived even the high temperature influence of the host alkaline basalts, suffering only limited metasomatic exchange.…”

Section: Origin Of the Ankaramitesmentioning

confidence: 97%

“…Discussion 9.1. Relationships between the cumulate, high-K ankaramites and associated mafic shoshonites Shoshonitic magmas are widespread in continental arc settings such as the Aeolian Volcanic Arc (Francalanci et al, 2007), the Eastern Rhodopes, Bulgaria (Marchev et al, 2004), the Tibetan Plateau (Turner et al, 1996), the Mexican Volcanic Belt (Blatter et al, 2001) and, more rarely, in back-arc settings or oceanic island arcs (e.g. Izu-BoninMariana arc; Sun and Stern, 2001).…”

Section: Diffusion Of Fe and Ca From The Melt Inclusions Into Olivinementioning

confidence: 99%

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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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Section: Origin Of the Ankaramitesmentioning

confidence: 97%

Section: Diffusion Of Fe and Ca From The Melt Inclusions Into Olivinementioning

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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“…From the late Eocene to the Miocene, widespread magmatic activity developed in the Rhodope massif during the last stages of exhumation of the central and south Rhodope core complexes [Jones et al, 1992;Marchev et al, 2004bMarchev et al, , 2005Ersoy and Palmer, 2013]. Migmatites and associated leucogranitic veins have been observed in the cores of several metamorphic domes constituting the central Rhodope core complex [Burg et al, 1996;Marchev et al, 2004b].…”

Section: The Rhodope Magmatic Provincementioning

confidence: 99%

“…Migmatites and associated leucogranitic veins have been observed in the cores of several metamorphic domes constituting the central Rhodope core complex [Burg et al, 1996;Marchev et al, 2004b].…”

Section: The Rhodope Magmatic Provincementioning

confidence: 99%

“…The composition of most of these magmas evolves from high-K calc-alkaline to shoshonitic, including both mafic and silicic rocks [Marchev et al, 2004b;Ersoy and Palmer, 2013]. Their geochemical and isotopic signatures reflect both subduction-related metasomatized mantle and crustal source components, the latter decreasing from northwest to southeast [Marchev et al, 2004b[Marchev et al, , 2005Ersoy and Palmer, 2013].…”

Section: The Rhodope Magmatic Provincementioning

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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Age and composition of meta‐ophiolite from the Rhodope Middle Allochthon (Satovcha, Bulgaria): A test for the maximum‐allochthony hypothesis of the Hellenides

et al. 2014

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The metamorphosed thrust stack of the Rhodopes comprises a level with ophiolites (Middle Allochthon) underlain and overlain by continent-derived allochthons. The Upper Allochthon represents the European margin, but the origin of the Lower Allochthon remains controversial, with suggestions that it may be derived from an inferred microcontinent (Drama) or from the margin of Adria. Trace element compositions and Sr and Nd isotope ratios of metagabbroic amphibolites and enclosed meta-plagiogranites from the Satovcha Ophiolite, Middle Allochthon, show that they are cogenetic and represent suprasubduction zone ophiolites. U-Pb dating using laser ablation sector field inductively coupled plasma mass spectrometry of zircons from two meta-plagiogranites and a metagabbro yielded identical Jurassic ages (160 ± 1 Ma, 160.6 ± 1.8 Ma, and 160 ± 1 Ma, respectively), similar to ophiolites in the eastern Vardar Zone bordering the Rhodopes to the SW. The trace element patterns also closely resemble those of the Vardar ophiolites. The association with Late Jurassic arc-type granitoids is another feature that applies both to eastern Vardar and Satovcha. This strongly suggests that the Middle Allochthon comprises the metamorphosed northeastward continuation of the Vardar Zone. The Jurassic age of the Satovcha Ophiolite contradicts the hypothesis of Early Jurassic suturing between Europe (Upper Allochthon) and the assumed Drama microcontinent (Lower Allochthon) but is in line with the "maximum allochthony hypothesis," i.e., the assumption that the Lower Allochthon represents Adria and that the "root" of the Vardar-derived thrust sheets is at the NE boundary of the Rhodopes.

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Compositional diversity of Eocene–Oligocene basaltic magmatism in the Eastern Rhodopes, SE Bulgaria: implications for genesis and tectonic setting

Cited by 105 publications

References 71 publications

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

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

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

Age and composition of meta‐ophiolite from the Rhodope Middle Allochthon (Satovcha, Bulgaria): A test for the maximum‐allochthony hypothesis of the Hellenides

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