Magma mixing in the Sithonia Plutonic Complex, Greece: evidence from mafic microgranular enclaves

Perugini, Diego; Poli, Guido; Christofides, G.; Eleftheriadis, Georgios K.

doi:10.1007/s00710-002-0225-0

Cited by 169 publications

(100 citation statements)

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“…These features are considered as proofs of mass transfer between the interacting magmas and as indications that the enclaves were in a liquid state upon their incorporation into the more felsic magma (e.g. Vernon, 1984;Castro, Mereno-Ventas & de la Rosa, 1991;Perugini et al 2003). However, this feature is lacking in the ME rocks both in the field and on a thin-section scale.…”

Section: A Qmzdmentioning

confidence: 99%

Petrogenetic and tectonic inferences from the study of the Mt Cer pluton (West Serbia)

et al. 2010

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-The Mt Cer Pluton, Serbia, is a complex laccolith-like intrusion (∼ 60 km 2 ), situated along the junction between the southern Pannonian Basin and northern Dinarides. It intrudes Palaeozoic metamorphic rocks causing weak to strong thermal effects. Based on modal and chemical compositions, four rock-types can be distinguished: (1) metaluminous I-type quartz monzonite/quartz monzodiorite (QMZD); (2) peraluminous S-type two-mica granite (TMG), which intrudes QMZD; (3) Stražanica granodiorite/quartz monzonite (GDS); and (4) isolated mafic enclaves (ME), found only in QMZD. 40 K-39 Ar dating and geological constraints indicate that the main quartz monzonite/quartz monzodiorite body of Mt Cer was emplaced not later than 21 Ma, whereas the emplacement ages of the Stražanica granodiorite/quartz monzonite and two-mica granites are estimated at around 18 and 16 Ma, respectively. The Mt Cer pluton is similar to the Mt Bukulja pluton, some 80 km southwestwards. Genesis of QMZD cannot be interpreted by fractional crystallization coupled with mixing or assimilation. It is best explained by a convection-diffusion process between mantle-derived minette/leucominette magmas and GDS-like magmas followed by two end-member magma mixing. The composition of GDS rocks suggests that GDS-like magmas could have formed by melting of lower crustal lithologies similar to amphibolite/metabasalts. The geochemistry of TMG is reproduced by an Assimilation/Fractional Crystallization model with a ratio of rate of assimilation to rate of fractional crystallization of 0.4, using the compositions of the least evolved TMG of the Bukulja pluton and adjacent metamorphic rocks as proxies for the parental magma and contaminant, respectively. The origin and evolution of the Mt Cer and adjacent Mt Bukulja plutons provide new constraints on the Tertiary geodynamics of the northern Dinarides-southern Pannonian region. The quartz monzonite/quartz monzodiorite is interpreted as a result of the Oligocene post-collisional Dinaride orogen-collapse, which included a limited lithosphere delamination, small-scale mantle upwelling, and melting of the lower crust. By contrast, the two-mica granite magmas formed through melting in shallower crustal levels during the extensional collapse in the Pannonian area.

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Section: A Qmzdmentioning

confidence: 99%

Petrogenetic and tectonic inferences from the study of the Mt Cer pluton (West Serbia)

et al. 2010

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“…4-9) produces near-linear trends or overlapping pattern suggesting genetic linkage between them, and could be related to the processes of restite unmixing (Chappell et al, 1987), or fractional crystallization (Dodge and Kistler, 1990) or mixing of mafic-felsic magmas (e.g., Castro et al, 1990;Barbarin and Didier, 1992;Perugini et al, 2003;Arvin et al, 2004;Kumar and Rino, 2006). A wide and near-linear compositional range of ME cannot however, be produced as cumulates of OG or restite separation, particularly for the overlapped ME and OG.…”

Section: Magma-mixing and Fractional Crystallization Of Resultant Magmamentioning

confidence: 99%

“…Symbols as in Fig. 4. 1991; Barbarin and Didier, 1992;Blundy and Sparks, 1992;Wiebe et al, 1997;Perugini et al, 2003;Arvin et al, 2004;Kumar and Rino, 2006;Kumar, 2010). This model of arc-related magmatism and hybrid mixing of mafic and felsic magmas can also be accounted for the generation of ME and OG of Shyok-Darbuk corridor of eastern Ladakh as discussed below.…”

Section: Discussionmentioning

confidence: 99%

Mantle-derived arc related mafic enclaves and host orthogneiss from the Shyok Suture Zone of NE Ladakh, India: An evidence of magma-mixing

Rao

Daga

Rai³

2013

Geochem. J.

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The Shyok valley in the northern Ladakh is a linear NW-SE trending suture zone (Shyok Suture Zone) and separates two distinct terranes, the southern continental margin of Eurasian Plate to north, and Ladakh magmatic arc to south. The crustal growth in the Shyok Suture Zone (SSZ) can be explained by two stage melting process involving the generation of orthogneiss (OG) with mafic enclaves (ME) (pre-collision), and temporal evolution towards increasingly more evolved felsic magmas during reworking processes (post-collision). In this paper, the geochemistry of various ME and host OG that fall within the Shyok-Darbuk corridor of the suture zone are discussed.The field, petrographic and geochemical data suggest that the ME and host OG are genetically related. The ME has formed by low degree of partial melting of a garnet-bearing source or from the partial melting of a basaltic source with a clinopyroxene-garnet eclogite as residue. The LILE and LREE enrichment of ME have been influenced by mantle-magma interaction during the passage of the hydrous primary arc-magma through the overlying lithosphere. The likely interpretation for the genetic linkage of ME and host OG is explained through the mixing of coeval mafic (enclave) and felsic melts, resulting in hybrid magma. Besides, several geochemical lines of evidence suggest that fractional crystallization of the resultant hybrid magma had played a complementary role in the evolution of these rocks.

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“…The geochemistry of the SPC has been studied by Sapountzis et al (1976Sapountzis et al ( , 1979, De Wet & Miller (1986), Christofides et al (1990), D'Amico et al (1990, Perugini et al (2003), Christofides et al (2007). The chemical composition of the SPC rocks ranging from tonalites to leucogranites corresponds to a chemical range of 62 % to 77 % SiO 2 .…”

Section: Geochemistrymentioning

confidence: 99%

“…The origin, evolution and age of the Sithonia Plutonic Complex (SPC) intruding the Circum Rhodope Zone and Serbomacedonian Massif have been studied by many researchers (Soldatos & Sapountzis 1975;Sapountzis et al 1976Sapountzis et al , 1979De Wet & Miller 1986;Christofides et al 1990Christofides et al , 1998Christofides et al , 2007D'Amico et al 1990;Perugini et al 2003;Pipera et al 2010;Melfos et al 2012;Romanidis et al 2012). The study of the Sithonia Eocene pluton is of great importance for the clarification of the geotectonic evolution of the Sidironero and Pangeon tectonic units of the Rhodope Massif since the Serbomacedonian Massif is considered equivalent to the Pangeon tectonic unit (Christofides et al 2001).…”

Section: Introductionmentioning

confidence: 99%

K/Ar mineral geochronology of the northern part of the Sithonia Plutonic Complex (Chalkidiki, Greece): implications for its thermal history and geodynamic interpretation

Pipera¹,

Koroneos²,

Σολδάτος³

et al. 2013

Geologica Carpathica

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New K/Ar mineral ages of thirty nine samples (biotite, muscovite, K-feldspar) from the two-mica granodiorite to granite and leucogranite of the northern part of the Sithonia Plutonic Complex (Chalkidiki, Greece) are given in the present study. These data along with existing Rb/Sr mica and U/Pb zircon ages are used to investigate the thermal history of the plutonic complex and shed light on the process that affected it, and caused discordant Rb/Sr and K/Ar mineral ages. The K/Ar mineral dating yielded ages ranging from 38 to 49 Ma for muscovites, 32 to 47 Ma for biotites and 37 to 43 Ma for K-feldspars, respectively. The comparison of the K/Ar, Rb/Sr and U/Pb mineral ages and the closure temperatures of the different isotopic systems for the different minerals indicate a rapid cooling rate for the Sithonia pluton. The latter supports the hypothesis that the pluton was formed in a post orogenic extensional regime. Moreover, the K/Ar mineral isochrones indicate that a reheating of the pluton took place before 37 Ma and partially rejuvenated the K/Ar and Rb/Sr isotopic system of the minerals. to the lower closure temperatures of the minerals for the K/Ar isotopic system in respect to the Rb/Sr system, the former is more easily affected by any reheating and so it is more possible to detect any isotopic disturbance. The subject of the present study is the K/Ar mineral geochronology of the northern part of the Sithonia pluton. The systematic K/Ar study of the pluton in association with the previous geochronological studies sheds light on the pluton's thermal history after its emplacement and on its affinity with the geotectonic regime. Analytical methodsThe samples were crushed and the 150-250 µm grain size was collected. A vibrating table and a Franz Isodynamic Magnetic separator (model L-1) were used to separate muscovite and biotite. K-feldspar was extracted using the same magnetic separator and the heavy liquid tetrabromoethane (Br 2 CHCHBr 2 ). The separation of the minerals was performed at the Department of Mineralogy, Petrology and Economic Geology, Aristotle University of Thessaloniki, Greece. Muscovite and biotite chemical analyses were performed on a JEOL scanning electron microscope at the Department of Mineralogy, Petrology and Economic Geology, Aristotle University of Thessaloniki, Greece. The operating conditions were: 20 kV and 20 nA, with a beam diameter < 1 mm.X-Ray Powder Diffraction analyses (XRPD) were performed on each mineral extract to calculate the proportion of mineral and the purity of it. Powder XRPD analyses were obtained on a PHILIPS PW1820/00 X-ray diffractometer of the Department of Mineralogy, Petrology and Economic Geology, School of Geology, Aristotle University of Thessaloniki, carrying a PW1710 microprocessor. The operating conditions for all samples were 35 kV and 25 mA using Ni-filtered CuK radiation. The 2-theta scanning range was between 3°a nd 63° and the scanning speed was 1.2 °/min. Refinements were done with the PCAPD software and the identification of the samples ...

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Magma mixing in the Sithonia Plutonic Complex, Greece: evidence from mafic microgranular enclaves

Cited by 169 publications

References 37 publications

Petrogenetic and tectonic inferences from the study of the Mt Cer pluton (West Serbia)

Petrogenetic and tectonic inferences from the study of the Mt Cer pluton (West Serbia)

Mantle-derived arc related mafic enclaves and host orthogneiss from the Shyok Suture Zone of NE Ladakh, India: An evidence of magma-mixing

K/Ar mineral geochronology of the northern part of the Sithonia Plutonic Complex (Chalkidiki, Greece): implications for its thermal history and geodynamic interpretation

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