Petrology and geochemistry of augite trachytes and porphyritic trachytes from the Gölcük volcanic region, Isparta, SW Turkey: A case study

Kumral, Mustafa; Çoban, Hakan; Gedikoglu, Atasever; Kilinc, A.

doi:10.1016/j.jseaes.2005.07.005

Cited by 23 publications

(9 citation statements)

References 13 publications

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“…The dashed line approximates the transition between alkaline and subalkaline series after Irvine and Baragar (1971). Melilite leucitite and lamproite analyses are from Akal (2003Akal ( , 2008 Agostini et al (2008Agostini et al ( , 2010, Akal and Helvacı (2000), Akal (2003Akal ( , 2008, Alıcı et al (1998), Aydar et al (1998), Ç oban andFlower (2006), Ç oban and Flower (2007), Ersoy et al (2008Ersoy et al ( , 2010a, Francalanci et al (2000), Karaoglu et al (2010), Kumral et al (2006) southward with age (Fig. 2a); degree of Si saturation is around zero in the time interval 10-15 Ma in the Afyon region (Fig.…”

Section: Introductionmentioning

confidence: 99%

High-K volcanism in the Afyon region, western Turkey: from Si-oversaturated to Si-undersaturated volcanism

Akal

Helvacı

Prelević³

et al. 2012

Int J Earth Sci (Geol Rundsch)

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Volcanic rocks of the Afyon province (eastern part of western Anatolia) make up a multistage potassic and ultrapotassic alkaline series dated from 14 to 12 Ma. The early-stage Si-oversaturated volcanic rocks around the Afyon city and further southward are trachyandesitic volcanic activity (14.23 ± 0.09 Ma). Late-stage Si-undersaturated volcanism in the southernmost part of the Afyon volcanic province took place in three episodes inferred from their stratigraphic relationships and ages. Meliliteleucitites (11.50 ± 0.03 Ma), spotted trachyandesites, tephryphonolites and lamproites (11.91 ± 0.13 Ma) formed in the first episode; trachyandesites in the second episode and finally phonotephrites, phonolite, basaltic trachyandesites and nosean-bearing trachyandesites during the last episode. The parameter Q [normative q-(ne ? lc ? kls ? ol)] of western Anatolia volcanism clearly decreased southward with time becoming zero in the time interval 10-15 Ma.

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Section: Introductionmentioning

confidence: 99%

High-K volcanism in the Afyon region, western Turkey: from Si-oversaturated to Si-undersaturated volcanism

Akal

Helvacı

Prelević³

et al. 2012

Int J Earth Sci (Geol Rundsch)

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“…The PREM model by Dziewonski and Anderson (1981) indicates that the seismic waves under the SW Anatolia are anomalously slow. lowed by extrusion of lavas and construction of domes (Kumral et al, 2006;Platevoet et al, 2008). Kumral et al (2006) suggested a shallow magma chamber at a crustal level, producing the trachytic products in the Isparta region.…”

Section: Discussionmentioning

confidence: 99%

“…lowed by extrusion of lavas and construction of domes (Kumral et al, 2006;Platevoet et al, 2008). Kumral et al (2006) suggested a shallow magma chamber at a crustal level, producing the trachytic products in the Isparta region. Similarly, Ç oban and Flower (2006) defined two discrete phases of pre-eruptive crystallization for lamproites, as mantle-level (1-2 GPa) and crustal-level (0.1-1 GPa).…”

Section: Discussionmentioning

confidence: 99%

Teleseismic inversion of crustal S-wave velocities beneath the Isparta Station

Erduran

2009

Journal of Geodynamics

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“…Geological map of the study area (modified from Kumral et al 2006). and chemical composition of the volcanics using previous works.…”

Section: Introductionmentioning

confidence: 99%

Relationship between chemical composition and magnetic susceptibility in the alkaline volcanics from the Isparta area, SW Turkey

et al. 2010

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Potassium-rich volcanic rocks in the Isparta area (SW Turkey) consist mainly of older (Pliocene) volcanic rock suites (e.g., lamprophyre, basaltic trachyandesite, trachyandesite, trachyte) and younger (Quaternary) caldera forming lava dome/flows (e.g., tephriphonolite, trachyte) and pyroclastics (ash/pumice fall deposits and ignimbritic flows). The magnetic susceptibility (K) was performed for both groups. The magnetic susceptibility value of the less evolved rocks characterized by SiO 2 < 57 wt% (e.g., basaltic trachyandesite, tephriphonolite, lamprophyric rocks) and having mostly mafic phenocrysts such as pyroxene, amphibole, and biotite-phlogopite is over 10 (10 −3 [SI]). Fine to medium-grained and subhedral to anhedral opaque minerals are scattered especially in the matrix phase of the less evolved volcanic rocks. However, the K value of the more evolved rocks (e.g., trachyte and trachyandesites) with SiO 2 over 57 wt% vary between 0.1 and 28, but most of them below 10. SI values are negatively correlated with SiO 2 , Na 2 O, but positively correlated with Fe 2 O 3 , CaO, MnO, P 2 O 5 and MgO contents, suggesting inverse variation of SI with fractionation of potassic magma. That is to say that less evolved volcanic rocks have relatively higher magnetic susceptibility values in the volcanic suite. Fine to medium-grained and subhedral to anhedral Fe-Ti oxides are scattered mainly in the matrix phase of the less evolved volcanics, presumably cause the pronounced relatively higher magnetic susceptibility.

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Petrology and geochemistry of augite trachytes and porphyritic trachytes from the Gölcük volcanic region, Isparta, SW Turkey: A case study

Cited by 23 publications

References 13 publications

High-K volcanism in the Afyon region, western Turkey: from Si-oversaturated to Si-undersaturated volcanism

High-K volcanism in the Afyon region, western Turkey: from Si-oversaturated to Si-undersaturated volcanism

Teleseismic inversion of crustal S-wave velocities beneath the Isparta Station

Relationship between chemical composition and magnetic susceptibility in the alkaline volcanics from the Isparta area, SW Turkey

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