Geochemistry and 40Ar/39Ar geochronology of Miocene volcanic rocks from the Karaburun Peninsula: Implications for amphibole-bearing lithospheric mantle source, Western Anatolia

Helvacı, Cahit; Ersoy, E. Yalçın; Sözbi̇li̇r, Hasan; Erkül, Fuat; Sümer, Ökmen; Uzel, Bora

doi:10.1016/j.jvolgeores.2009.05.016

Cited by 70 publications

(57 citation statements)

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“…To assess the relative importance of subduction and intraplate processes in generating Anatolian magmatism throughout Neogene times, we have compiled an extensive database of published basaltic samples. These samples have been assigned either radiometric or inferred chronostratigraphic ages (Figure 10; supporting information Data Set S3; Adiyaman et al, 2001;Agostini et al, 2007;Aldanmaz et al, 200, 2006Aldanmaz et al, 200, , 2015Alıcı et al, 2001Alıcı et al, , 2002Alıcı S¸en et al, 2004;Alpaslan, 2007;Altunkayak and Genc¸, 2008;Arger et al, 2000;Asan and Kurt, 2011;Aslan et al, 2014;Aydin, 2014;Bozkurt et al, 2008;C¸oban, 2007;Ekici et al, 2009;Erk€ ul et al, 2005;Ersoy et al, 2008Ersoy et al, , 2010Ersoy et al, , 2012Ersoy et al, , 2014Gencalioglu-Kusku, 2010;Gencalioglu-Kusku and Geneli, 2011;Gr€ utzner et al, 2013;Helvacı et al, 2009;Innocenti et al, 2005;Karao glu et al, 2010;Keskin et al, 1998;Kheirkhah et al, 2009;K€ urkc¸€ uo glu et al, 2015;K€ ur€ um et al, 2008;Lebedev et al, 2008aLebedev et al, , 2008bLebedev et al, , 2016aLebedev et al, , 2016bLustrino et al, 2010Lustrino et al, , 2012Neill et al, 2015;Notsu et al, 1995;…”

Section: Magmatismmentioning

confidence: 99%

Neogene Uplift and Magmatism of Anatolia: Insights From Drainage Analysis and Basaltic Geochemistry

McNab

Ball

Hoggard

et al. 2018

Geochem Geophys Geosyst

102

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It is agreed that mantle dynamics have played a role in generating and maintaining the elevated topography of Anatolia during Neogene times. However, there is debate about the relative importance of subduction zone and asthenospheric processes. Key issues concern onset and cause of regional uplift, thickness of the lithospheric plate, and the presence/absence of temperature and/or compositional anomalies within the convecting mantle. Here, we tackle these interlinked issues by analyzing and modeling two disparate suites of observations. First, a drainage inventory of 1,844 longitudinal river profiles is assembled. This database is inverted to calculate the variation of Neogene regional uplift through time and space by minimizing the misfit between observed and calculated river profiles subject to independent calibration. Our results suggest that regional uplift commenced at 20 Ma in the east and propagated westward. Second, we have assembled a database of geochemical analyses of basaltic rocks. Two different approaches have been used to quantitatively model this database with a view to determining the depth and degree of asthenospheric melting across Anatolia. Our results suggest that melting occurs at depths as shallow as 60 km in the presence of mantle potential temperatures as high as 1400°C. There is evidence that temperatures are higher in the east, consistent with the pattern of subplate shear wave velocity anomalies. Our combined results are consistent with isostatic and admittance analyses and suggest that elevated asthenospheric temperatures beneath thinned Anatolian lithosphere have played a first‐order role in generating and maintaining regional dynamic topography and basaltic magmatism.

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Section: Magmatismmentioning

confidence: 99%

Neogene Uplift and Magmatism of Anatolia: Insights From Drainage Analysis and Basaltic Geochemistry

McNab

Ball

Hoggard

et al. 2018

Geochem Geophys Geosyst

102

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“…Variable K-enrichment, different extent of Si-saturation and extremely variable isotopic and trace element compositions are clearly coupled with southward younging of the volcanism (Francalanci et al 2000;Dilek and Altunkaynak 2007;Helvacı et al 2009;Ersoy et al 2010a;Prelević et al 2012). The genesis and geodynamic implications of this magmatism are still a matter of debate, but large-scale mantle-source heterogeneity in its petrogenesis is widely accepted.…”

Section: Introductionmentioning

confidence: 99%

“…Distribution of the volcanic rocks is modified from MTA 1/500,000 scale geological map of Turkey. The summarized ages are from Borsi et al (1972), Besang et al (1977), Pişkin (1980), Sunder (1980), Paton (1992), Ercan et al (1996), Seyitoglu et al (1997), Aldanmaz et al (2000), Ercan et al (2000), Helvacı and Alonso (2000), Robert and Montigny (2001), Erkül et al (2005), Purvis et al (2005), Innocenti et al (2005), Westaway et al (2005), Ersoy et al (2008), Helvacı et al (2009), Ersoy et al (2010b) and Karaoglu et al (2010) Fig. 2 a Na 2 O ?…”

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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“…Menteş volcanic centre is considered to be the main source of the volcanoclastics. Lava samples collected from the Menteş Volcanic center by Mazzuoli (1972) and by Helvaci et al (2009) have been evaluated together in figure 15B and genetic connection between the acidic products of volcanisms have been studied.…”

Section: Main Elements Oxide Geochemistrymentioning

confidence: 99%

Neogene Stratigraphy of the İzmi̇r -Outer- Bay Islands

Göktaş¹

2016

Bulletin of the Mineral Research and Exploration

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The volcaniclastics, derived from calcalkaline acidic-intermediate volcanism in the region during late Early Miocene, and lacustrine deposits of Middle Miocene and alkaline volcanics are exposed on Uzun Island, Hekim Island, Çiçek Island and Karantina Island in the Outer Gulf of Izmir. Kocadağ volcaniclastics derived from Kocadağ volcanism, by extruding mainly calcalkaline andesitic-dacitic products during Late Early Miocene, represents the exposed oldest rock unit. The volcaniclastic succession extending in the north of Uzun Island is composed of pyroclastics in ignimbrite and blocky ash flow facieses, and epiclastics in volcanic mass flow (lahar) facies. Foça tuff, represented by rhyolitic ignimbrites, originated from an area around Foça and moving to an area around Uzun Island, emplaced onto the Kocadağ volcaniclastics in two main explosive stages. The Değirmentepe Member alluvial deposits composed of coarse volcanic detritus were deposited during a inactive period between the explosion stages. A K/Ar age of 16.0 Ma was obtained from a rhyolite dome, which shows lateral relationship with the correlant ignimbrites in Foça Peninsula, and so it is considered that Foça tuff emplaced onto the region at the end of late Early Miocene. Lacustrine-dominated Middle Miocene succession, which overlies the Foça tuff unconformably, differentiated as the Urla group. Urla group consists of alluvial Beşiktepe Formation, the Pirnalli Island volcaniclastics, which is composed of sublacustrine volcanic density-flow deposits and felsic ignimbrites, Hekim Island basalt comprising basic volcanics and lacustrine Urla limestone, respectively from bottom to top. Beşiktepe formation only exposed on Uzun Island, overlies the Foça tuff with an unconformity indicating a basin margin deposition during the Middle Miocene. Pirnalli Island volcaniclastic succession, which its lower boundary does not expose within the area on Hekim Island and Çiçek Islands, is mainly composed of epiclastics deposited by the dynamics of sublacustrine gravity flow and includes trachytic ignimbrite layers in various welding degrees. The main lithologic components of Pirnalli Island volcaniclastics derived from alkaline trachytic volcanism, which was active during the Middle Miocene in Menteş Peninsula. The eruption center of Hekim Island basalt intruding as a sill to the bottom of Urla limestone succession is on Hekim Island. Along the upper contact of the basalt intruding backshore deposits at the bottom of Urla limestone, the peperites occurred reflecting the interaction between molten lava and unconsolidated sediment. A K/Ar age of 14,8±0,8 Ma is obtained from the basic lavas called as trachybasalt and basaltic trachyandesite according to the major element composition. Hekim Island basalt, which exposed at the center of Foça Depression, can be correlated with both the Ilipinar basalt in Foça Peninsula and the Ovacik basalt in Urla basin with respect to chrono-and lithostratigraphy. Urla limestone succession, which transgressively overlies Hekim Island basalt, b...

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Geochemistry and 40Ar/39Ar geochronology of Miocene volcanic rocks from the Karaburun Peninsula: Implications for amphibole-bearing lithospheric mantle source, Western Anatolia

Cited by 70 publications

References 50 publications

Neogene Uplift and Magmatism of Anatolia: Insights From Drainage Analysis and Basaltic Geochemistry

Neogene Uplift and Magmatism of Anatolia: Insights From Drainage Analysis and Basaltic Geochemistry

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

Neogene Stratigraphy of the İzmi̇r -Outer- Bay Islands

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