40Ar/39Ar geochronology, geochemistry and petrology of volcanic rocks from the Simav Graben, western Turkey

Abstract

Mediterranean. All the rock groups have similar and high abundances of incompatible trace elements, and radiogenic Sr. Geochemical modeling of the trace element and isotopic ratios of the samples reveals that both the SHO-UK and HKCA groups were derived from a common mantle source which had been highly metasomatized and enriched by continental materials during partial subduction of the crustal metamorphic slices in a continental collision setting. The geochemical variations of these rocks were mainly controlled by source characteristics (such as heterogeneity) and variable degrees of partial melting and subsequent effects of fractional crystallization, with low degrees of crustal contamination. The HKCA series were derived by higher degrees of partial melting of the lithospheric mantle source than the SHO-UK rocks. The HKCA rocks then underwent two-stage fractional crystallization (clinopyroxene-dominated followed by feldspar-dominated fractionating mineral assemblages) to form the high-K calc-alkaline basalt to rhyolite series, whereas the SHO-UK rocks experienced comparatively little fractional crystallization. A tectonic scenario involving the rapidly extending and thinning of orogenic crust is compatible with the time-dependent compositional variation of the magmatic rocks.

Geochronology and geochemistry of Eocene-aged volcanic rocks around the Bafra (Samsun, N Turkey) area: Constraints for the interaction of lithospheric mantle and crustal melts

“…chondrite (Taylor and McLennan, 1985) normalized rare earth element patterns plots of the volcanic rock samples from the Bafra (Samsun) area. the Middle Miocene volcanics NE-Turkey (Temizel et al, 2012;Aslan et al, 2014), Middle Eocene intrusives (Karslı et al, 2012;Temizel, 2014) and volcanics (Kaygusuz et al, 2011;Temizel et al, 2012;Arslan et al, 2013, Aslan et al, 2014 from NE-Turkey, ultrapotassic rocks from Macedonia and W-Turkey (Prelević et al, 2008), Early-Middle Miocene high-K calc-alkaline rocks from W-Turkey (Ersoy et al, 2012;Semiz et al, 2015), and ultrapotassic rocks from Spain and Italy (Conticelli and Peccerillo, 1992;Prelević et al, 2008). Data for…”

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

“…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 ; supporting information Data Set S3; Adiyaman et al, ; Agostini et al, 2007; Aldanmaz et al, 200, , ; Alıcı et al, , ; Alıcı Şen et al, ; Alpaslan, ; Altunkayak and Genç, 2008; Arger et al, ; Asan and Kurt, ; Aslan et al, ; Aydin, 2014; Bozkurt et al, ; Çoban, 2007; Ekici et al, ; Erkül et al, ; Ersoy et al, , 2010, 2012, ; Gencalioglu‐Kusku, ; Gencalioglu‐Kusku and Geneli, ; Grützner et al, ; Helvacı et al, ; Innocenti et al, 2005; Karaoğlu et al, ; Keskin et al, ; Kheirkhah et al, ; Kürkçüoğlu et al, ; Kürüm et al, ; Lebedev et al, a, b, a, 2016b; Lustrino et al, , ; Neill et al, 2015; Notsu et al, 1995; Oyan et al, ; Özdemir et al, , ; Parlak et al, 2999, ; Paton, 1992; Polat et al, ; Prelević et al, 2012, ; Reid et al, 2017; Richardson‐Bunbury, 1992; Semiz et al, ; Seyitoğlu et al, ; Temel et al, ; Varol et al, ; Wilson et al, 1997). Major and trace element analyses and/or isotopic measurements of samples with MgO > 5 wt% are presented.…”

Petrography and geochemistry of Bahatlar volcanites (Emet-Kütahya)

“…Cihazın iyon kaynağı, %90'dan fazla transmisyon ve aşırı derecede küçük izotopik kütle ayırımı sağlayan eksenel bir tasarıma (Baur-Signer kaynağı) sahiptir. Ölçüm aşamasında, Ar izotop oranları kütle ayrımı için düzeltilmiş ve daha sonra atmosferik argon, 36 Ar'ın sadece atmosferik olduğu varsayılarak ölçümden çıkarılmıştır. 40 Ar radyojenik konsantrasyonu, 38 Ar uç konsantrasyonu kullanılarak hesaplanmış, her analizden sonra ekstraksiyon sıcaklığı birkaç dakika için 1800 °C 'ye yükseltilmiş ve bir sonraki analiz için fırın hazırlanarak analiz sürdürülmüştür.…”

“…Volkanitlere ait bir örnekten Sr-Nd, Pb, O izotop analizleri ve K- [32], Erken-Orta Miyosen yüksek K'lu kalk-alkalen kayaçlar (B-Türkiye) [33]- [35], CHUR (Kondritik Uniform Rezervuar)-Sr and -Nd referans çizgileri, EMI (Zenginleşmiş Manto I), ÜM (Üst Manto) [36], [37]; MORB (Okyanus Ortası Sırtı Bazaltı) [38], [19], [39], [40]; Manto aralığı [40]. [36], [37], MORB (Mid-Ocean Ridge Basalt) [38], [19], [ 39], [40], Mantle gap [41].…”