1 Ocak 2015 Dergi makalesi Açık Erişim

Yildiz, Ahmet; Kibici, Yasar; Bagci, Metin; Dumlupunar, Ibrahim; Kocabas, Cumhur; Aritan, A. Ekrem

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{
  "DOI": "10.1007/s12517-015-1991-4", 
  "abstract": "Eocene volcanic rocks from the Central Sakarya Zone in the north of the A degrees zmir-Ankara suture zone (IASZ) are predominantly intermediate-acidic lava flows and pyroclastics that crop out with a W-E orientation. The volcanic rocks include Bozani double dagger lavas, agglomerates, A degrees AYdir lavas, and KapA +/- kaya tuffs. The Bozani double dagger lavas contain plagioclase, hornblende, clinopyroxene, and biotite, whereas the A degrees AYdir lavas consist of plagioclase, hornblende, biotite, and quartz. According to the total alkali-silica (TAS) diagram, the Bozani double dagger lavas are mainly composed of andesite and dacite, with one sample of trachyandesite, whereas the A degrees AYdir lavas mainly contain dacite and minor andesite. Bozani double dagger and A degrees AYdir lavas exhibit moderate- to high-K calc-alkaline character. Major oxide and trace element variations suggest the effects of fractional crystallization in the evolution of the volcanic rocks. N-type mid-ocean ridge basalt (MORB) normalized trace element patterns of the lavas exhibit enrichment in large ion lithophile elements (LILEs; K, Rb, Ba, Th) and depletion in high field strength elements (HFSEs; Zr, Ti, Y). In addition, the chondrite-normalized rare earth element (REE) plots of the rocks show moderately enriched and nearly concave-shaped patterns (La-N/Yb-N = 5.4-17.6 for the Bozani double dagger lavas and 6.5-13.1 for the A degrees AYdir lavas), suggesting clinopyroxene (Cpx) and hornblende dominated fractionation. Negative Eu anomalies in the acidic lavas reveal plagioclase fractionation. Some trace element ratios of the lavas demonstrate a subduction signature and crustal contamination in the generation of the parent magma(s). Multi-dimensional tectonic discrimination diagrams suggest that the studied volcanic rocks have developed in a collisional setting.", 
  "author": [
    {
      "family": "Yildiz", 
      "given": " Ahmet"
    }, 
    {
      "family": "Kibici", 
      "given": " Yasar"
    }, 
    {
      "family": "Bagci", 
      "given": " Metin"
    }, 
    {
      "family": "Dumlupunar", 
      "given": " Ibrahim"
    }, 
    {
      "family": "Kocabas", 
      "given": " Cumhur"
    }, 
    {
      "family": "Aritan", 
      "given": " A. Ekrem"
    }
  ], 
  "container_title": "ARABIAN JOURNAL OF GEOSCIENCES", 
  "id": "76415", 
  "issue": "12", 
  "issued": {
    "date-parts": [
      [
        2015, 
        1, 
        1
      ]
    ]
  }, 
  "page": "11239-11260", 
  "title": "Petrogenesis of the post-collisional Eocene volcanic rocks from the Central Sakarya Zone (Northwestern Anatolia, Turkey): Implications for source characteristics, magma evolution, and tectonic setting", 
  "type": "article-journal", 
  "volume": "8"
}