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Cretaceous island arc initiation in the troodosophiolite, Cyprus

Başlık çevirisi mevcut değil.

  1. Tez No: 785231
  2. Yazar: ELİF DİLEK BİLGİN
  3. Danışmanlar: DR. ANDREW MCCAİG, DR. IVAN SAVOV
  4. Tez Türü: Yüksek Lisans
  5. Konular: Coğrafya, Jeodezi ve Fotogrametri, Geography, Geodesy and Photogrammetry
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2018
  8. Dil: İngilizce
  9. Üniversite: University of Leeds
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 104

Özet

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Özet (Çeviri)

Troodos ophiolite is known as one of the best examples of Mesozoic oceanic crust exposed on land. The ophiolite has been well-studied by different researchers for many years and described as one of the ophiolites formed at a spreading centre above a subduction zone. So-called supra-subduction zone (SSZ) ophiolites like Troodos have similar geochemical affinities with the volcanic and mantle rocks recovered by IODP from modern forearc and rear arc intra-oceanic settings. They may even hold magmatic records similar to those of settings like the currently active Izu-Bonin-Marianas (IBM) arc-basin system, which uniquely records voluminous (so-called forearc basalt or FAB) volcanism during subduction initiation. In this study, sixty bulk rock and glass samples were collected from the dykes and pillow lavas of the Troodos ophiolite. Bulk rock and glass samples were analysed for their major and trace elements, as well as for in-situ mineral chemistry (pyroxene, spinel) in selected samples. The geochemistry of bulk rock and glass samples is compared with the geochemistry of samples from the IBM arc and with previous studies of the Troodos ophiolite. Some of the studied samples show similar trace elements (incl. REE) patterns to previously studied boninitesfrom the Troodos ophiolite. These rocks have enrichment in LILE (Rb, Sr) compared to the HFSE (Ta, Nb, Hf) and show spoon-shaped REE patterns. Other samples from this study that are in close special relations with the boninites (cross-cutting dykes or in the same outcrops) have similar trace element abundances to FABs from the IBM. These FAB-like samples show depletion in all trace elements, often an order of magnitude compared with basalts erupted at oceanic spreading centres in MOR or back arc settings. Comparison between the major and trace element geochemistry of the IBM and the samples from this study reveal, for the first time, the presence of FAB-like samples in the Troodos ophiolite. The FAB-like samples in Troodos ophiolite provide support for recently proposed tectonic models suggesting that the Troodos ophiolite may have formed in a subduction initiation setting.

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