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Petrographical, Geochemical and Perological Characteristics of Late Cretaceous aged Bozat (Giresun, NE Turkey) Pluton

Year 2019, , 454 - 472, 15.07.2019
https://doi.org/10.17714/gumusfenbil.510758

Abstract

Late Cretaceous aged
intrusions in the Eastern Pontides Orogenic Belt in NE Turkey are common in
varying sizes and compositions. Of these, Bozat Pluton (Giresun) extends nearly
in the orientation of NE-SW and was emplaced into the Upper Cretaceous volcanic
and sedimentary rocks. Petrographically, the studied pluton is compositionally
fine to medium grained monzogabbro. The rocks of the pluton consist of
plagioclase (An53-88), orthoclase (Or59-74), quartz,
clinopyroxene (Wo40-45En42-44Fs12-17), biotite
(Mg#: 0.66-0.70), Fe-Ti oxide, apatite and zircon with generally monzonitic,
poikilitic, rare perthitic textures. Petrochemically, the studied pluton shows
I-type, metaluminous (A/CNK=0.76-0.93) and shoshonitic features. The major and
trace element data suggest that fractionational crystallization ± assimilation has
played a significant role in the evolution of the studied pluton. Primitive
mantle-normalized trace element patterns of rocks samples from the pluton
exhibit enrichment in large ion lithophile element, Th, Ce and negative Nb, Ta
and Ti anomalies, all of which suggest subduction component in their
petrogenesis. Moreover, chondrite-normalized rare earth element (REE) 
plots of rocks from the
pluton show characteristic concave-shaped patterns with negative Eu anomalies,
all of which imply significant K-feldspar ± plagioclase and clinopyroxene
fractionations in evolution of the pluton. All obtained data suggest that the
Late Cretaceous aged Bozat Pluton has formed in an extensional continental arc,
and parental magma of the pluton evolved from mixing of lithospheric mantle and
lower crust-derived melts, and evolved differently within crustal level.

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Geç Kretase Yaşlı Bozat (Giresun, KD Türkiye) Plütonu’nun Petrografik, Jeokimyasal ve Petrolojik Özellikleri

Year 2019, , 454 - 472, 15.07.2019
https://doi.org/10.17714/gumusfenbil.510758

Abstract

Doğu Pontidler Orojenik
Kuşağı’nda (KD Türkiye) farklı boyut ve bileşimlerde olan Geç Kretase yaşlı plütonlar
yaygın olarak yüzeylenmektedir. Bunlardan Bozat Plütonu (Giresun) yaklaşık KD-GB
uzanımlı olup, Üst Kretase volkanik ve sedimanter kayaçları içerisine
yerleşmiştir. Petrografik olarak, incelenen plüton ince-orta taneli olup, monzogabro
bileşimlidir. Plüton kayaçları, genel olarak plajiyoklas (An53-88), ortoklas
(Or59-74), kuvars, klinopiroksen (Wo40-45En42-44Fs12-17),
biyotit (Mg#: 0.66-0.70), Fe-Ti oksit, apatit ve zirkon içermekte olup, genellikle
monzonitik, poikilitik, nadiren pertitik doku gösterirler. Petrokimyasal
olarak, incelenen plüton I-tipi, metalümin (A/CNK=0.76-0.93) ve şoşonitik
karakterdedir. Ana ve iz element verileri, incelenen plütonun gelişiminde fraksiyonel
kristallenme
± asimilasyonun önemli bir rol oynadığına işaret
etmektedir. İncelenen plütonun ilksel mantoya normalize edilmiş iz element
dağılımları, büyük iyon yarıçaplı litofil element, Th, Ce zenginleşmesi ve
negative Nb, Ta ve Ti anomalisi göstermekte olup, bu kayaçların petrojenezinde
yitim bileşeninin etkili olduğunu göstermektedir. Ayrıca, incelenen plüton
kayaçlarının kondrite normalize edilmiş nadir toprak element dağılımlarında
karakteristik olarak gözlenen konkav şekilli desen ve negatif Eu anomalisi,
gelişiminde K-feldispat ± plajiyoklas ve klinopiroksen ayrımlaşmasının etkili
olduğuna işaret etmektedir. Elde edilen tüm veriler, Geç Kretase yaşlı Bozat
Plütonu’nun gerilmeli kıtasal yay ortamında oluştuğunu ve ana magmasının
litosferik manto ve alt kabuktan türeyen ergiyiklerin karışımından türediğini
ve kabuk içerisindeki magma odasında farklılaşarak yerleştiğini işaret
etmektedir.

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Details

Primary Language Turkish
Subjects Engineering
Journal Section Articles
Authors

İrfan Temizel 0000-0002-6293-8649

Ayşe Kurt This is me 0000-0003-2981-8335

Publication Date July 15, 2019
Submission Date January 9, 2019
Acceptance Date March 5, 2019
Published in Issue Year 2019

Cite

APA Temizel, İ., & Kurt, A. (2019). Geç Kretase Yaşlı Bozat (Giresun, KD Türkiye) Plütonu’nun Petrografik, Jeokimyasal ve Petrolojik Özellikleri. Gümüşhane Üniversitesi Fen Bilimleri Dergisi, 9(3), 454-472. https://doi.org/10.17714/gumusfenbil.510758