Contemporaneous Late Cretaceous Calc-alkaline and Alkaline Magmatism in Central Anatolia, Turkey: O Isotope Constraints on Petrogenesis

Mustafa Kemal University; İskenderun Campus; Faculty of Engineering; TR&#; Hatay

Makale detayları

Contemporaneous Late Cretaceous Calc-alkaline and Alkaline Magmatism in Central Anatolia, Turkey: O Isotope Constraints on Petrogenesis

Yazarlar:

Mustafa Kemal University | İskenderun Campus | Faculty of Engineering | TR&#; Hatay

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Earth Sciences 2009 Vol.18 Issue 4, pp.529-547

Belge Tipi:

Makale

Yayın Tarihi:

3/2009

Belge Dili:

Türkçe

Document ID (Org No.):

2000732302

Sıklık:

İki Aylık

eISSN:

1303-619X

pISSN:

1300-0985

Özet:

 

A wide variety of rock types were produced by the latest Cretaceous magmatism in the Central Anatolian Crystalline Complex. These rocks can be divided into three distinct units: (i) calc-alkaline, (ii) subalkaline/transitional, and (iii) alkaline. The calc-alkaline rocks are mainly metaluminous (I-type) ranging from monzodiorite to granite. The subalkaline/transitional rocks are also metaluminous (I-type) ranging from monzonite to granite. The alkaline rocks are mainly peralkaline (A-type), ranging from feldspathoid-bearing monzosyenite to granite. Whole-rock oxygen isotope data from the complex have a considerable range of d18O values between 6.5 per thousand and 14.8 per thousand. Initial 87Sr/86Sr versus 143Nd/144Nd ratios, and both ratios versus d18O values diagrams show that the intrusive rocks are derived from a subduction-modified mantle and also have experienced fractional crystallisation coupled with crustal assimilation. Delamination of a thermal boundary layer, and/or slab breakoff is the likely mechanisms for the initiation of the diverse magmatism in the complex.

 

A wide variety of rock types were produced by the latest Cretaceous magmatism in the Central Anatolian Crystalline Complex. These rocks can be divided into three distinct units: (i) calc-alkaline, (ii) subalkaline/transitional, and (iii) alkaline. The calc-alkaline rocks are mainly metaluminous (I-type) ranging from monzodiorite to granite. The subalkaline/transitional rocks are also metaluminous (I-type) ranging from monzonite to granite. The alkaline rocks are mainly peralkaline (A-type), ranging from feldspathoid-bearing monzosyenite to granite. Whole-rock oxygen isotope data from the complex have a considerable range of d18O values between 6.5 per thousand and 14.8 per thousand. Initial 87Sr/86Sr versus 143Nd/144Nd ratios, and both ratios versus d18O values diagrams show that the intrusive rocks are derived from a subduction-modified mantle and also have experienced fractional crystallisation coupled with crustal assimilation. Delamination of a thermal boundary layer, and/or slab breakoff is the likely mechanisms for the initiation of the diverse magmatism in the complex.

Makale detayları

Contemporaneous Late Cretaceous Calc-alkaline and Alkaline Magmatism in Central Anatolia, Turkey: O Isotope Constraints on Petrogenesis

Yazarlar: Mustafa Kemal University | İskenderun Campus | Faculty of Engineering | TR&#; Hatay

Yayıncı: TUBITAK

Dergi: Turkish Journal of Earth Sciences 2009 Vol.18 Issue 4, pp.529-547

Belge Tipi: Makale

Yayın Tarihi: 3/2009

Belge Dili: Türkçe

Document ID (Org No.): 2000732302

Sıklık: İki Aylık

eISSN: 1303-619X

pISSN: 1300-0985

Sayı

Yazarlar:

Mustafa Kemal University | İskenderun Campus | Faculty of Engineering | TR&#; Hatay

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Earth Sciences 2009 Vol.18 Issue 4, pp.529-547

Belge Tipi:

Makale

Yayın Tarihi:

3/2009

Belge Dili:

Türkçe

Document ID (Org No.):

2000732302

Sıklık:

İki Aylık

eISSN:

1303-619X

pISSN:

1300-0985