Al-in-Hornblende Thermobarometry and Sr-Nd-O-Pb Isotopic Compositions of the Early Miocene Alaçam Granite in NW Anatolia (Turkey)

ALTUĞ HASÖZBEK; BURHAN ERDOĞAN; MUHARREM SATIR; WOLFGANG SIEBEL

Makale detayları

Al-in-Hornblende Thermobarometry and Sr-Nd-O-Pb Isotopic Compositions of the Early Miocene Alaçam Granite in NW Anatolia (Turkey)

Yazarlar:

ALTUĞ HASÖZBEK | BURHAN ERDOĞAN | MUHARREM SATIR | WOLFGANG SIEBEL

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Earth Sciences 2012 Vol.21 Issue 1, pp.37-52

Belge Tipi:

Makale

Yayın Tarihi:

12/2011

Belge Dili:

Türkçe

Document ID (Org No.):

2000731995

Sıklık:

İki Aylık

eISSN:

1303-619X

pISSN:

1300-0985

Özet:

 

During and after the closure of the Neo-Tethyan Ocean and progressive collision of the Tauride-Anatolide Platform with the Sakarya Continent, widespread magmatism occurred in NW Anatolia. This magmatism is manifested in a NW-trending belt along the northern border of the Menderes Massif. Due to the complex geodynamic setting of this region, the exact emplacement depth of the granitoids is still a matter of debate. Here we present Al-in-hornblende barometrical data and Sr-Nd-Pb isotope compositions of the Early Miocene Alaçam granite. The results imply a shallow emplacement depth of this granite (4.7±1.6 km) in contrast to previous studies which suggested emplacement along the brittle-ductile boundary of the crust. Furthermore, an evaluation of literature data let us reconsider the general emplacement mechanism of the Alaçam and other Early Miocene granitoids in the region. Initial isotopic signatures of the Alaçam granite are 87Sr/86Sr(I)= 0.70865-0.70915, eNd(I)= -5.8 to -6.4, d18O= 9.5-10.5, 206Pb/204Pb isotope ratios vary between 18.87 and 18.90. These features indicate an assimilation-dominated crustal crystallization and melt derivation from an older middle crustal protolith.

 

During and after the closure of the Neo-Tethyan Ocean and progressive collision of the Tauride-Anatolide Platform with the Sakarya Continent, widespread magmatism occurred in NW Anatolia. This magmatism is manifested in a NW-trending belt along the northern border of the Menderes Massif. Due to the complex geodynamic setting of this region, the exact emplacement depth of the granitoids is still a matter of debate. Here we present Al-in-hornblende barometrical data and Sr-Nd-Pb isotope compositions of the Early Miocene Alaçam granite. The results imply a shallow emplacement depth of this granite (4.7±1.6 km) in contrast to previous studies which suggested emplacement along the brittle-ductile boundary of the crust. Furthermore, an evaluation of literature data let us reconsider the general emplacement mechanism of the Alaçam and other Early Miocene granitoids in the region. Initial isotopic signatures of the Alaçam granite are 87Sr/86Sr(I)= 0.70865-0.70915, eNd(I)= -5.8 to -6.4, d18O= 9.5-10.5, 206Pb/204Pb isotope ratios vary between 18.87 and 18.90. These features indicate an assimilation-dominated crustal crystallization and melt derivation from an older middle crustal protolith.

Makale detayları

Al-in-Hornblende Thermobarometry and Sr-Nd-O-Pb Isotopic Compositions of the Early Miocene Alaçam Granite in NW Anatolia (Turkey)

Yazarlar: ALTUĞ HASÖZBEK | BURHAN ERDOĞAN | MUHARREM SATIR | WOLFGANG SIEBEL

Yayıncı: TUBITAK

Dergi: Turkish Journal of Earth Sciences 2012 Vol.21 Issue 1, pp.37-52

Belge Tipi: Makale

Yayın Tarihi: 12/2011

Belge Dili: Türkçe

Document ID (Org No.): 2000731995

Sıklık: İki Aylık

eISSN: 1303-619X

pISSN: 1300-0985

Sayı

Yazarlar:

ALTUĞ HASÖZBEK | BURHAN ERDOĞAN | MUHARREM SATIR | WOLFGANG SIEBEL

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Earth Sciences 2012 Vol.21 Issue 1, pp.37-52

Belge Tipi:

Makale

Yayın Tarihi:

12/2011

Belge Dili:

Türkçe

Document ID (Org No.):

2000731995

Sıklık:

İki Aylık

eISSN:

1303-619X

pISSN:

1300-0985