Geodynamic Significance of the Early Triassic Karaburun Granitoid (Western Turkey) for the Opening History of Neo-Tethys

Cüneyt AKAL; O. Ersin KORALAY; Osman CANDAN

Makale detayları

Geodynamic Significance of the Early Triassic Karaburun Granitoid (Western Turkey) for the Opening History of Neo-Tethys

Yazarlar:

Cüneyt AKAL | O. Ersin KORALAY | Osman CANDAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Earth Sciences 2011 Vol.20 Issue 3, pp.255-271

Belge Tipi:

Makale

Yayın Tarihi:

2/2011

Belge Dili:

Türkçe

Document ID (Org No.):

2000732097

Sıklık:

İki Aylık

eISSN:

1303-619X

pISSN:

1300-0985

Özet:

 

The Karaburun Peninsula, which is considered part of the Anatolide-Tauride Block of Turkey, contains clastic and carbonate sequences deposited on the northern margin of Gondwana. The Palaeozoic clastic sequence, which is intruded by the Early Triassic granitoid and tectonically overlies a Mesozoic mélange sequence, can be divided into three subunits: a lower clastic subunit consisting of a sandstone-shale alternation, an upper clastic subunit consisting of black chert-bearing shales, sandstone and conglomerate, and a Permo-Carboniferous carbonate subunit. The lower Triassic Karaburun I-type granitoid has a high initial 87Sr/86Sr ratio (0.709021-0.709168), and low 143Nd/144Nd ratio (0.512004-0.512023) and eNd (-5.34 to -5.70) isotopic values. Geochronological data indicate a crystallization (intrusion) age of 247.1±2.0 Ma (Scythian). Geochemically, the acidic magmatism reflects a subduction-related continental-arc basin tectonic setting, which can be linked to the opening of the northern branch of Neo-Tethys as a continental back-arc rifting basin on the northern margin of Gondwana. This can be related to the closure through southward subduction of the Palaeotethys Ocean beneath Gondwana.

 

The Karaburun Peninsula, which is considered part of the Anatolide-Tauride Block of Turkey, contains clastic and carbonate sequences deposited on the northern margin of Gondwana. The Palaeozoic clastic sequence, which is intruded by the Early Triassic granitoid and tectonically overlies a Mesozoic mélange sequence, can be divided into three subunits: a lower clastic subunit consisting of a sandstone-shale alternation, an upper clastic subunit consisting of black chert-bearing shales, sandstone and conglomerate, and a Permo-Carboniferous carbonate subunit. The lower Triassic Karaburun I-type granitoid has a high initial 87Sr/86Sr ratio (0.709021-0.709168), and low 143Nd/144Nd ratio (0.512004-0.512023) and eNd (-5.34 to -5.70) isotopic values. Geochronological data indicate a crystallization (intrusion) age of 247.1±2.0 Ma (Scythian). Geochemically, the acidic magmatism reflects a subduction-related continental-arc basin tectonic setting, which can be linked to the opening of the northern branch of Neo-Tethys as a continental back-arc rifting basin on the northern margin of Gondwana. This can be related to the closure through southward subduction of the Palaeotethys Ocean beneath Gondwana.

Makale detayları

Geodynamic Significance of the Early Triassic Karaburun Granitoid (Western Turkey) for the Opening History of Neo-Tethys

Yazarlar: Cüneyt AKAL | O. Ersin KORALAY | Osman CANDAN

Yayıncı: TUBITAK

Dergi: Turkish Journal of Earth Sciences 2011 Vol.20 Issue 3, pp.255-271

Belge Tipi: Makale

Yayın Tarihi: 2/2011

Belge Dili: Türkçe

Document ID (Org No.): 2000732097

Sıklık: İki Aylık

eISSN: 1303-619X

pISSN: 1300-0985

Sayı

Yazarlar:

Cüneyt AKAL | O. Ersin KORALAY | Osman CANDAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Earth Sciences 2011 Vol.20 Issue 3, pp.255-271

Belge Tipi:

Makale

Yayın Tarihi:

2/2011

Belge Dili:

Türkçe

Document ID (Org No.):

2000732097

Sıklık:

İki Aylık

eISSN:

1303-619X

pISSN:

1300-0985