Post-Collisional Central Anatolian Alkaline Plutonism, Turkey

Durmus BOZTUG

Article Details

Post-Collisional Central Anatolian Alkaline Plutonism, Turkey

Authors:

Durmus BOZTUG

Publisher:

TUBITAK

Journal:

Turkish Journal of Earth Sciences 1998 Vol.7 Issue 3, pp.145-166

Document Type:

Article

Publication Date:

2/1998

Document Language:

Turkish

Document ID (Org No.):

2000733016

Frequency:

Bimonthly

eISSN:

1303-619X

pISSN:

1300-0985

Abstract:

 

A number of Upper Cretaceous-Palaeogene alkaline plutons intruded into the crustal metamorphic rocks, the pre-Maastrichtian  ophiolitic mélange, and the Cretaceous-Lower Tertiary units are located in the Central Anatolia (CA), Turkey. These  alkaline plutons constitute an important association in the post-collisional Central Anatolian Granitoids. The Dumluca, Murmana,  Karakeban, Kösedağ, Hasançelebi, Karaçayir and Davulalan plutons constitute the eastern; whereas the Egrialan, Baranadağ, Hamit,  Çamsarı, Durmuslu and Bayindir units the western part of this alkaline association. These plutons are mainly composed of silica  oversaturated syenitic to monzonitic, and undersaturated syenitic felsic rocks. However, the Dumluca, Murmana and Karakeban  plutons also include some undersaturated alkaline mafic rocks which are derived from a different mafic magma source rather than  being the early fractionation derivatives of the felsic rocks in these plutons. There are some diversification or subdivisions on the  basis of mineralogical-chemical characteristics, wall-rock, silica saturation and associated ore deposit/mineralization in these alkaline  plutons. The diversification is thought to be sourced from either some solidification processes which modify the primary composition  of any mantle-derived magma, or some different alkaline magma pulses generated by the partial melting of mantle material with  different types and degrees of partial melting processes in water-starved environment. The latter consideration seems to be more  reasonable due particularly to LIL and F enrichments in these rocks. They apparently indicate "late orogenic" , "within plate granite  (WPG)" and "post-collisional" characteristics on the basis of their major and trace element geochemistry. When the mineralogical-chemical  data is considered together with the space-time relations in a regional geological setting, one can suggest such a geodynamic  model for the CA post-collisional alkaline plutonism: The magma source of this plutonism can be derived from the partial melting of  upwelling upper mantle material by the adiabatic decompression mechanism in the passive margin of the Anatolides in a post-collisional  lithospheric attenuation environment within a tensional regime immediately after crustal thickening due to Anatolide-Pontide  collision along the northward subduction zone of the northern branch of Neo-Tethys.

 

A number of Upper Cretaceous-Palaeogene alkaline plutons intruded into the crustal metamorphic rocks, the pre-Maastrichtian  ophiolitic mélange, and the Cretaceous-Lower Tertiary units are located in the Central Anatolia (CA), Turkey. These  alkaline plutons constitute an important association in the post-collisional Central Anatolian Granitoids. The Dumluca, Murmana,  Karakeban, Kösedağ, Hasançelebi, Karaçayir and Davulalan plutons constitute the eastern; whereas the Egrialan, Baranadağ, Hamit,  Çamsarı, Durmuslu and Bayindir units the western part of this alkaline association. These plutons are mainly composed of silica  oversaturated syenitic to monzonitic, and undersaturated syenitic felsic rocks. However, the Dumluca, Murmana and Karakeban  plutons also include some undersaturated alkaline mafic rocks which are derived from a different mafic magma source rather than  being the early fractionation derivatives of the felsic rocks in these plutons. There are some diversification or subdivisions on the  basis of mineralogical-chemical characteristics, wall-rock, silica saturation and associated ore deposit/mineralization in these alkaline  plutons. The diversification is thought to be sourced from either some solidification processes which modify the primary composition  of any mantle-derived magma, or some different alkaline magma pulses generated by the partial melting of mantle material with  different types and degrees of partial melting processes in water-starved environment. The latter consideration seems to be more  reasonable due particularly to LIL and F enrichments in these rocks. They apparently indicate "late orogenic" , "within plate granite  (WPG)" and "post-collisional" characteristics on the basis of their major and trace element geochemistry. When the mineralogical-chemical  data is considered together with the space-time relations in a regional geological setting, one can suggest such a geodynamic  model for the CA post-collisional alkaline plutonism: The magma source of this plutonism can be derived from the partial melting of  upwelling upper mantle material by the adiabatic decompression mechanism in the passive margin of the Anatolides in a post-collisional  lithospheric attenuation environment within a tensional regime immediately after crustal thickening due to Anatolide-Pontide  collision along the northward subduction zone of the northern branch of Neo-Tethys.

Article Details

Post-Collisional Central Anatolian Alkaline Plutonism, Turkey

Authors: Durmus BOZTUG

Publisher: TUBITAK

Journal: Turkish Journal of Earth Sciences 1998 Vol.7 Issue 3, pp.145-166

Document Type: Article

Publication Date: 2/1998

Document Language: Turkish

Document ID (Org No.): 2000733016

Frequency: Bimonthly

eISSN: 1303-619X

pISSN: 1300-0985

Issues

Authors:

Durmus BOZTUG

Publisher:

TUBITAK

Journal:

Turkish Journal of Earth Sciences 1998 Vol.7 Issue 3, pp.145-166

Document Type:

Article

Publication Date:

2/1998

Document Language:

Turkish

Document ID (Org No.):

2000733016

Frequency:

Bimonthly

eISSN:

1303-619X

pISSN:

1300-0985