Application of zircon typology method to felsic rocks (Cappadocia, Central Anatolia, Turkey): a zircon crystallization temperature perspective

Lütfiye AKIN; Erkan AYDAR; Axel Karl SCHMITT; Hüseyin Evren ÇUBUKÇU

Makale detayları

Application of zircon typology method to felsic rocks (Cappadocia, Central Anatolia, Turkey): a zircon crystallization temperature perspective

Yazarlar:

Lütfiye AKIN | Erkan AYDAR | Axel Karl SCHMITT | Hüseyin Evren ÇUBUKÇU

Yayıncı:

TUBITAK

Ana Başlıklar:

Uygulamalı fizik

Dergi:

Turkish Journal of Earth Sciences 2019 Vol.28 Issue 3, pp.351-371

Belge Tipi:

Makale

Yayın Tarihi:

5/2019

Belge Dili:

İngilizce

Document ID (Org No.):

2000731028

Sıklık:

İki Aylık

eISSN:

1303-619X

pISSN:

1300-0985

Özet:

 

Zircon typology was developed nearly half a century ago as a tool for constraining the thermochemical conditions in granitic magmas  from  the  morphology  of  zircon  prismatic  and  pyramidal  crystal  surfaces.  Although  the  method  precedes  experimentally  constrained  zircon-based  thermometers  (zircon  saturation,  Ti-in-zircon),  the  morphology  of  zircon  remains  an  important  criterion  for zircon studies commonly relying on visual recognition of crystals during sample purification via hand-picking. This may introduce selection  bias  if  morphologically  distinct  zircon  crystals  are  present  in  a  population.  We  conducted  a  comparison  between  zircon  typology  and  thermochemical  constraints  from  zircon  thermometry  and  whole  rock  compositions.  Therefore,  we  focused  on  zircon  populations  from  diverse  volcanic  rocks  from  the  Central  Anatolian  Volcanic  Province  (CAVP),  which  erupted  during  the  Upper  Miocene to Quaternary in a continental environment in a postcollisional extensional regime. Neogene rhyolitic volcanism produced widespread pyroclastic rocks (ignimbrites, and subordinate fall-out deposits), which are interstratified with fluviolacustrine sediments and  local  lava  flows  originating  from  various  volcanic  centers  in  the  region.  Zircon  crystals  from  Neogene  ignimbrites  are  mostly  intermediate-temperature, calc-alkaline hybrid type, whereas zircons from Quaternary rhyolitic domes/lavas fall into typology trends assigned  to  subalkaline  mantle-type  granites  with  low  temperatures  and  high  alkalinity  indices.  Trends  in  zircon  saturation  and  zircon crystallization temperatures in CAVP ignimbrites are broadly consistent with typology temperature estimates, but temperature differences  between  these  estimates  are  slightly  higher  or  lower.  However,  these  deviations  may  partly  result  from  zircon  typology  relying  on  crystal  shape,  and  thus  the  latest  crystallization  event,  which  could  result  in  bias  between  the  granitic  rocks  used  for  the  original typology development and the volcanic rocks investigated here. Our results show that typology differences exist between zircon populations from both Miocene ignimbrites and Quaternary rhyolitic domes/lavas of the CAVP. These differences affect the temperature values obtained from zircon typologies that also correlate with conventional quantitative thermometric calculations.

Makale detayları

Application of zircon typology method to felsic rocks (Cappadocia, Central Anatolia, Turkey): a zircon crystallization temperature perspective

Yazarlar: Lütfiye AKIN | Erkan AYDAR | Axel Karl SCHMITT | Hüseyin Evren ÇUBUKÇU

Yayıncı: TUBITAK

Ana Başlıklar: Uygulamalı fizik

Dergi: Turkish Journal of Earth Sciences 2019 Vol.28 Issue 3, pp.351-371

Belge Tipi: Makale

Yayın Tarihi: 5/2019

Belge Dili: İngilizce

Document ID (Org No.): 2000731028

Sıklık: İki Aylık

eISSN: 1303-619X

pISSN: 1300-0985

Sayı

Yazarlar:

Lütfiye AKIN | Erkan AYDAR | Axel Karl SCHMITT | Hüseyin Evren ÇUBUKÇU

Yayıncı:

TUBITAK

Ana Başlıklar:

Uygulamalı fizik

Dergi:

Turkish Journal of Earth Sciences 2019 Vol.28 Issue 3, pp.351-371

Belge Tipi:

Makale

Yayın Tarihi:

5/2019

Belge Dili:

İngilizce

Document ID (Org No.):

2000731028

Sıklık:

İki Aylık

eISSN:

1303-619X

pISSN:

1300-0985