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

Abstract

IntroductionZircon is an accessory mineral ubiquitous in felsic to mafic magmatic suites and its chemical and physical resistivity also makes zircon a valuable archive for geological processes throughout Earth's history (Schaltegger and Davies, 2017). Due to zircon's high resistance to alteration and postmagmatic heating, it is also widely used in the studies concerning recent magmatic processes through trace element analyses (e.g., Ti, Y, REE, Hf) and radiometric dating (U/Th, U/Pb, Pb/Pb) yielding crystallization ages for cooling magma chambers. Where zircon crystallization occurs over a significant time span, compositional zoning within individual zircon grains, or differences in composition between successive generations of zircon, can record the changes in the chemical environment of preeruptive magmas (Belousova et al., 2006). Zircon crystals also display highly various crystal habits, which are thought to be controlled by the thermochemical conditions in their crystallization environments. Different zircon crystal morphologies may result from different magma compositions (e.g., aluminum-alkali balance) and crystallization temperatures Turco, 1972, 1975;Pupin, 1976).The detailed work of Pupin (1980) on granitic zircon populations defined three main genetic categories:(1) granites of crustal or mainly crustal origin [(sub) autochthonous and aluminous granites)]; (2) granites of crustal + mantle origin, hybrid granites (calc-alkaline and subalkaline series granites); and (3) granites of mantle or mainly mantle origin (alkaline and tholeiitic series granites). Since this early work, new experimentally calibrated thermometers for zircon have emerged, posing

Granitik Buzul Çakıllarında Zirkon Tipolojisi Çalışması: Toridler’den Örnek Bir Çalışma (Türkiye)

“…Genel itibariyle, Pupin (1980) gruplamasında yer alan 1, 2 ve 3. gruplar S-tipi granitoyid, 4 ve 5. gruplar I-tipi hibrit granitoyid ve manto kaynaklı alkalen 6. grup ise A-tipi granitoyid tanımına uymaktadır (Schermaier et al 1992. Öncel çalışmalarda; Türkiye'deki kayaçlara nadir de olsa uygulanmış olan zirkon tipolojisi yöntemi, önemli petrolojik veriler sağlamıştır (Köksal et al 2008, Akın et al 2019.…”