Eruptive recurrence and magma accumulation for Quaternary stratovolcanoes in Central Anatolia

Erciyes Dagi和Hasan Dagi是安纳托利亚中部最大的两座成层火山。这两座火山都被认为是活跃的，仅在Erciyes Dagi附近就有超过100万人居住。这一评估主要基于土耳其独特的人类存在的长期考古记录，这些记录为从史前到历史时期的Erciyes Dagi和Hasan Dagi的同时代火山爆发提供了初步证据。然而，这两座火山的喷发年龄没有得到很好的量化，因此它们对过去文化演变的影响和对现代社会的潜在威胁仍然很微弱。本研究旨在研究Erciyes Dagi和Hasan Dagi晚更新世至全新世火山活动的时间和潜在的岩浆过程。对于这两个火山最近的存款，结合铀系列不平衡和（U-Th）/He定年将适用于副矿物锆石，以准确地限制喷发复发。为了更好地了解支撑火山的岩浆系统的长期演化，将使用铀系锆石结晶年龄以及锆石的化学和同位素组成。锆石是独特的惰性对扩散的地质年代学和地球化学的重要微量元素，使它可以记录的时间的热演化和成分的岩浆在绝对和延长的时间尺度。这超越了对火山岩的传统分析，传统分析只能在爆发前立即观察岩浆的物理和化学状态。由于岩浆中锆石结晶的温度依赖性，锆石非常适合量化岩浆聚集和冷却的速率。两个相邻的火山的比较研究允许测试模型的重要性，如冰川-冰消循环的火山爆发的频率外生过程。总的来说，这些数据是至关重要的重新评估第四纪火山喷发记录在东地中海和黑海地区，与气候和考古档案的年代测定和评估该地区的火山灾害的影响。这一建议的更广泛影响是进一步发展与土耳其科学家在安纳托利亚中部火山方面的合作研究，促进学生和研究人员的国际交流，并提高公众对欧亚十字路口这一重要地区火山危害的认识。

Erciyes Dagi and Hasan Dagi are the two largest stratovolcanoes in Central Anatolia. Both volcanoes are considered active, with more than 1 Million people residing in close proximity to Erciyes Dagi alone. This assessment is largely based on Turkey's uniquely protracted archaeological record of human presence which yielded tentative evidence for coeval volcanic eruptions of Erciyes Dagi and Hasan Dagi from prehistoric to historic times. Eruption ages of both volcanoes, however, are poorly quantified, and their impacts on past cultural evolution and potential threats for modern society therefore remain tenuous. This proposal is to study the timing and underlying magmatic processes of late Pleistocene to Holocene volcanism of Erciyes Dagi and Hasan Dagi. For the most recent deposits of both volcanoes, combined uranium series disequilibrium and (U-Th)/He dating will be applied to the accessory mineral zircon to accurately constrain eruptive recurrence. To better understand the long-term evolution of the magmatic systems underpinning both volcanoes, uranium series zircon crystallization ages, as well as the chemical and isotopic composition of zircon will be used. Zircon is uniquely inert against diffusion of geochronologically and geochemically important trace elements so that it can record the timing of the thermal and compositional evolution of magmas at absolute and protracted timescales. This transcends conventional analysis of volcanic rocks, which can only yield an instantaneous view into the physical and chemical state of magma immediately before eruption. Because of the temperature dependence of zircon crystallization in magmas, zircon is ideally suited to quantify rates of magma accumulation and cooling. The comparative investigation of two neighboring volcanoes allows testing of models regarding the importance of exogenic processes such as glaciation-deglaciation cycling on the frequency of volcanic eruptions. Collectively, these data are critical for the re-evaluation of Quaternary tephra records in the Eastern Mediterranean and Black Sea regions, with implications for dating of climate and archaeological archives and the assessments of volcanic hazards in this region. Broader impacts of this proposal are to further develop collaborative research on volcanoes in Central Anatolia with Turkish scientists, to promote international exchange of students and researchers, and to raise public awareness for volcanic hazards in an important region at the crossroads between Europe and Asia.