Post-collisional shift from polygenetic to monogenetic volcanism revealed by new 40Ar/39Ar ages in the southern Lesser Caucasus (Armenia)
نویسندگان
چکیده
The post-collisional Syunik and Vardenis volcanic highlands, located in the southern Lesser Caucasus mountains (part of Arabia-Eurasia collision zone) are host to over 200 monogenetic volcanoes, as well 2 large Quaternary polygenetic volcanoes highland. latter overlain by lavas from suggesting there was a transition style activity large-volume central vent eruptions dispersed small-volume eruptions. 12 new high quality 40Ar/39Ar ages presented here, with 11 calculated step-heating experiments on groundmass separates, final age obtained total fusions population sanidines. All were younger than 1.5 Ma, except for one ignimbrite deposit whose sanidines gave an 6 Ma. While bulk exposed products volcanism relate Pleistocene activity, it is clear has been active region since at least late Miocene. highland 1 but north geochronological evidence 1.4 1.3 An Ma determined lava flow volcanoes- Tskhouk, when combined other helps constrain timing around illustrate degree spatio-temporal coupling formation vents, which could be related pull-apart basins focussing ascending magmas. This means that future particularly likely occur close sites most recent Holocene activity. argued result decreasing magma supply based on: (i) volume estimates all their flows Syunik; (ii) stratigraphy shows Pliocene- early continental flood basalts being succeeded few andesite-dacite then deposits consisting scoria cones. highest density centres Caucasus, taken indicate this flux, therefore last location volcanism, why clearly seen there. There no Sr-Nd-B isotope measurements exhaustion fusible slab components mantle source, showing inherited signature can survive millions years after end subduction. Although currently waning, pulse possible.
منابع مشابه
Post-Collisional Plio-Pleistocene Adakitic Volcanism in Centeral Iranian Volcanic Belt:Geochemical
In the Central IranianVolcanic Belt (CIVB), north-west of Shahre-Babak, in the area of Javazm, Dehaj and khabr, about 60 subvolcanic porphyritic dacitic to rhyodacitic domes (1-10 km2) are intruded into a variety of rock sequences from Mesozoic to Early Miocene in age. These rocks are a part of Dehaj-Sardoieh belt. The CIVB contains intrusive and extrusive rocks of Cretaceous-Quaternary age. Ge...
متن کاملStress Controls of Monogenetic Volcanism: A Review
The factors controlling the preparation of volcanic eruptions in monogenetic fields are still poorly understood. The fact that in monogenetic volcanism each eruption has a different vent suggests that volcanic susceptibility has a high degree of randomness, so that accurate forecasting is subjected to a very high uncertainty. Recent studies on monogenetic volcanism reveal how sensitive magma mi...
متن کاملfrom linguistics to literature: a linguistic approach to the study of linguistic deviations in the turkish divan of shahriar
chapter i provides an overview of structural linguistics and touches upon the saussurean dichotomies with the final goal of exploring their relevance to the stylistic studies of literature. to provide evidence for the singificance of the study, chapter ii deals with the controversial issue of linguistics and literature, and presents opposing views which, at the same time, have been central to t...
15 صفحه اولthe role of russia in transmission of energy from central asia and caucuses to european union
پس ازفروپاشی شوروی،رشد منابع نفت و گاز، آسیای میانه و قفقاز را در یک بازی ژئوپلتیکی انرژی قرار داده است. با در نظر گرفتن این منابع هیدروکربنی، این منطقه به یک میدانجنگ و رقابت تجاری برای بازی های ژئوپلتیکی قدرت های بزرگ جهانی تبدیل شده است. روسیه منطقه را به عنوان حیات خلوت خود تلقی نموده و علاقمند به حفظ حضورش می باشد تا همانند گذشته گاز طبیعی را به وسیله خط لوله مرکزی دریافت و به عنوان یک واس...
15 صفحه اولذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Volcanology and Geothermal Research
سال: 2021
ISSN: ['0377-0273', '1872-6097']
DOI: https://doi.org/10.1016/j.jvolgeores.2021.107192