Magmatic signature of the closure of the north ern branch of the Neo-Tethys: upper paleocene-middle eocene magmatism at the boundary of the TavêanlÏ Sakarya Zone (Turkey)
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Tarih
2022
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Yayıncı
Polish Geological Institute
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Nu mer ous plutons com posed of gran ite, granodiorite, diorite-por phyry, monzonite, granodiorite-por phyry and diorite/microdiorite-por phyry oc cur at the bound ary of the TavêanlÏ-Sakarya Zone, in the east ern part of the north west ern Ana to lian mag matic belt, Tur key. These rocks be long to two dif fer ent types: A me dium-K calc-al ka line granodiorite se ries (with as so ci ated dykes and sub-vol ca nic rocks) and a shoshonitic se ries of gran ites. The rocks of the shoshonitic se ries have SiO2 from 67.5 to 75.6 wt.% with Mg# from 35.1 to 59.5, whereas the me dium-K calc-al ka line se ries rocks have SiO2 be tween 54.6 and 67.7 wt.% with Mg# from 43.5 to 60.8. There is a clear en rich ment of LILE with re spect to the HFSE in all mag matic units of the re gion. These mag matic rocks re flect prop er ties of col li sion-re lated arc magmatism in the var i ous geo chem i cal dis crim i na tion di a grams. The ini tial 87Sr/86Sr and 143Nd/144Nd istopic ra tios of the mag matic units range from 0.705506 to 0.710902 and 0.512178 to 0.512594, re spec tively. Col li sion-re lated granitoids yielded a 40Ar/39Ar cool ing age age of 59.13 ±1.87 Ma, and arc-re lated granitoids and as so ci ated sub-vol ca nic units 44.3 ±0.47 and 44.11 ±0.89 Ma. The data ob tained re vealed that con ti nent-con ti nent col li sion in the Paleocene to gether with the ini ti a tion of the clo sure of the Neo-Tethys took place be tween the Anatolide-Tauride Plat form and Sakarya Plate from the end of the Cre ta ceous. The shoshonotic gran ite may cooled in the Mid dle Paleocene, as re gards the subduction-ac cre tion zone in which subduction im pacts have been observed. The me dium-K calc-al ka line mag matic prod ucts in the re gion were formed by par tial melt ing of the con ti nen tallithospheric man tle caused by the upwelling of asthenospheric man tle af ter the subducted slab was de lami nated.
Açıklama
Anahtar Kelimeler
Cooling Age, Enclave, Petrological Modelling, Shoshonites, Sub-volcanicphase
Kaynak
Geological Quarterly
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
66
Sayı
2
