TY - JOUR
T1 - The emplacement history of granitic intrusions into the upper crust
T2 - Forceful to passive emplacement of the early Miocene Solarya Pluton (NW Turkey) as a case study
AU - Ünal, Alp
AU - Altunkaynak, Şafak
AU - Kamacı, Ömer
AU - Dunkl, Istvan
AU - Benowitz, Jeffrey A.
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/10/1
Y1 - 2019/10/1
N2 - Post-collisional magmatism in western Anatolia produced several granitic bodies represented by shallow level intrusions. In this study, we present field, geochronology and geothermo-barometry results of the Solarya Pluton (SP, NW Turkey) in order to better understand its emplacement into the different levels of the crust. The SP consists of three main plutonic members showing different textural properties; the northern part of the plutonic body is represented by K-feldspar megacrystalline granodiorite (KFMG) with distinct porphyritic texture and southern part is made up of microgranite-granodiorite (MGG) displaying microgranular texture whereas haplogranite, which displays graphic/granophyric textures, is represented by a thin aureole between the SP and basement rocks. Field relations, petrography and geothermo-barometry studies combined with 40Ar/39Ar and U-Pb zircon dating results suggest that different members of the SP were emplaced into different levels of crust with different mechanisms. The KFMG (40Ar/39Ar − 23.2 Ma, U-Pb – 21.8 Ma) began its emplacement forcefully in the relatively deeper levels in the crust (av. 1.65 kbar; av. 797 °C; 6.1 km depth). After this stage, MGG (40Ar/39Ar – 22.6 Ma, U-Pb – 21.2 Ma) was passively emplaced into the shallow levels (av. 0.69 kbar; av. 745 °C; 2.4 km depth) via cauldron subsidence and in the latter stages the sheet intrusive rocks (haplogranite 40Ar/39Ar – 21.6 Ma and hypabyssal association) were emplaced into the ring faults at 1.5 km depth. Forceful to passive emplacement of the SP into the upper crust occurred under Aegean extensional tectonics. Our study contributes to examination of the granite ascent and emplacement within other extensional provinces worldwide.
AB - Post-collisional magmatism in western Anatolia produced several granitic bodies represented by shallow level intrusions. In this study, we present field, geochronology and geothermo-barometry results of the Solarya Pluton (SP, NW Turkey) in order to better understand its emplacement into the different levels of the crust. The SP consists of three main plutonic members showing different textural properties; the northern part of the plutonic body is represented by K-feldspar megacrystalline granodiorite (KFMG) with distinct porphyritic texture and southern part is made up of microgranite-granodiorite (MGG) displaying microgranular texture whereas haplogranite, which displays graphic/granophyric textures, is represented by a thin aureole between the SP and basement rocks. Field relations, petrography and geothermo-barometry studies combined with 40Ar/39Ar and U-Pb zircon dating results suggest that different members of the SP were emplaced into different levels of crust with different mechanisms. The KFMG (40Ar/39Ar − 23.2 Ma, U-Pb – 21.8 Ma) began its emplacement forcefully in the relatively deeper levels in the crust (av. 1.65 kbar; av. 797 °C; 6.1 km depth). After this stage, MGG (40Ar/39Ar – 22.6 Ma, U-Pb – 21.2 Ma) was passively emplaced into the shallow levels (av. 0.69 kbar; av. 745 °C; 2.4 km depth) via cauldron subsidence and in the latter stages the sheet intrusive rocks (haplogranite 40Ar/39Ar – 21.6 Ma and hypabyssal association) were emplaced into the ring faults at 1.5 km depth. Forceful to passive emplacement of the SP into the upper crust occurred under Aegean extensional tectonics. Our study contributes to examination of the granite ascent and emplacement within other extensional provinces worldwide.
KW - Extension
KW - Geothermo-barometry
KW - NW Anatolia
KW - Pluton emplacement
KW - Shallow intrusion
UR - http://www.scopus.com/inward/record.url?scp=85071125639&partnerID=8YFLogxK
U2 - 10.1016/j.jseaes.2019.103979
DO - 10.1016/j.jseaes.2019.103979
M3 - Article
AN - SCOPUS:85071125639
SN - 1367-9120
VL - 183
JO - Journal of Asian Earth Sciences
JF - Journal of Asian Earth Sciences
M1 - 103979
ER -