Petrolgy of the volcanic/subvolcanic members of the volcanosedimentary Maden Complex in Eastern Turkey
Yükleniyor...
Dosyalar
Tarih
2021
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
EGU General Assembly 2021
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Maden Complex exposed in Eastern Turkey, is a succession of volcano-sedimentary rocks and
tectonically overlain by Bitlis Metamorphics and Cretaceous ophiolitic rocks. The succession
includes shallow-water deposits and deep marine pelagic sediments intercalated with pillow lavas
ranging from a few centimeters to ten meters in diameter. The planktonic foraminiferal
assemblages from micritic limestones and zircon U-Pb ages from selected sedimentary rocks
indicate the age of Late Ypresian - Early Lutetian. Plagioclase and clinopyroxenes are the main
mineral phases, olivine rarely found as altered phenocrysts. Clinopyroxenes are augite and
diopside, and their compositions are ranging between Wo44-51, En27-43, Fe10-21. The anorthite
contents of plagioclases are between 32- 67 % in unaltered grains. The crystallization
temperatures and pressures obtained from clinopyroxene chemistry are ranging from 1126 to
1250oC and 3 to 8 Kbar, respectively. The majority of the volcanic/subvolcanic rocks are
subalkaline-tholeiitic basalts however; a few andesitic and rhyolitic derivatives are also present.
The whole – rock and Sr-Nd-Pb isotope compositions reveal that the basaltic rocks are originated
from E-MORB like asthenospheric mantle source without a subduction component.
Açıklama
Anahtar Kelimeler
Maden Complex, Eastern Turkey
Kaynak
EGU General Assembly 2021
