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DOI

10.19111/bmre.29965

Abstract

The terrigenous Neogene lithology in north of Karaburun peninsula is represented by Lower-
Middle Miocene rock units which are cut and bounded by NW-SE trending synthetic faults.
Dominant lacustrine sedimentation (Haseki and Hisarc›k formations) of Early-Middle Miocene
period which was separated by upper and lower regional unconformities, and the Early Miocene
mafic volcanism (Karaburun volcanites) were studied within the scope of Karaburun group.
Haseki formation which reflects Early Miocene sedimentation begins with fills of alluvial fan of
the Salman member and is basically formed by algal-biostromal Yeniliman limestone and
lacustrine deposits of Aktepe member. With synsedimentary emplacement of the 1st phase
Karaburun volcanites over Yeniliman limestone platform, the dominant sequence which is
micritic limestone intercalating with diatomite of the Aktepe member was deposited in
environmental conditions deepening towards shore-face. The effectiveness of NW trending
boundary faults which gave rise to 2nd phase of the Karaburun volcanism, shaping the western
edge of Foça depression towards the end of Early Miocene has not changed the dominant
depositional environment, and lacustrine sedimentation has continued with Hisarc›k formation.
Green and fine clastic shore-face sediments (Karaba¤lar› member) of the Hisarc›k formation
which deposited the latest between Early Miocene-Middle Miocene overlie Aktepe sequence
with submarine parallel unconformity. Karaburun volcanism which is represented by high
potassium andesitic products with calc alkaline character (pyroclastics and olivine- phyric
lavas) is synchronous with sedimentation of Haseki formation and has two phases. Pyroclastic
rocks which are in facies of base-surge, air-fall and ash-fall in lesser amount were emplaced
before lava eruptions. K/Ar aged, 1st phase products, which are 18.2±1.0 my according to K/Ar
dating, are in the position of stratigraphical reference level which separates Yeniliman
limestone from Aktepe member. Second phase products are emplaced in Aktepe sequence.

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