The purpose of this study is to understand the geological, petrographical, mineralogical and
geochemical characteristics of analcime-bearing tuffs in the Biga Peninsula and to determine
formation process of these tuffs.
The study area lies between Ayvacik and Kü / ç / ü / kkuyu. The rock units are pre-Eocene
basement rocks, Miocene Behram Volcanics (Arikli Tuff, andesite, andesitic agglomerate),
Pliocene volcanics, Miocene lacustrine sediments (Kü / ç / ü / kkuyu Formation) and Quaternary
alluvium. Analcimes which are found in Arikli Tuff are the main objective of this study.
Detailed petrographical, mineralogical and geochemical studies were caried out on the Arikli
Tuff samples by using petrographical microscope, X-ray diffractometry, scanning electron
microscopy, diffrential thermal analyses inductively coupled plasma & / #8211 / mass spectrometry and
optical emission spectrometry.
Fine-grained and coarse-grained analcime crystals in Arikli Tuff were determined by their
colorless, isotropic, trapezohedral and low relief. In addition to petrographic study, SEM and
XRD methods also confirmed the presence of analcime.
Two modes of occurrences were determined by the petrographical and mineralogical studies / coarse-grained euhedral or anhedral crystals in cavities and pumice fragments and single
crystals or clusters of fine-grained analcimes embedded in the matrix.
It was stated that there are two types of formation of analcime / alteration of volcanic glass and
precipitation from alkaline solution based on petrographical and SEM studies. Geochemical
methods, moreover, support the formation types.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/3/12609940/index.pdf |
| Date | 01 March 2008 |
| Creators | Ozen, Sevgi |
| Contributors | Goncuoglu, Cemal M. |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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