tc süleyman demirel üniversitesi fen bilimleri enstitüsü menderes

v
1996). In geothermal areas of Menderes Massif HCO3 - is the dominant ion so these
waters include CO2. High temperature and CO2 increase solubility of boron bearing
minerals.
Boron is the main component of tourmaline mineral. Tourmailine is quite durable,
very low solubility in the hot waters. Although tourmaline is durable acidic-neutral
pH values, it is not durable in alcali fluids (Frondel vd., 1947; Frondel ve Collette,
1957; Morgan ve London, 1989; London vd., 1996; Grew, 1996; London ve Morgan,
1996). Geothermal waters of the study area, probability of boron derived tourmalines
is low.
The highest He value is in the Kula volcanism (2.8 RA) and Denizli (3.7 RA) in west
Anatolia (Güleç vd., 2002). Mantle helium with Neogene volcanism transports to the
surface along the active fault zones formed extensional tectonism. Denizli has recent
seismic activity. High R/RA ratio and seismic activity can relate with recent
magmatism in the ground. So boron can derive from magma but not completely.
Because there are many differences hydrogeochemical, isotope geochemical features
and boron contents in the geothermal waters of Menderes Massif. Germencik and
Salavatlı geothermal waters have high value in respect of Bayındır geothermal waters
(50.70-74.60 mg/l). Geothermal waters circulated in different lithologies and cold
groundwater mixing result from different boron contents.
KEY WORDS: Menderes Massif, continental rift zone, geothermal waters, waterrock
interaction, boron.