Water Chemistry and Isotope Studies In Aksaray Geothermal Fields (Acıgöl-Ziga-Şahinkalesi), Central Anatolia, Turkey

Musa BURÇAK

Makale detayları

Water Chemistry and Isotope Studies In Aksaray Geothermal Fields (Acıgöl-Ziga-Şahinkalesi), Central Anatolia, Turkey

Yazarlar:

Musa BURÇAK

Yayıncı:

Maden Tetkik Arama Genel Müdürlüğü

Ana Başlıklar:

Uygulamalı fizik

Dergi:

Bulletin of the Mineral Research and Exploration 2009 Vol.138 Issue 138, pp.45-68

Belge Tipi:

Makale

Yayın Tarihi:

6/2009

Belge Dili:

İngilizce

Document ID (Org No.):

2000520712

Sıklık:

Üç Yıllık

pISSN:

0026-4563

Özet:

 


The basement in the study area is comprised of gneisses of Paleozoic Tamadaq formation, marbles of Bozcaldağ formation and Upper Cretaceous  Baranadağ granitoid intrusion into the above-mentioned rocks. These units have unconformable relations with Lower Eocene Cayraz formation and sedimentary rocks of Upper Eocene - Lower Miocene Mezgit group. All these units are unconformably overlain by Middle Miocene- Quaternary tuffs, ignimbrites with sedimentary intercalations and rocks of Cappadocia Volcanic belt represented by tuffites with sedimentary interbedding, basaltic lavas, volcanic ashes, pumice, dacitic-rhyodacitic lava domes. The study area contains Ziga and AClgöl (Narkoy) thermal fields which have a temperature of 44-65 °C from wells and hot springs. Hydrothermal alterations surrounding the geothermal area; young volcanic and tectonic activity, and the hot springs are the surface manifestation of the geothermal possibilities in the area. Reservoir rocks of the geothermal system are Paleozoic gneiss, schist and marbles. Cap rocks of the system in the study area are hydrothermally altered tuffs and ignimbrites. According  to the classification  of IAH (International  Association  of Hydrogeologists)  standards  while; all of the cold waters  are Ca-Mg-HCO3 and CaHCO3   type in the region, the hot waters of the  Acigöl field are classified  as Ca-Na-HCO3-CI   type and mineralized hot waters, the hot waters in Ziga field are classified  as Na-CI-HCO3   type and B bearing mineralized hot waters,  the hot water of Şahinkalesi  field  (from well) is classified  as non-mineralized  thermal  water. Deuterium  results suggest  1500-1600  m recharging elevation for hot springs and water chemistry and isotope studies imply that  recharging  area may extend  up to the foothills of the Hasandaq.  Tritium analyses have revealed that the hot water was recharged from  precipitation  before nuclear tests experienced before 1952 (I.e. older than 60 years). According to SiO2  - enthalpy mixing model, 155°C  reservoir temperature and 65% cold water mix were calculated for AClgöl field. On the basis of chalcedony geothermometer, 114-160°C, 69-93 °C and 135°C and on the basis of quartz geothermometer  140-181 °C, 99-121 °C, and 159°C  reservoir temperatures were calculated for Acıgöl, Ziga and Şahinkalesi geothermal fields, respectively.

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The basement in the study area is comprised of gneisses of Paleozoic Tamadaq formation, marbles of Bozcaldağ formation and Upper Cretaceous  Baranadağ granitoid intrusion into the above-mentioned rocks. These units have unconformable relations with Lower Eocene Cayraz formation and sedimentary rocks of Upper Eocene - Lower Miocene Mezgit group. All these units are unconformably overlain by Middle Miocene- Quaternary tuffs, ignimbrites with sedimentary intercalations and rocks of Cappadocia Volcanic belt represented by tuffites with sedimentary interbedding, basaltic lavas, volcanic ashes, pumice, dacitic-rhyodacitic lava domes. The study area contains Ziga and AClgöl (Narkoy) thermal fields which have a temperature of 44-65 °C from wells and hot springs. Hydrothermal alterations surrounding the geothermal area; young volcanic and tectonic activity, and the hot springs are the surface manifestation of the geothermal possibilities in the area. Reservoir rocks of the geothermal system are Paleozoic gneiss, schist and marbles. Cap rocks of the system in the study area are hydrothermally altered tuffs and ignimbrites. According  to the classification  of IAH (International  Association  of Hydrogeologists)  standards  while; all of the cold waters  are Ca-Mg-HCO3 and CaHCO3   type in the region, the hot waters of the  Acigöl field are classified  as Ca-Na-HCO3-CI   type and mineralized hot waters, the hot waters in Ziga field are classified  as Na-CI-HCO3   type and B bearing mineralized hot waters,  the hot water of Şahinkalesi  field  (from well) is classified  as non-mineralized  thermal  water. Deuterium  results suggest  1500-1600  m recharging elevation for hot springs and water chemistry and isotope studies imply that  recharging  area may extend  up to the foothills of the Hasandaq.  Tritium analyses have revealed that the hot water was recharged from  precipitation  before nuclear tests experienced before 1952 (I.e. older than 60 years). According to SiO2  - enthalpy mixing model, 155°C  reservoir temperature and 65% cold water mix were calculated for AClgöl field. On the basis of chalcedony geothermometer, 114-160°C, 69-93 °C and 135°C and on the basis of quartz geothermometer  140-181 °C, 99-121 °C, and 159°C  reservoir temperatures were calculated for Acıgöl, Ziga and Şahinkalesi geothermal fields, respectively.



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Makale detayları

Water Chemistry and Isotope Studies In Aksaray Geothermal Fields (Acıgöl-Ziga-Şahinkalesi), Central Anatolia, Turkey

Yazarlar: Musa BURÇAK

Yayıncı: Maden Tetkik Arama Genel Müdürlüğü

Ana Başlıklar: Uygulamalı fizik

Dergi: Bulletin of the Mineral Research and Exploration 2009 Vol.138 Issue 138, pp.45-68

Belge Tipi: Makale

Yayın Tarihi: 6/2009

Belge Dili: İngilizce

Document ID (Org No.): 2000520712

Sıklık: Üç Yıllık

pISSN: 0026-4563

Sayı

Yazarlar:

Musa BURÇAK

Yayıncı:

Maden Tetkik Arama Genel Müdürlüğü

Ana Başlıklar:

Uygulamalı fizik

Dergi:

Bulletin of the Mineral Research and Exploration 2009 Vol.138 Issue 138, pp.45-68

Belge Tipi:

Makale

Yayın Tarihi:

6/2009

Belge Dili:

İngilizce

Document ID (Org No.):

2000520712

Sıklık:

Üç Yıllık

pISSN:

0026-4563