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| Titel |
Geothermal investigations in western Anatolia using equilibrium temperatures from shallow boreholes |
| VerfasserIn |
K. Erkan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 1 ; Nr. 6, no. 1 (2015-01-30), S.103-113 |
| Datensatznummer |
250115389
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| Publikation (Nr.) |
 copernicus.org/se-6-103-2015.pdf |
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| Zusammenfassung |
| Determination of the conductive heat flow in western Anatolia has broad
implications in many areas, including studies on the present-day extensional
tectonic activity and assessments of the geothermal resources in the region.
In this study, high-resolution equilibrium temperatures from 113 boreholes
with depths of ~100 m were analyzed for determination of the
conductive heat flow. Thermal conductivities were either determined by
measurements on outcrops or estimated using lithologic records. By a detailed
analysis of temperature–depth curves, a total of 55 sites were selected as
being useful for further conductive gradient/heat flow calculations, while
the remaining 58 sites were abandoned due to hydrological effects on
temperatures. Heat flow values with formal errors were calculated for
24 sites where rock thermal conductivity information is available. Due to the
shallow depths of the investigated boreholes and uncertainties in thermal
conductivity information, the results include a large accumulated error. A
preliminary heat flow map is generated using the results of this study and a
previous study in the southern Marmara region. Elevated heat flow values of
85–95 mW m-2 are observed in the coastal areas, including
peninsular parts of Çanakkale and Izmir. The central part of the Menderes
Massif also shows elevated heat flow values, the highest values
(>100 mW m-2) being in the northeastern part of the Gediz
Graben near the Kula volcanic center. Moderate heat flow values of
55–70 mW m-2 are observed in the eastern part of Çanakkale,
central part of Balıkesir, northwest of Manisa, and northeast end of Bursa
including Yalova. Some of the observed moderate values may be related to
unconstrained near surface phenomena due to shallow depth of
measurements. Towards the south of the study region, moderate heat flow
values are also observed in Muğla. Previously reported regional heat flow
values exceeding ~120 mW m-2 is not observed in the region.
The heat flow values reported in this study are comparable to the previously
reported values in the Aegean Sea, as the two regions form the back-arc
section of the Hellenic subduction zone. |
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