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Intersecting Fracture Geometries in Control of Geothermal Spring Occurrences in Circumferences of the Madra Mountain, Aegean Region of Turkey

Turan, A. and Saner, S. and Artun, Emre (2016):
Intersecting Fracture Geometries in Control of Geothermal Spring Occurrences in Circumferences of the Madra Mountain, Aegean Region of Turkey.
In: Geothermal Resources Council Annual Meeting-2016, Sacramento, California, USA, 40, [Conference or Workshop Item]

Abstract

Abundant geothermal springs occur in the Aegean Region of Turkey. These are all associated with two important phenomena: 1. Rough topography causing hydrostatic pressure; and 2. Intersecting fracture planes which provide pathways for water to seep down and flow back to the surface upon getting heated. Deep seated steeply dipping fractures which provide inflow in metamorphic or plutonic basement rocks are intersected by young normal faults that are pathways for outflow. Young faults are mainly those bounding horst and graben structures in the region and host hot springs along them. Strike and dip angles of intake and outlet fracture systems control the depth of intersection line where vadose water flow is diverted upward. Temperature is related to intersection depth. Strike direction relationships between the fractures determine if cold water will mix with hot water or not. Once conditions permit hot water to flow to the surface, a convection circulation system forms and alters the regional geothermal gradient by heating along the flow pathway. Geothermal spring temperature is related with regional geothermal gradient but while flowing up cooling does not follow the geothermal gradient because of heating by circulation system developed over the years.

Item Type: Conference or Workshop Item
Erschienen: 2016
Creators: Turan, A. and Saner, S. and Artun, Emre
Title: Intersecting Fracture Geometries in Control of Geothermal Spring Occurrences in Circumferences of the Madra Mountain, Aegean Region of Turkey
Language: English
Abstract:

Abundant geothermal springs occur in the Aegean Region of Turkey. These are all associated with two important phenomena: 1. Rough topography causing hydrostatic pressure; and 2. Intersecting fracture planes which provide pathways for water to seep down and flow back to the surface upon getting heated. Deep seated steeply dipping fractures which provide inflow in metamorphic or plutonic basement rocks are intersected by young normal faults that are pathways for outflow. Young faults are mainly those bounding horst and graben structures in the region and host hot springs along them. Strike and dip angles of intake and outlet fracture systems control the depth of intersection line where vadose water flow is diverted upward. Temperature is related to intersection depth. Strike direction relationships between the fractures determine if cold water will mix with hot water or not. Once conditions permit hot water to flow to the surface, a convection circulation system forms and alters the regional geothermal gradient by heating along the flow pathway. Geothermal spring temperature is related with regional geothermal gradient but while flowing up cooling does not follow the geothermal gradient because of heating by circulation system developed over the years.

Volume: 40
Uncontrolled Keywords: geothermal, geology, geomorhology, fracture geometries, geothermal gradient, Madra Mountain, Turkey
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Earth Science > Geothermal Science and Technology
Event Title: Geothermal Resources Council Annual Meeting-2016
Event Location: Sacramento, California, USA
Date Deposited: 05 Feb 2019 06:25
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