Hidden calderas evidenced by multisource geophysical data; example of Cappadocian Calderas, Central Anatolia

Froger, Jean‐Luc; Lénat, Jean‐François; Chorowicz, J.; Pennec, Jean–Luc Le; Bourdier, Jean-Louis; Köse, Onur; Zimitoğlu, Okan; Gündoğdu, Niyazi; Gourgaud, Alain

doi:10.1016/s0377-0273(98)00052-3

Cited by 57 publications

(36 citation statements)

References 40 publications

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“…A number of studies (INNOCENTI et al, 1975;PASQUARE et al, 1988;BIGAZZI et al, 1993;LE PENNEC et al, 1994;NOTSU et al, 1995: AYDAR andGOUR-GAUD, 1998;FROGER et al, 1998;KURKCUOGLU et al, 1998;TOPRAK, 1998;SEN et al, 2003SEN et al, , 2004 have been carried out in the Central Anatolian Volcanic Province (CAVP). The CAVP is a complex system of volcano-tectonic depressions created during the MidLate Miocene times.…”

Section: Geological Settingsmentioning

confidence: 99%

Curie-point Depth from Spectral Analysis of Magnetic Data in Erciyes Stratovolcano (Central TURKEY)

Maden

2009

Pure Appl. Geophys.

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Curie-point depth and heat flow values of the Erciyes region are determined to identify the thermal regime of the Central Anatolia by applying the spectral analysis method to the magnetic anomaly data. To compute the spectrum of the data, the magnetic anomaly of the region is transformed into 2-D Fourier domain to attain the average Curie depth. This method is useful in determining the top boundary of magnetic anomaly sources and reveals the Curie depth as 13.7 km in the study area. The obtained results imply a high thermal gradient (42.3°C km -1 ) and corresponding heat flow values (88.8 mWm -2 ) in the research area. Using the temperature value measured at borehole drilled by the General Directorate of Mineral Research and Exploration of Turkey (MTA), the values for the thermal gradient and heat flow value were computed as 50.7°C km -1 , 106.5 mWm -2 . From the heat flow value, the Curie-point depth was determined as 11.4 km in this region. It is concluded from the obtained values that the region has very high geothermal potential caused by partial melting of the lower crust.

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Section: Geological Settingsmentioning

confidence: 99%

Curie-point Depth from Spectral Analysis of Magnetic Data in Erciyes Stratovolcano (Central TURKEY)

Maden

2009

Pure Appl. Geophys.

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“…TOPRAK (1998) investigated surface features using geological methods and ILKISIK et al (1997) studied the geothermal field potential of the Ihlara Valley, east of Cappadocia, using geoelectromagnetic and geothermic methods from which they suggested a modest geothermal potential and the presence of some undiscovered fields. FROGER et al (1998) explored the hidden calderas by using multi-source geophysical data. Available palaeomagnetic data for central Anatolia were summarized by PIPER et al (2002) who suggested anticlockwise rotation of the Cappadocia volcanic complex and clockwise rotation in the western extremity of the Anatolian collage.…”

Section: Introductionmentioning

confidence: 99%

Interpretation of the Gravity and Magnetic Anomalies of the Cappadocia Region, Central Turkey

Büyüksaraç

Jordanova

Ateş

et al. 2005

Pure appl. geophys.

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The Cappadocia region, located in Central Turkey, is characterized by widespread lava flows and volcanoclastic deposits dating from Miocene to Quaternary. Gravity and aeromagnetic anomalies of the region appear to present similar high and low amplitude regions, although the aeromagnetic anomalies exhibit a rather complex pattern which is thought to be caused by remanent magnetization. The low-pass filtered aeromagnetic map shows a deep-seated magnetic anomaly which may be linked to the widespread volcanic activity at the surface. The pseudogravity transformation of the upward continued anomaly has been constructed. The pseudogravity anomaly demonstrates some form of clockwise rotation. This anomaly was modelled by means of a three-dimensional method. The top and bottom of the body are at 6.3km and 11km (including the flight height) from the ground surface, respectively. This deep body is ellipsoidal and extends along an E-W direction, which is in line with the regional stress direction deduced from GPS measurements. A new mobilistic dynamo-tectonic system appears to explain the body's E-W elongation. The modelled body may be the source for the inferred geothermal energy of the region. Magnetic measurements were carried out on oriented rock samples collected from outcrops of ignimbrites and basalts, providing directions and intensities of remanent magnetization, susceptibilities and Koeningsberger (Q) ratios. Standard deviations of remanent directions of the Natural Remanent Magnetization (NRM) display a wide scatter implying unreliability of the surface data. Reduction to pole (RTP) transformation of magnetic anomalies was successful with the induced magnetization angle despite the complex pattern of magnetic anomalies.

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“…On the other hand, Schumacher and Mues-Schumacher (1996) suggested, based on an isopach map of the Kzlkaya plinian fall-out layer and on lateral variations of welding in the Kzlkaya ignimbrite (Figure 3b), that the source area is situated somewhere between Yarhisar and Edikli in the Misli plain. However, on the basis of gravity data, remote sensing data and digital elevation models Froger et al (1998) have identified two major caldera complexes and supported the proposed source areas of Le Pennec et al (1994): (1) Nevs¸ehir-Acgöl caldera complex as the source of Kavak and Zelve ignimbrites and (2) Derinkuyu caldera complex, located between the Erdas Dag massif and the Ç iftlik depression, as the source region for the Sarmaden, Cemilköy, Gördeles and Kzlkaya ignimbrites. The Derinkuyu caldera complex is also the possible source region for the upper ignimbrite in the study area.…”

Section: Introductionmentioning

confidence: 90%

Geochemistry, mineralogy and petrogenesis of the northeast Niğde volcanics, central Anatolia, Turkey

Yurtmen

Rowbotham

2002

Geological Journal

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The volcanics exposed in the northeast Nigde area are characterized by pumiceous pyroclastic rocks present as ash flows and fall deposits and by compositions ranging from dacite to rhyolite. Xenoliths found in the volcanics are basaltic andesite, andesite and dacite in composition. These rocks exhibit linear chemical variations between end-member compositions and a continuity of trace element behaviour exists through the basaltic andesite-andesite-dacite-rhyolite compositional range. This is consistent with the fractionation of ferromagnesian minerals and plagioclase from a basaltic andesite or andesite parent. These rocks are peraluminous and show typical high-K calc-alkaline differentiation trends with total iron content decreasing progressively with increasing silica content. Bulk rock and mineral compositional trends and petrographic data suggest that crustal material was added to the magmas by subducted oceanic crust and is a likely contaminant of the source zone of the Nigde magmas.The chemical variations in these volcanics indicate that crystal liquid fractionation has been a dominant process in controlling the chemistry of the northeast Nigde volcanics. It is also clear, from the petrographic and chemical features, that magma mixing with disequilibrium played a significant role in the evolution of the Nigde volcanic rocks. This is shown by normal and reverse zoning in plagioclase and resorption of most of the observed minerals. The xenoliths found in the Nigde volcanics represent the deeper part of the magma reservoir which equilibrated at the higher pressures.

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Hidden calderas evidenced by multisource geophysical data; example of Cappadocian Calderas, Central Anatolia

Cited by 57 publications

References 40 publications

Curie-point Depth from Spectral Analysis of Magnetic Data in Erciyes Stratovolcano (Central TURKEY)

Curie-point Depth from Spectral Analysis of Magnetic Data in Erciyes Stratovolcano (Central TURKEY)

Interpretation of the Gravity and Magnetic Anomalies of the Cappadocia Region, Central Turkey

Geochemistry, mineralogy and petrogenesis of the northeast Niğde volcanics, central Anatolia, Turkey

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