Archive for the ‘Volcanology’ category

Tephra deposits in the western Anatolia

January 27, 2012

Source: geology.sdsu.edu

Kazancı et al. from Ankara University published a paper in Global and Planetary Change about a tephra deposits in the Çardak area of Denizli. Its formation time is between 5380 ± 90 and 2395 ± 65 yrs cal BP according to radiocarbon dating of two palaeosol layers within the colluvium. These discoveries showed that very strong volcanic eruption occurred in the Aegean Sea apart from the Santorini explosion. Please refer to http://dx.doi.org/10.1016/j.gloplacha.2011.09.007

 

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40Ar/39Ar geochronology of volcanic rocks in the Western Turkey

July 26, 2010

A new paper by Karaoglu et al. appeared in the Lithos about the petrogenesis and 40Ar/39Ar geochronology of volcanic rocks in Usak – Gure Basin, in the Western Turkiye! They published a new chronology for the volcanic rocks exposed on the northern margin of the Menderes Massif. According to their results, the oldest volcanic units are about 17-16 million years old, which indicate the volcanism active during the latest Early Miocene. The youngest ages were found to be around 12 million years old. doi:10.1016/j.lithos.2010.07.001

Photograph by Steve Mattox

Loss of ice cap on Mount Agri (Ararat) – Updated

June 8, 2010

Mount Agri (also known as Ararat) is the highest mountain of Turkey with a peak elevation of 5137 m. Today, it bears the only ice cap of the country. However, it is melting continuously! A recent study published in the Journal of Asian Earth Science showed that the Mount Agri ice cap has been lost its surface area by 29% since 1976 based on multi-temporal Landsat and ASTER satellite imagery. According to the author, the retreat rate is about 7 hectare per year. In the paper, it argued that there is a strong evidence that this retreat is mostly because of the current warming trend revealed from the meteorological stations from the region. It is added that similar shrinking trends are also evident from other Turkish glaciers. For more information, please refer to http://dx.doi.org/10.1016/j.jseaes.2011.12.009

Photo by Behesnilian

63rd Turkish Geological Congress

April 7, 2010

The 63rd Geological Congress of Turkey, one of the Turkey‘s most important and long-term scientific conference, is held in Ankara this week (5-9 April 2010). This traditional conference is featuring numerous oral and poster presentations from many leading scholars and experts in and out of Turkey, on the latest geological research in a wide range of themes, including tectonics, paleomagnetism, sedimentology, mineralogy, volcanism, geochemistry, paleontology and many others. You can visit and see the current program and abstracts from http://www.jmo.org.tr/etkinlikler/kurultay/

Evidence of Holocene ashes from Central Anatolia in the deep-sea sediments of the Eastern Mediterranean

March 19, 2010

A new paper published by Hamann et al. about the first evidence of Holocene ash layers from the central Anatolia in the deep-sea sediment from the Eastern Mediterranean. The paper will appear in the Journal of Quaternary Research, with co-authers from Hacettepe University, Dr. Orkun Ersoy and Dr. Erkan Aydar. Radiometric, stratigraphic and sedimentological data shows that the tephra was deposited between 8970 and 8690 cal yr BP. They compared the tephra with proximal to medial-distal tephra deposits from well-known Mediterranean ash layers and ash fall deposits from the Central Anatolian volcanic field using electron probe microanalyses on volcanic glass shards and morphological analyses on ash particles. They found a correlation with the Early Holocene ‘Dikkartın’ dome eruption of the Erciyes Volcano, more than 600 km to the north. doi:10.1016/j.yqres.2009.12.004