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| Titel |
Changing morphology of accretionary lapilli further from the source (Zelve eruption, Cappadocia-Central Anatolia, Turkey) |
| VerfasserIn |
Orkun Ersoy, Erdal Şen, Gokhan Atici, Erkan Aydar, İlkan Tatar, H. Hamdi Çelik |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250054003
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| Zusammenfassung |
| Ash aggregates may convey information about the modes of eruption, transport and deposition. However, they were characterized on two-dimensional SEM micrographs or thin-sections to date. Here, the morphologies of accretionary lapilli from Zelve eruption in Cappadocia (Central Anatolia-Turkey) were obtained using X-ray computed micro-tomography. Volumetric core to rim ratios were calculated on three-dimensional models of aggregates which were reconstructed after tomography scans. Accretionary lapilli from Zelve eruption have decreasing core/rim ratios with increasing distances from the source. Samples collected from six locations with different distances from the source were analyzed. The proximal aggregates have core/rim ratios of 0.4-0.6, while the distal aggregates have ratios of 0.1-0.2. The decreasing core/ratios from proximal to distal locations indicate the depletion of coarse ash and/or the depletion of steam in the column. The column exhaust the coarse ash and/or the steam which is needed for accretion of coarse material during transportation to the distal zones. |
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