GEO3BCN&UB Seminars

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Category
Seminars & talks
Date
2024-04-10 12:00

Cosmogenic surface exposure dating applications from Turkey: moraines, lava flows, alluvial fans, fault surfaces, rock avalanches, fluvial terraces, and incision rates

  • Attila Çiner, Eurasia Institute of Earth Sciences, Istanbul Technical University, Maslak, Istanbul, Turkey
  • April 10, 2024 | 12:00 h CET
  • Online and at GEO3BCN-CSIC's conference room.
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Abstract

Increasing use of cosmogenic surface exposure dating methods, based on the in situ accumulation of rare nuclides (10Be, 26Al, and 36Cl) in rocks exposed to cosmic radiation, enables us to better understand the duration and extent of geomorphic processes. I report our work from Turkey, where we dated various Quaternary surfaces and deposits. Our most essential applications relate to boulders collected from moraines, as they can reconstruct glacier fluctuations and paleoclimates. We have dated numerous mountains, mainly within the Taurus Mountain Range along the Mediterranean coastline, where moraines were deposited primarily during the Last Glacial Maximum (LGM; ~20 ka), and to a lesser extent during pre-LGM (~50 ka), Younger Dryas (~12 ka) and Early Holocene (~10 ka). We also used this method to determine the timing of the abandonment/incision of alluvial fan lobes that were later cut and displaced by a major left-lateral strike-slip fault. The timing of surface breaking and slip and extension rates were also calculated, permitting the evaluation of these structures' role in the regional tectonic framework. In another study, abandonment ages of river terraces based on burial and isochron-burial dating with cosmogenic 10Be and 26Al yielded the long-term incision rate of the Kızılırmak River (51 m/Ma since 1.9 Ma) as a proxy for the rock uplift, and the long-term denudation rate of the Central Anatolia Plateau. We also used this method to date rock avalanches (~5  ka) in the Taurus Mountains. Last but not least, using cosmogenic nuclides, we could date basaltic lava flows (~5 to 10 ka) and calculate erosion rates of peculiar landforms locally known as “fairy chimneys” in Cappadocia.

 

 
 

List of Dates (Page event details)

  • 2024-04-10 12:00

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