Projekt

When did Early Modern Humans first arrive in Central Eurasia. Using solid-state dosimetry to unravel the past

Udbyder

Vejleder

Sted

København og omegn

Aim:

The main purpose of this project is to test the contentious hypothesis that Anatomically Modern Humans appeared on the central East European Plain at Kostenki (Russia) well before 41 ka ago. To test this hypothesis we will establish a reliable chronology based on optically stimulated luminescence (OSL) using both quartz multi-grain and single-grain signals.

Background:

Luminescence dating is an absolute chronometer that is almost universally applicable to the sedimentary record of the late Quaternary. Any sediment that has been exposed to daylight during transport is potentially datable using OSL. This has evolved to become one of the major chronometric tools used in Modern Human evolution and migration studies; in many cases it is the only available method.

In OSL dating the amount of energy absorbed (dose) during burial by a mineral (usually quartz or feldspar) since it was last exposed to daylight is used as a chronometer. This energy is absorbed from environmental ionising radiation, and some of it is stored by electrons held in the band gap in traps arising from defects in the crystal lattice. in the laboratory, an artificial light source is used to stimulate some of the trapped electrons. As electrons are released, light (luminescence) may be emitted during the recombination process; this luminescence can be calibrated in terms of total absorbed energy (dose). The time since the traps in the material were last emptied is then calculated by dividing the dose by the dose rate, i.e. a luminescence age refers to the time since last exposure to daylight.

Project description:

The student will undertake all the necessary quartz OSL measurements and determine the environmental dose rate using high resolution gamma spectrometry to establish a reliable chronology for Kostenki. This project will contribute significantly to our understanding of when modern humans arrived in Eurasia and stimulate the search for older AMH deposits. The project will also contribute one of the few combined tests of single-grain and multi-grain OSL methods against independent age control.

 

Project outline:

1)      Chemical preparation of sediment samples (both quartz and feldspar) for luminescence dating

2)      Establishment of appropriate OSL measurement protocols

3)      Dose rate measurements using high-resolution gamma spectrometry

4)      Establishment of a reliable chronology for Kostenki

I samarbejde med

Andrew Murray, Aarhus University

Forudsætninger

Curious mind, not afraid of the dark, interested in experimental cross-disciplinary work, meticulous, willing to contribute positively to an international and dynamic scientific environment

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Tags
Kontakt

Virksomhed/organisation

DTU Nutech

Navn

Kristina Jørkov Thomsen

Stilling

Seniorforsker

Mail

krth@dtu.dk

Vejleder-info

Kandidatuddannelsen i Geofysik og Rumteknologi

Vejleder

Kristina Jørkov Thomsen

ECTS-point

30

Type

Kandidatspeciale

Kandidatuddannelsen i Fysik og Nanoteknologi

Vejleder

Kristina Jørkov Thomsen

ECTS-point

30

Type

Kandidatspeciale

OM DTU

DTU er et teknisk eliteuniversitet med international rækkevidde og standard. Vores mission er at udvikle og nyttiggøre naturvidenskab og teknisk videnskab til gavn for samfundet. 10.000 studerende uddanner sig her til fremtiden, og 5.700 medarbejdere har hver dag fokus på uddannelse, forskning, myndighedsrådgivning og innovation, som bidrager til øget vækst og velfærd.

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Anker Engelunds Vej 1
Bygning 101A
2800 Kgs. Lyngby


45 25 25 25

dtu@dtu.dk

CVR-nr. 30 06 09 46

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