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Tina Klein

Doctoral Students

Group: 

Isotope Geochemistry

Phone: 

+49 421 218-65943

Email:

Room: 

Marum I, 1260

Tina Klein

PhD project

Tracing ocean pH/acidification at the Early Jurassic (Pliensbachian-Toarcian) and Permo-Triassic extinction events

My research project focuses on the reconstruction of ancient ocean pH during the Early Jurassic (Pliensbachian-Toarcian, approx. 183 million years ago) and Permian-Triassic (approx. 250 million years ago) extinction events. Ocean acidification is a proposed driver for both extinction events triggered by the release of high amounts of carbon dioxide, which were probably due to the occurrence of major flood basalts. To test this hypothesis I am going to construct high-resolution boron isotope profiles on marine carbonates and calcifying marine species to trace changes in ocean pH and their influence on marine organisms. Sampling of micritic carbonates from shallow water environments for the Early Jurassic extinction event are carried out in the Lusitanian Basin (Portugal) and in the Celtiberian Chains (Spain). For the Permo-Triassic boundary the Julfa and Abadeh region in northwestern and central Iran are envisaged, respectively.

This PhD project is part of the interdisciplinary research group TERSANE

Field Trip Lusitanian Basin (Portugal) - November 2016

Sampling of micritic carbonates of Pliensbachian age near Fonte Coberta (Portugal)
Sampling of micritic carbonates of Pliensbachian age near Fonte Coberta (Portugal)

Sampling of carbonates of Toarcian age near Fonte Coberta
Sampling of carbonates of Toarcian age near Fonte Coberta

Midday sun at the geological site near Fonte Coberta
Midday sun at the geological site near Fonte Coberta

Field Trip Keltiberian Chains (Spain) - September 2017

Toarcian sediments at the geological site 'Barranco de la Cañada'
Toarcian limestone/ marl alternation at the geological site 'Barranco de la Cañada'
Pliensbachian/Toarcian boundary (ferrogenous (brownish) surface)
Pliensbachian/Toarcian boundary (ferrous brownish surface) at 'Barranco de la Cañada'
Pliensbachian limestones
Pliensbachian limestones at 'Barranco de la Cañada'

GLOMAR

Thesis committee Affiliation
Prof. Dr. Simone Kasemann MARUM, University of Bremen
Prof. Dr. Rachel Wood University of Edinburgh, UK
Dr. Friedrich Lucassen MARUM, University of Bremen
Anette Meixner MARUM, University of Bremen

 

Research interests

  • stable isotope geochemistry (B, O, C)
  • mass spectrometry
  • paleoceanography
  • climate research

Curriculum vitae

2016 -   recent

PhD student at MARUM, University of Bremen

Thesis title:
'Tracing ocean pH/acidification at the Early Jurassic (Pliensbachian-Toarcian) and Permo-Triassic extinction events'

 

2013 - 2016 MSc Geosciences, Johann Wolfgang Goethe-University Frankfurt/ Main

Thesis title:
'Reconstruction of deep ocean circulation across the Rio Grande Rise during the opening of the South Atlantic Ocean during Maastrichtian - Early Paleocene times'

Supervisors: Prof. Dr. Silke Voigt, Dr. Sietske J. Batenburg
2009 - 2013
BSc Geosciences, Johann Wolfgang Goethe-University Frankfurt/ Main

Thesis title:
'Pliocene high-resolution benthic isotope stratigraphy and bottom water paleoceanography of North Atlantic Ocean Site 552A'

Supervisors: Prof. Dr. Jens O. Herrle, Dr. Cyrus Karas

 

Conference publications

Klein, T., Anette Meixner, Kasemann, S., Duarte, L. V., Wood, R.A. (August 2018). "New insights into environmental conditions for the Early Jurassic Toarcian Oceanic Anoxic Event from boron and lithium isotopes" At Goldschmidt in Boston/USA and IGCP 655 - TOAE in Coimbra/Portugal

S. J. Batenburg, S. Voigt, O. Friedrich, A. Osborne, T. Klein, C. Neu, M. Frank (March 2016). "Latest Cretaceous—early Paleogene Atlantic deep ocean circulation and connectivity" At: IODP/ICDP Colloquium in Heidelberg, pp. 29-30.