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Miss Keziah Blake-Mizen

Postgraduate

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Current Research

I am working on my PhD with Dr. Ian Bailey (primary supervisor) and Prof. Stephen Hesselbo (secondary supervisor) at Camborne School of Mines, reconstructing variability in extent of the southern Greenland Ice Sheet (GrIS) and in the relative strength of the Western Boundary Undercurrent (WBUC) over the mid-Piacenzian warm period (mPWP, ~3.2 to 3 Ma) and the Plio-Pleistocene intensification of Northern Hemisphere glaciation (iNHG, ~2.7 Ma), as recorded by sediments cored on Eirik Drift spanning ~3.2 to 2.2 Ma. I have so far utilised the following techniques in my PhD research:

1. U-channel and discrete sampling of original core materials (at the IODP Core Repository, Bremen);

2. U-channel palaeomagnetics to generate a new core-site splice (using high-resolution magnetic susceptibility) and age model via generation of a relative palaeointensity estimate (NRM/ARM);

3. Quantification of ice-rafted debris (IRD) in discrete samples to monitor the presence of southern GrIS iceberg-calving margins (washing, disaggregating, sieving, optical microscopy);

4. Lead-isotope analysis of individual ice-rafted feldspars to track the provenance of IRD from different Greenland source regions through time (LA-ICP-MS)

5. QEMSCAN quantitative mineralogy to complement 4. by recognising distinct 'lithotypes' of IRD linked to onshore Greenland parent geologies (SEM, user-defined data processing using iDiscover software);

6. Environmental magnetics (magnetic susceptibility and magnetic grain-size) to ascertain relative changes in Greenland-sourced glaciofluvial silt, related to internal GrIS extent and strength of bottom-currents bathing our study site;

7. U-channel X-ray fluorescence (XRF) to measure relative changes in key elemental contents that reflect changing internal GrIS extents and surface ocean conditions;

8. Mastersizer physical grain-size measurements to study effects of grain-size on magnetic parameters and strength of bottom-current transport (includes removal of biogenics and organics).

 

Publications

Blake-Mizen, K., Hatfield, R.G., Stoner, J.S., Carlson, A.E., Xuan, C., Walczak, M., Lawrence, K.T., Channell, J.E.T., Bailey, I., 2019. Southern Greenland glaciation and Western Boundary Undercurrent evolution recorded on Eirik Drift during the late Pliocene intensification of Northern Hemisphere glaciation. Quaternary Science Reviews (manuscript accepted for publication)

 

Presentations

Exploring Research in Cornwall (ERIC) Conference 2015, Penryn Campus: (poster)

ERIC 2016, Penryn Campus: (poster)

European Geosciences Union (EGU) Conference 2016, Vienna:  (poster)

British Sedimentological Research Group (BSRG) AGM 2016, Cambridge: (poster)

ERIC 2017, Penryn Campus: (poster)

UK Paleoclimate Society (PACS) Conference 2017, Cardiff: (poster)

American Geosciences Union (AGU) Conference 2017, New Orleans: (poster)

 

Awards

Evan Llewelyn Davies Prize, July 2014 - Best performance in final-year Geology and Earth Sciences, Cardiff University

Best poster, March 2016 - Exploring Research in Cornwall, Penryn Campus

Gill Harwood Memorial Fund, March 2016 - British Sedimentological Research Group

 

Academic and Research Interests

Palaeoclimatology, palaeoceanography, palaeoenvironments, climate change, geochemistry.