People at Fort Hoofddijk

David Heslop
Dr. D. Heslop
Postdoc 1999-2002
Now at:
Universität Bremen
Fachbereich Geowissenschaften
Gebäude GEO I
Klagenfurterstrasse
28359 Bremen
Universitšt Bremen
Phone: +49 421 218-8920
E-mail:dheslop@geophysik.uni-bremen.de

Research
Publications



Research of David Heslop

Comparison of marine and contentinental 
time scales in the Quaternary 
Background

The interpretation of sedimentary records requires an understanding of the NRM acquisition mechanism, if we are to derive reliable records of the geomagnetic field.
For continental settings, the quality of the time scales is reasonable, but still distinctly less accurate than for the marine realm. The availability of oxygen isotope and other accurate (cyclostratigraphic) time frames enables to determine the geomagnetic record with great precision. 

Dave Heslop and Jack Hannam studying the cycles at Punta di Maiata (Sicily)

Project aims 
The aim of the project was two-fold. These two aims are closely linked, because the existence of an independent time frame is essential for a validation of NRM acquisition models.

1) Improvement of the ocean-loess correlation
The second aim will be firstly tackled by the analysis of existing loess-records. Data records are available in literature. Various (cross) spectral analyses will be used to improve the current correlation between loess and oxygen isotope records. It is anticipated that particular intervals will be (re)visited and resampled at a later stage in the project

2) Study of  NRM behaviour in marine and continental settings. 
Work on e.g. reversal excursions has shown that they are variably recorded in seemingly similar depositional settings, indicating a variable extent of diagenetic processes at each location. Hence, a methodological analysis is needed in addition to analysis of the NRM behaviour. 
 

publications Publications of David Heslop

2009
  • Köhler, C.M., Heslop, D., Dekkers, M.J., Krijgsman, W., van Hinsbergen, D.J.J. and von Dobeneck, T. (2008). Tracking provenance change during the late Miocene in the eastern Mediterranean using geochemical and environmental parameters, Geochemistry, Geophysics, Geosystems 9, Q12018, doi:10.1029/2008GC002127 
2004
  • Heslop, D., McIntosh, G. and Dekkers, M.J. (2004). Using time- and temperature-dependent Preisach models to investigate the limitations of modelling isothermal remanent magnetization acquisition curves with cumulative log Gaussian functions, Geophys. J. Int., 157, 55-63 
2003
  • Rodionov, V.P.,  Dekkers, M.J., Khramov, A.N., Gurevich, E.L., Krijgsman, W. , Duermeijer, C.E. and Heslop, D. (2003). Paleomagnetism and cyclostratigraphy of the Middle Ordovician Krivolutsky suite, Krivaya Luka section, southern Siberian platform: record of non-synchronous NRM-components or a non-axial geomagnetic  field ? Studia Geophysica Geodaetica, 47, 255-274. 
2002
  • Heslop D. and Dekkers M.J. (2002). Spectral analysis of unevenly spaced climatic time series using CLEAN: signal recovery and derivation of significance levels using a Monte Carlo simulation, Phys. Earth Planet. Inter., 130, 103-116. 
  • Heslop, D., Dekkers, M.J., Kruiver, P.P. and Van Oorschot, I.H.M. (2002). Analysis of isothermal remanent magnetisation acquisition curves using the expectation-maximisation algorithm. Geophys. J. Int., 148, 58-64.   [SOFTWARE]
  • Heslop, D., Dekkers, M.J. and Langereis, C.G. (2002). Timing and structure of the Mid-Pleistocene Transition: records from the loess deposits of Northern China. Palaeogeogr. Palaeoclimatol. Palaeoecol., 105, 133-143. 


2001

  • Kruiver, P.P., Dekkers, M.J., and Heslop, D. (2001). Quantification of magnetic coercivity components by the analysis of acquisition curves of isothermal remanent magnetisation, Earth Planet. Sci. Lett., 189, 269-276.  
2000
  • Heslop, D., Langereis, C.G. and Dekkers, M.J. (2000). A new astronomical time scale for the loess deposits of Northern China, Earth Planet. Sci. Lett., 184, 125-139.  
  • Partridge, T.C., Latham, A. and Heslop, D. (2000). Magnetostratigraphy of Makapansgat, Sterkfontein, Taung and Swartkrans. In: The Cenozoic of southern Africa, Oxford University Press, 126-129
  • Partridge, T.C., Shaw, J. and Heslop, D. (2000). Note on recent magnetostratigraphic analysis in Member 2 of the Sterkfontein formation. In: The Cenozoic of southern Africa, Oxford University Press, 129-130
1999
  • Heslop, D., Shaw, J., Bloemendal, J., Chen, F., Wang, E. and Parker, J. (1999). Sub-Millenial scale variations in East Asian monsoon systems recorded by dust deposits from North-Western Chinese Loess Plateau, Phys. Chem. Earth, A, 24(9), 785-792 
  • Partridge, T.C., Shaw, J., Heslop, D., Clarke, R.J. The new hominid skeleton from Sterkfontein, South Africa: age and preliminary assessment. Journal of Quaternary Science, 14(4),293-298