[Latinmag] Fwd: [gpmag-l] Hans Zijderveld passed away

Lun Mar 14 16:11:18 -03 2022

-------- Mensaje Original --------
Asunto: [gpmag-l] Hans Zijderveld passed away
Fecha: 2022-03-14 15:52
De: "'Langereis, C.G. (Cor)' via gpmag-l" <gpmag-l en ucsd.edu>
Destinatario: "gpmag-l en ucsd.edu" <gpmag-l en ucsd.edu>
Responder a: "Langereis, C.G. (Cor)" <C.G.Langereis en uu.nl>

Dear colleagues,

With sadness we let you know that Hans Zijderveld has passed away at
home on February 26th, at the age of 88 years. Hans was the first head
of the Paleomagnetic Laboratory Fort Hoofddijk (Utrecht University, The
Netherlands) established by professors M.G. Rutten (geology) and J.
Veldkamp (geophysics) in 1963. Fort Hoofddijk is eminently suited for
paleomagnetic measurements, and since 2021 belongs to a Unesco World
Heritage site (New Dutch Waterline). Hans started as an assistant to
professor Veldkamp, and headed Fort Hoofddijk until 1995 when he retired
early. He defended his PhD thesis on the Paleomagnetism of the Permian
Esterel rocks (southern France) in 1975, and was appointed as professor
in 1981. Some more details can be found in the Catalogus Professorum [1]
of Utrecht University, while the history of Fort Hoofddijk and Hans
Zijderveld is described in detail in a paper of Dekkers, Langereis and
Van der Voo (1997) [2]. Hans was elected AGU Fellow in 1993.

Before being focused in Fort Hoofddijk, paleomagnetism in the
Netherlands was done at the Royal Netherlands Meteorological Institute
(since 1953) and Hans was already part of it. In the early days of his
career he worked with Jo As to develop very sensitive astatic
magnetometers, but most importantly they developed the alternating field
(or alternating current) demagnetization method (As and Zijderveld,
1958). By selectively cleaning the weakest magnetic components in rocks
through stepwise progressive demagnetization a more trustworthy
determination of the strongest component was possible (now typically
called the Characteristic Remanent Magnetization or ChRM). Hans
Zijderveld became famous because of his article "A.C. Demagnetization of
rocks: Analysis of results" in 1967, a chapter in the book Methods in
Palaeomagnetism [3]. This seminal paper describes the so-called
Zijderveld diagram and has been cited widely. The Zijderveld diagram has
become the standard method to view and interpret the different
superimposed components during progressive stepwise demagnetization.

He was among the first, especially in his work with Rob van der Voo, to
recognize rotations of micro-plates, like the rotations of Sardinia
(Zijderveld et al., 1970, Nature), Iberia (PhD thesis R. van der Voo,
Tectonophysics, 1969) and the Italian peninsula (PhD thesis Peter
Scheepers) . Much more work especially in the Mediterranean would
follow, resulting in an overview of Paleomagnetism in the Mediterranean
Area (Vandenberg and Zijderveld, 1982).

An important topic of his research concerned the rock magnetic
properties of natural rocks and a considerable number of PhD theses
under his supervision were devoted to this subject (Peter Dankers, Bob
Hartstra, Mark Dekkers, Adrie van Velzen, Cor de Boer). Also in his own
thesis on the Esterel rocks he did many rock magnetic experiments to
determine the properties of the minerals carrying the NRM.

Hans Zijderveld in his earlier work devoted many studies to old rocks
(Permian, Triassic), notably red beds and lavas which were strong enough
to be measured on astatic magnetometers. Upon the acquisition of an RF
SQUID cryogenic magnetometer (the first in Europe) and later a DC SQUID
magnetometer (the first in the world), he decided to investigate much
younger rocks (Miocene and Pliocene sediments), initially in the context
of IGCP Project no. 1, 'Accuracy in Time'. This led to a renewed
interest in magnetostratigraphy both of Miocene (PhD theses Cor
Langereis, Wout Krijgsman) and Pliocene (Zijderveld et al., 1991, EPSL)
sediments in the Mediterranean. Most importantly, the collaboration with
the paleontology group in Utrecht, and notably with Frits Hilgen, led to
the development of the astronomically (calibrated) polarity time scale
(APTS) which has now become the standard in the geological time scale
for the Neogene and Paleogene periods (Hilgen et al., 2004; The geologic
time scale, 2020).

We remember Hans Zijderveld as an excellent supervisor, a careful and
critical observer and a researcher with integrity who has greatly
inspired us.

Cor Langereis, Mark Dekkers and Wout Krijgsman

-----------------------------------------------------------------------------------------------

Prof.dr. C.G. (Cor) Langereis [4] | Paleomagnetic Laboratory 'Fort
Hoofddijk' [5]

Department of Earth Sciences, Utrecht University

Budapestlaan 17, 3584 CD Utrecht, The Netherlands _(+31.30.253.1668)_

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[1] 
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