[Geoinfo] Ciclo de Conferencias del IGEBA

[Patricia L. Ciccioli]

*Estimados*

Invitamos a todos los miembros del Departamento de Ciencias Geológicas y
colegas de otras Instituciones a participar de una nueva charla del Ciclo de
 Conferencias que organiza el Instituto IGEBA y el Departamento de Cs.
Geológicas. Recordamos que las mismas tienen por objetivo actualizar,
difundir, discutir y/o comunicar la actividad científica que desarrollan
los miembros del Instituto y otros colegas.

*La próxima conferencia será:*

*“Modern versus ancient controls on sedimentary systems; the present is not
always the key to the past"*


Disertante: *Dr. Poppe de Boer*
Professor in Sedimentology at Utrecht University


The basic idea of uniformitarianism dating back to the late 18th century -
when Hutton, Whewell, Lyell and others proposed the idea of
uniformitarianism in contrast to catastrophism. The idea is that physical
and chemical laws have not changed, and that in the distant past
sedimentary processes have acted as they do today. However, obviously all
kinds of controls have changed and varied in the course of geological time.
E.g. the rate of *eustatic sea-level change* has varied, with rates up to a
metre per 100 years during icehouse periods and rates several orders of
magnitude (s)lower during greenhouse periods. Such differences lead to a
different response of sedimentary systems.

Why is the Black Sea the only present-day example fitting the so-called
Black Sea Model for anoxia and *black shale* deposition? Why is extensive
anoxia, as in the North Atlantic and Tethys Oceans during the middle
Cretaceous, not encountered in present-day oceans? Why is there a dominance
of reports of *orbital cyclicity* from the Cretaceous? Is the absence of
recent analogues for *Saline Giants* as in the Mediterranean during the
Miocene and in the Permian Paradox Basin accidental or due to different
conditions in those days?

The present-day Earth’s surface with high mountains (Himalaya, Andes) is
not representative for various other parts of the geological record; for
example, after the break-up of Pangea major plate collisions were largely
absent, with consequences for the continental relief and the character and
extent of *terrestrial and shallow marine environments. * Such differences
may explain biological evolutionary trends and the occurrence of
sedimentary facies without recent analogues such as *lithographic
limestones*.

Poppe de Boer

Poppe de Boer is emeritus Professor in Sedimentology at Utrecht University.
He was IAS Treasurer from 1986-1994 and IAS President from 2010-2014. He
published on a wide variety of topics among which tide-influenced
sedimentary facies, orbital signals in sedimentary successions,
organic-rich facies. He co-edited volumes on "Tide-influenced sedimentary
environments and facies" (1988), "Orbital forcing and cyclic sequences"
(IAS SP 19, 1994), "Analogue and numerical forward modelling of sedimentary
systems; from understanding to prediction" (IAS SP 40, 2008), and on
"Phanerozoic black shales and oceanic anoxic events: geochemistry,
sedimentology and stratigraphy" (2012). Current research interests concern
catastrophic events, today’s developing greenhouse, tidal facies, and
sedimentary systems in arid environments.

Fecha: *Martes 31 de octubre**.*
Horario: *14:00hs.*
Lugar: *Aula Aguirre (número 38).*
Duración: *45 minutos.*
Los esperamos con café y galletitas de por medio.

*Coordinadores Dres. Silvia Marcomini, Gisel Peri, Patricia Cicci*
*oli y Pablo Leal*

Dra. Patricia L. Ciccioli
Dto. Ciencias Geológicas - IGeBA
FCEN- Universidad de Buenos Aires - CONICET
Ciudad Universitaria-Pabellón 2, 1° piso,
Buenos Aires-Argentina C1428EHA
Tel: (+54-11) 5285-8237 / 4783-0696
e-mail:  ciccioli en gl.fcen.uba.ar <alfredo en gl.fcen.uba.ar>
patriciaciccioli en gmail.com <alfambrosio en yahoo.com.ar>
https://www.researchgate.net/profile/Patricia_Ciccioli
https://uba.academia.edu/PatriciaLCiccioli

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