ABSTRACTS / RESUMES - Comitato Glaciologico Italiano

IRINA BRINDUSA UNGUREANU
Au sujet de I'accesibilite naturelle du relief
Departement de Geographie, Universite «AI. 1. Cuza»,
Boulevardul Copou 20A, 6600 Iasi, Roumanie
En tant que resultante interactive dans le geosysteme (environnement)
le relief participe d'une maniere transformante
dans l'existence de la societe humaine et, de ce point de
vue, l'on peut constater que des traits essentiels du paysage
des grandes regions ont ete influences ou meme determines
par le relief.
Par 1'integration de certains caracteres quantitatifs et qualitatifs
du relief, nous proposons un indicateur complexe de
l'accessibilitc naturelle du relief, nous prouvons sa pertinence
par des applications dans des regions differentes de
la Roumanie et nous le cartographions par un methode
propre, la visualisation progressive.
A part son importance fondamentale pour l' analyse geosystemique
et pour la regionalisation geographique, et indicateur
a aussi des valences applicatives (dans les etudes de
faisabilite pour les batiments, les amenagements fonciers,
le tourisme, les voies de communication e. a.).
GERMAN URBAN LAMADRID
Compared geomorphology: three intrusive bodies with
morphology inverse: Tlamacazapa, Huitziltepec and
Coaxtlahuacan, Guerrero, Mexico
University of Guerrero State, South Mexico
Three bodies of a medium size (1-1.5 km of diameter) are
fairly line up north-south in a 150 km of distance. Such
fact in other circumstances could be insignificant but in
these cases morphogenetic processes have played an important
role to differentiate from each other. From these
examples we can gather a lot of worthly lessons of the inmidiate
past, specially because most of the bodies are quite
exposed, thus it represent a good chance to study them.
Geologic settings are in general quite similar: intrusive bodies
with a qranodioritic-cuarzmonzonitic composition have
intruded mesozoic limestones, upwarping hills around
them. Structurally speaking they are not so different; the
domic structure is predominant, and faults above and
around are common.
In just 2' of latitude drastic climatic changes occurr. From
the southern body (17' lat north) wich is located in warmhumid
climate to the middle one in a warm-dry zone; and
the northern one in a temperate to warm-dry (18'5 lat.
north). Hence Karst processes are quite differenciated
among them.
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Tlamacazapa (2000 m a.s.l. is the northern one) is surrounded
by a wide field of deep sink holes, dolinas, and a huge
gruta and spring water sprout at north. A deep basin develops
onto granitic rock, with a well integrated dendritic
drainage pattern.
Huitziltepec is located at 1500 m a.s.l. Recent diggings by a
highway have crop out nitid contacts, and a nice almost
flat landscape where the intrusive has been leveled, nevertheless
some crests still remain and also some limestone
blocks were raised. Eastern part is more gently and even
aluvial fans of gentle slope are present at the edge of the
valley. A temporal summer pond embellish the scenary,
corn fields accomplish it even more.
Basin is almost leveled and closed, surface conections to
lower basins ere not so clear, underground connections are
obvious, specially because the great cynetic energy in
between (800 m difference)
Coaxtlahuacan the last and southern case is quite peculiar
and scenic, plenty of sink holes, natural archs and a sumidero
and springs are located at the base of the horizontal
contact with dolimitic rocks. Around many big vertical
blocks «shelter» the intrusive gentle valley. Nevertheless
this is perhaps the most eroded one, also en terms of karstic
«structures».
Eastern edge meet sandstone rocks with much more posibilities
to avoid the erosion. Resulting in a sharp ranqe.
The basin has fairly dense dendritic drainage pattern wich
disappear at contact with calcareous rocks.
Three cases are related to skarn iron-and polysulphides
ores, and to middle distance to another gold-iron mines.
Then any light on morphologic evolution will bring new
tracks for natural resources exploration.
Now is going a deeper morphometric study and a seasonal
video from three cases, wich will put light on many
aspects, specially on terms of underground water, landscape
evaluation and understanding of geosystem-ecosystem
relationships.
JAN URBANEK
Geomophological events of medium scale (case study)
Institute of Geography, Slovak Academy of Sciences, Stefanikova 49,
814 73 Bratislava, Slovakia
The subject of this contribution is a hilly region in Slovakia
- Myjavska pahorkatina. This hilly land was settled and
agricultural exploited since the 14 th century. The agricultural
soil was divided into numerous small lots, worked manually
or with the help of animals. In the mid of 20 th century
the social and property relations changed. Tiny lots
were joined into large fields. Heavy mechanisms and chemical
means were used. The streams were regulated and
dams constructed. A typical phenomenon in this landscape
are intesive present geomorphological processes on slopes,
flood plains, river beds.