ABSTRACTS / RESUMES - Comitato Glaciologico Italiano

All forms show a more or less distinguished depression at
the break in slope between the talus area and the rock glacier.
The study site lies in an area where the glacier history
such as the maximum extend of the Weichselian icesheet is
strongly discussed among geoscientists. An intensive field
and laboratory measurement program was therefore launched
on this site with the objectives to: i) calculate volumes
of the rockglaciers in relation to the mass-contributing
rock-cliff area, ii) study the velocity field of the rockglaciers,
iii) study the differences in ice-content in relation to
rockglacier size, location and contributing area.
The aim of the program is to model mass flux and development
time of the forms. This is important for understanding
the processes both in relation to the origin of the
form and to their particular geometry. The time-scale is
important for the time the area was subaerial exposed.
Contributing area and mass transfere were estimated using
high-resolution digital elevation models of all rockglaciers.
The forms were parameterised with respect to topographic
and geometric characteristics. The dynamics of four selected
rockglaciers were measured in detail applying traditional
surveying and photogrammetric techniques. Rockglacier
thickness and estimations of icecontent were gained by
DC-electrical resistivity measurements on five rockglaciers.
The paper will present results especially concerning the
analysis and interpretation of the digital elevation models
and the DC-electrical soundings.
LINHUA SONG 1 & FUCHANG WANG 2
Pinnacle karst and shilin karst in tropical
and subtropical climatic zones in China
1Group of Karst and Speleology, Institute of Geography,
Chinese Academy of Sciences, Beijing 100101
2 Administration of Lunan Shilin National Park of China,
Yunnan Province, 652211, China
The pinnacle karst and shilin karst all developed in the
present tropical and subtropical zones or the paleo- tropical
and subtropical zones, so they might be defined as one
of tropical-subtropical karst landscape. The typical pinnacle
karst in China develops in Xiean area, Baoding County,
Hainan Province. It covers about 0.4 km', The annual
mean temperature reaches up to 22°C and precipitation
1700-2000 mm. The pinnacle karst developed in the Sirian
thick and pure limestone mostly covered by the rainforest.
The limestone has been eroded as the shapes of niddle,
sward, bamboo titch, pig tail etc. The 60 % of pinnacles
reach 5-15 m high, and 400/0 are 15-30 m high. All the pinnacles
and ridges if the solutional potts are very sharp like
the knife. There is no any deposits in the solutional pits
and depressions on the pinnacle hills. The pits are connec-
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ted with the horizontal caves with few deposits and speleothem.
The shilin (stone forest) landscape have been discovered in
more than 20 regions in tropical and subtropical areas in
China. The magic shilin landscape is in Lunan County,
Yunnan Province.
The Lunan shilin distributes in an area of 970 km', of which
350 km 2 of shilin is defined as the protected area and
the national park of China. It belongs to the subtropical
climatic zone, the annual average temperature is 15°C and
precipitation 936 mm, Geograpphically, it is situated in
24°40'-24°05' Nand 103°10'-103°30' E. The national park
includes 12 shilin subregions. The shilin landscape developed
in the Lower Permian pure and block (over 30 m
thick) limestone with gentle dipping. The columns are 10­
30 m high, max. 48 m. Generally, the columns may divided
into 4 parts: (1) buried column, (2) smooth and white column
just out from soil, (3) columns with normal karstic
features, and (4) the pinnacle features on the top of columns.
In the most area in Lunan shilin, the E-N red deposits
and P basalt covered on the shilin features and depressions
or filled in the fissures of limestone. Under the shilin
landscape, the drainage system and cave system with rich
speleothems well developed.
The conclusion may be drawn as follows: the pinnacle karst
developed in the tropical zone, rainwater erosion is its
main origin, the origination rather simple and short evolution
processes; the Lunan shilin karst mainly developed in
the tropical and subtropical zones, the main origination is
subsoil erosion and reformed by the rainwater, it formed
and developed since Permian, it experienced the processes
of denudation and deposit for several times, that means its
evolution processes are very complicated.
ASUNCION SORIANO, ANGEL L. CORTES,
ADOLFO MAESTRO & ANTONIO M. CASAS
Origin of the satellite lineaments in the Neogene rocks
of the Almazan Basin (N Spain)
Departamento de Geologia, Universidad de Zaragoza,
Plaza San Francisco, 50009 Zaragoza, Spain
The Almazan Basin is located within the NW part of the
Iberian Chain. It is limited by the Cameros Massif to the
north, the Aragonian Branch to the east and the Castilian
Branch to the south. The basin was filled by Paleogene and
Neogene age deposits. The Neogene sediments (conglomerates,
sandstones, lutites and carbonates) correspond to alluvial
fans and lacustrine facies. Folds and thrusts in Palaeozoic
to Paleogene rocks of the Cameros Massif and
Aragonian Branch show an arcuate shape with trends
varying between ENE and NW-SE. Neogene beds lie unconformably
on older rocks and are horizontal in most