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Gravity Studies of the Western Antarctic Region - New Possibilities in Geophysical modelling.
Yu.V. Kozlenko, I.N. Korchagin, V.D. Solovjov
Institute of Geophysics of National Academy of Science of Ukraine, E-mail:
valsolov@igph.kiev.ua.
Abstract
Knowledge of gravity anomalies space distribution has a great value
to understanding their relationships with geology and major crust features
of different tectonic
elements of the West Antarctic region that is rather poorly studied now.
That is why there is a necessity to use different gravity measurements- high
resolution
satellite models in conjunction with shipboard, airborne and land based gravity-
for 3D geophysical modelling. Usually short-wave anomalies show obvious correlation
with the geology of outcrops which consist of Mesozoic plutons of diverse
composition emplaced in metamorphic rocks and members of the Antarctic Peninsula
Volcanic
Group.
Simultaneous analysis of remote altimeter, marine on-board and land base
gravity measurements allows to elaborate some criteriouses of geological
objects density models construction in wide depth’s values- from near surface
local structures to large-scale upper mantle heterogeneities.
First experience of such works becomes available during “Ernst Krenkel” Expeditions
where a possibility to compare the observed on-board marine gravity anomalies
with satellite altimeter data was realized. It was noted that close relationship
between the local bottom relief features and calculated Geosat altimeter data
was not existed. Both types of measurements are confirmed to anomalies with
total length that is more than 20 km.
It is known that the Antarctic land base gravity data sets are characterized
by standard errors estimated about 2,5 mGal for Free-air anomalies in the
previous works. New results of such measurements are not published and realization
of
international program to compile Antarctic gravity data south of 60°S is
not finished. Now it is necessary to compile different gravity anomalies data
into a digital database and prepare the anomaly map for the Vernadsky station
region.
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