INVESTIGADORES
DI PRINZIO Carlos Leonardo
congresos y reuniones científicas
Título:
Application of novel fabric and texture analysis techniques to GISP2.
Autor/es:
DI PRINZIO, CARLOS LEONARDO; WILEN L. A.
Lugar:
san fransisco california usa
Reunión:
Congreso; 2002 Fall Meeting AGU; 2002
Institución organizadora:
American Geophysical Union
Resumen:
Recent development of a fully automated digital instrument for fabric analysis has led to a dramatic increase in the quality
and quantity of c-axis data from ice cores (Hansen and Wilen, 2002 J. Glaciol.). The new data allow straightforward
application of statistical techniques to evaluate nearest-neighbor correlations between grains for probing active grain
formation processes such as polygonization and/or recrystallization (Alley and others, 1995 J. Glaciol.). After demonstrating
some of the software tools we have developed to facilitate this type of analysis, we will present and discuss results for
horizontal and vertical sections from a range of depths at GISP2. These results show unambiguous correlations in c-axis
direction for nearest-neighbor grains, but there are fairly large variations in the strength of the correlation even among
multiple sections from a single depth.
We will also present experimental results of correlations between grain shape and c-axis orientation. The results will be
discussed in relation to expected correlations from simple models of fabric evolution. There are surprising discrepancies
that might be attributed to polygonization. If this conjecture proves correct, this type of analysis may provide an
alternative technique (to that described above) to probe active grain formation.