Estimation of biogenic silica contents in marine sediments using seismic and well log data: Sediment Drift 7, Antarctica |
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| Authors: | R C Neagu U Tinivella V Volpi M Rebesco A Camerlenghi |
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| Institution: | (1) Istituto Nazionale di Oceanografia e di Geofisica Sperimentale 42/C, 34010 Sgonico, Trieste, Italy;(2) ICREA and GRC Geociències Marines, Departament d’Estratigrafia, Paleontologia i Geociències Marines, Universitat de Barcelona, C/ Martí i Franquès, s/n, 08028 Barcelona, Spain;(3) 3D Lab, School of Earth, Ocean and Planetary Sciences, Cardiff University, Main Building, Park Place, Cardiff, CF10 3YE, UK |
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| Abstract: | Petrophysical properties (wet bulk density, porosity, P-wave velocity) are used to predict biogenic silica contents along
a seismic reflection profile that ties two well sites, 1095 and 1096, drilled by Ocean Drilling Program (ODP) Leg 178 on sediment
drifts on the Pacific continental margin of the Antarctic Peninsula. The biogenic silica contents along the seismic reflection
profile were estimated on the basis of three hypotheses about petrophysical properties distributions in the two boreholes
and statistical relationships between biogenic silica and other petrophysical properties, which were established on various
sediment layers within the boreholes. Our study demonstrates the possibility to reliably predict the distribution of biogenic
silica in the sub-seabed sediments if seismic data processed with amplitude preservation are used and statistical relations
are considered. We conclude that the statistical extrapolation of biogenic silica content along seismic reflection profiles
tied to borehole data is an efficient tool to quantify the amounts of silica undergoing crystalline transformation, which
may have strong implications for submarine slope destabilisation. |
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| Keywords: | Antarctic Peninsula Sediment drifts Biogenic silica Opal-A Opal-CT |
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