The tectonic subsidence of the western margin of the Victoria Land basin has been estimated from the physical properties and ages of the sediments in the Cape Roberts Project drillcores 2/2A and 3, using backstripping techniques. The analysis indicates a total tectonic subsidence of about 660 m at this location between 34 Ma and the present. Two main trends are defined, i) about 230 m/m.y. from 34 Ma to 32.5 Ma, and ii) about 23 m/m.y. from 32.5 Ma to 21 Ma. Since 21 Ma, the subsidence is not well constrained. Extrapolation indicates a very low subsidence rate, but uplift within this period may have greatly affected the estimate. Seismic reflection data further east, towards the centre of the basin, indicates several episodes of extension and associated high subsidence rates since 21 Ma.
Subsidence at the Cape Roberts Project (CRP) drillsites from backstripping techniques, Victoria Land Basin, Antarctica
De Santis L.
;
2001-01-01
Abstract
The tectonic subsidence of the western margin of the Victoria Land basin has been estimated from the physical properties and ages of the sediments in the Cape Roberts Project drillcores 2/2A and 3, using backstripping techniques. The analysis indicates a total tectonic subsidence of about 660 m at this location between 34 Ma and the present. Two main trends are defined, i) about 230 m/m.y. from 34 Ma to 32.5 Ma, and ii) about 23 m/m.y. from 32.5 Ma to 21 Ma. Since 21 Ma, the subsidence is not well constrained. Extrapolation indicates a very low subsidence rate, but uplift within this period may have greatly affected the estimate. Seismic reflection data further east, towards the centre of the basin, indicates several episodes of extension and associated high subsidence rates since 21 Ma.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
