Magnetotelluric investigation of the Vestfold Hills and Rauer Group, East Antarctica (time series)

Brief description

This record was harvested by RDA at 2024-02-14T09:51:54.897+11:00 from NCI's Data Catalogue where it was last modified at 2019-06-04T12:06:15.

Full description

The Vestfold Hills and Rauer Group in East Antarctica have contrasting Archean to Neoproterozoic geological histories and are believed to be juxtaposed along a suture zone that now lies beneath the Sørsdal Glacier. Exact location and age of this suture zone are unknown, as is its relationship to regional deformation associated with the amalgamation of East Gondwana. To image the suture zone, magnetotelluric (MT) data were collected in Prydz Bay, East Antarctica, mainly along a profile crossing the Sørsdal Glacier and regions inland of the Vestfold Hills and Rauer Group islands.

MT data were collected by a team from University of Adelaide with support from the Australian Antarctic Division (AAD) in the austral summer of 2008/2009. Thirty four stations were collected along three transects totaling approximately 200 line kilometers, with station spacing varying between 2.5 and 20 km . Instrumentation consisted of six AuScope MT systems using Numeric Resources preamplifiers to overcome the high contact impedance of ice. Magnetic data were variably collected using three-component fluxgate, and two-component (both horizontal) and three-component (two horizontal and one vertical) induction coil magnetometers. Stainless steel plates were used for electrodes (with the face placed horizon- tally in snow or ice) along 100 m dipoles setup in an L-shape. Data were collected for an average of 5 days at a sampling rate of 100 samples/s. All stations where aligned with geomagnetic north (81 degrees west of geographic north). The field team was stationed at the AAD’s Davis Station and transported between stations via helicopter.

Lineage

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