USCS research ship 'S P Lee' in the Ross Sea

Antarctica NZ Data

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DescriptionUSCS research ship 'S P Lee'| during February 1984. the USGS ship 'S P Lee' conducted a multidisciplinary survey of the western Ross Sea continental shelf and margin. The acquisition of multichannel seismic (MCS) data was the primary objective with concurrent underway geophysical measurements such as gravity geomagnetic and seismic refraction and single channel reflection measurements. A geological and station programme of coring, dredging and high resolution seismic profiling for geotechnical and geochemical studies and heat flow measurements was also undertaken. The cruise covered the Victoria Land basin and Iselin Bank areas and successfully recorded 2350km of MCS and similar or larger amounts of other underway data| 15 gravity cores| 2 dredges and data at 3 heat flow stations and 31 seismic refraction stations were also obtained. One line of deep seismic reflection measurements (15 second two way time) was recorded across the Victoria Land Basin. Generally ice and weather conditions controlled the accessibility| quality and quantity of data collected. During parts (up to 305) of the 'cruise'| high winds (30-50kt) and large seas (4-6m) constrained or prevented station operation and collection of MCS data. The data required further analysis but several observations can be made from a preliminary analysis made of the data while at sea. The Victoria Land Basin| which lies adjacent to the Transantarctic Mountains| contains 2 to5 km of sedimentary rocks which are uplifts| eroded and truncates on its western side| are probably extensionally down faulted on its axial region and are normally faulted and intruded by Cenozioc (?) volcanic rocks on its eastern side. Sedimentary horizons appear to continue from VLB beneath the volcanic intrusives and into the Ross Sea. The Iselin Bank appears to be continental in nature and has two large grabens running along its top parallel to its axis. Distinctive sedimentary structures along the base of the eastern margin of the bank indicate that strong boundary currents have been active. A final report covering all scientific aspects and results of the cruise is planned for release by USGS early in 1983| From USGS Geoscience Survey: Ross Sea| Antarctica| FJ Davey| AK CooperPhotographerUnknownSeason1984-1985Date Taken1984-1985 SeasonOriginalPrintLocationRoss Sea

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