MD03-2698 / Vigo
PI: Antje Voelker (Institute geologic of Mineiro,
department of Geology Marinha, Portugal)
Scientific objective of the project
The aim of this project is to determinate climatic and oceanographic changes off Portugal over the latest Pleistocene at orbital to centennial timescale.
Several disciplines are studied:
- Holocene climate variability
- Changes in ther coastal upwelling intensity and related productivity
- Climate of the interland, continent-ocean linkages, and source to sink relationships for the terrigenous material.
The researchers are looking for the implications of the strong climate oscillations on margin sedimentary process in oder to better understanding the control of the climatic impacts on continental sources of lithogenic material, river discharge, and eolian transport.
Portguese margin records and ice records insure an important contribution for a better knowledge of the past climatic connections at the global level and high-low latitude forcing mechanisms.
Description of the core MD 03-2698
- Date of coring: 20/07/03
- Hour:
- of station: 9:03 UT
- beginning coring: 9:15 UT
- coring: 10:44 UT
- end coring: 12:51 UT
- Site: The levee between the mouths of the Cascais and Setubal Canyons
- Position: 38deg 14'37'' N / 10deg 23'42'' W
- Water depth: 4602 m
- Length: 35.63 m
- Study:
- sediment transport from the shelf to the abyssal plain with a special focus on the Tagus river sediment supply.
- paleoclimatic and paleoceanographic changes during the Holocene and previous glacial and interglacial stages.
- Remarks:
- section XX (2850-3000 cm): expansion was so important that the upper 4cm of the section had to be cut off and stored separately
- sections V to XXIV: clear coring disturbances
- silty clays in the upper 3 sections
- Sections XX and XXI: homogenous sediment corresponding to an older interglacial
- all others sections: mm-thin black silty turbidites wich are clearly visible in the L* reflectance data (with low frequencies in the deeper sections)