Core sample

Sediment coring

There is a dedicated coring system on the vessel and other units can be brought on board by research groups as required.

Piston corer

Long Core System

The gravity/piston coring system undertakes full ocean depth soft sediment coring, typically in unconsolidated to semi-consolidated calcareous muddy sands, silts and deep-sea oozes.

The coring system can be assembled with different length cores from 3m to a maximum of 24m.

The coring unit is deployed from the starboard side of the vessel using a dedicated coring deployment system comprising a winch, overhead coring boom and core handling system.

The coring unit consists of the head weight, coring tube, removable inner core liner and core catcher which can be configured as a gravity corer or piston corer.

When configured as a piston corer it has an additional piston cable with release mechanism and a small trigger core. The trigger core reaches the bottom first and triggers the release of the main core which freefalls to the bottom and penetrates the silt. The tube is drawn back out of the silt with core catchers preventing the silt from coming out of the coring tube.

Kasten core

The Kasten core is a gravity coring system with a 150mm square core which is available in 2, 3 or 4m lengths. The Kasten core uses a track and tilt system for deployment/retrieval and is suitable for full-ocean depth coring.

An advantage of the Kasten corer is that cores can be opened immediately after retrieval as one side of the core barrel can be removed giving access to the entire length of the core.

KC Multicorer

The KC multicorer is designed to sample in softer sediments at any depth. It has six tubes to collect replicate samples. Each tube is 100mm diameter and 600mm long. The unit is armed by lifting the entire centre section and securing the lids and lower gates open. The corer is then deployed, lowered to the sea-floor and upon ‘landing’ it uses 300kg of lead mounted to the top of the centre section to help the tubes penetrate the sea-floor. When retrieval begins the lids are closed creating a suction effect to help collect and retain the sample. When the tubes leave the sediment the lower gates close retaining the sample.

Updated: 16 August 2017