Physical Properties of Oceanic lower crustal and upper mantle rocks from Atlantis Massif (NERC grant NE/N012402/1)
Physical properties of four serpentinite and four gabbro samples acquired respectively at the Southern Wall (IODP leg 357) and at the Central Dome (IODP leg 304-305) of the Atlantis Massif have been measured and analysed in the frame of a NERC UK-IODP moratorium research. The physical property measurements included simultaneous ultra-sonic wave velocities (compressional and shear wave velocities), attenuation, electrical resistivity and permeability under increasing and decreasing effective pressure ranging between 5 and 45 Mpa. Measurements were carried out using the experimental physical property measurement rig of the rock Physics laboratory of the National Oceanography Centre, Southampton, UK. The porosity and the density of the samples were estimated using their wet dry weight difference and the volume of the samples, under atmospheric pressure and room temperature. The aim of this research project was to learn about the physical properties of oceanic lower crustal and upper-mantle rocks and to find a geophysical method that would allow to distinguish between these rocks, remotely. The dataset has been acquired and interpreted by a science party including researchers from the University of Southampton and the National Oceanography Centre. The ultrasonic wave velocities, attenuation and the electrical resistivity for each sample and for each effective pressure (increasing from 5 to 45 with an interval of 10 MPa and decreasing from 45 to 5 with an interval of 20 MPa) are reported in this dataset. Permeability measurements could have been carried out only on 6 samples for which the permeability was high enough to be measured with the experimental rig.
dataset
https://doi.pangaea.de/10.1594/PANGAEA.873535
function: download
http://data.bgs.ac.uk/id/dataHolding/13607160
eng
NERC grant NE/N012402/1
geoscientificInformation
publication
2008-06-01
Geophysics
Serpentinite
Gabbro
Attenuation
Resistivity
Permeability
Oceanic crust
revision
2011
NERC_DDC
-42.3300
-41.8300
30.3300
30.0000
2015-10-24
2016-08-23
creation
2015-10-24
notApplicable
After the IODP leg 357 (March 2016 ), four serpentinite samples from this survey, and four gabbro samples from the previous IODP leg 304- 305 that studied the same region, were sent from Marum IODP core repository to the University of Southampton. The rock samples were 6 cm height working halves of cores with a diameter of 6 cm. They have been resampled as cylindrical mini-cores of diameter of 5 cm and a height of about 1.6 cm. The samples were first oven dried at 40°C for two days, then saturated with 35 g L-1 NaCl brine. Saturated and dry weights and the diameters and heights of the samples were measured tree times in order to estimate the porosity and the density of the samples. The samples have been then kept under vacuum in a pressure vessel of two days and the pore pressure were increased to 5 MPa. Pore pressure was kept constant for the measurements under increasing and decreasing effective pressures. The ultrasonic wave velocities and attenuations were measured using pulse-echo technique. The electrical resistivity is measured with an array of 16 electrodes. For permeability determination, for the most permeable samples we used the Steady State flow technique based on Darcy's law. For the less permeable samples the pressure transmission method has been used. For calibration purposes, both methods were used on one sample.
publication
2011
false
See the referenced specification
publication
2010-12-08
false
See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF
TAB
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Shc of Ocean & Earth Science
University of Southampton
pointOfContact
Ocean and Earth Science
University of Southampton, National Oceanography Centre Southampton
National Oceanography Centre, Waterfront Campus, European Way
Southampton
SO14 3ZH
pointOfContact
British Geological Survey
Environmental Science Centre,Keyworth
NOTTINGHAM
NG12 5GG
United Kingdom
+44 115 936 3100
pointOfContact
2022-11-29