Identification

Title

Physical Properties of Oceanic lower crustal and upper mantle rocks from Atlantis Massif (NERC grant NE/N012402/1)

Abstract

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.

Resource type

dataset

Resource locator

https://doi.pangaea.de/10.1594/PANGAEA.873535

function: download

Unique resource identifier

code

http://data.bgs.ac.uk/id/dataHolding/13607160

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Additional information source

NERC grant NE/N012402/1

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

originating controlled vocabulary

title

GEMET - INSPIRE themes

reference date

date type

publication

effective date

2008-06-01

Keyword set

keyword value

Geophysics

Serpentinite

Gabbro

Attenuation

Resistivity

Permeability

Oceanic crust

originating controlled vocabulary

title

BGS Thesaurus of Geosciences

reference date

date type

revision

effective date

2011

Keyword set

keyword value

NERC_DDC

Geographic location

West bounding longitude

-42.3300

East bounding longitude

-41.8300

North bounding latitude

30.3300

South bounding latitude

30.0000

Temporal reference

Temporal extent

Begin position

2015-10-24

End position

2016-08-23

Dataset reference date

date type

creation

effective date

2015-10-24

Frequency of update

notApplicable

Quality and validity

Lineage

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.

Conformity

Conformity report

specification

title

INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology

reference date

date type

publication

effective date

2011

degree

false

explanation

See the referenced specification

Conformity report

specification

title

Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services

reference date

date type

publication

effective date

2010-12-08

degree

false

explanation

See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF

Data format

name of format

TAB

version of format

Constraints related to access and use

Constraint set

Limitations on public access

Constraint set

Limitations on public access

The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.

Responsible organisations

Responsible party

contact position

Shc of Ocean & Earth Science

organisation name

University of Southampton

email address

not available

responsible party role

pointOfContact

Responsible party

contact position

Ocean and Earth Science

organisation name

University of Southampton, National Oceanography Centre Southampton

full postal address

National Oceanography Centre, Waterfront Campus, European Way

Southampton

SO14 3ZH

email address

not available

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

organisation name

British Geological Survey

full postal address

Environmental Science Centre,Keyworth

NOTTINGHAM

NG12 5GG

United Kingdom

telephone number

+44 115 936 3100

email address

enquiries@bgs.ac.uk

responsible party role

pointOfContact

Metadata date

2022-11-29

Metadata language

eng