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Metadata: 2005 Strategic Environmental Assessment SEA6 Technical Report - The Distribution and extent of methane-derived authigenic carbonate (Irish Sea)
Abstract:
This report is a contribution to the Strategic Environmental Assessment (SEA6) conducted by the Department of Trade and Industry (now Department of Energy and Climate Change). Methane-derived authigenic carbonate (MDAC) is formed as a consequence of the anaerobic oxidation of methane by consortia of bacteria. MDAC develops as a rock-like concretion when a carbonate precipitate cements normal seabed sediment; the carbon of this carbonate is derived from methane. It occurs as crusts or slabs at the seabed, or as exposed lumps. The occurrence of MDAC is evidence of methane seepage, although the seepage is not necessarily going on at the present time. Large quantities of MDAC indicate that methane seepage has occurred over a prolonged period of time. 'Submarine structures formed by leaking gas' have been identified by the European Commission's Habitats Directive as habitats worthy of protection. The distribution of MDAC in UK waters is poorly known. This report summarises the available information relevant to MDAC in the SEA6 area, including data acquired by surveys specifically conducted in support of this SEA in 2004. Carbon isotope data for samples recovered in 2004 have confirmed that the cemented hard grounds from two of the areas studied, Texel 11 and Holden's Reef, are composed of MDAC.
Data holder:
British Geological Survey (BGS)
| Other details | ||
| Internal code | Internally assigned metadata identifier | 6700 |
| Title | The title is used to provide a brief and precise description of the dataset such as 'Date', 'Originating organisation/programme', 'Location' and 'Type of survey'. All acronyms and abbreviations should be reproduced in full. | 2005 Strategic Environmental Assessment SEA6 Technical Report - The Distribution and extent of methane-derived authigenic carbonate (Irish Sea) |
| File Identifier | The File Identifier is a code, preferably a GUID, that is globally unique and remains with the same metadata record even if the record is edited or transferred between portals or tools. | aba64100-c150-4de3-e044-0003ba6f30bd |
| Resource Identifier | This is the code assigned by the data owner. | BGS_SEA_92 |
| Resource type | The resource type will likely be a dataset but could also be a series (collection of datasets with a common specification) or a service. | dataset |
| Start date | This describes the date the resource starts. This may only be the year if month and day are not known | 2005-01-01 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2005-01-01 |
| Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | 5 |
| Spatial resolution unit | This describes the unit of spatial resolution which for distance must be metres. | http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/uom/gmxUom.xml#m |
| Frequency of updates | This describes the frequency with which the resource is modified or updated i.e. a monitoring programme that samples once per year has a frequency that is described as 'annually'. | notPlanned |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | This report is a contribution to the Strategic Environmental Assessment (SEA6) conducted by the Department of Trade and Industry (now Department of Energy and Climate Change). Methane-derived authigenic carbonate (MDAC) is formed as a consequence of the anaerobic oxidation of methane by consortia of bacteria. MDAC develops as a rock-like concretion when a carbonate precipitate cements normal seabed sediment; the carbon of this carbonate is derived from methane. It occurs as crusts or slabs at the seabed, or as exposed lumps. The occurrence of MDAC is evidence of methane seepage, although the seepage is not necessarily going on at the present time. Large quantities of MDAC indicate that methane seepage has occurred over a prolonged period of time. 'Submarine structures formed by leaking gas' have been identified by the European Commission's Habitats Directive as habitats worthy of protection. The distribution of MDAC in UK waters is poorly known. This report summarises the available information relevant to MDAC in the SEA6 area, including data acquired by surveys specifically conducted in support of this SEA in 2004. Carbon isotope data for samples recovered in 2004 have confirmed that the cemented hard grounds from two of the areas studied, Texel 11 and Holden's Reef, are composed of MDAC. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | The report was prepared by Dr A. G. Judd as part of the UK Department of Energy and Climate Change's Offshore Energy Strategic Environmental Assessment programme. There are no published reports of methane-derived authigenic carbonate (MDAC) in the SEA6 area, but carbon isotope data have confirmed that the cemented hard grounds of two areas studied for the SEA6 project, Texel 11, and Holden's Reef, are composed of MDAC. Geophysical surveys, sampling and photographic surveys of other parts of the SEA6 area have confirmed that indicators of gas seepage (seep plumes, and pockmarks) are present in several other areas, and that acoustic turbidity (shallow gas) is widespread. A specific objective of the SEA6 surveys was to investigate possible occurrences of MDAC in examples of a range of the geological contexts present in the SEA6 area. To that end 12 study areas were identified. Two surveys were undertaken during the period 24th August to 31st October 2004 geophysical surveys (S/V Meridian): single-beam echo sounder (SBES), multi-beam echo sounder (MBES), side-scan sonar (SSS), and chirp sub-bottom profiler (SBP); photography, seabed sediment sampling, and water sampling (S/V Kommandor Jack). |
| Additional information | This describes relevant references to the data e.g. reports, articles, websites plus other useful information not captured elsewhere. | http://www.offshore-sea.org.uk/site/index.php |
| Related keywords | ||
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | NDGO0001 |
| Keyword title | NERC OAI Harvesting | |
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Bathymetry and Elevation |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Concentration of alkanes in sediment samples | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Sediment acoustics | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Seismic reflection | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Side-scan sonar | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Geology | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | crust | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | sediment | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 55.3 |
| East | The eastern-most limit of the data resource in decimal degrees | -4 |
| South | The southern-most limit of the data resource in decimal degrees | 51.7 |
| West | The western-most limit of the data resource in decimal degrees | -6 |
| Responsible organisations | ||
| Role | The point of contact is person or organisation with responsibility for the creation and maintenance of the metadata for the resource. | pointOfContact |
| Organisation name | British Geological Survey (BGS) | |
| Individual name | Mary Mowat | |
| Phone | +44 (0)131 667 1000 | |
| Fax | +44 (0)131 668 4140 | |
| offshoredata@bgs.ac.uk | ||
| Role | The custodian is the person or organisation that accepts responsibility for the resource and ensures appropriate care and maintenance. If a dataset has been lodged with a Data Archive Centre for maintenance then this organisation is be entered here. | custodian |
| Organisation name | British Geological Survey (BGS) | |
| Individual name | Paul Henni | |
| Phone | +44 (0)131 667 1000 | |
| Delivery point | Murchison House, West Mains Road | |
| Postal code | EH9 3LA | |
| City | Edinburgh | |
| Country | UK | |
| offshoredata@bgs.ac.uk | ||
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Department for Energy and Climate Change (DECC) | |
| Phone | +44 0300 060 4000 | |
| Fax | +44 (0) 1823 284077 | |
| Delivery point | Admiralty Way | |
| Postal code | SW1A 2HD | |
| City | London | |
| Country | UK | |
| enquiries@decc.gsi.gov.uk | ||
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | http://www.bgs.ac.uk/data/sea/home.html |
| Locator name | Name of the web resource | Strategic Environmental Assessment (SEA) data portal |
| Locator function | Code that describes the function of the resource. ISO function code chosen from ISO 19115-1 Codelist | download |
| Dataset constraints | ||
| 20 Limitations on Public Access - Access constraints | intellectualPropertyRights | |
| 21 Conditions for Access and Use - Use limitation | This states any constraints on use of the data. Multiple conditions can be recorded for different parts of the data resource. If no conditions apply, then `No condtions apply` is recorded. This uses free text. | The SEAs data were produced as part of the UK Department of Energy and Climate Change's Offshore Energy Strategic Environmental Assessment programme; Crown Copyright, all rights reserved. The DECC SEA must be acknowledged in any maps or publications that make use of the data. All the data files are freely available to the public. The Strategic Environmental Assessment (SEA) data portal provides free access to available data and reports which have been produced through the SEA process. The site is run and managed by BGS on behalf of the Department of Energy and Climate Change (DECC). Many files can be downloaded directly from this website. Those that are too large to download can be ordered via the website for postal delivery from BGS. BGS (NERC) has been contracted by DECC to publish SEA datasets on its behalf. All intellectual property rights (including , without limitation, copyrights, database rights and all other rights which subsist or may at any time in the future subsist in the Dataset(s)) in the Dataset(s) ('Intellectual Property Rights') are owned by DECC (formerly the Department of Trade and Industry, and the Department for Business, Enterprise and Regulatory Reform). BGS has been authorised by DECC to use SEA datasets for all purposes but on a 'not-for-profit basis'. BGS has been authorised by DECC to pass on SEA datasets to third parties so that they can use them for all purposes but on a 'not-for-profit' basis. |
| Available data formats | ||
| Data format | Format in which digital data can be provided for transfer | Documents |
| Version info | ||
| Date of publication | The publication date of the resource or if previously unpublished the date that the resource was made publicly available via the MEDIN network. | 2005-03-01 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-04-19 |
| Metadata date | The date when the content of this metadata record was last updated. | 2011-08-30 |
| Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN Discovery Metadata Standard |
| Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | Version 2.3.5 |