- Petrological Database of the Ocean Floor
The Petrological Database of the Ocean Floor ( [http://www.petdb.org PetDB] ) is a
relational databaseand repository for global geochemical data on igneousand metamorphicrocks generated at mid-ocean ridgesincluding back-arc basins, young seamounts, and old oceanic crust. These data are obtained by analyses of whole rock powders, volcanic glasses, and minerals by a wide range of techniques including mass spectrometry, atomic emission spectrometry, x-ray fluorescencespectrometry, and wet chemical analyses. Data are compiled from the scientific literature by PetDB data managers, as well as being provided by members of the scientific community. PetDB is supported by the U.S. National Science Foundation.
Development of [http://www.petdb.org PetDB] began in 1995 when scientists from the Lamont-Doherty Earth Observatory ( [http://www.ldeo.columbia.edu LDEO] ) C. Langmuir (now at Harvard University), W. Ryan, and A. Boulanger saw the potential impact of new information technologies such as the world wide web and relational databases on the use of scientific data in research and in the classroom.
The initial funding phase of PetDB (1996-2001) supported the development of the database structure and population with data values. Renewed funding (2002-2007) permitted the migration of the database into an ORACLE-based environment administered by the Center for International Earth Science Information Network ( [http://www.ciesin.columbia.edu CIESIN] ) of [http://www.columbia.edu Columbia University] , continued data entry, and enhancement of the web-interface with a more user-friendly design.
The relational database structure of PetDB is a sample-based implementation and designed to accommodate chemical and petrological data for any type of rock sample, along with essential
metadatathat provide information about the sample (e.g. location and time of collection, taxonomy, petrographic description) and the data quality (e.g. analytical procedure, reference standard measurements) (Lehnert et al. 2000). Initially developed for PetDB and its subareal counterpart [http://georoc.mpch-mainz.gwdg.de/georoc GEOROC] , this relational data model has demonstrated utility and flexibility by its application in subsequent geochemical database projects including [http://navdat.kgs.ku.edu/ NAVDAT] , [http://www.geol.lsu.edu/metpetdb/index.html MetPetDB] , [http://www.earthchem.org/EarthChemWeb/pg2.jsp EarthChem Deep Lithosphere] , and [http://www.seddb.org SedDBv.0.1] .
Since its inception, PetDB has supported a wide array of scientific endeavors, providing easy access to a comprehensive global dataset of geochemical data for
mid-ocean ridgebasalts and abyssal peridotites. PetDB has been cited in more than 147 peer-reviewed scientific articles as the source of data used to develop and test new hypotheses which range from the chemical and mineralogical composition of Earth’s mantle (e.g. Salters & Stracke 2004, Thirlwall et al. 2004), to the generation and evolution of continental and oceanic crust (e.g. Weyer et al. 2003, Cipriani et al. 2004), melt transport phenomena (Braun & Kelemen 2002, Spiegelman & Kelemen 2003), to global geochemical seawater budgets (e.g. van der Flierdt et al. 2004).
PetDB is administered by the [http://www.geoinfogeochem.org Geoinformatics for Geochemistry] group at LDEO-CIESIN headed by K. Lehnert and is a member of the
NSF-supported [http://www.earthchem.org EarthChem ] project along with complementary database efforts [http://georoc.mpch-mainz.gwdg.de/georoc GEOROC] and [http://navdat.kgs.ku.edu/ NAVDAT] .
In its current application, PetDB contains and provides on-line access to a complete set of chemical parameters (currently a total of 254 elements, oxides, isotopes and isotope ratios), as well as petrographic (mode) data through a sophisticated query interface. New data are continuously being added to the database as it is published and submitted to PetDB by authors. Data for a specific sample that is generated by different labs or published by various authors are linked and integrated through the use of a unique sample identifier generated by the database application.
As of April 2007, PetDB holdings consist of:
* Samples: 35016
* Rock values (unspecified): 17034
* Whole rock values: 356549
* Glass values: 305472
* Mineral values: 157667
* Melt Inclusion values: 12232
* Total values: 848998
Data from PetDB can be viewed in HTML tables and downloaded in spreadsheets in XLS format. During selection of chemical parameters a user can choose to retrieve data as individual values (each row in the data table contains values measured on the same samle with the same method and linked to the same reference) or in precompiled format. The precompiled format arranges all data associated with a sample in a single row, even when data is sourced from multiple publications. In cases where there is more than one data value for a particular chemical item, the precompilation algorithm selects the most recent analysis and the most precise method available. Links in the HTML table permit the user to access more detailed information about the sample, reference or data value (analytical procedure). The final spreadsheet output contains two worksheets. The first contains queried chemical data, geospatial coordinates, and abridged methods and references, while the second contains
metadataon analytical methods and publication information.
* Braun, M. G. and P. B. Kelemen (2002). "Dunite distribution in the Oman Ophiolite: Implications for melt flux through porous dunite conduits" G-CUBED 3(11): 8603. [http://dx.doi.org/10.1029/2001GC000289 doi:10.1029/2001GC000289]
* Cipriani, A., H. K. Brueckner, et al. (2004). "Oceanic crust generated by elusive parents: Sr and Nd isotopes in basalt-peridotite pairs from the Mid-Atlantic Ridge." GEOLOGY 32: 657-660. [http://dx.doi.org/10.1130/G20560.1 doi:10.1130/G20560.1]
* Lehnert, K.A., Su, Y., Langmuir, C.H., Sarbas, B., Nohl, U., "A global geochemical database structure for rocks", G-CUBED, Volume 1, 2000. [http://dx.doi.org/10.1029/1999GC000026 doi:10.1029/1999GC000026]
* Salters, V. J. M. and A. Stracke (2004). "Composition of the depleted mantle." G-CUBED 5(5). [http://dx.doi.org/10.1029/2003GC000597 doi:10.1029/2003GC000597]
* Spiegelman, M. and P. B. Kelemen (2003). "Extreme chemical variability as a consequence of channelized melt transport " G-CUBED 4. [http://dx.doi.org/10.1029/2002GC000336 doi:10.1029/2002GC000336]
* Thirlwall, M. F., M. A. M. Gee, et al. (2004). "Mantle components in Iceland and adjacent ridges investigated using double-spike Pb isotope ratios." GEOCHIM COSMOCHIM ACTA 68: 361-386. [http://dx.doi.org/10.1016/S0016-7037(03)00424-1 doi:10.1016/S0016-7037(03)00424-1]
* van de Flierdt, T., M. Frank, et al. (2004). "Tracing the history of submarine hydrothermal inputs and the significance of hydrothermal hafnium for the seawater budget -- a combined Pb-Hf-Nd isotope approach." EARTH PLANET SCI LETT 222: 259-273. [http://dx.doi.org/10.1016/j.epsl.2004.02.025 doi:10.1016/j.epsl.2004.02.025]
* Weyer, S., C. Muenker, et al. (2003). "Nb/Ta, Zr/Hf and REE in the depleted mantle: implications for the differentiation history of the crust-mantle system." EARTH PLANET SCI LETT 205: 309-324. [http://dx.doi.org/10.1016/S0012-821X(02)01059-2 doi:10.1016/S0012-821X(02)01059-2]
* [http://www.petdb.org PetDB]
* [http://www.earthchem.org EarthChem]
* [http://georoc.mpch-mainz.gwdg.de/georoc/ GEOROC]
* [http://navdat.kgs.ku.edu/ NAVDAT]
* [http://www.seddb.org SedDB]
* [http://www.geol.lsu.edu/metpetdb/index.html MetPetDB]
* [http://www.geoinfogeochem.org Geoinformatics for Geochemistry]
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