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  1. Geoinformatics for Geochemistry Paper #: 126EarthChem’s Deep Lithosphere Dataset: Web-Based Access to Mantle Xenolith Geochemistry and Petrology Karin A. Block1, Kerstin A. Lehnert1, Mihai N. Ducea2 1Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964 2Department of Geosciences, University of Arizona, Tucson, AZ 85721 Contact: kblock@ldeo.columbia.edu (845) 365-8393 The EarthChem project, an NSF-supported effort to advance access to geochemical data for the broad Earth Sciences, is developing the Deep Lithosphere Dataset, a compilation of geochemical and petrological data from upper mantle and lower crustal xenoliths, with an initial focus on localities in the western United States. The dataset can be accessed at the EarthChem web site (www.earthchem.org) via an interactive user interface that allows users to search the dataset physical conditions inferred from the composition of the underlying lower crust and mantle. Geochemical and petrological studies of xenoliths provide a crucial complement to geophysical and extract customized subsets of data. Addition of physical property data to the dataset will be guided by discussions with EarthScope scientists to insure that the database evolves to maximize its utility. Visit www.earthchem.org to access the EarthChem Deep Lithosphere Dataset. Contact us: info@earthchem.org Southwestern US xenolith locations (courtesy M. Ducea) Plotted on GeoMapApp free downloadable software (www.geomapapp.org) SELECT DATA VIEW and DOWNLOAD QUERY Analytical data values and modeled pressure, temperature and mode reported in the publications are displayed in html tables where each value is linked to detailed information on analytical procedure, standards, and precision. The relational database structure permits the selection of only the analytical data needed by the user. Chemical items are displayed by type of material including rocks, minerals, inclusions, mode. The user can constrain by concentration and analytical method by clicking on the chemical item. The database contains major oxide, trace element and isotopic compositional data for minerals and rocks. A wide range of supplementary information such as sample location, rock type, tectonic setting, analytical technique and data quality can be used as search criteria. Customized datasets and associated publication information can be viewed at various points in the query process and are downloadable in *.xls format. In the near future, query capability will be expanded to allow users to retrieve data by host rock, geobarometry and geothermometry. Supported by the National Science Foundation