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Geoinformatics for Geochemistry
Paper #: 126
EarthChem’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: [email protected] (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: [email protected]
Southwestern US xenolith locations (courtesy M. Ducea)
Plotted on GeoMapApp free downloadable software (www.geomapapp.org)
QUERY
The database contains major
oxide, trace element and
isotopic compositional data for
minerals and rocks.
SELECT DATA
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.
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
VIEW and DOWNLOAD
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.