Geochron is a global database that hosts geochronologic and thermochronologic information from detrital minerals. Information included with each sample consists of a table with the essential isotopic information and ages, a table with basic geologic metadata (e.g., location, collector, publication, etc.), a Pb/U Concordia diagram, and a relative age probability diagram. This information can be accessed and viewed with any web browser, and depending on the level of access desired, can be designated as either private or public. Loading information into Geochron requires the use of U-Pb_Redux, a Java-based program that also provides enhanced capabilities for data reduction, plotting, and analysis.
Instructions are provided for three different levels of interaction with Geochron:
1. Accessing samples that are already in the Geochron database.
2. Preparation of information for new samples, and then transfer to Arizona LaserChron Center personnel for uploading to Geochron.
3. Preparation of information and uploading to Geochron using U-Pb_Redux.
Geochron is a project of EarthChem and EARTHTIME. Database development is a collaborative effort of EarthChem (Doug Walker, University of Kansas), CIRDLES (Jim Bowring, College of Charleston), EARTHTIME (Sam Bowring, MIT), and the Arizona LaserChron Center (George Gehrels, University of Arizona). Funding for this initiative is provided by the National Science Foundation (EAR-0929746) and the ExxonMobil
There is a collaboration with the "Working-Group for Geochronology by LA-ICPMS" to provide sets of zircon standards that LA-ICPMS and SIMS labs can use for technique development and interlab calibration tests