ET_Redux Repository


The documentation below is essentially a set of step by step instructions on how to operate the software. For auditory and visual learners, youtube video tutorials will be included among the written instructions. ET_Redux is sponsored by EARTHTIME and funded in part by the National Science Foundation under Grant Numbers 0930223 and 1443037. Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation (NSF).


GeoPass With ET_Redux

Once you have obtained your SESAR ID you can use this to register a sample. Your sample will be given a unique IGSN number. ET_Redux uses the IGSN as a source for metadata. You can now pull all of the metadata from SESAR to process the sample and ET_Redux can upload the data processing into Geochron - selecting public will make the samples viewable on a map. This functionality will allow samples to be viewable throughout the world.

Getting Your GeoPassId

Visit to start the sign up process. Click on “My Account” to be directed to a login page. If you do not already have an account, click the “Sign up now!” link below the login form. Fill in the necessary fields and press the “Submit Registration” button. You will recieve a confirmation email with a link to confirm your account.

Remember your username and password. This login information will be needed while using ET_Redux.

Running ET_Redux

Double Click Method

Some systems will allow you to run a .jar file with the GUI simply by navigating to the file’s home directory and double clicking it.

From The Command Line

Open your preferred command terminal and navigate to the directory that contains the ET_Redux .jar file. Then run the following command:

$ java -jar ET_Redux<version>.jar

Learn more about using a command line here.

Note: This command should work for all operating systems.

New Project from Raw Data

The following goes through some basic methods and procedures for opening/starting a new project in ET_Redux.

  1. Open ET_Redux - note that this will generate two html files, ChangeLog.html and Credits.html
  2. To start, click “Project” in the top left corner.
  3. Then click “New Project” from Raw Data.
  4. Click “LA-ICP-MS”. Note that IDTIMS raw data is currently processed by our software Tripoli.
  5. Now you will see the Project Manager interface where you specify your project. Start by entering your Project Name and then choosing the appropriate:
    • File Handling Protocol
    • Raw Data Template
    • Analysis Purpose
  6. Finally, click “Prepare to load/Process Raw Data.” Then, depending on your file handling protocol you will be able to select your data file or data folder and then click “Open” to show the parameters manager. If you use folders, be sure that all necessary files are present.
  7. Confirm that all parameters are correct - the defaults are shown initially.
  8. Full Uncertainty propagation is the default - use the fast option to explore datasets only.
  9. Select your Primary Reference Material. Note the default is set in the Lab Settings Manager.
  10. Now you are ready to start the reduction process. You can either start a live session while the mass spectrometer is producing data or proceed to reduce an already-collected dataset as explained below.


Aliquot- phsyical pieces of a sample whose dates you wish to interpret seperately.

Fraction- a paired U+Pb analysis

Live Workflow- establishes a direct link between Tripoli (another CIRDLES software product) and ET_Redux.

Project- collection of samples

Sample- A single collection of a geologic material (usually rock or mineral) from one location. A sample has a lab specific name and a unique identifier such as the IGSN provided by SESAR. It is composed of aliquots or physical pieces of the sample.

Data Reduction- The transformation of information into an ordered, simplified form by reducing it to meaningful parts.

EARTHTIME- An initiative to facilitate cooperation among geochronologists with the goal of sharing ideas and approaches for eliminating or minimizing interlaboratory and intertechnique biases. Read more here.

End-to-end Data Processing- A system that takes a raw data input and transforms it into archived analysis results.

Fractions- A fraction encapsulates the isotopic data for an analyzed volume of a mineral without being lab specific. A fraction is paired U+Pb analysis. For instance, a zircon analyzed by TIMS or a spot zapped by LA-ICPMS would be separate fractions, even if both analyzed the same grain.

GeoChron- A community-based database and World Wide Web portal for data access that serves U-Pb geochronology. It is a joint project of EARTHTIME and EarthChem. Read more here.

IGSN (International Geo Sample Number)- A unique identifier given to a sample.

Metadata- Data about the sample

Sesar (System for Earth Sample Registration)- A centralized registry that provides unique identifiers for samples. Read more here

Uncertainty Propagation- The process of determining the error of a calculation's result.

XML (Extensible Markup Language)- The modeling language CIRDLES uses to model logical data models. XML is an emerging standard for modeling data because it provides for precise declarations of data that are independent of any specific presentation of data, andy software or any specific hardware. The World Wide Web Consortium (W3C) defines XML at