Paper No. 352-1
Presentation Time: 9:00 AM-6:30 PM
EARTHTIME 2.0, ACCELERATING THE DEVELOPMENT AND APPLICATION OF INTEGRATED METHODOLOGIES FOR THE QUANTIFICATION OF GEOLOGICAL TIME
CONDON, Daniel, NERC Isotope Geoscience Laboratory, British Geological Survey, Keyworth, Nottingham, NG12 5GG, United Kingdom, KUIPER, Klaudia, Faculty of Earth and Life Sciences, Vrije Universiteit, 1085 De Boelelaan, Amsterdam, 1081 HV, Netherlands, MORGAN, Leah E., U.S. Geological Survey, Central Mineral and Environmental Resources Science Center, Box 25046 Denver Federal Center, MS-973, Denver, CO 80225, RENNE, Paul R., Berkeley Geochronology Center, 2455 Ridge Rd., Berkeley, CA 94709, SCHMITZ, Mark D., Department of Geosciences, Boise State University, 1910 University Drive, Boise, ID 83725-1535, SCHOENE, Blair, Department of Geosciences, Princeton University, Guyot Hall, Princeton, NJ 08544 and SINGER, Bradley S., Department of Geoscience, University of Wisconsin, 1215 W. Dayton St., Madison, WI 53706, dcondon@bgs.ac.uk
The EARTHTIME Initiative has been active since the inaugural workshop in 2003. The first phase (EARTHTIME 1.0, 2004 to ~2016) was focussed on addressing shortcomings in the ‘high-precision’ geochronometers (e.g., U-Pb and
40Ar-
39Ar), issues that limit their widespread application at the quoted levels of precision/accuracy. Many of these shortcomings (e.g., inter-laboratory bias) have been addressed through experiments conducted over the past ~12 years and the accuracy and precision of both of these widely used dating systems has been significantly improved. Perhaps the most significant outcome has been the development of a strong and lasting sense of a geochronology community. Not only has this community brought the
40Ar-
39Ar and U-Pb isotope dilution sides together (for experiments and application) but it has expanded to include a wider range of decay schemes (e.g., Re-Os and U-Th) and analytical approaches (e.g., microbeam U-Pb).
The motivation for accelerating progress in the various dating methods has been that they underpin a wide range of Earth science research areas. The initiation of the EARTHTIME Initiative was driven by a combined need from within the geochronology community, but also from those reliant branches of Earth sciences. High-precision methods and chronology of the stratigraphic record was a focus at the start, however as EARTHTIME has evolved this delineation of what EARTHTIME is about has moved, with the emphasis on improving methods and application, irrespective of the level of precision. In 2016 two workshops were held to discuss and plan the future of the EARTHTIME Initiative. An outcome of the workshops was a broad definition of the EARTHTIME mission: To accelerate the development and application of integrated methodologies for the quantification of geological time for the underpinning of Earth sciences. A new structure is being developed and a revised web site is being developed: www.earth-time.org to communicate this.
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