Hey, not to twist anyone's undergarments in a bunch, but what's with this term "Petrochronology"?
The earliest reference I can find to it is from 1969 in anthropology, in regards to a Yoruba (Nigeria) river god cult as a way of dating duration and intensity of devotion. Basically the number of rocks in a pot indicates how long (and devoted) you've been.
In geology die Fraser et al. (1997) first propose it? Martin Engi certainly popularized it in a 2009 abstract.
What I don't get is that "Petrochronology" literally means dating of stones. How is that substantively different from "Geochronology," which means the dating of Earth (materials)?
I think John's session description below and Martin's 2009 abstract ultimately propose that petrochronology is different from geochronology by virtue of petrologic and geochemical context - textures, trace element chemistry, etc. But who would _ever_ employ, say, metamorphic geochronology _without_ that context? That is, metamorphic (and igneous) geochronology IS (or should be) petrochronology anyway.
I know the term is catching on, but it really does seem redundant to me.
Matt
On Jun 19, 2013, at 8:10 AM, John Cottle wrote:
> We invite contributions to session T157 and participation in our short-course at the upcoming 125th Anniversary GSA Annual meeting, which takes place in Denver, October 27-30, 2013
>
> Session T157: Frontiers in Petrochronology
>
> Conveners: John Cottle, Andrew Kylander-Clark
>
> Petrochronology is the interpretation of isotopic dates in the light of complementary geochemical/textural information gleaned from the same mineral(s). Continued advancements in geochronologic measurement techniques have increased the precision and accuracy with which individual dates can be measured. Geologic "events," once considered as having occurred at a single point in time, are now commonly recognized as a series of processes that occurred over a period of time, whether it be a few kyr or several Myr. Thus, as geochronologic precision and accuracy increase, so must the accompanying textural and chemical information that allows one to match a measured date to a specific geologic process, whether it be melt crystallization, or responses to changes in pressure, temperature, and/or fluid/melt infiltration, with or without accompanying deformation. This session aims to both highlight the array of emerging analytical techniques, as well as the application of these methods to provide insight into a range of tectonic and geochemical processes.
>
> Invited Speakers:
>
> - Julia Baldwin (University of Montana)
> - Nigel Kelly (Colorado School of Mines)
> - Mark Schmitz (Boise State)
>
> Abstract deadline is 6th August 2013 at 23:59 (Pacific Time)
>
> We look forward to seeing you in Denver!
>
> John and Andrew
>
> --
>
>
> *************************************
> John Cottle
> Associate Professor
> Department of Earth Science
> & Earth Research Institute
> University of California, Santa Barbara CA 93106-9630
> Tel: +1 805-893-7315
> Email: [log in to unmask]
> Web: http://www.geol.ucsb.edu/faculty/cottle
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Dr. Matthew J. Kohn, Professor
Department of Geosciences
Boise State University
1910 University Dr.; MS1535
Boise, ID 83725-1535
[log in to unmask]
http://earth.boisestate.edu/mattkohn/
phone: (208)-426-2757 fax: (208)-426-4061
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