Back to Back Seminars on Chondrites

Next week, on Tuesday, October 8th, I’ll be presenting a Seminar to USGS about radiometric dating of chondritic material.  If you can’t make it to that date, I’ll be presenting the same Seminar on Wednesday, November 13th at Stanford.  Please stop on by! Details below:


The first 20 million years: Using geochronology of chondrites to probe the earliest Solar System processes


Nearly 4.6 billion years ago, our sun was born – But what happened next?  To unravel the geologic history of the early Solar System, we turn to materials captured in chondrites. Chondrites are a type of meteorite composed of undifferentiated material assembled within a few million years after the birth of the sun. They preserve a record of the earliest geologic processes, from formation of the first solids in the solar disk, to the onset of secondary processing on asteroidal parent bodies. This talk will review some of the radiochronometers that are used for dating chondrites and their components, including long-lived and short-lived systems for dating primary components (such as Pb-Pb and Al-Mg), and will detail recent work using the Mn-Cr system for determining the timing of aqueous alteration on primitive asteroids. Recent developments in instrumental techniques and analytical procedures for radiometric dating have led to determination of high-precision ages that can resolve distinct cosmochemical events. This seminar will cover how these precise ages have changed our interpretation of mechanisms driving geologic processing in the early Solar System.


Seminar #1 :  10/08/2019, 11:00am – 12:00pm

USGS Rambo Auditorium (Building 3, room 3240),  345 Middlefield Road, Menlo Park, California

Seminar #2:  11/13/2019, 12:30 – 1:20pm

Stanford, Braun 220



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