2 Result(s)

Investigating an impact origin for Hadean zircons from Western Australia

Hadean zircons, found in the Jack Hills, Western Australia, are the oldest known materials on Earth, dating back to nearly 4.4 Ga or only ~150 Ma after formation. These tiny grains have been essential in transforming our view of the Hadean from a hot, hellish environment to one that appears much more hospitable to life with continental crust, water, and possibly even plate tectonics. Understanding the magmatic environment that leads to the formation of these ancient grains is fundamental to interpreting the geochemical signatures within them. Hypothesis of formation environments have ranged from plate boundary interactions to impact melt sheets. One important characteristic of the Jack Hills zircons is their unique inclusion assemblage,...

Required Availability
Spring 2017
Course Credit?
Yes - Geo 399/499
Paid Position?
No
Preferred Majors
Chemistry | Geography | Geology
Keywords
Hadean | Zircon | Geochemistry | early Earth | impacts

Reconstructing paleoclimate in the Late Cretaceous

One of my field areas is in the Hell Creek are of central-eastern Montana which contains rocks that preserve the Cretaceous - Paleogene (K-Pg) boundary, which is the interval where dinosaurs (and many other organisms) went extinct. I have two projects related to samples I've collected from the area: 1. I'm trying to reconstruct climatic conditions in the latest Cretaceous using geochemical tests of fossil mussel shells and descriptions of rock types. This work will help us understand what environments fossils are preserved in, and the hydrology of the area during the Cretaceous. 2. I've also collected samples at high resolution across the K-Pg for chemical tests of the sediment. This will help us locate the K-Pg boundary precisely, assess...

Required Availability
Fall 2017 | Spring 2018 | Summer 2018
Course Credit?
Yes - GEO 399/499
Paid Position?
No