Lab Work: Obtaining Dates of Zircon Crystals

U/Pb dates are being collected from the mass spectrometer. Below are some photos of how the samples are loaded for analysis as well as a photo of the analyzing screen.  After the U and Pb are extracted from column chemistry, it gets dried down and moved into the mass spectrometry lab. A couple drops ofContinue reading “Lab Work: Obtaining Dates of Zircon Crystals”

Lab Work: Extracting U and Pb from Zircon Crystals

One of the primary goals of this project is to date the various small volume eruptions in the Black Rock Desert in conjunction with chemical analyses of the lavas to better understand the processes that control magma evolution. To that end, we are using U/Pb dating and trace element geochemistry of zircon crystals to determineContinue reading “Lab Work: Extracting U and Pb from Zircon Crystals”

Lab Work: Zircon Elemental Chemistry

The zircon mounts are made, polished, and CL imaged. The next step in the process is to get the chemistry of different growth domains. CL images really come in handy for this. You can see in the images below what is called “sector zoning.” It looks like a little bowtie in the zircon. The brighterContinue reading “Lab Work: Zircon Elemental Chemistry”

Lab Work: CL Imaging Zircon Crystals

All of the mounts have been made, polished, and the zircon crystals have been imaged using cathodoluminesce (CL)! The photos below show parts of this process.  Polishing: Similar to how we make thin sections, but all the polishing is done by hand with polishing papers that start around 30 micrometers, which is very coarse forContinue reading “Lab Work: CL Imaging Zircon Crystals”

Lab Work: Mounting Zircon Crystals in Epoxy Part 2

The zircon grain mounts were finally set in epoxy! Here are some photos. You’ll remember from the last update that the zircon crystals are placed on double-sided tape into rows within a 1-cm circle. Once that’s done, a glass ring is placed around the grains and then a plastic ring goes over that. Then theContinue reading “Lab Work: Mounting Zircon Crystals in Epoxy Part 2”

Lab Work: Mounting Zircon Crystals in Epoxy Part 1

Zircon crystals have been picked to put into an epoxy mount! The photo on the left shows the selected zircon crystals in a petri dish of ethanol. This reduces the static and helps see the high relief of zircon which can give the crystals a little bit of glare. Notice that they are kind ofContinue reading “Lab Work: Mounting Zircon Crystals in Epoxy Part 1”