In her lecture Miller broke down the geological history of Washington into a series of events, which define the physiographic provinces of the state, because it is the bedrock of a region that influences the outward appearance. In her opening remarks, she said that her favorite thing to say about writing these (roadside geology) books is that she learns so much. Darrel Cowan of the University of Washington, whose experience and perspective in understanding the geological framework of the state was invaluable. Miller co-wrote the book with her former PhD. Marli Miller to speak to the society about her latest book, Roadside Geology of Washington Second Edition. GSOC members were delighted to welcome back Dr. Marli Miller, Department of Earth Sciences, University of Oregon and her book co-authored with Dr. Read More →īased on the Februlecture by Dr. (Recall that in the October 2020 article the term fractionation was described as a process of concentrating certain types of matter, in this case isotopes, in response to a phase change.) Instead, I will discuss in qualitative terms the principals that dictate how stable isotopes of oxygen distribute themselves in the rocks of the earth, and the resulting ranges of the isotopic ratios one expects to find in the rocks of the world. This article is not intended as a mathematical derivation of the equations used in isotope fractionation studies. These types of analyses are commonly used in many aspects of geological research and the reader will undoubtedly run across them in academic papers.
I will in this article explore the distribution of oxygen isotopes in rocks of the earth. This is a sort of shell game using stable isotopes of oxygen and how they are preferentially distributed in the waters of the earth. In the last article from October 2020, “Oxygen Isotope Analysis in Paleoclimatology,” I addressed an aspect of the geochemistry of the ocean and meteoric water on earth (meteoric water being rainwater, snow, water vapor in clouds, etc.) in the form of oxygen isotope distribution. The geochemistry of rocks is a study that brings many great tools to the geologist’s tool chest.
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