The 996th meeting of 

The Mineralogical Society


Southern California



Mineralogy and Fluid-Rock Reactions in the Ocean Crust

Presented by Dr. Rebecca Greenberger


Friday, December 10, 2021 at  7:30.

See program notes below

Visitors are always welcome

About us…

The MSSC is a member of the California Federation of Mineralogical Societies and is dedicated to the dissemination of general knowledge of the mineralogical and related earth sciences through the study of mineral specimens.  We are a scientific non-profit organization that actively supports those endeavors through public outreach, field study and related programs.

For more information

Program Notes: Join us Friday, December 10 at 7:30 PM for a presentation by Dr. Rebecca Greenberger: Mineralogy and Fluid-Rock Reactions in the Ocean Crust

Summary: The majority of Earth’s crust is ocean crust, yet we do not fully understand how it forms, cools, and alters through interaction with water. A key challenge is accessing the ocean crust. We can directly sample this crust through ocean drilling, which is technologically challenging. We have not yet recovered a continuous sample of the ocean crust from the lavas near the ocean floor to the lower crust kilometers below. Ophiolites, where the ocean crust and upper mantle have been tectonically thrust onto continents, provide more accessible sites to study the ocean crust. The International Continental Scientific Drilling Program’s Oman Drilling Project recovered 3.2 km of drill core through the ocean crust and upper mantle of the Samail Ophiolite, Oman. We scanned all core with an imaging spectrometer at a spatial resolution of approximately 250 micrometers/pixel. This technique measures how light reflects off materials from the visible light that our eyes see into the infrared, and the way that light is absorbed at different wavelengths allows us to pinpoint the minerals present. Using the billions of measurements of mineralogy in this data set, we are beginning to understand the temperatures and chemistries of fluids altering the ocean crust and the broader composition of the crust in unprecedented detail.

Bio: Dr. Rebecca Greenberger is currently a Lab Manager and Research Scientist at Caltech. In her research, she uses imaging spectroscopy in the field and laboratory to understand geological processes on Earth and elsewhere in the Solar System. She has done fieldwork across four continents, including meteorite impact craters in the Canadian High Arctic and Germany, the mountains of Oman, and most recently dust source regions in Morocco and Iceland. Rebecca received an AB in Earth and Planetary Sciences at Washington University in St. Louis and ScM and PhD in Geological Sciences at Brown University. She also completed a NASA Postdoctoral Fellowship at the Jet Propulsion Laboratory.


Effective April, 21, 2021

Paid MSSC members will be automatically on the invite list each month.

For Non Members:

You must request to attend the MSSC zoom meeting every month. See below for details.

Participants who want to do this must respond to our Programs chair, Rudy Lopez at  no later than Tuesday December 7, 2021.  Please include “December  ZOOM Meeting” in the subject line of your response. This response date will allow time for us to send you the information needed to participate in the ZOOM meeting.

Upcoming Events

  • January 14, 2022: Denise Nelson: “Forbidden Zone” ZOOM

  • February 11, 2022: Miko: A brief Introduction to Indonesian Gemstones ZOOM

  • January 16, 2022: MSSC Board Meeting ZOOM

The MSSC is pleased to offer the new 2020 edition of Bob Pedersen’s X- Dana 

X-Dana Mineral Spreadsheet