Welcome to GeoUnion, the graduate student body of the Department of Earth, Environmental and Planetary Sciences. GeoUnion strives to supplement the overall graduate student experience at Rice and DEEPS. GeoUnion represents DEEPS in the overall Rice grad student community, acts as a liaison between students and faculty and organizes a number of intra- and inter-departmental events throughout the academic year.
|September 6-8||Overnight Camping at San Marcos|
|September 13||Welcome Barbecue|
|Cancelled because of Imelda||Pre-GSA talk|
|October 12-15||Field Trip to Big Bend|
|October 25||Halloween Kickball Tournament|
|November 26||Multicultural Thanksgiving!|
|Dec 6||Pre-AGU practice session|
Here’s a list of the resources that you would need to use frequently as graduate students at Rice. The websites of the Rice Graduate Student Association (GSA), Office of International Students and Scholars (OISS), Graduate and Postdoctoral Studies (GPS) are platforms which graduate students can use to keep track of upcoming events, funding opportunities, changes in rules and regulations, etc.
Living in a vast city like Houston and exploring a new place can also be challenging, and so we have compiled a list of recommendations for housing and fun things to do in the Space City!
How do you get water back into the mantle? Serpentinites, of course! The main source of water in magmatic arcs like the Cascades comes from altered oceanic lithosphere. Interaction of the seafloor results in extensive hydration of the crust and lithospheric mantle, resulting in the conversion of olivine-rich rocks (peridotite) to a green phyllosilicate-bearing rock known as serpentinite. Studying serpentinites is the key to understanding the global water cycle, at least on million year timescales. What were subduction zones like billions of years ago? There are many examples of Phanerozoic serpentinites, but really old serpentinites are rare. It turns out that we have some ancient serpentinites right here in Texas, in the one billion year Grenvillian orogenic belt that cuts across our state.
Green, green olivine
Peridot is when you’re on show.
Drops of water,
Sooner or later,
You become serpentine.
So the Rice Undergraduate Geology Society (RUGS) organized a one day trip out to central Texas today to look at these 1 billion year old serpentinites. We started out at 6 am in the morning and hightailed out to the Coal Creek serpentinite. We met one of our professors Cin-Ty Lee out there – he had arrived several hours earlier to search for a rare Mexican bird called a Striped Sparrow. A couple of faculty from UT Austin also joined us. The day turned out to crystal clear, with mild temperatures. We could not have asked for a better day weather-wise.
We arrived at the serpentinite outcrop. We immediately noticed that the quarried sections were light green, but the weathered surfaces were red, a common feature of ultramafic terranes. There was almost no vegetation growing on the serpentinite surfaces, in stark contrast to the surrounding amphibolite rocks, which had small live oaks growing on them. We spent a couple hours scrambling over the quarry, trying not to roll our ankles, all the while pondering what type of peridotite protolith this was. Was it oceanic lithosphere, fore-arc lithosphere, sub-arc lithosphere, or back-arc lithosphere? How would we tell? Does the serpentinite represent a suture between the collision of two continents? What we all agreed upon was that this serpentinite looked old! No hints of fresh olivine anywhere, but everywhere, there were hints of serpentinizing fluids in the form of syndeformation veins. We also found a couple of local samples that appeared as if they were originally troctolites based on relic cumulate texture.
After having lunch on these green rocks, we decided to head to Enchanted Rock to look at granites up close and personal. Unfortunately, when we arrived, the park had reached its capacity for the day and they were not letting in anymore visitors until 3 PM. So we went back towards where we had just come from and stopped to look at an unconformity where Proterozoic granites and migmatites were overlain by Paleozoic limestones. A hundred million years missing beneath our feet! We spent a half hour crawling over some beautiful exposed migmatites and discussed what conditions are needed to melt the lower crust.
Daylight was running out, so we thought we would take one more shot at getting into Enchanted Rock State Park. We arrived there with only about 2 hours left of sunlight and a long line of cars inching their way through the entrance. We eventually got in with enough time to climb to the top of one of the granite domes. It was a nice way to end the day! Participants (see our group shot above) included from left to right: Elli Ronay, Xun Yu, Detao He (behind Xun), Larisa LaMere, Sriparna Saha, Michael Farner, Lexi Malouta, Rachel Marzen, Jackie Rios, Adeen Denton, Tierra Moore, Emily Paine, and Cin-Ty Lee (taking the picture!).
A new micro-XRF element mapper (Horiba XGT 7000) has been installed on the third floor. This instrument excites atoms using a Rhodium x-ray source and measures the energy of the re-emitted x-rays using energy dispersive spectrometry. This instrument generates qualitative elemental maps at 50 or 100 micron spatial resolution and can handle sample sizes up to 10 x 10 cm. Minimal sample preparation is needed. All that is needed is a relatively flat surface. It can tolerate a few mm of relief so you do not need a polished surface. Come on by if you’re interested in using it. It is easy to learn and use. Undergraduates Emily Paine, Elli Ronay, Meron Fessahaie, Maya Stokes, and Graham Eldridge have already been working on it!
The above image shows a false-color map of a reaction zone in a granite (actually an orbicular granite), measured by Emily Paine. The long dimension is about 4 cm in length. The red corresponds to sulfur and represents sulfides. The green corresponds to Ti and corresponds to Ti-bearing magnetite. You can use this to investigate sediments, metamorphic rocks, igneous rocks, and many other things.
Because of COVID-19, the field trip is being postponed to later (date TBD) this year. The seminar will continue via remote meetings through the end of the Spring 2020 semester.
As earth scientists we seek to understand the natural processes that have shaped the world around us through time. The most fundamental requirement to acquiring a deeper understanding of these mechanisms is through observation. EEPS has a strong heritage in field-based research that when combined with analytical excellence, produces skilled scientists with a broad view of Earth as a system. While Rice University is well placed to take advantage of a broad array of research resources, students in Houston do not always have immediate access to nearby geological sites that represent Earth as a system.
A generous gift from Mike Johnson enables EEPS students the opportunity to observe classic and fundamental geologic concepts in the field. Students are in charge of proposing, selecting and managing a field excursion that will benefit everyone in the department. A year-long seminar-based class run by the students prepares them to visit the locality they have selected. Papers are selected, presented and discussed, followed by activities that educate the students on how to run a field-based project. During the field excursion, elected stops will be led and presented by individual students. The knowledge gained before and during the field trip will cumulate into a multi-media field guide that will be made available to the department and public following the trips conclusion.
A significant benefit of a department-wide field excursion is the interaction of students with scientists from various disciplines. Many earth scientists only carry out field work with specialists in their own field. The real discoveries in modern earth science occur when the different disciplines are part of a collective discourse. This trip will have scientists with different backgrounds observe the same outcrops; fostering fruitful discussion that results in the generation of new and unique questions. In addition, this trip may inspire fellowship among EEPS graduate students that will hopefully create life-long collaborations and a cohesive department.
General route starting in Albuquerque, New Mexico
This year, EEPS elected to utilize Mike Johnson’s gift to lead graduate students on a 7 day field expedition to observe some of the most diverse and economically important geologic terrains in the United States.
In early June of 2020, EEPS will travel through New Mexico, Colorado and Utah, which have easily accessible exposures of metamorphic, sedimentary, and igneous rocks. Starting from Albuquerque, New Mexico they will explore the Rio Grande Rift, the San Juan Volcanic field, and the well exposed Mezozoic stratigraphy on the Colorado Plateau. Observing these diverse geologic terrains will give EEPS graduate students a chance to see how their research interests dovetail with what they observe in nature and provide opportunities to create new ideas.
Pre-Trip planning seminars
Fall semester: The graduate student of the winning field trip proposal organizes a weekly reading group focusing on the regional geology of the four corners region and come up with potential stops.
Spring semester: The weekly reading group continues. Students pick the final outcrops that they would like to visit. Each student is assigned to be an expert on 1-3 stops. Before the field trip, each student will submit their description(s) of their stop for the field guide.
Spring 2020 Seminar Papers
Fall 2019 Seminar Papers
Department of Earth, Environmental and Planetary Sciences
6100 Main Street
Houston, TX 77005 USA