An article by Suzanne Birner, Jessica Warren, Liz Cottrell, and Fred Davis has been published in the July issue of the journal Geology. This article is available online via open access. In the Pacific Ocean, north of New Zealand, the collision of two tectonic plates has created the Tonga Trench, a massive gash in the […]
Mantle anisotropic viscosity results from the crystallographic alignment of olivine and influences a variety of large-scale geodynamic processes. This study, lead by Lars Hansen, presents torsion and extension experiments on pre-textured olivine aggregates to provide constraints on olivine viscous anisotropy. We found that the magnitude of anisotropy is similar among the different deformation geometries tested. […]
Megan D’Errico successfully defended her PhD thesis at Stanford University. Megan’s thesis is titled:Â Heterogeneity and Depletion of the Mantle Assessed from Abyssal Peridotite Geochemistry. Congratulations Megan!
This review article presents a global compilation of abyssal peridotite compositions, demonstrating that their compositions reflect a combination of melting, melt-rock interaction and source heterogeneity. This article is open access. Warren, J.M., 2016. Global variations in abyssal peridotite compositions, Lithos, 248-251, 193-219, doi:10.1016/j.lithos.2015.12.023.
Megan D’Errico’s paper on the geochemistry of peridotites from the Arctic Ocean has been published in Geochimica et Cosmochimica Acta. Based on modeling of peridotite compositions, we show that the presence of refractory harzburgites and thin overlying oceanic crust are best explained by low degrees of melting of a previously melted, heterogeneous mantle. D’Errico, M.E., […]
This review article on Re-Os-Pb isotopes in mantle sulfides has been published following the Reviews in Mineralogy and Geochemistry short course on Highly Siderophile and Strongly Chalcophile Elements. This article is open access. Harvey, J., J.M. Warren and S.B. Shirey, 2016. Mantle sulfides and their role in Re-Os-Pb isotope geochronology, Reviews in Mineralogy and Geochemistry, […]
The Mantle Processes Group has moved to the Department of Geological Sciences in the College of Earth, Ocean and Environment at the University of Delaware. Positions are available for students and postdocs. Contact Jessica Warren (warrenj at udel dot edu) for more information.
We returned to the Josephine Peridotite for more sampling of mantle shear zones. In addition to graduate students Nik Deems and Katie Kumamoto, Stanford undergraduate EKela Autry joined us to get data for her summer project. We were also joined by Eric Mittelstaedt and Kate Kaminski from the University of Idaho for Kate’s project on […]
Arjun Kohli successfully defended his thesis, “Micromechanical Controls on Brittle to Plastic Fault Zone Deformation”. Congratulations Dr. Kohli!
Josie Nevitt successfully defended her PhD thesis, “Fault-Related Deformation Within the Brittle-Ductile Transition: Field Observations, Microsctructural Analysis and Mechanical Modeling”. Congratulations Dr. Nevitt!