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Summer Student Fellow (SSF) Program

This year, Postodoctoral investigator Rellie Goddard, Andy Cross, and myself have the pleasure to host undergraduate student Namitha Kumar from the University of Michigan as part of the prestigious SSF program at WHOI. Namitha will work on combining geochemical analyses by LA-ICP-MS and electron microprobe with rheological measurements by EBSD on gabbros from the South…

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May 2022 – New Paper in Nature Geoscience: High water content of arc magmas recorded in cumulates from subduction zone lower crust

Magmatic volatiles (for example, water) are abundant in arc melts and exert fundamental controls on magma evolution, eruption dynamics and the formation of economic ore deposits. To constrain the H2O content of arc magmas, most studies have relied on measuring extrusive products and mineral-hosted melt inclusions. However, these methods have inherent limitations that obfuscate the…

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June 2021 – New Paper in Science Advances: Postmelting hydrogen enrichment in the oceanic lithosphere

Graph

The large range of H2O contents recorded in minerals from exhumed mantle rocks has been challenging to interpret, as it often records a combination of melting, metasomatism, and diffusional processes in spatially isolated samples. Here, we determine the temporal variations of H2O contents in pyroxenes from a 24-Ma time series of abyssal peridotites exposed along…

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March 2020 – New Paper in Geology: Quantifying the volume increase and chemical exchange during serpentinization

Quantifying the volume increase and chemical exchange during serpentinization

Quantifying the concurrent changes in rock volume and fluid composition during serpentinization remains a major challenge in assessing its physicochemical  effects during continental rifting, seafloor spreading, and subduction. Here we conducted a series of 11 hydrothermal laboratory experiments where cylindrical cores of natural dunite, harzburgite, and pyroxenite were reacted with an aqueous solution at 300…

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March 2020 – New paper in American Mineralogist: The distribution and abundances of halogens in subducted eclogites

The distribution and abundances of halogens in subducted eclogites

Ben Urann (PhD student in Le Roux’s group) just published his work on halogen cycling in subduction zones! We present in situ secondary ion mass spectrometry (SIMS) and electron microprobe analyses of coexisting garnet, omphacite, phengite, amphibole, and apatite, combined with pyrohydrolysis bulk-rock analyses to constrain the distribution, abundance, and behavior of halogens (F and…

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September 2019 – New paper in Minerals: Connecting timing of boninite percolation and pyroxenite formation in subduction mantle

Rocks

The peridotite section of supra-subduction zone ophiolites is often crosscut by pyroxenite veins, reflecting the variety of melts that percolate through the mantle wedge, react, and eventually crystallize in the shallow lithospheric mantle. Understanding the nature of parental melts and the timing of formation of these pyroxenites provides unique constraints on melt infiltration processes that…

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