Past Events

  • 2019 Nov 14

    Graduate Student & Post-Doc Seminar

    12:00pm to 1:00pm

    Location: 

    Faculty Lounge, Hoffman 4th floor, 20 Oxford St.

    Speaker: Jonathan Moch

    TItle: "The potential overlooked importance of Hydroxymethanesulfonate as a contribution to ambient particulate matter"

    GSPD comprises scientific talks up to one hour in length by graduate students and post docs, but all are welcome to attend, including faculty and staff. Lunch will be provided. Please bring reusable plates and cutlery to...

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  • 2019 Nov 13

    BiSEPPS Seminar

    12:00pm to 1:00pm

    Location: 

    GeoMus 204 (McKinstry Seminar Room)

    Maxwell Thiemens 

    Title: New insights to lunar formation through Apollo sample analysis

    Abstract: The Moon provides a unique snapshot of the early Earth. Formed from the Earth by a giant impact (or impacts), the Moon has been unaffected by the large-scale reworking the Earth experiences. Analyzing a suite of samples from the Apollo missions for Hf and W provides information on the Moon's formation 4.51 billion years ago (around 50 million years after solar system formation), as well as its subsequent evolution. This can, in turn,...

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  • 2019 Nov 12

    EHAP Seminar

    1:00pm

    Location: 

    Geology Museum 102 (Haller Hall)

    Tristan Horner
    Assistant Scientist
    Marine Chemistry & Geochemistry
    Woods Hole Oceanographic Institution

    Isotopic insights into the drivers of marine barium cycling

    Barium is widely used as an oceanographic proxy for deep ocean nutrients, ocean circulation, alkalinity, carbon export, surface runoff, and historical upwelling intensity. While this breadth perhaps reflects the unparalleled utility of barium-based proxies to reconstruct all aspects of ocean chemistry, it is also a sign of potentially misidentified driving processes. Development of the barium isotope ‘toolbox’ now permits testing several of the proposed drivers. I will apply this toolbox for precisely this purpose, and will present results spanning several scales: from the basin-scale processes sustaining oceanographic barium distributions, to the micro-scale mechanisms of barium isotope fractionation during mineral precipitation. Emerging results indicate that the mineral barite is the critical driver of marine barium cycling, a result that I will explore in the context of using barium-based proxies for reconstructing ocean chemistry.

     

    The Earth History and Paleobiology (EHAP) Seminar Series is jointly hosted by OEB and EPS.

  • 2019 Nov 07

    Graduate Student & Post-Doc Seminar

    12:00pm to 1:00pm

    Location: 

    Faculty Lounge, Hoffman 4th floor, 20 Oxford St.

    Speaker: Yang Li, post-doc in the Jacob Group

    TItle: Wildfire in the Western U.S.: Now and in the Future

    GSPD comprises scientific talks up to one hour in length by graduate students and post docs, but all are welcome to attend, including faculty and staff. Lunch will be provided. Please bring reusable plates and cutlery to reduce waste.

    ...
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  • 2019 Nov 06

    BiSEPPS Seminar

    12:00pm to 1:00pm

    Location: 

    GeoMus 204 (McKinstry Seminar Room)

    Magali Billen, UC Davis

    Episodic Plate Motion and Thermal Structure in Subduction Zones Caused by Slab Folding in the Transition Zone

    Abstract: Although most present-day subduction zones are in trench retreat, plate reconstructions and geological observations show that individual margins experience episodes of advancing, retreating or stationary trench motion with time-variable subduction rates. However, most laboratory and numerical simulations predict steady plate velocities and sustained trench retreat unless the slab experiences folding in the...

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