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Department of Earth Sciences

 
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A collection of all the seminars going on at the Department, either on the downtown site, or out at the Bullard Laboratories
Updated: 1 hour 1 min ago

Thu 04 Feb 15:00: Paleocene–Eocene climate and carbon cycle: tales from the 'boring background'

Tue, 26/01/2021 - 12:42
Paleocene–Eocene climate and carbon cycle: tales from the 'boring background'

The Paleocene and Eocene Epochs (~66–34 Ma) were important greenhouse periods, characterised by high frequency orbitally-paced events (e.g., hyperthermals) superimposed on long term changes in climate and the carbon cycle. Major changes in the marine and terrestrial biosphere also occurred at this time, synchronous with both high frequency and long-term changes in climate. While many detailed palaeoclimate records have been generated for the enigmatic hyperthermals, such as the Paleocene Eocene Thermal Maximum (PETM), the general background climate of this period has only been reconstructed at a much lower resolution. This poorly characterised ‘boring background’ hampers our understanding both of the overall climate state of this greenhouse world and the hyperthermals themselves. Here I’ll talk through some new data from the ancient Atlantic and Indian Oceans which help to better characterise background climate and carbon-cycle of the Palaeocene–Eocene.

Three supporting papers:

https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019PA003556

https://www.sciencedirect.com/science/article/pii/S0012821X20303587

https://science.sciencemag.org/content/369/6509/1383.abstract?casa_token=0BWfLrOWyjgAAAAA:AHypTjer434afTBpW43UNHxIH5lALOtLKGbNWpMUugHl3l1L8IbeTuEAKlVhkUrl5_79yL4KtIlZxEw

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Thu 25 Mar 15:00: Title to be confirmed

Sat, 23/01/2021 - 13:36
Title to be confirmed

Abstract not available

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Thu 28 Jan 15:00: Psyche: Journey to a Metallic World

Sat, 23/01/2021 - 13:35
Psyche: Journey to a Metallic World

“Psyche” is both the name of an asteroid in the main belt, orbiting out past Mars, and the name of our mission to visit that asteroid. Psyche’s density, radar, and reflected light properties indicate that it is largely made of metal. Humans have never visited a world made of metal. So if Psyche turns out to be what we think, we’ll be visiting a new kind of world.

Our spacecraft will launch in August 2022 – just 19 months away! – and in 2026 will begin orbiting Psyche and performing carefully planned scientific measurements. In this talk we’ll discuss the state of the mission and our plans, and, especially, what we each are doing on the mission and how we got here.

Psyche will surprise us. The universe always outsteps even our best imaginations. And our whole Psyche team looks forward to sharing all we discover with everyone here on Earth.

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Mon 01 Feb 17:00: Improving EDI in academic and field settings

Fri, 22/01/2021 - 16:38
Improving EDI in academic and field settings

An audit for action: strategies for change

2020 saw the geosciences community reaffirm its commitment to the development of a fairer and more equal field, especially in terms of racial equality. However, developing strategies to address the challenges of poor representation can be challenging, especially if we wish to do this in a way that does not further burden minority groups to make the changes we wish to see. Here, I will present a potential strategy for identifying barriers to inclusion and retention within academic geoscience settings, based upon work first undertaken in the Department of Earth Sciences at the University of Oxford, and now being expanded across other departments in the UK. Finally, this work will discuss how similar strategies may be replicated (or preferably improved!) at other institutions, recognising that this is only one possible avenue to achieving change.

Happy Campers; perspectives on equality, diversity and inclusivity in geoscience fieldwork

Due to the unprecedented COVID -19 pandemic and growing awareness of the need for improved equality, diversity and inclusivity in the geosciences, the role of fieldwork has increasingly been called into question in recent literature and social media. In this contribution, drawing on my own experiences of working in the Highlands of Scotland, I describe how in the right place, with supportive people, adequate provisions and thorough planning, fieldwork can be accessible, inclusive and truly rewarding.

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Mon 22 Feb 17:00: Title TBC

Thu, 21/01/2021 - 16:46
Title TBC

Abstract not available

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Mon 01 Feb 17:00: Happy Campers; perspectives on equality, diversity and inclusivity in geoscience fieldwork

Thu, 21/01/2021 - 16:45
Happy Campers; perspectives on equality, diversity and inclusivity in geoscience fieldwork

Due to the unprecedented COVID -19 pandemic and growing awareness of the need for improved equality, diversity and inclusivity in the geosciences, the role of fieldwork has increasingly been called into question in recent literature and social media. In this contribution, we recount our own experiences of fieldwork in Wyoming, USA and the Highlands of Scotland and the barriers we faced and subsequently overcame. We describe how in the right place, with supportive people, adequate provisions and thorough planning, fieldwork can be an accessible, inclusive and truly rewarding experience.

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Mon 25 Jan 17:00: Geodynamic of rifted margins: pre-rift inheritance and post-rift movements

Thu, 21/01/2021 - 16:45
Geodynamic of rifted margins: pre-rift inheritance and post-rift movements

Rifted margins host the Earth’s largest sedimentary basins, which contain important ore deposits and energy (hydrocarbon and thermal) resources and could play a pivotal role in the energy transition as ideal locations for carbon sequestration, energy and nuclear waste storage. In addition, their thick sedimentary cover constitutes a unique archive of global climate changes throughout Earth’s history and a valuable record of the dynamic processes controlling lithospheric deformation. Rifted margins form by continental rifting and the subsequent lithospheric breakup and oceanic spreading. Several key parameters influence continental rifting and the final geometry of rifted margins, including lithosphere composition and thermal state (i.e., rheology), spatial and temporal distribution of strain rate, mantle dynamics, magmatism, and surface processes (i.e., erosion and sedimentation rates). In this seminar, I will examine the role of lithosphere rheology in influencing the tectonics of continental rifting, using the Labrador Sea as a case study. I will also touch on the post-breakup life of the Atlantic NW African margin, where some intriguing post-rift vertical movements have been documented.

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Mon 22 Feb 18:00: Title TBC

Thu, 21/01/2021 - 16:27
Title TBC

Abstract not available

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Mon 25 Jan 18:00: Geodynamic of rifted margins: pre-rift inheritance and post-rift movements

Wed, 20/01/2021 - 22:10
Geodynamic of rifted margins: pre-rift inheritance and post-rift movements

Rifted margins host the Earth’s largest sedimentary basins, which contain important ore deposits and energy (hydrocarbon and thermal) resources and could play a pivotal role in the energy transition as ideal locations for carbon sequestration, energy and nuclear waste storage. In addition, their thick sedimentary cover constitutes a unique archive of global climate changes throughout Earth’s history and a valuable record of the dynamic processes controlling lithospheric deformation. Rifted margins form by continental rifting and the subsequent lithospheric breakup and oceanic spreading. Several key parameters influence continental rifting and the final geometry of rifted margins, including lithosphere composition and thermal state (i.e., rheology), spatial and temporal distribution of strain rate, mantle dynamics, magmatism, and surface processes (i.e., erosion and sedimentation rates). In this seminar, I will examine the role of lithosphere rheology in influencing the tectonics of continental rifting, using the Labrador Sea as a case study. I will also touch on the post-breakup life of the Atlantic NW African margin, where some intriguing post-rift vertical movements have been documented.

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Wed 27 Jan 16:00: A trans-disciplinary and community-driven database to unravel subduction zone initiation

Wed, 20/01/2021 - 12:36
A trans-disciplinary and community-driven database to unravel subduction zone initiation

Subduction zones are pivotal for the recycling of Earth’s outer layer into its interior. However, the conditions under which new subduction zones initiate are enigmatic. I will provide an overview over a transdisciplinary database featuring detailed analysis of more than a dozen documented subduction zone initiation events from the last hundred million years. The initial findings reveal that horizontally forced subduction zone initiation is dominant over the last 100 Ma, and that most initiation events are proximal to pre-existing subduction zones. The SZI Database is expandable to facilitate access to the most current understanding of subduction zone initiation as research progresses, providing a community platform that establishes a common language to sharpen discussion across the Earth Science community.

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Thu 18 Mar 15:00: Title to be confirmed

Mon, 18/01/2021 - 10:11
Title to be confirmed

Abstract not available

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