Geological Society of America (GSA) Southeastern Section Meeting

Date: Wednesday, March 19, 2025 — Friday, March 21, 2025

Web: https://www.geosociety.org/GSA/Events/Section_Meetings/GSA/Sections/se/2025mtg/home.aspx?hkey=88411fd7-3278-41be-aa78-f451032e17f3

Includes the following sessions:

T19. Co-evolution of life and its environment: from biodiversification events to mass extinction and everything in between

Convenors: Yoseph Adiatma ([email protected]), Jay Goodin ([email protected]), Amy Hagen ([email protected]), Maya Roselli ([email protected]), Gwen Barnes ([email protected]), Nathaniel Evenson ([email protected])

This session will explore evolutionary, ecological, and environmental changes throughout the Phanerozoic, emphasizing multidisciplinary approaches that aim to develop new perspectives concerning links between long-term environmental variation and biotic turnover.

Geological Association of Canada/Mineralogical Association of Canada/International Association of Hydrogeologists — Canadian National Chapter (GAC-MAC-IAH-CNC) Joint Annual Meeting

Date: Sunday, May 11, 2025 — Wednesday, May 14, 2025

Web: https://event.fourwaves.com/ottawa2025/pages

Includes the following sessions:

Mafic intrusions, associated magmatism and metallogenesis in anorogenic settings

Convenors: Steven Denyszyn ([email protected]), Stephen Prevec ([email protected]), Gregory Shellnutt ([email protected])

The emplacement of mafic and ultramafic magmas into the crust at anorogenic settings throughout geologic time has contributed to crustal growth, crustal recycling, and continental breakup. Anorogenic mafic rocks, such as those comprising layered mafic intrusions and associated anorthosites, also host most of the world’s magmatic sulphide-hosted ore deposits of Ni, Cu, PGE, Cr and related metals, while associated granitoids host small but economically significant ore deposits (including critical metals). Large Igneous Provinces are also sites of significant ore-bearing intrusive suites, including layered intrusions and ferroan (A-type) granitoids. The roles of magma mixing and contamination, decompression, oxygen fugacity and immiscibility have all been critically re-examined in recent decades in these contexts. This session will focus on constraining the tectonomagmatic processes that contribute to the formation of intraplate rock suites, including but not limited to continental flood basalt provinces, related subvolcanic intrusions, A-type granites, and giant radiating mafic dyke swarms and their related metal ores. It is aimed at geochemists, petrologists, geologists, tectonophysicists and numerical modelers interested in the relationship between geodynamics, magma genesis and mineralization.

New perspectives on abrupt environmental change in deep time

Convenors: Ricardo Silva ([email protected]), Alina Shchepetkina ([email protected]), Stephanile Erhunmwunsee, Matt Braun ([email protected]), Elisabeth Steel ([email protected])

Surface environments and biosphere have been in constant turmoil since life emerged on Earth. The study of abrupt environmental, climatic, and biogeochemical changes recorded in Earth’s geological history is complex. Although there are still considerable areas for improvement in our

understanding of these critical events, progress has been made in uncovering some of the processes and feedback between the various Earth system components during these geological intervals. By unravelling these complex relationships, we gain a better understanding of how the Earth operates as an integrated system and add valuable insights into the future evolution of our planet. We look forward to receiving your contributions towards researching these critical events, such as the Great Oxidation Event, early global glaciations, oceanic anoxic events (OAE’s), hyperthermals, the end

Permian and K/Pg extinctions, Paleocene–Eocene Thermal Maximum, Eocene-Oligocene climate Transition (EOT), Middle Miocene Climatic Optimum, etc. Additionally, insights into environment-biological interactions during periods of rapid transformation in the Phanerozoic are greatly appreciated.

Palaeogeography and geodynamics of the Earth before Pangea: celebrating the career accomplishments of Kenneth L Buchan

Convenors: Phil McCausland ([email protected]), Wouter Bleeker ([email protected]), Mike Hamilton ([email protected]), Richard Ernst ([email protected]), Hafida El Bilali ([email protected]), Joe Hodych ([email protected]), Henry Halls ([email protected])

We invite contributions along the theme of understanding the paleogeography and geodynamics of the Precambrian and Paleozoic Earth before Pangea, from local to planetary scale. Submissions of new results as well as syntheses are welcome, including (but not limited to) the reporting and use of paleomagnetic, geochronologic, geochemical, geophysical and remote sensing data to provide more precise spatiotemporal constraints on the evolving relationships between cratons, terranes and supercontinents. This session is convened in honour of the career accomplishments of Kenneth L. Buchan, a pioneer in precise field-and lab-based paleomagnetic work and a mentor and leader in using integrated paleomagnetism, geochronology and allied techniques on redbeds, flows, dykes and sills to investigate: the transport of Iapetan terranes, the relative motions between Precambrian cratons, the assembly of supercontinents and the extent and geodynamic implications of large igneous provinces on terrestrial planets.

Magmatic ore deposits associated with mafic-ultramafic systems: a tribute to the career of Prof. C Michael Lesher

Convenors: Michel Houle ([email protected]), Anne-Aurelie Sappin ([email protected]), Benoit Saumur ([email protected])

Nickel, copper and platinum-group elements have been an important part of the Canadian economy ever since the Sudbury District was first mined in the late 19th century. With the energy transition taking place in Canada and elsewhere in the world, there is a renewed interest in these and other elements, many of which (Ni, Cu, Co, PGE, Cr, Ti, V, and P) are now considered critical to this transition and are being recovered predominantly from various deposit types associated with magmatic mafic-ultramafic mineral systems. This special session is seeking to address key processes involved in the genesis of economic accumulation of these critical minerals, and advances in exploring for them, within established and emerging mining camps but also in frontier regions in Canada and elsewhere around the world. This session is dedicated to the career of Professor Emeritus C. Michael Lesher (Laurentian University, Sudbury), who has made a significant contribution to our understanding of these well-endowed mineralized systems in the Canadian context, but also worldwide

International Association of Volcanology and Chemistry of the Earth’s Interior (IAVCEI) Scientific Assembly

Date: Sunday, June 29, 2025 — Friday, July 4, 2025

Web: https://sa2025.iavceivolcano.org/

Includes the following themes:

Production of magma and assembly of volcanic plumbing systems

Theme leaders: Catherine Annen ([email protected]), Olivier Namur ([email protected]), Chris Huber ([email protected])

Volcanoes are fed by magmas that are sourced at depth by partial melting of the mantle and/or partial melting of the crust. Determining the composition and mineralogy of the sources as well as the respective contribution of juvenile and crustal components remain important challenges to our understanding of the petrogenesis of magmas. Before reaching the Earth’s surface, magmas are transferred through a network of reservoirs, sills, and dykes, where they are subjected to a range of processes including mixing, mingling, contamination, fractionation. As magmas stall in the crust, their dynamics and evolution strongly depend on their physical state; i.e. liquid-dominated magma reservoirs vs solid-dominated crystal mushes. Exsolution of volatiles upon the crystallization of anhydrous phases or decompression further modify their physical and thermal properties. A significant proportion of magmas solidifies in the crust, forming intrusive rocks, whereas a small fraction may eventually reach the surface. The convoluted history between source and surface determines the final composition and, to some extent, the rheology, ultimately controlling the dynamics of the eruption.

We invite sessions that address the production of magmas, the processes that govern the assembly and evolution of the crustal magma plumbing system, and how the journey of magmas between source and surface influences the dynamics of eruptions. 

Volcanic processes

Theme leaders: Karen Fontijn ([email protected]), Guido Giordano ([email protected]), Emma Nicholson ([email protected])

Volcanoes and their eruptions are fascinating natural phenomena that, directly or indirectly, pose considerable societal and environmental hazards whilst also providing critical resources and shaping the habitability of our planet. These multi-faceted eruption impacts have inspired many generations of scientists to work to improve our understanding of the mechanisms that drive volcanism and its impacts. This Theme on “Volcanic Processes” invites researchers to share and discuss ideas on a wide range of volcanic physical and chemical processes associated with volcanic eruptions of all sizes and styles, and including their interactions with the Earth’s subaerial and subaqueous environments. We invite sessions that deal with processes occurring during magma ascent towards the surface and their control on eruption style, processes during eruption, and processes associated with the emplacement and remobilisation of volcanic materials. We encourage colleagues to propose sessions that explore this Theme using both traditional and novel approaches, including observational, field-based, experimental, analytical or numerical methods, and combinations thereof. An integrated and multidisciplinary understanding of volcanic processes and their interactions with our planet’s natural environment will advance our collective knowledge in the field of volcanology and enhance our capacity to reduce volcanic risk.