34-th International Geological Congress

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Start Date: 
Sunday, August 5, 2012
End Date: 
Friday, August 10, 2012

Location: Brisbane, Australia

Web: http://www.34igc.org/

Includes the following sessions:

21.4. Magmatism in extensional environments (continental rifts and MORB)

Convenors: Trevor Falloon (trevor.falloon@utas.edu.au), Yaoling Niu (yaoling.niu@durham.ac.uk)

This Symposium will explore new advances in our understanding of magmatic compositions and processes involved in the initiation of continental rifting, leading to continental breakup and the eventual development of major ocean basins. We therefore especially invite contributions related to continental rifts, and mid-ocean ridge spreading environments. A special focus of this theme will be new understandings related to the timing of melt generation, migration, crystallization and cooling of magmatic rocks in these environments. However all aspects of magma petrogenesis are welcome.

Keynote speaker: Kenneth Rubin (University of Hawaii)


21.5. Intraplate magmatism, including ocean island basalts, continental basalt provinces, kimberlites and lamproites

Convenors: Ben Cohen (b.cohen@uq.edu.au), Ian McDougall (ianmcdougall@anu.edu.au), Godfrey Fitton (godfrey.fitton@ed.ac.uk)

This Symposium will examine the advances in our understanding of the processes involved in the generation of oceanic and continental intraplate magmas, including kimberlites and lamproites. Of particular interest is the role, or not, of mantle plumes in the generation of intraplate magmas. Some (e.g., Hawaii) appear to require anomalously hot mantle, but evidence for high-temperature mantle is apparently lacking in most. To what extent can intraplate magmatism be explained through fertile domains in the asthenosphere or lithospheric mantle? Do mantle plumes carry a diagnostic geochemical signature? What can geochronology and paleomagnetism tell about the time-space distribution of intraplate magmatism? Submissions addressing these, and other issues relating to the petrogenesis and geochemistry of intraplate magmatism, are welcomed for this Symposium.

Keynote speaker: Anthony Koppers (Oregon State University)


21.6. Large Igneous Provinces and their impact on the lithosphere, atmosphere and biosphere

Convenors: Scott Bryan (scott.bryan@qut.edu.au), Steve Self (stephen.self@nrc.gov), Ingrid Ukstins-Peate (ingrid-peate@uiowa.edu)

Large igneous provinces (LIPs) represent episodic, catastrophic igneous events throughout Earth history. They are distinguished by high intensity bursts of principally mantle-derived magma to the crust and surface over geologically short timescales. LIP volcanism had a major impact on the lithosphere, atmosphere and biosphere, and consequently has been implicated as a driving factor in environmental change based on the temporal relationship with several mass extinction events through the Phanerozoic. Not only can individual eruptions pose a significant hazard through atmospheric loading of volcanic aerosols, but elevated eruption frequency and the potential for synchronous mafic ± silicic large-magnitude (>M8) eruptions mean that environmental change may be exacerbated by the cumulative effects of multiple eruptions, both direct and indirect. Over the last 10 years, proposed mechanisms for environmental change include volcanic CO2 or S emissions, gas emissions from clathrate or hydrocarbon disturbance, and Fe fertilisation of oceans from ash loading. This Symposium seeks cross-disciplinary contributions from the Earth, atmospheric, climate, and biological sciences that are investigating the lithospheric to atmospheric impact of LIPs. Contributions focusing on assessing the integrated impact and the rates and mechanisms of Earth system response to LIP magmatism are encouraged.

Keynote speakers: Benjamin Black (Massachusetts Institute of Technology), Richard Ernst (Ernst Geosciences), Charlotte Vye (British Geological Survey), Sverre Planke (Volcanic Basin Petroleum Research AS), Paul Wignall (University of Leeds)

Brisbane, Australia