35TH INTERNATIONAL GEOLOGICAL CONGRESS
27 AUGUST - 4 SEPTEMBER 2016 | CAPE TOWN, SOUTH AFRICA
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35TH INTERNATIONAL GEOLOGICAL CONGRESS
27 AUGUST - 4 SEPTEMBER 2016 | CAPE TOWN, SOUTH AFRICA
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Symposium Details
| Title | Description | Convenors |
|---|---|---|
| Secular change in Earth evolution | Uniformitarianism has been a tenet of Earth Science since Charles Lyell. The idea that processes governing Earth systems today are largely the same as those operating throughout geologic time continues to drive many of our scientific pursuits. However, the rock record from the Archean Eon to the present preserves petrological, structural, geochemical and isotope evidence of significant changes in Earth processes. Understanding the way in which these processes have changed is paramount to our constraining the principles and applicability of uniformitarianism over the past 4.5 billion years of Earth history. Furthermore, although the early thermal history of Earth has proven challenging to model, since c. 2.5 Ga secular cooling has dominated. Questions that follow from this observation include: when and how rapid was the transition from stagnant-lid to mobile-lid ‘modern’ tectonics; how does the temperature of the mantle affect the onset of subduction and changes in subduction style; and, does the absence of ultrahigh pressure rocks in the Archean and most of the Proterozoic register a change in tectonics or is it a preservation issue? Understanding secular change in Earth processes is important because these processes affect the mechanisms of growth and reworking of the continental crust, contribute to global climate change and control the location and timing of the mineral endowments necessary to support human ambition in the future. We invite research contributions that use field-based, experimental, geophysical, petrological, geochemical, and/or modelling techniques to investigate secular change in geodynamic processes from the Hadean to the present | Christopher Spencer, Michael Brown, Blair Schoene and Elis Hoffmann |
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