LSU Digital Commons LSU Digital Commons Continent formation through time Continent formation through time
LSU Digital Commons LSU Digital Commons Continent formation through time Continent formation through time
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: The continental crust is the primary archive of geological history, and is host to most of our natural resources. Thus, the following remain critical questions in Earth Science, and provide an underlying theme to all of the contributions within this volume: when, how and where did the continental crust form? How did it differentiate and evolve through time? How has it has been pre- served in the geological record? This introductory review provides a background to these themes, and provides an outline of the contributions contained within this volume. The long-lived study indicates that magma- tism is by crustal recycling, rather than crustal growth. Boekhout et al. address continental growth along the pre-Andean convergent margin using a compilation of igneous and detrital zircon data. The authors compare changes in the Hf-isotope compositions of zircons through time with the geo- dynamics of the continental margin and show a link between arc migration, slab retreat and advance, and the resulting isotopic composition of magmatism. The data show an overall trend towards more juven- ile compositions throughout much of the Phanero- zoic, which the authors interpret as recording an overall increase in continental growth rate. Trends in isotope space that represent a greater degree of crustal reworking correlate with known periods of slab advance within a compressional regime. et study the paragneiss
