Arc accretion

The most important site of present-day crustal growth is in an arc environment, either through the creation of a new arc or through arc accretion. In this section we examine present-day fluxes between the mantle and the crust in an arc environment, in an attempt to begin to quantify the process of crustal growth. 

Percival, J., McNicoll, V., Bailee, A. 2006. Strike-slip Juxtaposition of ca. 2.72 Ga Juvenile arc and >2.98 Ga continent margin sequences and its implications for Archean terrane accretion, western Superior Province, Canada. Canadian Journal of Earth Sciences, 43, 895-927. 

Polat, A., Kerrich, R., Wyman, D. 1998. The late Archean Schreiber-Hemlo and White River-Dayohessarah greenstone belts, Superior Province collages of oceanic plateaus, oceanic arcs, and subduction-accretion complexes. Tectonophysics, 289, 295-326. 

The BSC (part of the Dunnage tectonic Zone) formed in Late Ordovician to Early Silurian (i.e., during the Salinic Orogeny), and contains the accreted and subducted remnants of the Middle to Late Ordovician Tetagouche-Exploits back-arc basin. Consequently, the rocks of the BSC have... 

Monnier C. (1996) Mecanismes d accretion des domaines oceaniques arriere-arc et geodynamique de I Asie du Sud-Est petrologic et geochimie des ophiolites d lndonesie (Sulawesi, Haute-Chaine Centrale, Cyclops, Seram et Meratus). Bretagne Occidentale, Nantes, 626pp. 

Taylor and McLennan (1985, 1995), like Taylor s previous estimates (Taylor, 1967, 1977), derived their cmst composition using an approach based on assumptions about its formation processes. They assumed that 75% of the cmst grew during the Archean from bimodal volcanism and the remaining 25% originated from post-Archean accretion of island arcs having an average andesite composition (from Taylor, 1977). To constrain the proportions of mafic- to felsic-Archean volcanics, they used heat-flow data... 

Miller J. D. and Christensen N. 1. (1994) Seismic signature and geochemistry of an island arc a multidisciplinary smdy of the Kohistan accreted terrane, northern Pakistan. J. Geophys. Res. (B) 99, 11623-11642. 

Isozaki Y. (1997) Jurassic accretion tectonics of Japan. Island Arc 6, 25-51. 

Figure 17 Schematic cross-section of the accreted, Jurassic Talkeetna arc in south-central Alaska based on new data and compilations by Greene et al. (2003), together with a geologic map and cross-section of the Moho exposure at Bernard Mountain, in the Tonsina region of the Talkeetna arc section, simplified from DeBari and...

Rioux M., Mattinson J., Hacker B., and Grove M. (2002a) Growth and evolution of the accreted Talkeetna arc, south-central Alaska solutions to the arc paradox . Geol. Soc. Am. Abstr. 34, 269—270. 

---