Active continental margin

Mantle garnet peridotites represent mantle rocks exhumed to the surface along active continental margins or continent-continent sutures. These peridotites may be classified in three main groups (modified after Bmeckner and Medaris, 2000) ... 

Miyashiro A. (1974) Volcanic rock series in island arcs and active continental margins. Am. J. Sci. 274, 321-355. 

Meijer, P. T. 1995. Dynamics of active continental margins the Andes and the Aegean region. PhD thesis. University of Utrecht. 

Although some diversity exists in REE patterns, especially in first-cycle sediments (particularly those from volcanically active continental margins), the average REE pattern is very similar for most shales These REE patterns are enriched in the light REE (LREE = La-Sm) relative to chondritic patterns, that are taken as representative of the bulk Earth, and have a depletion in Eu relative to the neighboring REE, Sm, and Gd (usually referred to as a negative Eu anomaly )- The converse enrichment in Eu is often referred to as a positive Eu anomaly. ... 

The Zr/Y-Zr diagram can also be used to subdivide island-arc basalts into those belonging to oceanic arcs, where only oceanic crust is used in arc construction, and arcs developed at active continental margins (Pearce, 1983). Oceanic arcs plot in the island-arc field originally defined by Pearce and Norry (1979) whilst continental-arc basalts plot with higher Zr/Y and higher Zr (Figure 5.5b). 

Figure SJ4 The La/Yb-Sc/Ni discriminadon diagram for andesites (after Bailey, 1981) showing the fields of Andean-type (active continental margin), continental island-arc, low-K oceanic island-arc and other oceanic island-arc andesites.

Granites in oceanic arcs dominated by tholeiitic basalt Granites in oceanic arcs dominated by calc-alkalt basalt Granites in active continental margins... 

Active continental margin — Andean- pe basins developed on or adjacent to thick continental margins. Strike-slip basins also develop in this environment... 

The fields arc oceanic island-arc, continental island-arc, active continental margin and passive margin., ... 

Pearce JJk., 1983, Role of the sub-continental lithosphere in magma genesis at active continental margins. In Hawkesworth C.J. and Nony M.J. (eds.), Continental basalts and mantle xesaliths. Shiva, Nantwteh, pp. 230-249. 

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