Download or read book Magmatism and Ore Deposit Formation in SW Pacific Island Arcs written by George Dimitrov Kamenov and published by . This book was released on 2004 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comparison between the isotopic compositions of lavas, and crustal and mantle xenoliths indicate that the incompatible elements in the TLTF magmas, including a major part of the ore metals, were ultimately derived from a subducted oceanic slab with Pacific mantle affinity. Regional and local isotopic trends in the volcanic rocks in the region indicate that subducted oceanic slabs overall control the composition of the island-arc magmas. Once the contribution from the subducting slab decreases, incorporation of a mantle component with Indian affinity can be identified in the isotopic composition of the lavas in the region.