Accretionary wedge Oceanic Forearc crust Trench basin Volcanic island ark Backarc region Sea level Magma Lithosphere 100 km depth http://bwbearthenviro 2011.wikispaces.com Figure 12. Formation of a volcanic island arc Formation of the Philippine Archipelago Many parts of the Philippines originated from oceanic-oceanic convergence. This resulted from the collision of two oceanic plates, with one of the plates diving under the other. 19 All rights reserved. No part of this material may be reproduced or transmitted in any form or by anym electronic or mechanical including photocopying-without written permission from the DepEd Central Office 24 / 84 Majority of the islands in the Philippine archipelago are considered as part of the Philippine Mobile Belt. These islands were formed 65 million years ago at the southern edge of the Philippine Sea Plate and are considered as part of island arcs. Other parts of the Philippines, such as Palawan, Mindoro, and the Zamboanga Peninsula are all highland sections of the Sundaland block of the Eurasian plate (see Figure 13). ...
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