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Journal of the Geological Society

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The gravity fields of Palawan and New Caledonia: insights into the subsurface geometries of ophiolites

¹ Department of Earth Sciences, University of Hong Kong, Pokfulam Road, Hong Kong, China
² Planades Foundation, University of the Philippines, Quezon City, Philippines
³ National Mapping and Resource Information Authority, MetroManila, Philippines

*Corresponding author (e-mail: gladassoc{at}btinternet.com)

New gravity data from Palawan, in the western Philippines, emphasize resemblances to New Caledonia. On both islands, ophiolites derived from root zones just offshore rest on basal surfaces that change abruptly in depth by as much as 5 km. The subsurface geometries of these thrust sheets are as important to an understanding of their emplacement histories as are their exposure patterns.