Table 1 Significant regional geologic features are delineated on the isostatic anomaly map of the Philippines
General anomaly | Correlation | Location |
|---|---|---|
Low-gravity anomaly (< 0 mGal) | Sedimentary Rocks | Ilocos-Central Luzon Basin (ICL), Cagayan Valley Basin (CV), Mindoro Basin, Southern Luzon - Bicol Basin, Iloilo Basin, Visayan Sea Basin, Samar Basin, Agusan-Davao Basin (AD), Cotabato Basin |
Moderate gravity anomaly (0 to 80 mGal) | Metamorphic Rocks | Continental: Northern Palawan-Mindoro Block (NPM), Antique Range (AR) Island Arc: Eastern Luzon, Southern Visayas, Mindanao |
High-gravity anomaly (> 80 mGal) | Ophiolitic Rocks | Western Luzon (Zambales Ophiolite Complex), Northeast Luzon (Ilocos Norte Ophiolite/Peridotite), Eastern Luzon (Isabela Ophiolite), Southeastern Luzon (Cadig Ophiolite Complex, Lagonoy Ophiolite, Cagraray Peridotire, Pangasinan Peridotite), Mindoro (Amnay Ophiolite), Antique (Antique Ophiolite), Eastern Visayas-Mindanao (Dinagat Ophiolite), Central Mindanao (Awang Ultramafic Complex, Pantaron Ultramafic Complex), Western Mindanao (Polanco Ophiolite), Southeastern Mindanao (Pujada Ophiolite) |