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The Plio-Pleistocene nonmarine volcanic sandstones of the Cagayan basin, Philippines, have been significantly altered by early dissolution and cementation processes. The amount and type of alteration vary by formation, depth, and age of the deposit. Plio-Pleistocene fluvial sandstones (litharenites and feldspathic litharenites) buried to depths of 400–900 m, are only slightly compacted, but contain significant amounts of authigenic pore-lining clay and zeolites. Dissolution of plagioclase, heavy minerals, and volcanic rock fragments has occurred in nearly all samples, dissolving up to one-half the framework grains and increasing thin-section porosity to as much as 40%. The overlying Pleistocene sandstones are compositionally...

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