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MORPHOLOGICAL STUDY OF THE SURIGAO NICKELIFEROUS LATERITES MINDANAO, PHILIPPINES


FERNANDO B. ESGUERRA

 

 

 

 

ABSTRACT

 

The nickeliferous deposits lie within the bounds of the Surigao Mineral Reservation, situated along the eatern rim of the Philippine archipelago bordering the Pacific Ocean. Much of the 1,100,000-acre reservation is underlained by ultramafic rocks of various facies converted largely into serpentinites. The nickeliferous deposits, composed chiefly of iron laterites and decomposed serpentinite are residual products developed in situ during the tropical chemical weathering of the serpentinized ultramafic rocks.


The morphological treatment of these important deposits covers: (1) color, (2) profile constitution, habitus of the profile, (4) depth of profile and thickness of respective horizons, (5) texture of ore column (6) structure, (7) concretions and foreign inclusions, (8) moisture and apparent specific gravity, and (9) erodibility. The soil profile is used as the basic unit in discussing the above complex aspects of morphology. Correlation with the morphology of similar deposits in other parts of the world is made.

 

 

 

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