GEOLOGICAL SOCIETY OF THE PHILIPPINES

PISOLITE IN RIO TUBA PROPERTY

 

Michio Iwai
Rio Tuba Nickel Mining Corporation (Philippines)

Yoshio Ogura
Resources Research Institute (Tsukuba, Japan)


ABSTRACT

         In the laterite at the surface and in the horizon near it, numerous blackish brown pisolite with diameters of several mm to about 1.5cm are contained. Some of the pisolites can be divided into crust and core from their internal structure, which is similar to that of Mn nodule on ocean floor. In the crust, several light and dark stripes are produced in a concentric circle. The minerals comprising these stripes are considered to be very fine particles irregularly intermixed, but two minerals 4.7 A manganite and goethite, can be detected clearly. At time, from the core to the crust, along with the major constituent, Fe and Mn, Co, Ni and Cr are found at higher concentrations than in the surrounding laterite, and some correlation between Mn and Co, or regular distribution of some other elements are observed.

 
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