Residual and Transported Chromite Deposits

Question 1

The laterite deposits occur as ____ soil over ultramafic rocks in Zambales, Palawan, Mindoro, Samar. Surigao, Davao Oriental, and Isabela.

Answer 1

veneer

Question 2

_____________ occur in Recent alluvial fans in Palawan and beaches along the coastlines of Central Palawan and Zambales Range.

Answer 2

Chromite-bearing black sands

Question 3

T or F. Other chromite placer deposits may be present offshore along the submerged Pleistocene beach platforms and in Tertiary sedimentary clastic products of mafic-ultramafic rocks.

Answer 3

T

Question 4

Laterites are divided into 4 zones

Answer 4

1. The top three layers represent nickeliferous laterite ore
2. the fourth layer is serpentinite.
3. The chromite-bearing layer is the lowest laterite zone.
4. The chromium content in Laterites varies and reaches its maximum value in the lowermost layer.

Question 5

The lithotectonic belts, occurring close to the trenches and troughs within the archipelago were divided by Balce et.al. (1976) as follows:

Answer 5

1) Zambales Ophiolite;
2) Casiguran Ophiolite;
3) Angat Ophiolite;
4) Eastern Bicol-Eastern Mindanao Ophiolite;
5) Western Bicol-Eastern Leyte Ophiolite;
6) Central Mindanao Ophiolite;
7) Antique Ophiolite;
8) Zamboanga-Sulu Ophiolite; and
9) Palawan Ophiolite.