Mineral Assemblages of the Sediments of the Ala Wai Canal and Its Drainage Basins, O'ahu, Hawai'i

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1995-10

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University of Hawaii Press

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To understand the origin of the mineralogy of the sediments in the Ala Wai Canal, 20 soil and stream sediment samples were collected from Manoa, Palolo, and Makiki Valleys. X-ray diffraction analysis was used to determine mineralogical composition. Four mineral assemblages are recognized: plagioclase from mechanical weathering present in Makiki Valley and pyroxene, olivine, plagioclase, and ilmenite in Manoa and Palolo Valleys; (2) maghemite, hematite, and kaolinite present in all three valleys from chemical weathering and gibbsite and goethite in Manoa Valley and goethite in Palolo Valley; (3) quartz in all three valleys from aeolian deposition; and (4) pyrite, calcite, and aragonite in the Ala Wai Canal, and kaolinite and gibbsite derived from the watershed studied.

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Fan P, Ng R, Remular D. 1995. Mineral assemblages of the sediments of the Ala Wai Canal and its drainage basins, O'ahu, Hawai'i. Pac Sci 49(4): 400-411.

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