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MINERALOGY AND GEOCHEMISTRY OF THE HUSSAINIYAT KARST BAUXITES AND ZABIRA STRATIFORM BAUXITE IN NORTHERN ARABIAN PENINSULA | ||
| Iraqi Bulletin of Geology and Mining | ||
| Article 1, Volume 1, Issue 2, 2005, Pages 15-44 | ||
| Author | ||
| Khaldoun S. Al-Bassam | ||
| Abstract | ||
| Two early Cretaceous bauxite deposits in Northern Arabian Peninsula are studied in this paper; the Zabira sratiform deposits and the Hussainiyat karst deposits. The textural constituents are similar in both deposits; colloform grains (pisoids and ooids) are dominant, but they are better developed in the stratiform bauxite suggesting higher maturation. Boehmite and gibbsite are the only bauxite minerals; the former is dominant in the karst bauxite whereas the latter is dominant in the stratiform bauxite. Various amounts of kaolinite are retained in these bauxites. Hematite and anatase are accessary minerals. The former is more enriched in the stratiform bauxite; inherited from source rocks. Compared to source rocks, Fe, Ni and to some extent Co were depleted during bauxitization in both types of bauxite deposits, whereas Ga and Zr were enriched together with Al. Uranium was depleted in the stratiform bauxites and enriched in the karst bauxite relative to source rocks, whereas Cr behaved oppositely; both elements are controlled by oxidation potential during bauxitiztion. The hidden karst bauxites have suffered less diagenetic and epigenetic modifications relative to the exposed stratiform bauxites. Resilication is one of the diagenetic modifications found in the stratiform deposits only. Epigenetic calcite, alunite and gypsum were introduced later in both deposits under arid climate. | ||
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