Distribution and morphology of Chatham Rise phosphorites
Pasho, D.W. (1976). Distribution and morphology of Chatham Rise phosphorites. NIWA Biodiversity Memoir, 77. New Zealand Oceanographic Institute: Wellington. 28 pp.
Deel van: New Zealand Oceanographic Institute Memoir. New Zealand Department of Scientific and Industrial Research: Wellington. ISSN 0083-7903, meer
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| Abstract |
This study is based on an extensive programme of sampling for phosphorite nodules, undertaken by Global Marine Inc., on the Chatham Rise during 1967 and 1968. The data resulting from this survey substantially increase knowledge of the general geology and geomorphology of Chatham Rise, and reconstructions are presented of the structure, stratigraphy and geological history or the region in the light or the new evidence. The nature of the phosphorite nodules has been studied in considerable detail, and fresh information on the distribution and on the complex mineralogy and geochemistry of the phosphorite is discussed. Glauconite commonly accompanies the phosphorite on the Chatham Rise as discrete sandsize grains and as thin coatings on nodules, and this association is described in some detail. Finally, an interpretation is given of the evolution of the Chatham Rise phosphorite nodules by phosphatisation of late Miocene foraminiferal oozes, followed by uplift, fragmentation and weathering under subaerial conditions before resubmergence. |
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