Sechura phosphate deposits, their stratigraphy, origin, and composition

Cheney, T. M.; McClellan, G. H.; Montgomery, Erica

doi:10.2113/gsecongeo.74.2.232

Cited by 32 publications

(8 citation statements)

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“…Cheney (1961) and~ Cheney et al (1979) estimates their total resources at 38 billion metric tons -a very impressive deposit! Aside from substantial size, the deposit has several characteristics which make it a very attractive candidate for future development.…”

Section: Major Land Deposits Of the Pacific Regionmentioning

confidence: 99%

The phosphate supply system in the Pacific region

Burnett

Lee

1980

GeoJournal

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Section: Major Land Deposits Of the Pacific Regionmentioning

confidence: 99%

The phosphate supply system in the Pacific region

Burnett

Lee

1980

GeoJournal

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“…At Site 471 the succession of facies resembles coeval sequences in California (Bramlette, 1946;Ingle, 1973, in press), Baja California (Ingle, 1973;Minch et al, 1976;Helenes and Ingle, 1979), coastal Peru (Cheney et al, 1979), Sakhalin (Brodskaya and Iljinskaya, 1968), and Japan (Garrison, 1976, p. 62; and references therein). The siliceous facies at this site includes upper Miocene diatomaceous ooze and clay above porcellanites; below is a thick section of middle Miocene claystone punctuated frequently with sandy turbidites, some containing phosphate pellets.…”

Section: Lithofaciesmentioning

confidence: 95%

Neogene Siliceous Sediments and Rocks off Southern California and Baja California, Deep Sea Drilling Project Leg 63

Grechin¹,

Pisciotto²,

Mahoney³

et al. 1981

Initial Reports of the Deep Sea Drilling Project

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The basal parts of Neogene diatomaceous deposits encountered off Southern California and Baja California during Leg 63 of the Deep Sea Drilling Project are diagenetically altered to chert, Porcellanite, and siliceous mud rock. This depth-related lithologic trend coincides principally with mineral transformation of opal-A to opal-CT. At DS DP Site 471, off Baja California, the boundary between the opal-A zone and the underlying opal-CT diagenetic zone corresponds to a pronounced bottom-parallel seismic reflector that can be traced at least 80 km to the northwest along the coast of Baja California. At DSDP Sites 467 and 469 in the outer California Continental Borderland and at Site 471 the d(101)-spacing of opal-CT decreases from about 4.10-4.12 Å to about 4.07 Å with increasing depth of burial. Chemical analyses and X-ray diffraction of some sedimentary rocks below the opal-CT zones at Sites 467 and 471 show significant amounts of quartz, suggesting the presence of underlying quartz diagenetic zones. Using present thermal gradients and measured depths of burial, the approximate range in the present subsurface temperature of the opal-A to opal-CT transition at Leg 63 sites isl3°Cto52 c C. The depth to this transition is generally shallower at those sites in areas of high present thermal gradients. The vertical sequences of facies encountered at Leg 63 sites are diagenetically and lithologically similar to some Neogene sequences in California, the Bering Sea, Kamchatka, Sakhalin, Japan, Peru, and Baja California. In contrast, Miocene quartz chert and spherulitic jasper intercalated with diabase and pillow basalt at Sites 469 and 471 probably represent small accumulations of thermally altered siliceous sediments deposited on active volcanic crust. Similar cherts occur in igneous rocks in the Franciscan complex in California and other Mesozoic sequences in the northwestern Cordillera.

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“…Sie besaBen einen geringfugig hoheren OH-Gehalt als der naturliche Arad-Francolit. Die synthetischen Apatite wiesen keine Hydroxylapatit-oder Fluorhydroxylcarbonatapatitmerkmale auf, da die OH-Absorptionsbande im Infrarotspektrum bei 632 cm-' fehlte und die P04-Bande bei 565 cm" nicht ausgepragter als die Absorption bei 602 cm-' war ( Cheney et al, 1979;McClellun und Gremillion, 1980;LeGeros und LeGeros, 1984).…”

Section: Diskussionunclassified

Herstellung und Verwendung ³³P‐markierter Carbonatfluorapatite zur Untersuchung der Wirkung rohphosphathaltiger Düngemittel

Resseler

Werner

1989

J Plant Nutrition & Soil

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Sechura phosphate deposits, their stratigraphy, origin, and composition

Cited by 32 publications

References 0 publications

The phosphate supply system in the Pacific region

The phosphate supply system in the Pacific region

Neogene Siliceous Sediments and Rocks off Southern California and Baja California, Deep Sea Drilling Project Leg 63

Herstellung und Verwendung ³³P‐markierter Carbonatfluorapatite zur Untersuchung der Wirkung rohphosphathaltiger Düngemittel

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Sechura phosphate deposits, their stratigraphy, origin, and composition

Cited by 32 publications

References 0 publications

The phosphate supply system in the Pacific region

The phosphate supply system in the Pacific region

Neogene Siliceous Sediments and Rocks off Southern California and Baja California, Deep Sea Drilling Project Leg 63

Herstellung und Verwendung 33P‐markierter Carbonatfluorapatite zur Untersuchung der Wirkung rohphosphathaltiger Düngemittel

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Herstellung und Verwendung ³³P‐markierter Carbonatfluorapatite zur Untersuchung der Wirkung rohphosphathaltiger Düngemittel