Mineralogy of Cenozoic Sediments Cored during Deep Sea Drilling Project Leg 79 as Determined by X-Ray Diffraction

Schümann, Dirk

doi:10.2973/dsdp.proc.79.110.1984

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“…The only major difference between the clay mineralogy of the Leg 93 sites examined in this study and the Leg 79 sites (Schumann, 1984) is the lack of fibrous silicates (sepiolite and palygorskite) at Sites 604 and 605. The fibrous silicates are neoformed clay minerals, which form in humid subtropical environments, commonly in alkaline basins.…”

Section: Comparison Of Site 604 and 605 Clay Mineralogy With Other Nomentioning

confidence: 98%

“…Leg 79 drilled Sites 544 to 547 on the Mazagan Escarpment off northwestern Africa, and a preliminary study of the clay mineralogy of these sites was made by Schumann (1984). At Site 544, Holes 544A and 544B (3607 m water depth) recovered early middle Miocene to Pleistocene clayey foraminiferal nannofossil ooze.…”

Section: Comparison Of Site 604 and 605 Clay Mineralogy With Other Nomentioning

confidence: 99%

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Cenozoic Clay Mineralogy of Sites 604 and 605, New Jersey Transect, Deep Sea Drilling Project Leg 93

Dunn¹,

Patrick²,

Cooley³

1987

Initial Reports of the Deep Sea Drilling Project

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Examination of the clay mineralogy of Cenozoic sediment samples from Deep Sea Drilling Project Sites 604 and 605 on the upper continental rise off New Jersey indicates that sediment deposition of two different clay mineral facies has occurred. These sites are marked by Paleogene deposition of illite with subordinate kaolinite and smectite covarying in inverse proportion, and by Neogene deposition dominated by illite with subordinate kaolinite and chlorite. Leg 93 results agree with the clay mineral facies proposed by Hathaway (1972), which defined a "Northern facies" consisting of illite and chlorite, with feldspar and hornblende, from erosion of rocks north of Cape Hatteras, and a "Southern facies" composed of smectite, kaolinite, and mixed-layer illite-smectites. Neogene and Quaternary sediments at Sites 604 and 605 contain the "Northern facies," and Paleogene sediments contain the "Southern facies" minerals. Feldspar is exclusively found in Neogene-Quaternary sediments, as is the majority of the amphibole found in these samples. Widespread Paleogene volcanic source materials are suggested by the presence of smectite throughout the early Paleocenemiddle Eocene sediments recovered at Site 605. The clay mineral stratigraphy at Leg 93 sites is comparable to the record at nearby DSDP sites on the lower continental rise and abyssal plain of the northwestern Atlantic (DSDP Sites 388, 105, and 106), and also with the sediments recovered by drilling on the Mazagan Plateau off northwestern Morocco (DSDP Sites 544-547) in the eastern North Atlantic.

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Section: Comparison Of Site 604 and 605 Clay Mineralogy With Other Nomentioning

confidence: 98%

Section: Comparison Of Site 604 and 605 Clay Mineralogy With Other Nomentioning

confidence: 99%

Cenozoic Clay Mineralogy of Sites 604 and 605, New Jersey Transect, Deep Sea Drilling Project Leg 93

Dunn¹,

Patrick²,

Cooley³

1987

Initial Reports of the Deep Sea Drilling Project

View full text Add to dashboard Cite

show abstract

Mineralogy of Cenozoic Sediments Cored during Deep Sea Drilling Project Leg 79 as Determined by X-Ray Diffraction

Cited by 1 publication

References 3 publications

Cenozoic Clay Mineralogy of Sites 604 and 605, New Jersey Transect, Deep Sea Drilling Project Leg 93

Cenozoic Clay Mineralogy of Sites 604 and 605, New Jersey Transect, Deep Sea Drilling Project Leg 93

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