Zeolites in South Atlantic Deepsea Sediments

McCoy, Floyd W.; Zimmerman, Herman; Krinsley, Daniel B.

doi:10.2973/dsdp.proc.39.111.1977

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…Clinoptilolite is a K-rich zeolite of the heulandite family, and is commonly reported, in addition to phillipsite (Kastner and Stonecipher, 1978), in deep-sea sediments (McCoy et al, 1977;Kastner and Stonecipher, 1978;Riech and von Rad, 1979;Thein and von Rad 1987;. Such zeolites are generally of diagenetic origin, although a common diagenetic evolution for zeolites is not generally accepted.…”

Section: Clinoptilolitementioning

confidence: 99%

Analysis of Sedimentary Facies Using Bulk Mineralogic Characteristics in Cretaceous to Quaternary Sediments from the Kerguelen Plateau: Sites 737, 738, and 744

Bohrmann¹,

Ehrmann²

1991

Proceedings of the Ocean Drilling Program

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Carbonate-free portions of Upper Cretaceous to Holocene sediment samples from the Kerguelen Plateau in the southern Indian Ocean were investigated by X-ray diffraction. Downhole variations in the content of opal-A, opal-CT, quartz, feldspar, barite, and clinoptilolite were studied at Site 737 on the northern Kerguelen Plateau and at Sites 744 and 738 on the southern Kerguelen Plateau. The variation of these components reflects temporal changes in the depositional history of the Kerguelen Plateau as well as major differences in the sedimentary evolution between the northern plateau and the southern plateau.Carbonate is the dominant component in the pelagic sediments on the Kerguelen Plateau. In addition, biogenic opal sedimentation plays an important role throughout most of the sequence. A major increase in opal accumulation is documented at all sites in late Miocene time, which is in accordance with the well-known increase in silica productivity probably caused by a major cooling step. Because of its position near the Polar Frontal Zone, sediments from Site 737 show a more extensive opal deposition than at Sites 744 and 738. An earlier productivity pulse is documented at Site 744 on the southern plateau within the early Oligocene, following the initial phase of intense East Antarctic glaciation. This cooling event resulted in higher amounts of ice-rafted terrigenous quartz and, to a lesser extent, feldspar. With the exception of the Site 744 sediments, opal deposition in Paleogene and older sediments can be reconstructed only from the diagenetic transformation products of opal-CT and probably clinoptilolite. In contrast to the southern sequence, on the northern Kerguelen Plateau higher amounts of clinoptilolite and no opal-CT were found. These major differences in the diagenetic environments may be due to extensive volcanism in the northern area. The volcanic influence at Site 737 is well recorded by the higher feldspar content and higher amounts of volcanic glass shards.

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Section: Clinoptilolitementioning

confidence: 99%

Analysis of Sedimentary Facies Using Bulk Mineralogic Characteristics in Cretaceous to Quaternary Sediments from the Kerguelen Plateau: Sites 737, 738, and 744

Bohrmann¹,

Ehrmann²

1991

Proceedings of the Ocean Drilling Program

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“…Zeolites are particularly abundant in the Brazil Basin, occurring throughout the Site 515 sedimentary section and at Site 355 (McCoy et al, 1977). The paragenesis of zeolites in marine sediments is still somewhat of an open question, and various relations to diagenetic sources, companion lithologies, sedimentation rates, and formation ages are advocated.…”

Section: Patterns Of Zeolite Accumulationmentioning

confidence: 99%

X-Ray Mineralogical Analyses

Coulbourn¹

1983

Initial Reports of the Deep Sea Drilling Project, 72

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Sites 515 to 518 were continuously cored during Leg 72. Sediment mineralogy determined from visual examination of core sections, microscopic inspection of smear slides, and interpretation of X-ray diffractograms made from 436 bulk samples from those sites reveal aspects of the Coniacian to Recent regional history of sedimentation in the Brazil Basin and on the Rio Grande Rise.Drilling in the Brazil Basin at Site 515 penetrated Recent to Oligocene terrigenous and biogenic siliceous muds, and limey Eocene muds. Quartz occurs throughout; illite is dominant in the Quaternary and Pliocene and montmorillonite in the Miocene and Oligocene muds. Kaolinite is common in the Quaternary and Pliocene sediments, the whole of which are punctuated by carbonate-rich laminations and beds. Phülipsite is common in the Oligocene to Recent sediments, and clinoptilolite dominates the Eocene calcitic muds. A pronounced lag deposit in 515B-55.CC marks an unconformity that separates multicolored, extensively bioturbated lower Eocene sediments from overlying upper Oligocene siliceous mudstones.The lithologic section at Site 516 on the Rio Grande Rise is dominantly carbonate with a succession of dominant clay components: illite in the Recent to Oligocene pelagic carbonate ooze and chalk; montmorillonite in the Eocene volcanogenie limestone; illite again in the Paleocene to lower Maestrichtian flaser limestone; kaolinite in the Campanian and Santonian limestone and marly limestone; montmorillonite again in the Coniacian /noceromus-bearing limestone. Important diagenetic events are the chertification of the Eocene deposits and dolomitization of the Paleocene and Cretaceous deep-water limestones.The shallow penetration hydraulic piston cores from Sites 517 and 518, located on the western flank of the Rio Grande Rise, are dominantly carbonates. An illite-rich bed in the middle Miocene sediments of Site 518 records a time of intense dissolution, perhaps an episode of abundant northward flow of Antarctic Bottom Water.

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“…They were reported from surface sediments as well as from sediments of different ages in the Atlantic Ocean (e.g. Mt~LII~RE, 1979;McCoY et al, 1977;RIECH & VON RAD, 1979;THEIN & VON RAD, 1987;THUt~OW, 1988), in the Pacific Ocean (e.g. BONATTI, 1963;STONECIPHER, 1976;KASTNER & STONECIPHER, 1978), and in the Indian Ocean (e.g.…”

Section: Introductionmentioning

confidence: 99%