Geology of natural zeolites and zeolitic rocks

Iijima, Azuma

doi:10.1351/pac198052092115

Cited by 73 publications

(57 citation statements)

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“…Minerals of hydrothermal and authigenic origin include abundant analcime and albite, adular, strontiobaryte, sepiolite, smectite and pyrite. Analcime characterizes tuffs of andesitic composition and is also present in other volcanogenic rocks (Hay 1977;Iijima 1980;Utada 2001). The tuff layer may be related to volcanism along fracture zones on the flanks of the Chicxulub crater.…”

Section: Volcanic Tuff Layer In Unit Kmentioning

confidence: 99%

Yaxcopoil-1 and the Chicxulub impact

Stinnesbeck

Keller

Adatte

et al. 2004

Int J Earth Sci (Geol Rundsch)

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CSDP core Yaxcopoil-1 was drilled to a depth of 1,511 m within the Chicxulub crater. An organic-rich marly limestone near the base of the hole (1,495 to 1,452 m) was deposited in an open marine shelf environment during the latest Cenomanian (uppermost Rotalipora cushmani zone). The overlying sequence of limestones, dolomites and anhydrites (1,495 to 894 m) indicates deposition in various carbonate platform environments (e.g., sabkhas, lagoons). A 100-m-thick suevite breccia (894-794 m) identifies the Chicxulub impact event. Above the suevite breccia is a dolomitic limestone with planktic foraminiferal assemblages indicative of Plummerita hantkeninoides zone CF1, which spans the last 300 ky of the Maastrichtian. An erosional surface 50 cm above the breccia/dolomite contact marks the K/T boundary and a hiatus. Limestones above this contact contain the first Tertiary planktic foraminifera indicative of an upper P. eugubina zone P1a(2) age. Another hiatus 7 cm upsection separates zone P1a(2) and hemipelagic limestones of planktic foraminiferal Zone P1c. Planktic foraminiferal assemblages of Zone Plc to P3b age are present from a depth of 794.04 up to 775 m. The Cretaceous carbonate sequence appears to be autochthonous, with a stratigraphic sequence comparable to late Cretaceous sediments known from outside the Chicxulub crater in northern and southern Yucatan, including the late Cenomanian organic-rich marly limestone. There is no evidence that these sediments represent crater infill due to megablocks sliding into the crater, such as major disruption of sediments, chaotic changes in lithology, overturned or deep dipping megablocks, major mechanical fragmentation, shock or thermal alteration, or ductile deformation. Breccia units that are intercalated in the carbonate platform sequence are intraformational in origin (e.g., dissolution of evaporites) and dykes are rare. Major disturbances of strata by the impact therefore appear to have been confined to within less than 60 km from the proposed impact center. Yaxcopoil-1 may be located outside the collapsed transient crater cavity, either on the upper end of an elevated and tilted horst of the terrace zone, or even outside the annular crater cavity. The Chicxulub site thus records a large impact that predates the K/T boundary impact and mass extinction.

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Section: Volcanic Tuff Layer In Unit Kmentioning

confidence: 99%

Yaxcopoil-1 and the Chicxulub impact

Stinnesbeck

Keller

Adatte

et al. 2004

Int J Earth Sci (Geol Rundsch)

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“…this lowest ash-flow interval of the lower Tram shows the zonal change from clinoptilolite (zone II) to analcime (zone III) (Iijima, 1975(Iijima, , 1980Iijima and Utada, 1971). The shards and pumice retain their original morphologies but are crystallized to zeolites.…”

Section: Ementioning

confidence: 96%

“…Iijima and coworkers tentatively assigned zone boundaries from downhole temperature measurements in Japan to marine tuffs that are currently undergoing zeolitization (Iijima, 1975(Iijima, , 1978(Iijima, , 1980Iijima and Owha, 1980;Iijima and Utada, 1971). Some applications of recent studies on zeolite zonation to radioactive waste isolation are being reviewed by Smyth and Caporuscio (1981).…”

Section: Most Of the Or + Cn Values Are Within A Narrow Range And Allmentioning

confidence: 99%

“…Pressure does not appear to be a significant variable in the pressure range below 100 MPa (1 kbar) typical of most zeolite-grade metamorphic regimes (Iijima, 1980). Iijima (1975Iijima ( , 1978 defined two compositionally distinct zeolite sequences: an alkali series dominated by sodium and potassium zeolites typical of altered silicic volcanics, and a calcic series dominated by calcium zeolites typical of altered andesitic to basaltic tuffs.…”

Section: Most Of the Or + Cn Values Are Within A Narrow Range And Allmentioning

confidence: 99%

“…Following the temperature zones of Iijima (1975Iijima ( , 1978Iijima ( , 1980 and Iijima and Oliwa (1980), it is possible to estimate temperatures of zone boundaries achieved in the rocks of the core. Sodium concentrations present in pore fluids are estimated to be 200 to 1000 ppm based on well water compositions between 200 and 500 ppm (Winograd and Thordarson, 1975).…”

Section: A Maximum Geothermal Gradientmentioning

confidence: 99%

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Preliminary stratigraphic and petrologic characterization of core samples from USW-G1, Yucca Mountain, Nevada

Waters¹,

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Performance of a Grey Water Pilot Plant Using a Multi‐Layer Filter for Agricultural Purposes in the Jordan Valley

Ghrair

Al‐Mashaqbeh

Megdal

2014

CLEAN Soil Air Water

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A pilot grey water treatment system and collection network were designed, installed, and operated in Jordan Valley using natural filtration materials. Grey water from showers and washing sinks was collected from four houses. In order to evaluate the performance of multi-layer filter (MLF) ability to remove the pollutants from the collected grey water, the quality of treated and untreated grey water was examined and the suitability of treated grey water for irrigation was assessed. The results revealed that the efficiency removal of organic material before UV disinfection stage for BOD 5 , COD, and TSS was about 88.6, 83, and 92.2%, respectively. The efficiency removal rates for nutrients by MLF were a bit low as 32.5% of total phosphorous and 19.8% of total nitrogen were removed, whereas the removal efficiency of heavy metals Zn, Fe, and Ba were 94.8, 81.2, and 15.7%, respectively. The results showed that the pilot plant has efficiently reduced the coliform organisms, thermo-tolerance coli count, and Escherichia coli by more than 99.9% removal efficiency by the double-filter stage and 100% after disinfection stage. The current MLF system has the transferability potential to other locations of the developing world.

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Geology of natural zeolites and zeolitic rocks

Abstract: Present status, particularly development in the latest decade, of the geology of natural zeolites and zeolitic rocks has been overviewed. Emphases are focused on the classification of genetical occurrences and the synthesis deduced from the nature..

Cited by 73 publications

References 0 publications

Yaxcopoil-1 and the Chicxulub impact

Yaxcopoil-1 and the Chicxulub impact

Preliminary stratigraphic and petrologic characterization of core samples from USW-G1, Yucca Mountain, Nevada

Performance of a Grey Water Pilot Plant Using a Multi‐Layer Filter for Agricultural Purposes in the Jordan Valley

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