Biotite Weathering and Clay Formation in Arid and Humid Regions, California

Ismail, F

doi:10.1097/00010694-197004000-00011

Cited by 26 publications

(10 citation statements)

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“…For example, the weathering of biotite in the Baikal drainage basin followed the pathway from biotite to smectite through illite and vermiculite, and finally to kaolinite (Solotchina et al, 2009). In arid and semi-arid regions, biotite derived from metamorphic basement rocks changes by weathering to vermiculite and then to illite and smectite (Ismail, 1970;Buol and Weed, 1991). Clay minerals, as well as quartz and biotite particles, are derived from physical erosion of exposed rock surfaces (Sakai et al, 2005).…”

Section: Changes In Climate and Weathering Condition On The Watershedmentioning

confidence: 99%

Last glacial to post glacial climate changes in continental Asia inferred from multi-proxy records (geochemistry, clay mineralogy, and paleontology) from Lake Hovsgol, northwest Mongolia

Watanabe

Minoura

Nara

et al. 2012

Global and Planetary Change

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Section: Changes In Climate and Weathering Condition On The Watershedmentioning

confidence: 99%

Last glacial to post glacial climate changes in continental Asia inferred from multi-proxy records (geochemistry, clay mineralogy, and paleontology) from Lake Hovsgol, northwest Mongolia

Watanabe

Minoura

Nara

et al. 2012

Global and Planetary Change

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“…Biotite, an important precursor of the secondary clay minerals, changes into illite, vermiculite, and smectite during weathering (Buol and Weed, 1991). The mineralogical results suggest that biotite derived from the metamorphic basement rocks progressively weathered to vermiculite and then to illite and smectite, a progression typical of arid and semi-arid regions (Ismail, 1970). Under warm and humid conditions, biotite is transformed to kaolinite via hydrobiotite or vermiculite (Buol and Weed, 1991).…”

Section: Discussionmentioning

confidence: 99%

Last-glacial to postglacial climate formation in the continental interior inferred from multi-proxy records of Lake Hovsgol, Mongolia

Minoura

Sugawara

Kawai³

2010

Preprint

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Knowledge of the evolution of arboreal forests is necessary to interpret the cause of climate formation in intracontinental regions. Paleoproxy records of sediment cores from Lake Hovsgol, Mongolia show that watershed conditions have fluctuated widely during the last 30 ka because of changing orbital parameters. Termination of glacial cooling and the subsequent prevalence of deglacial warming were consequences of solar forcing. Arboreal forests exerted an important influence on the atmospheric moisture cycle at high latitudes. Air pressure decreased because of raised humidity from water vapor penetration into inland regions that occurred along with summer monsoons. Data showing utilization of solar energy are necessary for establishing climate conditions. Atmospheric warming under increased insolation caused a shift of the monsoon limit to the north, amplifying the summer moisture supply to the watershed. That amplification engendered the appearance of the maximum vegetation in the Hovsgol drainage basin at the beginning of the Holocene. The retreat of arboreal forests that occurred along with decreased solar energy shrank the humidification-vegetation feedback loop, thereby decreasing the atmospheric humidity. The consequently lowered vapor pressure contributed to the incursion of cool air masses from the north

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“…However, mixed-layer minerals of the illite/smectite type can already be the product of diagenesis of glaciolimnic material. During this process illites occurring in the sediment underwent depotassication, which could be promoted by the reaction of pH 6-7 assayed in that sediment (Ismail 1970;Crawford et al 1983). …”

Section: Discussionmentioning

confidence: 99%

Clay minerals from Weichselian glaciolimnic sediments of the Sępopolska Plain (NE Poland)

Długosz¹,

Orzechowski²,

Kobierski³

et al. 2009

Geologica Carpathica

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Glaciolimnic deposits sampled from three sedimentation reservoirs located on the Sępopolska Plain (northeastern Poland) were investigated. The material under study was deposited in the recession phase of the Pomeranian phase of Vistula (Weichselian) glaciation. The clay fraction was separated by centrifugation after preparation according to Jackson. Mineralogical investigations were done by X-ray diffraction. The analysed deposits had a similar complex composition of clay minerals. The main components were illites mixed with the illite/smectite mineral with percentages < 10 % S. Another part were minerals of the illite/smectite type which had differentiated content of smectite layers (mainly 80-90 % S). There were also chlorite minerals, probably as mixed layer minerals of the chlorite/vermiculite type or HIV with a negligible amount of chlorite layers. The results indicated that all the deposits were of the same age as well as similar deposited material and the samples are different from typical Pomeranian till and typical limnic material of the same age. Small differences observed among the deposits of specific sedimentation reservoirs were probably the result of later processes.

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Biotite Weathering and Clay Formation in Arid and Humid Regions, California

Cited by 26 publications

References 0 publications

Last glacial to post glacial climate changes in continental Asia inferred from multi-proxy records (geochemistry, clay mineralogy, and paleontology) from Lake Hovsgol, northwest Mongolia

Last glacial to post glacial climate changes in continental Asia inferred from multi-proxy records (geochemistry, clay mineralogy, and paleontology) from Lake Hovsgol, northwest Mongolia

Last-glacial to postglacial climate formation in the continental interior inferred from multi-proxy records of Lake Hovsgol, Mongolia

Clay minerals from Weichselian glaciolimnic sediments of the Sępopolska Plain (NE Poland)

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