Mineralogy, fabric properties and classification of weathered granites in Hong Kong

Irfan, T. Y.

doi:10.1144/gsl.qjegh.1996.029.p1.02

Cited by 205 publications

(85 citation statements)

References 28 publications

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“…(CIA-50)] (Voicu et al, 1996). The sesquioxide content (SOC) was the Fe2O3 and Al2O3 content in a sample which are insoluble oxides (Irfan, 1996). For soil texture analysis, soil organic matter and carbonates were removed with hydrogen peroxide and diluted hydrochloric acid, respectively.…”

Section: Methodsmentioning

confidence: 99%

Genesis and classification of soils developed on gabbro in the high reliefs of Maroua region, North Cameroon

Tsozué

Nzeukou

Azinwi

2017

Eurasian Journal of Soil Science (Ejss)

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Article Info Received : 19.10.2016 Accepted : 15.12.2016 The purpose of this work was to examine the genesis, properties and classification of soils resulting from the weathering of gabbro rock in the high reliefs of Maroua in the Far North Region of Cameroon. The studied soils were ~ 2 m thick, made of four horizons which consisted of coarse saprolite, fine saprolite, loose loamy clayey horizon and humiferous horizon. From petrographical view point, at the bottom of the soil profile, the preservation of the bedrock structure was marked by numerous remnants of altered plagioclases shapes. The groundmass was characterized by a double spaced fine, ranging to equal, enaulic c/f related distribution pattern. It was yellowish, characterized by weakly separated granular microstructure in the fine saprolite and had a speckled and cloudy limpidity in the loose loamy clayey horizon. Secondary minerals consisted of montmorilonite, kaolinite, goethite, quartz, gibbsite, lepidocrocite, sepiolite, feldspar and calcite. Globally, Si/Al ratio ranged between 2.85 and 3.24. The chemical index of alteration ranged from 50.95 to 55.27 % while the mineralogical index of alteration values were between 1.90 and 10.54 %. Physicochemically, soil pH varied from slightly acidic to slightly above neutral. Soil organic carbon contents were low to very low. Exchangeable bases contents were high, mostly represented by Ca 2+ and Mg 2+ . The CEC of soils and the CEC of clay were also high, ranging respectively between 53.68 and 82.88 cmol(+).kg -1 , and 116.80 and 181.38 cmol(+).kg -1 . The studied soils were classified as dystric haplustepts clayey isohyperthermic. They were developed in situ by the collapse of primary mineral structures from the bottom of the coarse saprolite, due to leaching as a result of bisiallitisation and monosiallitisation. This is accompanied by a progressive ferruginization of materials, confirmed by the densification under the microscope of goethitic brown veil from the base to the loamy clay horizon and the increase in iron contents from the bedrock to the humiferous surface horizon.

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Section: Methodsmentioning

confidence: 99%

Genesis and classification of soils developed on gabbro in the high reliefs of Maroua region, North Cameroon

Tsozué

Nzeukou

Azinwi

2017

Eurasian Journal of Soil Science (Ejss)

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“…The sesquioxide content (SOC) reflects the Fe2O3 and Al2O3 content in a sample which are insoluble oxides (Irfan, 1996). An increase of SOC indicates either a higher intensity of leaching or oxidation resulting from the enrichment of ferric iron from the oxidation of ferrous iron (Ng et al, 2001).…”

Section: Evaluation Of Weathering Intensitymentioning

confidence: 99%

Tropical chemical weathering of a garnet rich micaschist in the rainforest zone of Cameroon

Tsozué

Yongue-Fouateu

2017

Eurasian Journal of Soil Science (Ejss)

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Article Info Received : 22.03.2016 Accepted : 17.05.2016 Soils developed on garnet-rich micaschist in the Southern Cameroon plateau were investigated. Morphologically, two weathering materials constituted the study profile, fine earth and nodules. Each material has a singular evolution from the coarse saprolite to the upper set of clayey and loose horizons. There is Al2O3 enrichment in the fine earth concomitantly to Fe2O3, Na2O and K2O enrichment in nodules in major elementAl2O3 variation diagrams. A-CN-K and A-CNK-FM diagrams show a progressive depletion of Al in nodules concomitantly to an enrichment of this element in the fine earth. Three pedogenetic processes emerge from the evolution of weathering products. There is a ferruginization process whose importance increases from the coarse saprolite to the upper set of clayey and loose horizons, giving rise to the formation of dense nodules composed of hematite, goethite and gibbsite. This ferruginization occurs concomitantly with a desaluminization process, which causes Al2O3 depletion in nodules. These nodules are formed by the process of induration where the hydrated amorphous hydroxide and oxides are dehydrated to their crystalline oxide form, due to condensation. In addition, there is aluminization, which occurs in the fine earth, leading to the development of a red clayey material composed of kaolinite and gibbsite.

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“…(Irfan, 1996)와도 부합한다. 이곳 포천과 양 주지역 흑운모화강암류는 공극률 대 비중의 관계도에 서 비교적 완만한 부의 경향 (Tugrul and Zarif, 1998) 을 보이는 편이다 (Fig.…”

Section: 물성 및 상호관계 비중 흡수율과 공극률 암석자원에서 비중(Sg) 흡수율(Ar)과 공극률(Pr)unclassified

Applied Petrologic Study of the Daebo Biotite Granites in the mid Gyeonggi Massif

Yun¹,

Hong²,

Park³

et al. 2012

The Journal of the Petrological Society of Korea

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Jurassic Daebo biotite granites, known as one of the main stone resources in the country, are widely and away distributed in the Pocheon and Yangju areas of the mid Gyeonggi massif. The objects of the study are mainly to reveal the unique characteristics of grain size, rock color, mineral composition, physical property and fracture system from the above biotite granites. Biotite granites from the Pocheon area (PG) and Yangju area (YG) are represented by coarse-grained and light gray, and medium to coarsegrained and grayish to light gray, respectively. In modes, main minerals of Qz+Af+Pl (quartz+alkali feldspar+plagioclase) are more increased in the PG, and accessories of biotite are more increased in the YG, which differences can cause the PG more bright light gray than the YG. Specific gravity (SG) shows

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Mineralogy, fabric properties and classification of weathered granites in Hong Kong

Cited by 205 publications

References 28 publications

Genesis and classification of soils developed on gabbro in the high reliefs of Maroua region, North Cameroon

Genesis and classification of soils developed on gabbro in the high reliefs of Maroua region, North Cameroon

Tropical chemical weathering of a garnet rich micaschist in the rainforest zone of Cameroon

Applied Petrologic Study of the Daebo Biotite Granites in the mid Gyeonggi Massif

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