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Red soils developed from Quaternary deposits on the Linkuo terrace, northern Taiwan

Ping Hua Shao, Kai-Shuan Shea, Ming Kuang Wang, Yen-Hong Shau, Kai Yin Chiang and Tsung Ming Tsao
Red soils developed from Quaternary deposits on the Linkuo terrace, northern Taiwan
Clay Minerals (September 2010) 45 (3): 371-382


The Linkuo terrace, situated to the west of the Taipei Basin in NW Taiwan, has thick red soils that have been little studied. This paper aims to interpret the development of these soils through chemical and micromorphological investigations, and relate the soils to their palaeo-environments. The soil samples were air dried, crushed and passed through a 2 mm sieve, and then subjected to conventional soil chemical and physical analyses, together with clay mineralogical and morphological characterization. Pedons I and II were clay with low base saturation (BS), cation-exchange capacity (CEC), and exchangeable cations. The pH of pedons I and II ranged from 3.80 to 5.26. The low magnetic susceptibility of these soils indicates that no magnetite (Fe (sub 3) O (sub 4) ) or maghemite (gamma -Fe (sub 2) O (sub 3) ) are present. X-ray diffraction patterns of the magnetic clay fraction showed lepidocrocite, goethite and hematite, the amounts of which may relate to water fluctuation in the soil environments. Illite, kaolinite and quartz are major clay minerals in the red soil clay fractions. The micromorphology of all horizons showed a great accumulation of Fe-oxides. The upper horizon showed darkened isotropic Fe-oxide materials, and lower horizon showed a black to reddish dense plasma with soil matrix. The groundmass of the oxic horizon is generally characterized by a homogeneous distribution of the different coarse and fine constituents. The thick (4 m depth) and homogeneous red soils of the Linkuo terrace were developed from fine sediments after the gradual subsidence of the Taipei Basin. A large amount of gravel was flushed from the Xindian River before the Taipei Basin subsided. The Linkuo red soils can be classified as mesic, Typic Kandiudox. From the chemical compositions of clay fractions and the red soil features, these red soils can be considered as lateritic red earths or red earths that do not reach the criteria for laterite.

ISSN: 0009-8558
EISSN: 1471-8030
Serial Title: Clay Minerals
Serial Volume: 45
Serial Issue: 3
Title: Red soils developed from Quaternary deposits on the Linkuo terrace, northern Taiwan
Affiliation: Central Geological Survey, Taipei, Taiwan
Pages: 371-382
Published: 201009
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 38
Accession Number: 2010-090882
Categories: Sedimentary petrologySoils
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 plate, 4 tables, sketch map
N25°00'00" - N25°10'00", E121°15'00" - E121°25'00"
Secondary Affiliation: National Taiwan University, TWN, TaiwanNational Sun Yat-Sen University, TWN, Taiwan
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201048
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