Weathering sequences of clay minerals in soils along a serpentinitic toposequence

Z. Y. Hseu, Heng Tsai, H. C. Hsi, Y. C. Chen

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

There has been limited research on clay mineral transformation in serpentinitic soils under humid tropical conditions. In this study, four soil pedons were selected along a toposequence from the summit (Entisol), shoulder (Vertisol), backslope (Alfisol) to footslope (Ultisol) positions to explore the contributions and the significance of landscape and weathering status of serpentinitic rock with regard to clay mineral transformations in eastern Taiwan. Experimental results indicated that the large amount of dithionite-citrate-bicarbonate-extractable Fe (Fed) and clay in the subsurface horizon were mainly caused by the strong leaching potential from intensive rainfall and weathering of the fine-grained parent rocks. The clay mineralogy reflected the clear weathering trend of the soils along the toposequence: (1) the soils on the summit and shoulder contained smectite and serpentine, which are predominant in the young soils derived from serpentinitic rocks; and (2) vermiculite gradually increased in the relatively old soils on backslope and footstope. The mineralogical transformations observed along the toposequence indicated that chlorite and serpentine, initially present in the Entisol on the summit, weather into smectite and interstratified chlorite-vermiculite in the intermediate soil on the shoulder under strong leaching and oxidizing conditions. Furthermore, vermiculite formed as the major weathering product of chlorite and smectite in the soil developed on the backslope. In addition to vermiculite, kaolinite and quartz formed in the soils on the footslope with the greatest concentration of Fed along the toposequence.

Original languageEnglish
Pages (from-to)389-401
Number of pages13
JournalClays and Clay Minerals
Volume55
Issue number4
DOIs
Publication statusPublished - 2007 Aug 1

Fingerprint

weathering sequences
toposequence
toposequences
clay minerals
Weathering
Clay minerals
clay soils
mineral soils
clay mineral
weathering
Soils
vermiculite
soil
chlorite (mineral)
smectite
shoulders
chlorite
Entisol
Entisols
Rocks

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)

Cite this

Hseu, Z. Y. ; Tsai, Heng ; Hsi, H. C. ; Chen, Y. C. / Weathering sequences of clay minerals in soils along a serpentinitic toposequence. In: Clays and Clay Minerals. 2007 ; Vol. 55, No. 4. pp. 389-401.
@article{9ad161568949445abe07d26a90bb0cfd,
title = "Weathering sequences of clay minerals in soils along a serpentinitic toposequence",
abstract = "There has been limited research on clay mineral transformation in serpentinitic soils under humid tropical conditions. In this study, four soil pedons were selected along a toposequence from the summit (Entisol), shoulder (Vertisol), backslope (Alfisol) to footslope (Ultisol) positions to explore the contributions and the significance of landscape and weathering status of serpentinitic rock with regard to clay mineral transformations in eastern Taiwan. Experimental results indicated that the large amount of dithionite-citrate-bicarbonate-extractable Fe (Fed) and clay in the subsurface horizon were mainly caused by the strong leaching potential from intensive rainfall and weathering of the fine-grained parent rocks. The clay mineralogy reflected the clear weathering trend of the soils along the toposequence: (1) the soils on the summit and shoulder contained smectite and serpentine, which are predominant in the young soils derived from serpentinitic rocks; and (2) vermiculite gradually increased in the relatively old soils on backslope and footstope. The mineralogical transformations observed along the toposequence indicated that chlorite and serpentine, initially present in the Entisol on the summit, weather into smectite and interstratified chlorite-vermiculite in the intermediate soil on the shoulder under strong leaching and oxidizing conditions. Furthermore, vermiculite formed as the major weathering product of chlorite and smectite in the soil developed on the backslope. In addition to vermiculite, kaolinite and quartz formed in the soils on the footslope with the greatest concentration of Fed along the toposequence.",
author = "Hseu, {Z. Y.} and Heng Tsai and Hsi, {H. C.} and Chen, {Y. C.}",
year = "2007",
month = "8",
day = "1",
doi = "10.1346/CCMN.2007.0550407",
language = "English",
volume = "55",
pages = "389--401",
journal = "Clays and Clay Minerals",
issn = "0009-8604",
publisher = "Clay Minerals Society",
number = "4",

}

Weathering sequences of clay minerals in soils along a serpentinitic toposequence. / Hseu, Z. Y.; Tsai, Heng; Hsi, H. C.; Chen, Y. C.

In: Clays and Clay Minerals, Vol. 55, No. 4, 01.08.2007, p. 389-401.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Weathering sequences of clay minerals in soils along a serpentinitic toposequence

AU - Hseu, Z. Y.

AU - Tsai, Heng

AU - Hsi, H. C.

AU - Chen, Y. C.

PY - 2007/8/1

Y1 - 2007/8/1

N2 - There has been limited research on clay mineral transformation in serpentinitic soils under humid tropical conditions. In this study, four soil pedons were selected along a toposequence from the summit (Entisol), shoulder (Vertisol), backslope (Alfisol) to footslope (Ultisol) positions to explore the contributions and the significance of landscape and weathering status of serpentinitic rock with regard to clay mineral transformations in eastern Taiwan. Experimental results indicated that the large amount of dithionite-citrate-bicarbonate-extractable Fe (Fed) and clay in the subsurface horizon were mainly caused by the strong leaching potential from intensive rainfall and weathering of the fine-grained parent rocks. The clay mineralogy reflected the clear weathering trend of the soils along the toposequence: (1) the soils on the summit and shoulder contained smectite and serpentine, which are predominant in the young soils derived from serpentinitic rocks; and (2) vermiculite gradually increased in the relatively old soils on backslope and footstope. The mineralogical transformations observed along the toposequence indicated that chlorite and serpentine, initially present in the Entisol on the summit, weather into smectite and interstratified chlorite-vermiculite in the intermediate soil on the shoulder under strong leaching and oxidizing conditions. Furthermore, vermiculite formed as the major weathering product of chlorite and smectite in the soil developed on the backslope. In addition to vermiculite, kaolinite and quartz formed in the soils on the footslope with the greatest concentration of Fed along the toposequence.

AB - There has been limited research on clay mineral transformation in serpentinitic soils under humid tropical conditions. In this study, four soil pedons were selected along a toposequence from the summit (Entisol), shoulder (Vertisol), backslope (Alfisol) to footslope (Ultisol) positions to explore the contributions and the significance of landscape and weathering status of serpentinitic rock with regard to clay mineral transformations in eastern Taiwan. Experimental results indicated that the large amount of dithionite-citrate-bicarbonate-extractable Fe (Fed) and clay in the subsurface horizon were mainly caused by the strong leaching potential from intensive rainfall and weathering of the fine-grained parent rocks. The clay mineralogy reflected the clear weathering trend of the soils along the toposequence: (1) the soils on the summit and shoulder contained smectite and serpentine, which are predominant in the young soils derived from serpentinitic rocks; and (2) vermiculite gradually increased in the relatively old soils on backslope and footstope. The mineralogical transformations observed along the toposequence indicated that chlorite and serpentine, initially present in the Entisol on the summit, weather into smectite and interstratified chlorite-vermiculite in the intermediate soil on the shoulder under strong leaching and oxidizing conditions. Furthermore, vermiculite formed as the major weathering product of chlorite and smectite in the soil developed on the backslope. In addition to vermiculite, kaolinite and quartz formed in the soils on the footslope with the greatest concentration of Fed along the toposequence.

UR - http://www.scopus.com/inward/record.url?scp=34848819984&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34848819984&partnerID=8YFLogxK

U2 - 10.1346/CCMN.2007.0550407

DO - 10.1346/CCMN.2007.0550407

M3 - Article

AN - SCOPUS:34848819984

VL - 55

SP - 389

EP - 401

JO - Clays and Clay Minerals

JF - Clays and Clay Minerals

SN - 0009-8604

IS - 4

ER -